Control Method, Control Device, Storage Medium and Vehicle for Sequential Turbocharging System

Abstract

The present application provides a control method, a control device, a storage medium and a vehicle for a sequential supercharging system. The method includes: generating a plurality of change curve groups, where one change curve group includes a first change curve and a second change curve; controlling the opening of the exhaust valve and the intake valve according to each change curve group to make the sequential supercharging system enter the cut-in state, and obtaining a plurality of maximum engine speed fluctuation amounts, instantaneous fuel consumption rates, and smoke densities; comprehensively evaluating according to the maximum engine speed fluctuation amounts, instantaneous fuel consumption rates, and smoke densities to determine a first target change curve and a second target change curve; controlling the exhaust valve to open according to the first target change curve, and controlling the intake valve to open according to the second target change curve. This method solves the problems of large engine speed fluctuations, high fuel consumption, and large soot during the transient switching process in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of engine control, and in particular, to a control method, a control device, a storage medium, and a vehicle for a sequential supercharging system. Background Art

[0002] Recently, high-power diesel engines have been continuously developing towards high supercharging, high power density, wide speed range, and low emissions. The matching contradiction between the engine and the supercharging system has become increasingly prominent, especially in the low-speed and low-load operating range. The sequential supercharging technology can enable the supercharging system to achieve good matching with the engine in a relatively wide operating range, and is considered to be one of the most critical technical measures to improve the performance of high-supercharged diesel engines.

[0003] Sequential supercharging means that a supercharging system is composed of two or more controlled turbochargers connected in parallel. As the speed and load of the supercharged engine increase, they are put into operation sequentially in order. The sequential supercharging system involves the closing and opening of electronically controlled exhaust valves and electronically controlled intake valves. As Figure 1 shown, the currently known control method is that when the controlled supercharger 1 meets the cut-in condition, the set opening of the exhaust control valve 100 is directly given, and the exhaust control valve opens according to the unique response characteristics of the motor. The intake control valve adopts the same control method as the exhaust control valve. When sequential supercharging is performed using the above control method, during the transient switching process, the intake pressure decreases, and the intake air flow after intercooling decreases, resulting in poor combustion and large fluctuations in the engine speed. At the same time, in order to stabilize the engine speed, the engine needs to increase fuel injection, resulting in increased fuel consumption, further deterioration of combustion, and increased soot. Summary of the Invention

[0004] The main object of the present application is to provide a control method, a control device, a storage medium, and a vehicle for a sequential supercharging system, so as to at least solve the problems of large fluctuations in engine speed, high fuel consumption, and large soot during the transient switching process in the prior art.

[0005] To achieve the above object, according to one aspect of the present application, a control method for a sequential supercharging system is provided. The control method includes: generating a plurality of groups of change curves, where one group of change curves includes a first change curve and a second change curve. The first change curve is a change curve of the opening degree of the exhaust valve of the controlled supercharger changing with time, and the second change curve is a change curve of the opening degree of the intake valve of the controlled supercharger changing with time; controlling the opening of the exhaust valve and the intake valve according to each group of change curves to make the sequential supercharging system enter the cut-in state, and obtaining a plurality of maximum rotational speed fluctuation amounts, instantaneous fuel consumption rates, and smoke densities of the engine. The maximum rotational speed fluctuation amount corresponds to one group of change curves, the instantaneous fuel consumption rate corresponds to one group of change curves, and the smoke density corresponds to one group of change curves. The cut-in state is the state of the sequential supercharging system during the process from the moment when both the exhaust valve and the intake valve are opened until the moment when both the exhaust valve and the intake valve reach the maximum opening degree. The maximum rotational speed fluctuation amount is the maximum value of the difference between the rotational speed of the engine in the cut-in state and the rotational speed of the engine before sequential supercharging. The instantaneous fuel consumption rate is the instantaneous fuel consumption rate of the engine in the cut-in state, and the smoke density is the amount of soot discharged by the engine in the cut-in state; comprehensively evaluating according to the maximum rotational speed fluctuation amount, instantaneous fuel consumption rate, and smoke density to determine a first target change curve and a second target change curve. The first target change curve is the first change curve corresponding to the minimum maximum rotational speed fluctuation amount, the instantaneous fuel consumption rate being within a first predetermined range, and the smoke density being within a second predetermined range. The second target change curve is the second change curve corresponding to the minimum maximum rotational speed fluctuation amount, the instantaneous fuel consumption rate being within a first predetermined range, and the smoke density being within a second predetermined range; controlling the exhaust valve to open according to the first target change curve and controlling the intake valve to open according to the second target change curve.

[0006] Optionally, controlling the opening of the exhaust valve and the intake valve according to each group of change curves to make the sequential supercharging system enter the cut-in state, and obtaining the plurality of maximum rotational speed fluctuation amounts, instantaneous fuel consumption rates, and smoke densities of the engine includes: a first control step of controlling the opening of the exhaust valve according to the first change curve and controlling the opening of the intake valve according to the second change curve to make the sequential supercharging system enter the cut-in state; a first obtaining step of obtaining the maximum rotational speed fluctuation amount, instantaneous fuel consumption rate, and smoke density when the sequential supercharging system is in the cut-in state; repeating the control step and the obtaining step at least once in sequence until the maximum rotational speed fluctuation amounts, instantaneous fuel consumption rates, and smoke densities corresponding to all the groups of change curves are obtained.

[0007] Optionally, before controlling the exhaust valve to open according to the first target change curve and controlling the intake valve to open according to the second target change curve, the method further includes: obtaining a first response duration and a second response duration, where the first response duration is the duration consumed for the exhaust valve to open according to the first target change curve, and the second response duration is the duration consumed for the intake valve to open according to the second target change curve; generating a first response duration set according to the first response duration, and generating a second response duration set according to the second response duration, where the ratio of the response durations in the first response duration set to the first response duration is within a third predetermined range, and the ratio of the response durations in the second response duration set to the second response duration is within a fourth predetermined range; generating a plurality of response duration groups according to the first response duration set and the second response duration set, where one response duration group includes a first response duration and a second response duration; controlling the exhaust valve and the intake valve to open according to each of the response duration groups, so that the sequential supercharging system enters the cut-in state, and obtaining a plurality of maximum engine speed fluctuation amounts, instantaneous fuel consumption rates, and smoke degrees of the engine, where the maximum engine speed fluctuation amount corresponds to the response duration group one by one, the instantaneous fuel consumption rate corresponds to the response duration group one by one, and the smoke degree corresponds to the response duration group one by one; determining a first target response duration and a second target response duration according to the maximum engine speed fluctuation amount, instantaneous fuel consumption rate, and smoke degree, where the first target response duration is the first response duration corresponding to the minimum maximum engine speed fluctuation amount, the instantaneous fuel consumption rate within a fifth predetermined range, and the smoke degree within a sixth predetermined range, and the second target response duration is the second response duration corresponding to the minimum maximum engine speed fluctuation amount, the instantaneous fuel consumption rate within a fifth predetermined range, and the smoke degree within a sixth predetermined range.

[0008] Optionally, controlling the exhaust valve and the intake valve to open according to each of the response duration groups, so that the sequential supercharging system enters the cut-in state, and obtaining a plurality of maximum engine speed fluctuation amounts, instantaneous fuel consumption rates, and smoke degrees of the engine includes: a second control step of controlling the exhaust valve to open according to the first response duration of the target response duration group and controlling the intake valve to open according to the second response duration of the target response duration group, so that the sequential supercharging system enters the cut-in state; a first obtaining step of obtaining the maximum engine speed fluctuation amount, instantaneous fuel consumption rate, and smoke degree when the sequential supercharging system is in the cut-in state; repeating the control step and the obtaining step at least once in sequence until the maximum engine speed fluctuation amounts, instantaneous fuel consumption rates, and smoke degrees corresponding to all the response duration groups are obtained.

[0009] Optionally, controlling the exhaust valve to open according to the first target change curve and controlling the intake valve to open according to the second target change curve includes: correcting the first target change curve according to the first target response duration to obtain a first corrected change curve, where the response duration of the first corrected change curve is the first target response duration; correcting the second target change curve according to the second target response duration to obtain a second corrected change curve, where the response duration of the second corrected change curve is the second target response duration; controlling the exhaust valve to open according to the first corrected change curve and controlling the intake valve to open according to the second corrected change curve.

[0010] Optionally, before controlling the exhaust valve to open according to the first target change curve and controlling the intake valve to open according to the second target change curve, the method further includes: obtaining a first correction coefficient, a second correction coefficient, and an original delay duration, where the first correction coefficient is the coefficient corresponding to the first target response duration, the second correction coefficient is the coefficient corresponding to the second target response duration, the original delay duration is the time interval between the opening time of the exhaust valve and the opening time of the intake valve, and the first correction coefficient and the second correction coefficient are obtained from a calibration experiment; calculating a corrected delay duration according to the first correction coefficient and the first target response duration, the second correction coefficient and the second target response duration, and the original delay duration; controlling the intake valve to open at a target time, where the target time is a time after the opening time of the exhaust valve and is separated from the opening time by the corrected delay duration.

[0011] Optionally, controlling the intake valve to open according to the second target change curve includes: controlling the air intake valve to open after the gas intake valve opens.

[0012] According to another aspect of the present application, a control device for a sequential supercharging system is provided. The control device includes: a first generating unit configured to generate a plurality of groups of change curves. One group of change curves includes a first change curve and a second change curve. The first change curve is a change curve of the opening degree of the exhaust valve of the controlled supercharger changing with time, and the second change curve is a change curve of the opening degree of the intake valve of the controlled supercharger changing with time; a first obtaining unit configured to control the exhaust valve and the intake valve to open according to each group of change curves, so that the sequential supercharging system enters a cut-in state, and obtain a plurality of maximum engine speed fluctuation amounts, instantaneous fuel consumption rates, and smoke densities of the engine. The maximum engine speed fluctuation amounts correspond to the groups of change curves one by one, the instantaneous fuel consumption rates correspond to the groups of change curves one by one, and the smoke densities correspond to the groups of change curves one by one. The cut-in state is the state of the sequential supercharging system during the process from when both the exhaust valve and the intake valve are in the open state until they reach the maximum opening degree. The maximum engine speed fluctuation amount is the maximum value of the difference between the engine speed in the cut-in state and the engine speed before sequential supercharging. The instantaneous fuel consumption rate is the instantaneous fuel consumption rate of the engine in the cut-in state. The smoke density is the amount of soot discharged by the engine in the cut-in state; a first determining unit configured to comprehensively evaluate according to the maximum engine speed fluctuation amount, instantaneous fuel consumption rate, and smoke density, and determine a first target change curve and a second target change curve. The first target change curve is the first change curve corresponding to the minimum maximum engine speed fluctuation amount, the instantaneous fuel consumption rate being within a first predetermined range, and the smoke density being within a second predetermined range. The second target change curve is the second change curve corresponding to the minimum maximum engine speed fluctuation amount, the instantaneous fuel consumption rate being within a first predetermined range, and the smoke density being within a second predetermined range; a first control unit configured to control the exhaust valve to open according to the first target change curve and control the intake valve to open according to the second target change curve.

[0013] According to still another aspect of the present application, a computer-readable storage medium is provided. The computer-readable storage medium includes a stored program. When the program runs, it controls the device where the computer-readable storage medium is located to execute any one of the above methods.

[0014] According to yet another aspect of the present application, a vehicle is provided, including: an engine, one or more processors, a memory, and one or more programs. The engine includes a sequential supercharging system. The sequential supercharging system includes a plurality of parallel controlled superchargers. The controlled supercharger includes an exhaust control valve and an intake control valve. The one or more programs are stored in the memory and are configured to be executed by the one or more processors. The one or more programs include those for executing any one of the above methods.

[0015] Applying the technical solution of the present application, in the control method of the above sequential supercharging system, first, a plurality of change curve groups are generated. One of the above change curve groups includes a first change curve and a second change curve. The above first change curve is a change curve of the opening degree of the exhaust valve of the above controlled supercharger changing with time, and the above second change curve is a change curve of the opening degree of the intake valve of the above controlled supercharger changing with time. Then, according to each of the above change curve groups, the exhaust valve and the intake valve are controlled to open, so that the sequential supercharging system enters the cut-in state, and a plurality of maximum engine speed fluctuation amounts, instantaneous fuel consumption rates, and smoke densities of the above engine are obtained. The above maximum engine speed fluctuation amount corresponds to the above change curve group one by one, the above instantaneous fuel consumption rate corresponds to the above change curve group one by one, and the above smoke density corresponds to the above change curve group one by one. The above cut-in state is the state in which the sequential supercharging system is located during the process from the moment when both the exhaust valve and the intake valve are opened until the moment when both the exhaust valve and the intake valve reach the maximum opening degree. The above maximum engine speed fluctuation amount is the maximum value of the difference between the engine speed in the cut-in state and the engine speed before sequential supercharging. The above instantaneous fuel consumption rate is the instantaneous fuel consumption rate of the engine in the cut-in state, and the above smoke density is the amount of soot discharged by the engine in the cut-in state. After that, according to the comprehensive evaluation of the above maximum engine speed fluctuation amount, instantaneous fuel consumption rate, and smoke density, a first target change curve and a second target change curve are determined. The above first target change curve is the first change curve corresponding to the minimum maximum engine speed fluctuation amount, the instantaneous fuel consumption rate being within a first predetermined range, and the smoke density being within a second predetermined range. The above second target change curve is the second change curve corresponding to the minimum maximum engine speed fluctuation amount, the instantaneous fuel consumption rate being within a first predetermined range, and the smoke density being within a second predetermined range. Finally, the exhaust valve is controlled to open according to the above first target change curve, and the intake valve is controlled to open according to the above second target change curve. This method realizes the flexible opening of the control valve with a variable slope of the opening degree by calibrating the opening degree change curve during the opening process of the exhaust control valve and the intake control valve, achieves the effect of reducing the supercharging pressure loss during the transient switching process and reducing the impact on the engine, and solves the problem of large engine speed fluctuations during the transient switching process in the prior art. Description of the Drawings

[0016] Figure 1 Shows the opening degree change curves of the exhaust valve and the intake valve of the sequential supercharging system in the prior art with respect to time;

[0017] Figure 2 Shows the hardware structure block diagram of a mobile terminal for implementing the control method of the sequential supercharging system according to an embodiment of the present application;

[0018] Figure 3The figure shows a schematic flowchart of a control method for a sequential supercharging system provided according to an embodiment of the present application;

[0019] Figure 4 The figure shows one of the opening change curves of the set exhaust valve and intake valve with time provided according to an embodiment of the present application;

[0020] Figure 5 The figure shows four opening change curves of the set exhaust valve and intake valve with time provided according to an embodiment of the present application;

[0021] Figure 6 The figure shows a flowchart of a control method for a sequential supercharging system provided according to another embodiment of the present application;

[0022] Figure 7 The figure shows a structural block diagram of a control device for a sequential supercharging system provided according to an embodiment of the present application;

[0023] Figure 8 The figure shows a structural diagram of a sequential supercharging system provided according to an embodiment of the present application;

[0024] The above figures include the following reference numerals:

[0025] 1. Engine; 2. Exhaust side; 3. Intake side; 4. First controlled supercharger; 5. First basic supercharger; 6. Second basic supercharger; 7. Second controlled supercharger; 8. Intake valve; 9. Exhaust valve; 10. Air filter. Detailed implementation manners

[0026] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0027] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0028] It should be noted that the terms "first", "second", etc. in the description, claims and the above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so as to implement the embodiments of the present application described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0029] As introduced in the background art, in the prior art during the transient switching process, the intake pressure decreases, and the intake air flow after the intercooler decreases, resulting in poor combustion and large fluctuations in the engine speed. At the same time, in order to stabilize the engine speed, the engine needs to increase fuel injection, resulting in increased fuel consumption, further deterioration of combustion, and aggravation of soot. To solve the problem of large fluctuations in the engine speed during the transient switching process in the prior art, the embodiments of the present application provide a control method, a control device, a storage medium, and a vehicle for a sequential supercharging system.

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0031] The method embodiments provided in the embodiments of the present application can be executed on a mobile terminal, a computer terminal, or a similar computing device. Taking running on a mobile terminal as an example, Figure 2 is a hardware structure block diagram of a mobile terminal of a control method for a sequential supercharging system according to an embodiment of the present invention. As Figure 2 shown, the mobile terminal may include one or more ( Figure 2 only one is shown in Figure 2 a processor 102 (the processor 102 may include, but is not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data. Among them, the above-mentioned mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those of ordinary skill in the art can understand that Figure 2 the structure shown in Figure 2 is only schematic and does not limit the structure of the above-mentioned mobile terminal. For example, the mobile terminal may further include more or fewer components than

[0032] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the display method of device information in the embodiments of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, the above-mentioned method is implemented. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some instances, the memory 104 may further include a memory remotely disposed relative to the processor 102, and these remote memories may be connected to the mobile terminal through a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the above-mentioned network may include a wireless network provided by a communication provider of the mobile terminal. In one instance, the transmission device 106 includes a network adapter (Network Interface Controller, abbreviated as NIC), which can be connected to other network devices through a base station and thus communicate with the Internet. In one instance, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0033] In this embodiment, a control method for a sequential supercharging system operating on a mobile terminal, a computer terminal, or a similar computing device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0034] Figure 3 It is a flowchart of the control method for the sequential supercharging system according to the embodiments of the present application. As Figure 3 shown, the method includes the following steps:

[0035] Step S201, generating a plurality of change curve groups. One of the above change curve groups includes a first change curve and a second change curve. The first change curve is a change curve of the opening degree of the exhaust valve of the controlled supercharger changing with time, and the second change curve is a change curve of the opening degree of the intake valve of the controlled supercharger changing with time;

[0036] Specifically, in the prior art, during the sequential supercharging process, the intake valve and the exhaust valve are controlled by a motor and open according to the unique response characteristics of the motor, that is, they open uniformly until the opening degree reaches 100. As Figure 4As shown, the present application makes changes to the opening processes of the above exhaust valve and the above intake valve, and respectively sets curves of the opening degrees of the above exhaust valve and the above intake valve changing with time. However, setting only one opening degree change curve cannot obtain the best control method for the control effect. Therefore, as Figure 5 shown, multiple opening degree change curves are set, and the optimal curve is selected from them through experiments. Since the pressure in the cylinder during the sequential supercharging process is affected by both the opening degree of the exhaust valve and the opening degree of the intake valve, there should be corresponding opening degree change curves of the above exhaust valve and the above intake valve in one experimental group.

[0037] Step S202: Control the opening of the above exhaust valve and the above intake valve according to each of the above change curve groups, so that the above sequential supercharging system enters the cut-in state, and obtain multiple maximum rotational speed fluctuations, instantaneous fuel consumption rates, and smoke densities of the above engine. The above maximum rotational speed fluctuations correspond one-to-one with the above change curve groups, the above instantaneous fuel consumption rates correspond one-to-one with the above change curve groups, the above smoke densities correspond one-to-one with the above change curve groups. The above cut-in state is the state of the above sequential supercharging system during the process from the moment when both the above exhaust valve and the above intake valve are opened until the moment when both the above exhaust valve and the above intake valve reach the maximum opening degree. The above maximum rotational speed fluctuation is the maximum value of the difference between the rotational speed of the engine in the cut-in state and the rotational speed of the engine before sequential supercharging. The above instantaneous fuel consumption rate is the instantaneous fuel consumption rate of the engine in the cut-in state. The above smoke density is the amount of soot discharged by the engine in the cut-in state;

[0038] Specifically, during the transient switching process of sequential supercharging, the intake pressure decreases, and the intake air flow after intercooling decreases, resulting in poor combustion and large fluctuations in the engine speed. At the same time, in order to stabilize the engine speed, the engine needs to increase fuel injection, resulting in increased fuel consumption and further deterioration of combustion and increased soot. The most fundamental reason is the decrease in pressure in the cylinder, which leads to fluctuations in the engine speed. Therefore, the above maximum rotational speed fluctuations, instantaneous fuel consumption rates, and engine emission smoke density information are used as indicators to measure the control effect of the above change curve groups. Controlling the opening of the above exhaust valve and the above intake valve flexibly according to the above change curve groups can obtain the maximum rotational speed fluctuation, instantaneous fuel consumption rate, and smoke density corresponding to each group of control methods. Measure the maximum rotational speed fluctuation, instantaneous fuel consumption rate, and smoke density for each group of change curves. Therefore, each maximum rotational speed fluctuation, instantaneous fuel consumption rate, or smoke density has a unique corresponding above change curve group.

[0039] Step S203: Based on the comprehensive evaluation of the above maximum rotational speed fluctuation, instantaneous fuel consumption rate, and smoke density, determine the first target change curve and the second target change curve. The first target change curve is the first change curve corresponding to the minimum maximum rotational speed fluctuation, the instantaneous fuel consumption rate within the first predetermined range, and the smoke density within the second predetermined range. The second target change curve is the second change curve corresponding to the minimum maximum rotational speed fluctuation, the instantaneous fuel consumption rate within the first predetermined range, and the smoke density within the second predetermined range.

[0040] Specifically, compare the maximum rotational speed fluctuation, instantaneous fuel consumption rate, and smoke density corresponding to each of the above change curve groups. Take the maximum rotational speed fluctuation as the most important indicator, and the instantaneous fuel consumption rate and smoke density as secondary indicators. Then, a change curve group can be obtained that minimizes the maximum fluctuation, keeps the instantaneous fuel consumption rate within the first predetermined range, and keeps the smoke density within the second predetermined range. Thus, the exhaust valve opening change curve and the intake valve change curve that minimize the cylinder pressure change during the sequential supercharging process are obtained, that is, the exhaust valve opening change curve and the intake valve change curve with the optimal control effect, obtaining the first target change curve and the second target change curve.

[0041] Among them, in theory, the change curve group that minimizes the maximum rotational speed fluctuation, the instantaneous fuel consumption rate, and the smoke amount should be selected. However, in the actual experimental process, the instantaneous fuel consumption rate and smoke density are affected not only by the engine speed fluctuation. It is difficult to obtain a change curve group where the three parameters are simultaneously minimized. Therefore, the first predetermined range and the second predetermined range are set. When the maximum fluctuation is the smallest and the instantaneous fuel consumption rate is within the first predetermined range and the smoke density is within the second predetermined range, the corresponding curve is determined as the change curve with the optimal control effect.

[0042] In another embodiment of the present application, for the above maximum fluctuation, instantaneous fuel consumption rate, and smoke density, look up the table according to the monitored parameters to obtain the corresponding parameter scores, and then multiply each score parameter by the corresponding weight to obtain the corresponding score of the above change curve. Select the change curve with the highest score as the target change curve. The above parameter scores and weights are obtained from the calibration experiment.

[0043] Step S204: Control the exhaust valve to open according to the first target change curve, and control the intake valve to open according to the second target change curve.

[0044] Specifically, the above-mentioned optimal exhaust valve opening change curve and the above-mentioned optimal intake valve change curve together constitute the optimal control method for the flexible opening of the sequential supercharging process control valve. By controlling the opening of the above-mentioned exhaust valve and the above-mentioned intake valve according to the above-mentioned control method, the optimal sequential supercharging effect can be obtained.

[0045] Through the above embodiments, first, a plurality of change curve groups are generated. One of the above change curve groups includes a first change curve and a second change curve. The first change curve is the change curve of the opening of the exhaust valve of the controlled supercharger with respect to time, and the second change curve is the change curve of the opening of the intake valve of the controlled supercharger with respect to time. Then, according to each of the above change curve groups, the exhaust valve and the intake valve are controlled to open, so that the sequential supercharging system enters the cut-in state, and a plurality of maximum engine speed fluctuation amounts, instantaneous fuel consumption rates, and smoke densities of the engine are obtained. The maximum engine speed fluctuation amount corresponds to the change curve group one by one, the instantaneous fuel consumption rate corresponds to the change curve group one by one, and the smoke density corresponds to the change curve group one by one. The cut-in state is the state of the sequential supercharging system during the process from the moment when both the exhaust valve and the intake valve are opened until the moment when both the exhaust valve and the intake valve reach the maximum opening. The maximum engine speed fluctuation amount is the maximum value of the difference between the engine speed in the cut-in state and the engine speed before sequential supercharging. The instantaneous fuel consumption rate is the instantaneous fuel consumption rate of the engine in the cut-in state, and the smoke density is the amount of soot discharged by the engine in the cut-in state. After that, through comprehensive evaluation of the above-mentioned maximum engine speed fluctuation amount, instantaneous fuel consumption rate, and smoke density, a first target change curve and a second target change curve are determined. The first target change curve is the first change curve corresponding to the minimum maximum engine speed fluctuation amount, the instantaneous fuel consumption rate being within a first predetermined range, and the smoke density being within a second predetermined range. The second target change curve is the second change curve corresponding to the minimum maximum engine speed fluctuation amount, the instantaneous fuel consumption rate being within a first predetermined range, and the smoke density being within a second predetermined range. Finally, the exhaust valve is controlled to open according to the first target change curve, and the intake valve is controlled to open according to the second target change curve. This method calibrates the opening change curve during the opening process of the exhaust control valve and the intake control valve, realizes the flexible opening of the control valve with a variable slope of the opening, achieves the effect of reducing the supercharging pressure loss during the transient switching process and reducing the impact on the engine, and solves the problem of large engine speed fluctuations during the transient switching process in the prior art.

[0046] In order to obtain the maximum engine speed fluctuation corresponding to each of the above change curve groups, in an optional implementation manner, the above step S202 includes:

[0047] Step S2021, the first control step, control the opening of the exhaust valve according to the above first change curve, and control the opening of the intake valve according to the above second change curve, so that the sequential supercharging system enters the above cut-in state;

[0048] Specifically, select any one of the above change curve groups, control the exhaust valve to open according to the first change curve in the above change curve group, and control the intake valve to open according to the second change curve in the above change curve group.

[0049] Step S2022, the first acquisition step, when the sequential supercharging system is in the above cut-in state, acquire the maximum rotational speed fluctuation, instantaneous fuel consumption rate, and smoke density;

[0050] Specifically, while controlling the opening of the exhaust valve and the intake valve according to the change curves of the above target change curve group, monitor the rotational speed change of the engine in the cut-in state according to a speed sensor, monitor the fuel consumption ejected from the fuel injector of the engine with an oil quantity sensor, and monitor the smoke density generated by the engine with a smoke sensor, calculate the maximum rotational speed fluctuation and instantaneous fuel consumption rate during the whole process, and then the maximum rotational speed fluctuation, instantaneous fuel consumption rate, and smoke density corresponding to the above change curve group can be obtained.

[0051] Step S2023, repeat the above control step and the above acquisition step at least once in sequence until the maximum rotational speed fluctuation, instantaneous fuel consumption rate, and smoke density corresponding to all the above change curve groups are obtained.

[0052] Specifically, in the above step S2021 and the above step S2022, the maximum rotational speed fluctuation corresponding to one of the above change curve groups is obtained. Repeat the above steps and traverse each of the above change curve groups, and then the maximum rotational speed fluctuation, instantaneous fuel consumption rate, and smoke density corresponding to all the change curve groups can be obtained.

[0053] In order to obtain a more optimized control method for the flexible opening of the control valve, in an alternative embodiment, before the above step S204, the method further includes:

[0054] Step S301, acquire a first response duration and a second response duration, where the first response duration is the duration consumed for the exhaust valve to open according to the above first target change curve, and the second response duration is the duration consumed for the intake valve to open according to the above second target change curve;

[0055] Specifically, as Figure 4 and Figure 5As shown, the opening change factor is the above-mentioned response time. After the above-mentioned first target change curve and the above-mentioned second target change curve are determined, the corresponding duration consumed by the opening of the exhaust valve and the duration consumed by the heuristic opening are already determined. However, the time is not changed during the above-mentioned curve setting process. Therefore, the duration consumed by the opening of the exhaust valve and the duration consumed by the heuristic opening are the same as those when opening according to the unique response characteristics of the motor, and the inherent opening duration of the motor is not necessarily the optimal duration. Therefore, it is necessary to calibrate the opening duration of the control valve.

[0056] Step S302, generate a first response duration set according to the above-mentioned first response duration, and generate a second response duration set according to the above-mentioned second response duration. The ratio of the response duration in the above-mentioned first response duration set to the above-mentioned first response duration is within a third predetermined range, and the ratio of the response duration in the above-mentioned second response duration set to the above-mentioned second response duration is within a fourth predetermined range;

[0057] Specifically, when generating the above-mentioned first response duration set and the above-mentioned second response duration set according to the above-mentioned first response duration and the above-mentioned second response duration respectively, the above-mentioned first response duration set includes multiple response durations. In an embodiment of the present application, the ratio of the response duration to the obtained above-mentioned first response duration is between 0.5 and 2. Similarly, the above-mentioned second response duration set includes multiple response durations. In an embodiment of the present application, the ratio of the response duration to the obtained above-mentioned second response duration is between 0.5 and 2.

[0058] Step S303, generate multiple response duration groups according to the above-mentioned first response duration set and the above-mentioned second response duration set. One above-mentioned response duration group includes a first response duration and a second response duration;

[0059] Specifically, because the pressure in the cylinder during the sequential supercharging process is affected by the opening of the exhaust valve and the opening of the intake valve at the same time, there should be the corresponding response durations of the above-mentioned exhaust valve and the above-mentioned intake valve in one experimental group.

[0060] Step S304, control the opening of the above-mentioned exhaust valve and the above-mentioned intake valve according to each above-mentioned response duration group, so that the sequential supercharging system enters the cut-in state, and obtain multiple above-mentioned maximum rotational speed fluctuations, instantaneous fuel consumption rates, and smoke densities of the above-mentioned engine. The above-mentioned maximum rotational speed fluctuations correspond to the above-mentioned response duration group one by one, the above-mentioned instantaneous fuel consumption rate corresponds to the above-mentioned response duration group one by one, and the smoke density corresponds to the above-mentioned response duration group one by one;

[0061] Specifically, perform corresponding scaling on the first target change curve according to the ratio of the response duration in the above-mentioned first response duration group to the above-mentioned first response duration, and perform corresponding scaling on the second target change curve according to the ratio of the response duration in the second response duration group to the above-mentioned second response duration. Control the exhaust valve and the intake valve to flexibly open according to the scaled target change curve group, and the maximum rotational speed fluctuation, instantaneous fuel consumption rate, and smoke density corresponding to each group of response durations can be obtained. Measure the maximum rotational speed fluctuation, instantaneous fuel consumption rate, and smoke density for each group of response durations. Therefore, each maximum rotational speed fluctuation, instantaneous fuel consumption rate, or smoke density has a unique corresponding change curve group as described above.

[0062] Step S305: Based on the comprehensive evaluation of the above-mentioned maximum rotational speed fluctuation, instantaneous fuel consumption rate, and smoke density, determine the first target response duration and the second target response duration. The first target response duration is the first response duration corresponding to the minimum maximum rotational speed fluctuation, the instantaneous fuel consumption rate within the fifth predetermined range, and the smoke density within the sixth predetermined range. The second target response duration is the second response duration corresponding to the minimum maximum rotational speed fluctuation, the instantaneous fuel consumption rate within the fifth predetermined range, and the smoke density within the sixth predetermined range.

[0063] Specifically, by comparing the maximum rotational speed fluctuation, instantaneous fuel consumption rate, and smoke density corresponding to each of the above-mentioned response duration groups, a response duration group that minimizes the maximum fluctuation, has the instantaneous fuel consumption rate within the fifth predetermined range, and has the smoke density within the sixth predetermined range can be obtained. Thus, the exhaust valve opening response duration and the intake valve response duration that minimize the cylinder pressure change during the sequential supercharging process are obtained, that is, the exhaust valve opening response duration and the intake valve response duration with the optimal control effect, and the first target response duration and the second target response duration are obtained.

[0064] Among them, when selecting the response duration group with the optimal control effect, in theory, the response duration group that minimizes the maximum rotational speed fluctuation, the instantaneous fuel consumption rate, and the smoke amount should be selected. However, in the actual experimental process, the instantaneous fuel consumption rate and smoke density are affected not only by the engine speed fluctuation, and it is difficult to obtain a response duration group in which the three parameters are simultaneously minimized. Therefore, the fifth predetermined range and the sixth predetermined range are set. When the maximum fluctuation is the smallest, and at the same time, when the instantaneous fuel consumption rate is within the fifth predetermined range and the smoke density is within the sixth predetermined range, the corresponding response duration is determined as the response duration with the optimal control effect.

[0065] In order to obtain the maximum rotational speed fluctuation corresponding to each of the above-mentioned change curve groups, in an optional implementation manner, the above-mentioned step S304 includes:

[0066] Step S3041, the second control step, control the exhaust valve to open according to the above first response duration, and control the intake valve to open according to the above second response duration, so that the sequential supercharging system enters the above cut-in state;

[0067] Specifically, select any group from the above response duration groups, control the exhaust valve to open according to the above first response duration in the above response duration groups, and control the intake valve to open according to the above second response duration in the above change curve groups.

[0068] Step S3042, the second acquisition step, when the sequential supercharging system is in the above cut-in state, acquire the above maximum rotational speed fluctuation amount, instantaneous fuel consumption rate, and smoke density;

[0069] Specifically, while controlling the exhaust valve and the intake valve to open according to the response duration of the above target response duration group, monitor the rotational speed change of the engine in the cut-in state according to a speed sensor, monitor the fuel injection of the engine injector with an oil consumption sensor, and monitor the smoke density generated by the engine with a smoke sensor, calculate the above maximum rotational speed fluctuation amount and instantaneous fuel consumption rate during the whole process, and then the above maximum rotational speed fluctuation amount, instantaneous fuel consumption rate, and smoke density corresponding to the above response duration group can be obtained.

[0070] Step S3043, repeat the above control step and the above acquisition step at least once in sequence until the above maximum rotational speed fluctuation amount, instantaneous fuel consumption rate, and smoke density corresponding to all the above response duration groups are obtained.

[0071] Specifically, in the above step S3021 and the above step S3022, obtain the above maximum rotational speed fluctuation amount corresponding to one of the above response duration groups, repeat the above steps, and traverse each of the above response duration groups, then the above maximum rotational speed fluctuation amount, instantaneous fuel consumption rate, and smoke density corresponding to all the response duration groups can be obtained.

[0072] In order to obtain a more optimized control method for flexible opening of the control valve, in an optional implementation manner, the above step S204 further includes:

[0073] Step S2041, correct the above first target change curve according to the above first target response duration to obtain a first corrected change curve, and the response duration of the above first corrected change curve is the above first target response duration;

[0074] Specifically, after obtaining the above-mentioned first target response duration, replace the opening duration of the above-mentioned exhaust valve with the above-mentioned first target response duration, that is, scale the above-mentioned first target change curve according to the ratio of the above-mentioned first target response duration to the above-mentioned first response duration, and then the first corrected change curve can be obtained, which can minimize the maximum fluctuation amount of the above-mentioned rotational speed, keep the above-mentioned instantaneous fuel consumption rate within the fifth predetermined range, and keep the above-mentioned smoke density within the sixth predetermined range.

[0075] Step S2042: Correct the above-mentioned second target change curve according to the above-mentioned second target response duration to obtain a second corrected change curve, and the response duration of the above-mentioned second corrected change curve is the above-mentioned second target response duration.

[0076] Specifically, after obtaining the above-mentioned second target response duration, replace the opening duration of the above-mentioned exhaust valve with the above-mentioned second target response duration, that is, scale the above-mentioned second target change curve according to the ratio of the above-mentioned second target response duration to the above-mentioned second response duration, and then the second corrected change curve can be obtained, which can minimize the maximum fluctuation amount of the above-mentioned rotational speed, keep the above-mentioned instantaneous fuel consumption rate within the fifth predetermined range, and keep the above-mentioned smoke density within the sixth predetermined range.

[0077] Step S2043: Control the above-mentioned exhaust valve to open according to the above-mentioned first corrected change curve, and control the above-mentioned intake valve to open according to the above-mentioned second corrected change curve.

[0078] Specifically, the above-mentioned optimal exhaust valve opening degree change curve and the above-mentioned optimal intake valve change curve constitute the optimal control method for the flexible opening of the optimal successive supercharging process control valve. Controlling the opening of the above-mentioned exhaust valve and the above-mentioned intake valve according to the above-mentioned control method can obtain the optimal successive supercharging effect.

[0079] In order to obtain a more optimized control method for the flexible opening of the control valve, in an optional implementation manner, before the above-mentioned step S204, the above-mentioned method further includes:

[0080] Step S401: Obtain a first correction coefficient, a second correction coefficient, and an original delay duration. The above-mentioned first correction coefficient is the coefficient corresponding to the above-mentioned first target response duration, the above-mentioned second correction coefficient is the coefficient corresponding to the above-mentioned second target response duration, the above-mentioned original delay duration is the time interval between the opening moment of the above-mentioned exhaust valve and the opening moment of the above-mentioned intake valve, and the above-mentioned first correction coefficient and the above-mentioned second correction coefficient are obtained through a calibration experiment.

[0081] Specifically, the change in the response time will affect the delay duration between the opening of the exhaust valve and the opening of the intake valve. Therefore, it is necessary to correct the influence of the variable slope flexible opening of the control valve on this delay time.

[0082] Step S402: Calculate the corrected delay duration based on the first correction coefficient and the first target response duration, the second correction coefficient and the second target response duration, and the original delay duration.

[0083] Specifically, let the corrected time be T1, the original delay duration be T, the first target response duration be t e , the second target response duration be t i , the first correction coefficient be a, and the second correction coefficient be b. Then T1 = T + a * t e + b * t i . Calculate the above formula to obtain the corrected delay duration. The first correction coefficient and the second correction coefficient can be obtained by looking up a table, and the correction table is obtained through calibration experiments. When the first target response duration is greater than the first response duration, the first correction coefficient is positive; when the first target response duration is less than the first response duration, the first correction coefficient is negative. The same applies to the second correction coefficient.

[0084] Step S403: Control the intake valve to open at the target time, where the target time is after the exhaust valve opens and is separated from the opening time by the corrected delay duration.

[0085] Specifically, the corrected delay duration is the optimal delay duration, that is, the delay duration with the best control effect. Therefore, controlling the intake valve to open after the exhaust valve opens and separated by the corrected delay duration can obtain the optimal control effect.

[0086] In order to enable normal supercharging in the sequential supercharging process, in an alternative embodiment, the above step S204 includes:

[0087] Step S2044: Control the air intake valve to open after the gas intake valve opens.

[0088] Specifically, the intake valve includes an air intake valve and a gas intake valve. The gas intake valve opens first to introduce combustible gas, and then the air intake valve opens to introduce air, ignite the combustible gas, and supercharge the driving cylinder. If the air intake valve opens first, the pressure provided will decrease due to insufficient combustible gas.

[0089] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the control method for the sequential supercharging system of the present application will be described in detail below with specific embodiments.

[0090] This embodiment relates to a specific control method for a sequential supercharging system, as Figure 6 shown, and includes the following steps:

[0091] Step S1: Set the curve of the exhaust control valve opening varying with time, the curve of the intake control valve opening varying with time, the response time of the exhaust control valve, and the response time of the intake control valve;

[0092] Step S2: Monitor the engine speed through a speed sensor, monitor the fuel injection amount through a liquid sensor, and monitor the soot amount through a smoke sensor;

[0093] Step S3: Through calibration experiments, select the optimal change curve based on the maximum fluctuation amount of the engine speed, the increased fuel injection amount during successive supercharging processes, and the increased soot amount, that is, the change curve that minimizes the above-mentioned monitored data;

[0094] Step S4: Correct the intake valve delay opening time according to the calibration experiment to obtain the corrected delay time;

[0095] Step S5: Control the opening of the exhaust control valve and the intake control valve according to the selected optimal change curve, the optimal response time, and the corrected delay time.

[0096] It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. And although the logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in a different order.

[0097] The embodiment of the present application also provides a control device for a successive supercharging system. It should be noted that the control device for the successive supercharging system in the embodiment of the present application can be used to execute the control method for the successive supercharging system provided by the embodiment of the present application. The device is used to implement the above-mentioned embodiments and preferred implementation manners, and those that have been described will not be repeated. As used hereinafter, the term "module" can be a combination of software and / or hardware that can implement a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0098] The following introduces the control device for the successive supercharging system provided by the embodiment of the present application.

[0099] Figure 7 is a schematic diagram of the control device for the successive supercharging system according to the embodiment of the present application. As Figure 7 shown, the device includes:

[0100] The first generating unit 100 is configured to generate a plurality of groups of variation curves. One group of the variation curves includes a first variation curve and a second variation curve. The first variation curve is a curve showing the variation of the opening degree of the exhaust valve of the controlled supercharger with time, and the second variation curve is a curve showing the variation of the opening degree of the intake valve of the controlled supercharger with time;

[0101] Specifically, in the prior art, during the sequential supercharging process, the intake valve and the exhaust valve are controlled by a motor and opened according to the unique response characteristics of the motor, that is, they are opened at a constant speed until the opening degree reaches 100. As Figure 4 shown, in this application, the opening processes of the exhaust valve and the intake valve are modified, and the curves showing the variation of the opening degrees of the exhaust valve and the intake valve with time are respectively set. However, setting only one opening degree variation curve cannot obtain the best control method. Therefore, as Figure 5 shown, a plurality of opening degree variation curves are set, and the optimal curve is selected from them through experiments. Since the pressure in the cylinder during the sequential supercharging process is affected by both the opening degree of the exhaust valve and the opening degree of the intake valve, there should be corresponding opening degree variation curves of the exhaust valve and the intake valve in one experimental group.

[0102] The first obtaining unit 200 is configured to control the opening of the exhaust valve and the intake valve according to each group of the variation curves, so that the sequential supercharging system enters the cut-in state, and obtain a plurality of maximum rotational speed fluctuations, instantaneous fuel consumption rates, and smoke densities of the engine. The maximum rotational speed fluctuations correspond to the groups of the variation curves one by one, the instantaneous fuel consumption rates correspond to the groups of the variation curves one by one, and the smoke densities correspond to the groups of the variation curves one by one. The cut-in state is the state of the sequential supercharging system during the process from the moment when both the exhaust valve and the intake valve are opened until the moment when both the exhaust valve and the intake valve reach the maximum opening degree. The maximum rotational speed fluctuation is the maximum value of the difference between the rotational speed of the engine in the cut-in state and the rotational speed of the engine before sequential supercharging. The instantaneous fuel consumption rate is the instantaneous fuel consumption rate of the engine in the cut-in state, and the smoke density is the amount of soot discharged by the engine in the cut-in state;

[0103] Specifically, during the transient switching process of sequential supercharging, the intake pressure decreases, and the intake air flow rate after intercooling decreases, resulting in poor combustion, large fluctuations in the engine speed. At the same time, in order to stabilize the engine speed, the engine needs to increase fuel injection, leading to increased fuel consumption, further deterioration of combustion, and increased soot. The most fundamental reason is the decrease in pressure in the cylinder, resulting in engine speed fluctuations. Therefore, the above maximum speed fluctuation amount, instantaneous fuel consumption rate, and engine emission soot are used as indicators to measure the control effect of the above change curve group. Controlling the above exhaust valve and the above intake valve to open flexibly according to the above change curve group, the maximum speed fluctuation amount, instantaneous fuel consumption rate, and soot corresponding to each group of control methods can be obtained. For each group of change curves, its maximum speed fluctuation amount, instantaneous fuel consumption rate, and soot are measured. Therefore, each maximum speed fluctuation amount, instantaneous fuel consumption rate, or soot has a unique corresponding above change curve group.

[0104] The first determination unit 300 is configured to determine a first target change curve and a second target change curve based on the comprehensive evaluation of the above maximum speed fluctuation amount, instantaneous fuel consumption rate, and soot. The above first target change curve is the above first change curve corresponding to the minimum maximum speed fluctuation amount, the instantaneous fuel consumption rate within a first predetermined range, and the soot within a second predetermined range. The above second target change curve is the above second change curve corresponding to the minimum maximum speed fluctuation amount, the instantaneous fuel consumption rate within a first predetermined range, and the soot within a second predetermined range.

[0105] Specifically, by comparing the above maximum speed fluctuation amount, instantaneous fuel consumption rate, and soot corresponding to each of the above change curve groups, taking the above maximum speed fluctuation amount as the most important indicator and the above instantaneous fuel consumption rate and soot as secondary indicators, a change curve group that minimizes the above maximum fluctuation amount, has the instantaneous fuel consumption rate within a first predetermined range, and has the soot within a second predetermined range can be obtained, and thus the exhaust valve opening change curve and the intake valve change curve that minimize the cylinder pressure change during the sequential supercharging process, that is, the above exhaust valve opening change curve and the above intake valve change curve with the optimal control effect, are obtained, and the above first target change curve and the above second target change curve are obtained.

[0106] Among them, when selecting the change curve with the optimal control effect, theoretically, the change curve group that minimizes the above maximum speed fluctuation amount, the above instantaneous fuel consumption rate, and the above soot amount should be selected. However, in the actual experimental process, the instantaneous fuel consumption rate and soot are not only affected by engine speed fluctuations, and it is difficult to obtain a change curve group in which the three parameters are simultaneously minimized. Therefore, the above first predetermined range and the above second predetermined range are set. When the above maximum fluctuation amount is the smallest and the instantaneous fuel consumption rate is within the first predetermined range and the soot is within the second predetermined range at the same time, the corresponding curve is determined as the change curve with the optimal control effect.

[0107] In another embodiment of the present application, for the above maximum fluctuation amount, instantaneous fuel consumption rate, and smoke density, the corresponding parameter scores are obtained by looking up tables based on the monitored parameters respectively, and then the respective score parameters are multiplied by the corresponding weights to obtain the corresponding scores of the above change curves. The change curve with the highest score is selected as the target change curve. The above parameter scores and weights are obtained from calibration experiments.

[0108] The first control unit 400 controls the above exhaust valve to open according to the above first target change curve, and controls the above intake valve to open according to the above second target change curve.

[0109] Specifically, the above optimal exhaust valve opening change curve and the above optimal intake valve change curve constitute the optimal control method for the flexible opening of the optimal successive supercharging process control valve. By controlling the opening of the above exhaust valve and the above intake valve according to the above control method, the optimal successive supercharging effect can be obtained.

[0110] Through the above embodiments, the first generating unit generates a plurality of change curve groups. One of the above change curve groups includes a first change curve and a second change curve. The first change curve is a change curve of the opening degree of the exhaust valve of the controlled supercharger changing with time, and the second change curve is a change curve of the opening degree of the intake valve of the controlled supercharger changing with time. The first obtaining unit controls the opening of the exhaust valve and the intake valve according to each of the above change curve groups, so that the sequential supercharging system enters the cut-in state, and obtains a plurality of maximum rotational speed fluctuations, instantaneous fuel consumption rates, and smoke densities of the engine. The maximum rotational speed fluctuations correspond one-to-one with the change curve groups, the instantaneous fuel consumption rates correspond one-to-one with the change curve groups, and the smoke densities correspond one-to-one with the change curve groups. The cut-in state is the state of the sequential supercharging system during the process from the moment when both the exhaust valve and the intake valve are opened until the moment when both the exhaust valve and the intake valve reach the maximum opening degree. The maximum rotational speed fluctuation is the maximum value of the difference between the rotational speed of the engine in the cut-in state and the rotational speed of the engine before sequential supercharging. The instantaneous fuel consumption rate is the instantaneous fuel consumption rate of the engine in the cut-in state, and the smoke density is the amount of soot discharged by the engine in the cut-in state. The first determining unit comprehensively evaluates according to the maximum rotational speed fluctuation, instantaneous fuel consumption rate, and smoke density, and determines a first target change curve and a second target change curve. The first target change curve is the first change curve corresponding to the minimum maximum rotational speed fluctuation, the instantaneous fuel consumption rate being within a first predetermined range, and the smoke density being within a second predetermined range. The second target change curve is the second change curve corresponding to the minimum maximum rotational speed fluctuation, the instantaneous fuel consumption rate being within a first predetermined range, and the smoke density being within a second predetermined range. The first control unit controls the exhaust valve to open according to the first target change curve and controls the intake valve to open according to the second target change curve. This method realizes the flexible opening of the control valve with a variable slope of the opening degree by calibrating the opening degree change curve during the opening process of the exhaust control valve and the intake control valve, achieves the effect of reducing the supercharging pressure loss during the transient switching process and reducing the impact on the engine, and solves the problem of large engine speed fluctuations during the transient switching process in the prior art.

[0111] In order to obtain the maximum rotational speed fluctuation corresponding to each of the above change curve groups, in an alternative embodiment, the first obtaining unit includes:

[0112] The first control module is used to execute the first control step, control the opening of the exhaust valve according to the first change curve, control the opening of the intake valve according to the second change curve, and make the sequential supercharging system enter the cut-in state;

[0113] Specifically, select any one of the above change curve groups, control the above exhaust valve to open according to the above first change curve in the above change curve group, and control the above intake valve to open according to the above second change curve in the above change curve group.

[0114] The first acquisition module is used to execute the first acquisition step. When the above sequential supercharging system is in the above cut-in state, acquire the above maximum rotational speed fluctuation, instantaneous fuel consumption rate, and smoke density.

[0115] Specifically, while controlling the opening of the above exhaust valve and the above intake valve according to the change curves of the above target change curve group, monitor the rotational speed change of the above engine in the cut-in state according to a speed sensor, monitor the fuel injection of the engine injector with a fuel consumption sensor, and monitor the smoke density generated by the engine with a smoke sensor, and calculate the above maximum rotational speed fluctuation and instantaneous fuel consumption rate during the whole process, so as to obtain the above maximum rotational speed fluctuation, instantaneous fuel consumption rate, and smoke density corresponding to the above change curve group.

[0116] The first repetition module is used to sequentially repeat the above control step and the above acquisition step at least once until the above maximum rotational speed fluctuation, instantaneous fuel consumption rate, and smoke density corresponding to all the above change curve groups are obtained.

[0117] Specifically, the above first control module and the above first acquisition module obtain the above maximum rotational speed fluctuation corresponding to one above change curve group, and repeatedly call the above modules to traverse each above change curve group, so as to obtain the above maximum rotational speed fluctuation, instantaneous fuel consumption rate, and smoke density corresponding to all the change curve groups.

[0118] In order to obtain a more optimized control method for the flexible opening of the control valve, in an alternative embodiment, the above device further includes:

[0119] The second acquisition unit is used to acquire a first response duration and a second response duration before controlling the above exhaust valve to open according to the above first target change curve and controlling the above intake valve to open according to the above second target change curve. The first response duration is the duration consumed by the above exhaust valve to open according to the above first target change curve, and the second response duration is the duration consumed by the above intake valve to open according to the above second target change curve.

[0120] Specifically, after the above-mentioned first target change curve and the above-mentioned second target change curve are determined, the duration consumed by the opening of the exhaust valve and the duration consumed by the heuristic opening corresponding thereto are already determined. However, the time is not changed during the above-mentioned curve setting process. Therefore, the duration consumed by the opening of the exhaust valve and the duration consumed by the heuristic opening are the same as those when opening according to the unique response characteristics of the motor, and the inherent opening duration of the motor is not necessarily the optimal duration. Therefore, it is necessary to calibrate the opening duration of the control valve.

[0121] A second generating unit, configured to generate a first response duration set according to the above-mentioned first response duration, and generate a second response duration set according to the above-mentioned second response duration. The ratio of the response durations in the above-mentioned first response duration set to the above-mentioned first response duration is within a third predetermined range, and the ratio of the response durations in the above-mentioned second response duration set to the above-mentioned second response duration is within a fourth predetermined range;

[0122] Specifically, when generating the above-mentioned first response duration set and the above-mentioned second response duration set according to the above-mentioned first response duration and the above-mentioned second response duration respectively, the above-mentioned first response duration set includes multiple response durations. In an embodiment of the present application, the ratio of the response duration to the obtained above-mentioned first response duration is between 0.5 and 2. Similarly, the above-mentioned second response duration set includes multiple response durations. In an embodiment of the present application, the ratio of the response duration to the obtained above-mentioned second response duration is between 0.5 and 2.

[0123] A third generating unit, configured to generate multiple response duration groups according to the above-mentioned first response duration set and the above-mentioned second response duration set. One above-mentioned response duration group includes a first response duration and a second response duration;

[0124] Specifically, because the pressure in the cylinder during the sequential supercharging process is affected by the opening degrees of both the exhaust valve and the intake valve at the same time, there should be the corresponding response durations of the above-mentioned exhaust valve and the above-mentioned intake valve in one experimental group.

[0125] A second obtaining unit, configured to control the opening of the above-mentioned exhaust valve and the above-mentioned intake valve according to each of the above-mentioned response duration groups, so that the sequential supercharging system enters the cut-in state, and obtain multiple above-mentioned maximum rotational speed fluctuation amounts, instantaneous fuel consumption rates, and smoke densities of the above-mentioned engine. The above-mentioned maximum rotational speed fluctuation amounts correspond to the above-mentioned response duration groups one by one, the above-mentioned instantaneous fuel consumption rates correspond to the above-mentioned response duration groups one by one, and the smoke densities correspond to the above-mentioned response duration groups one by one;

[0126] Specifically, perform corresponding scaling on the above first target change curve according to the ratio of the response duration in the above first response duration group to the above first response duration, and perform corresponding scaling on the above second target change curve according to the ratio of the response duration in the above second response duration group to the above second response duration. Control the above exhaust valve and the above intake valve to open flexibly according to the scaled target change curve group, and the maximum rotational speed fluctuation amount, instantaneous fuel consumption rate, and smoke density corresponding to each group of response durations can be obtained. Measure the maximum rotational speed fluctuation amount, instantaneous fuel consumption rate, and smoke density for each group of response durations. Therefore, each maximum rotational speed fluctuation amount, instantaneous fuel consumption rate, or smoke density has a unique corresponding above change curve group.

[0127] A second determination unit, configured to determine a first target response duration and a second target response duration based on a comprehensive evaluation of the above maximum rotational speed fluctuation amount, instantaneous fuel consumption rate, and smoke density. The above first target response duration is the above first response duration corresponding to the minimum above maximum rotational speed fluctuation amount, the instantaneous fuel consumption rate being within a fifth predetermined range, and the smoke density being within a sixth predetermined range. The above second target response duration is the above second response duration corresponding to the minimum above maximum rotational speed fluctuation amount, the instantaneous fuel consumption rate being within a fifth predetermined range, and the smoke density being within a sixth predetermined range.

[0128] Specifically, by comparing the above maximum rotational speed fluctuation amount, instantaneous fuel consumption rate, and smoke density corresponding to each of the above response duration groups, a group of the above response durations that minimizes the above maximum fluctuation amount, has the instantaneous fuel consumption rate within the above fifth predetermined range, and has the smoke density within the above sixth predetermined range can be obtained, thereby obtaining the exhaust valve opening response duration and the intake valve response duration that minimize the cylinder pressure change during the sequential supercharging process, that is, the above exhaust valve opening response duration and the above intake valve response duration with the optimal control effect, and obtaining the above first target response duration and the above second target response duration.

[0129] Among them, when selecting the response duration group with the optimal control effect, in theory, the response duration group that minimizes the above maximum rotational speed fluctuation amount, the above instantaneous fuel consumption rate, and the above smoke amount should be selected. However, in the actual experimental process, the instantaneous fuel consumption rate and smoke density are not only affected by the engine speed fluctuation, and it is difficult to obtain a response duration group in which the three parameters are simultaneously minimized. Therefore, the above fifth predetermined range and the above sixth predetermined range are set. When the above maximum fluctuation amount is the smallest, and at the same time, when the instantaneous fuel consumption rate is within the fifth predetermined range and the smoke density is within the sixth predetermined range, the corresponding response duration is determined to be the response duration with the optimal control effect.

[0130] In order to obtain the above maximum rotational speed fluctuation corresponding to each of the above change curve groups, in an optional implementation manner, the above second acquisition unit includes:

[0131] The second control module is used to execute the second control step, control the opening of the exhaust valve according to the above first response duration, control the opening of the intake valve according to the above second response duration, and make the above sequential supercharging system enter the above cut-in state;

[0132] Specifically, select any group from the above response duration groups, control the exhaust valve to open according to the first response duration in the above response duration group, and control the intake valve to open according to the second response duration in the above change curve group.

[0133] The second acquisition module is used to execute the second acquisition step, and acquire the above maximum rotational speed fluctuation amount, instantaneous fuel consumption rate, and smoke density when the above sequential supercharging system is in the above cut-in state;

[0134] Specifically, while controlling the opening of the exhaust valve and the intake valve according to the response durations of the above target response duration group, monitor the rotational speed change of the engine in the cut-in state according to a speed sensor, monitor the fuel injection of the engine injector with a fuel consumption sensor, and monitor the smoke density generated by the engine with a smoke sensor, calculate the above maximum rotational speed fluctuation amount and instantaneous fuel consumption rate during the whole process, and thus obtain the above maximum rotational speed fluctuation amount, instantaneous fuel consumption rate, and smoke density corresponding to the above response duration group.

[0135] The second repetition module is used to sequentially repeat the above control step and the above acquisition step at least once until the above maximum rotational speed fluctuation amount, instantaneous fuel consumption rate, and smoke density corresponding to all the above response duration groups are obtained.

[0136] Specifically, the above second acquisition module and the above second repetition module obtain the above maximum rotational speed fluctuation amount corresponding to one above response duration group, and repeatedly call the second control module and the second acquisition module to traverse each above response duration group, and thus obtain the above maximum rotational speed fluctuation amount, instantaneous fuel consumption rate, and smoke density corresponding to all the response duration groups.

[0137] In order to obtain a more optimized control method for flexible opening of the control valve, in an optional implementation manner, the above first control unit further includes:

[0138] The first correction module is used to correct the above first target change curve according to the above first target response duration to obtain a first corrected change curve, and the response duration of the above first corrected change curve is the above first target response duration;

[0139] Specifically, after obtaining the above-mentioned first target response duration, replace the opening duration of the above-mentioned exhaust valve with the above-mentioned first target response duration, that is, scale the above-mentioned first target change curve according to the ratio of the above-mentioned first target response duration to the above-mentioned first response duration, and then the first corrected change curve can be obtained, which can minimize the maximum fluctuation of the above-mentioned rotational speed, keep the above-mentioned instantaneous fuel consumption rate within the fifth predetermined range, and keep the above-mentioned smoke density within the sixth predetermined range.

[0140] A second correction module, configured to correct the above-mentioned second target change curve according to the above-mentioned second target response duration to obtain a second corrected change curve, and the response duration of the above-mentioned second corrected change curve is the above-mentioned second target response duration;

[0141] Specifically, after obtaining the above-mentioned second target response duration, replace the opening duration of the above-mentioned exhaust valve with the above-mentioned second target response duration, that is, scale the above-mentioned second target change curve according to the ratio of the above-mentioned second target response duration to the above-mentioned second response duration, and then the second corrected change curve can be obtained, which can minimize the maximum fluctuation of the above-mentioned rotational speed, keep the above-mentioned instantaneous fuel consumption rate within the fifth predetermined range, and keep the above-mentioned smoke density within the sixth predetermined range.

[0142] A third control module, configured to control the above-mentioned exhaust valve to open according to the above-mentioned first corrected change curve, and control the above-mentioned intake valve to open according to the above-mentioned second corrected change curve.

[0143] Specifically, the above-mentioned optimal exhaust valve opening degree change curve and the above-mentioned optimal intake valve change curve constitute the optimal control method for the flexible opening of the optimal successive supercharging process control valve. Controlling the opening of the above-mentioned exhaust valve and the above-mentioned intake valve according to the above-mentioned control method can obtain the optimal successive supercharging effect.

[0144] In order to obtain a more optimized control method for the flexible opening of the control valve, in an optional implementation manner, the above-mentioned device further includes:

[0145] A fourth acquisition unit, configured to obtain a first correction coefficient, a second correction coefficient, and an original delay duration before controlling the above-mentioned exhaust valve to open according to the above-mentioned first target change curve and controlling the above-mentioned intake valve to open according to the above-mentioned second target change curve. The first correction coefficient is the coefficient corresponding to the above-mentioned first target response duration, the second correction coefficient is the coefficient corresponding to the above-mentioned second target response duration, the original delay duration is the time interval between the opening moment of the above-mentioned exhaust valve and the opening moment of the above-mentioned intake valve, and the first correction coefficient and the second correction coefficient are obtained through a calibration experiment;

[0146] Specifically, the change in response time will affect the delay duration between the opening of the exhaust valve and the opening of the intake valve. Therefore, it is necessary to correct the influence of the variable slope flexible opening of the control valve on this delay time.

[0147] A calculation unit for calculating a corrected delay duration according to the first correction coefficient and the first target response duration, the second correction coefficient and the second target response duration, and the original delay duration.

[0148] Specifically, let the corrected time be T1, the original delay duration be T, the first target response duration be t e , the second target response duration be t i , the first correction coefficient be a, and the second correction coefficient be b. Then T1 = T + a * t e + b * t i . By calculating the above formula, the corrected delay duration can be obtained. The first correction coefficient and the second correction coefficient can be obtained by looking up a table, and the correction table is obtained through a calibration experiment. When the first target response duration is greater than the first response duration, the first correction coefficient is a positive number. When the first target response duration is less than the first response duration, the first correction coefficient is a negative number. The same applies to the second correction coefficient.

[0149] A second control unit for controlling the intake valve to open at a target time, where the target time is a time after the opening time of the exhaust valve and at an interval of the corrected delay duration from the opening time.

[0150] Specifically, the corrected delay duration is the optimal delay duration, that is, the optimal delay duration for the control effect. Therefore, controlling the intake valve to open at an interval of the corrected delay duration after the opening time of the exhaust valve can obtain the best control effect.

[0151] In order to enable normal supercharging during the successive supercharging process, in an alternative embodiment, the first control unit includes:

[0152] A fourth control module for controlling the air intake valve to open after the gas intake valve opens.

[0153] Specifically, the intake valve includes an air intake valve and a gas intake valve. The gas intake valve opens first to introduce combustible gas, and then the air intake valve opens to introduce air to ignite the combustible gas and supercharge the driving cylinder. If the air intake valve opens first, the pressure provided will decrease due to insufficient combustible gas.

[0154] The control device of the above sequential supercharging system includes a processor and a memory. The above first generating unit, first obtaining unit, first determining unit, first control unit, etc. are all stored in the memory as program units, and the processor executes the above program units stored in the memory to implement corresponding functions. The above modules are all located in the same processor; alternatively, the above modules are respectively located in different processors in any combination form.

[0155] The processor contains a kernel, and the kernel retrieves the corresponding program unit from the memory. One or more kernels can be set, and by adjusting the kernel parameters, the rotational speed fluctuation of the engine during the transient switching process of sequential supercharging can be reduced.

[0156] The memory may include non - permanent memory in a computer - readable medium, in the form of random access memory (RAM) and / or non - volatile memory, such as read - only memory (ROM) or flash RAM. The memory includes at least one memory chip.

[0157] The embodiment of the present invention provides a computer - readable storage medium. The above computer - readable storage medium includes a stored program. Wherein, when the above program runs, it controls the device where the computer - readable storage medium is located to execute the control method of the above sequential supercharging system.

[0158] The embodiment of the present invention provides a processor. The above processor is used to run a program. Wherein, when the above program runs, it executes the control method of the above sequential supercharging system.

[0159] The embodiment of the present invention provides a vehicle. The vehicle includes an engine, a processor, a memory, and a program stored on the memory and executable on the processor. The above engine 1 includes a sequential supercharging system. The above sequential supercharging system includes a plurality of parallel - connected controlled superchargers. In an embodiment of the present application, there are two above - mentioned controlled superchargers, including a first controlled supercharger 4 and a second controlled supercharger 7. The structure of the above sequential supercharging system is as Figure 8 shown. The above - mentioned controlled supercharger includes an exhaust valve 9 and an intake valve 8. The above sequential supercharging system further includes an air filter 10, a first basic supercharger 5, a second basic supercharger 6, as well as an exhaust side 2 and an intake side 3. When the processor executes the program, it realizes at least the following steps:

[0160] Step S201, generate a plurality of change curve groups. One above - mentioned change curve group includes a first change curve and a second change curve. The above - mentioned first change curve is a change curve of the opening degree of the exhaust valve of the above - mentioned controlled supercharger changing with time, and the above - mentioned second change curve is a change curve of the opening degree of the intake valve of the above - mentioned controlled supercharger changing with time;

[0161] Step S202: Control the opening of the exhaust valve and the intake valve according to each of the above change curve groups, so that the sequential supercharging system enters the cut-in state, and obtain multiple maximum rotational speed fluctuations, instantaneous fuel consumption rates, and smoke densities of the engine. The maximum rotational speed fluctuations correspond one-to-one with the above change curve groups, the instantaneous fuel consumption rates correspond one-to-one with the above change curve groups, and the smoke densities correspond one-to-one with the above change curve groups. The cut-in state is the state of the sequential supercharging system during the process from the moment when both the exhaust valve and the intake valve are opened until the moment when both the exhaust valve and the intake valve reach the maximum opening degree. The maximum rotational speed fluctuation is the maximum value of the difference between the rotational speed of the engine in the cut-in state and the rotational speed of the engine before sequential supercharging. The instantaneous fuel consumption rate is the instantaneous fuel consumption rate of the engine in the cut-in state. The smoke density is the amount of soot discharged by the engine in the cut-in state;

[0162] Step S203: Based on the comprehensive evaluation of the above maximum rotational speed fluctuations, instantaneous fuel consumption rates, and smoke densities, determine the first target change curve and the second target change curve. The first target change curve is the first change curve corresponding to the minimum maximum rotational speed fluctuation, the instantaneous fuel consumption rate being within a first predetermined range, and the smoke density being within a second predetermined range. The second target change curve is the second change curve corresponding to the minimum maximum rotational speed fluctuation, the instantaneous fuel consumption rate being within a first predetermined range, and the smoke density being within a second predetermined range;

[0163] Step S204: Control the exhaust valve to open according to the first target change curve, and control the intake valve to open according to the second target change curve.

[0164] The devices in this article can be servers, PCs, PADs, mobile phones, etc.

[0165] This application also provides a computer program product, which when executed on a data processing device, is adapted to execute a program initialized with at least the following method steps:

[0166] Step S201: Generate multiple change curve groups. One of the above change curve groups includes a first change curve and a second change curve. The first change curve is the change curve of the opening degree of the exhaust valve of the controlled supercharger changing with time. The second change curve is the change curve of the opening degree of the intake valve of the controlled supercharger changing with time;

[0167] Step S202: Control the opening of the exhaust valve and the intake valve according to each of the above change curve groups, so that the sequential supercharging system enters the cut-in state, and obtain multiple maximum rotational speed fluctuations, instantaneous fuel consumption rates, and smoke densities of the engine. The maximum rotational speed fluctuations correspond one-to-one with the above change curve groups, the instantaneous fuel consumption rates correspond one-to-one with the above change curve groups, and the smoke densities correspond one-to-one with the above change curve groups. The cut-in state is the state of the sequential supercharging system during the process from the moment when both the exhaust valve and the intake valve are opened until the moment when both the exhaust valve and the intake valve reach the maximum opening degree. The maximum rotational speed fluctuation is the maximum value of the difference between the rotational speed of the engine in the cut-in state and the rotational speed of the engine before sequential supercharging. The instantaneous fuel consumption rate is the instantaneous fuel consumption rate of the engine in the cut-in state. The smoke density is the amount of soot discharged by the engine in the cut-in state;

[0168] Step S203: Based on the comprehensive evaluation of the above maximum rotational speed fluctuations, instantaneous fuel consumption rates, and smoke densities, determine the first target change curve and the second target change curve. The first target change curve is the first change curve corresponding to the minimum maximum rotational speed fluctuation, the instantaneous fuel consumption rate being within the first predetermined range, and the smoke density being within the second predetermined range. The second target change curve is the second change curve corresponding to the minimum maximum rotational speed fluctuation, the instantaneous fuel consumption rate being within the first predetermined range, and the smoke density being within the second predetermined range;

[0169] Step S204: Control the exhaust valve to open according to the first target change curve, and control the intake valve to open according to the second target change curve.

[0170] Obviously, those skilled in the art should understand that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device. They can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. They can be implemented by program codes executable by the computing device. Thus, they can be stored in a storage device and executed by the computing device. And in some cases, the steps shown or described can be executed in a different order than here, or they can be separately fabricated into individual integrated circuit modules, or multiple modules or steps among them can be fabricated into a single integrated circuit module to implement. In this way, the present invention is not limited to any specific combination of hardware and software.

[0171] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) that contain computer-usable program code.

[0172] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0173] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0174] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0175] In a typical configuration, a computing device includes one or more processors (CPUs), an input / output interface, a network interface, and memory.

[0176] The memory may include non-permanent memory in the form of computer-readable media, random access memory (RAM), and / or non-volatile memory such as read-only memory (ROM) or flash memory (flash RAM). The memory is an example of computer-readable media.

[0177] A computer-readable medium includes both permanent and non-permanent, removable and non-removable media and can implement information storage by any method or technology. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer-readable medium does not include transitory computer-readable media, such as modulated data signals and carrier waves.

[0178] It should also be noted that the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or apparatus. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising the element.

[0179] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0180] 1) The control method of the sequential supercharging system of the present application. First, generate multiple groups of change curves. One such group of change curves includes a first change curve and a second change curve. The first change curve is the change curve of the opening degree of the exhaust valve of the controlled supercharger changing with time, and the second change curve is the change curve of the opening degree of the intake valve of the controlled supercharger changing with time. Then, control the opening of the exhaust valve and the intake valve according to each group of change curves, so that the sequential supercharging system enters the cut-in state, and obtain multiple maximum rotational speed fluctuation amounts, instantaneous fuel consumption rates, and smoke densities of the engine. The maximum rotational speed fluctuation amounts correspond one-to-one with the groups of change curves, the instantaneous fuel consumption rates correspond one-to-one with the groups of change curves, and the smoke densities correspond one-to-one with the groups of change curves. The cut-in state is the state of the sequential supercharging system during the process from the moment when both the exhaust valve and the intake valve are opened until the moment when both the exhaust valve and the intake valve reach the maximum opening degree. The maximum rotational speed fluctuation amount is the maximum value of the difference between the rotational speed of the engine in the cut-in state and the rotational speed of the engine before sequential supercharging. The instantaneous fuel consumption rate is the instantaneous fuel consumption rate of the engine in the cut-in state, and the smoke density is the amount of soot discharged by the engine in the cut-in state. After that, comprehensively evaluate according to the maximum rotational speed fluctuation amount, instantaneous fuel consumption rate, and smoke density to determine the first target change curve and the second target change curve. The first target change curve is the first change curve corresponding to the minimum maximum rotational speed fluctuation amount, the instantaneous fuel consumption rate being within the first predetermined range, and the smoke density being within the second predetermined range. The second target change curve is the second change curve corresponding to the minimum maximum rotational speed fluctuation amount, the instantaneous fuel consumption rate being within the first predetermined range, and the smoke density being within the second predetermined range. Finally, control the exhaust valve to open according to the first target change curve, and control the intake valve to open according to the second target change curve. This method realizes the flexible opening of the control valve with a variable slope of the opening degree by calibrating the opening degree change curve during the opening process of the exhaust control valve and the intake control valve, achieves the effect of reducing the supercharging pressure loss during the transient switching process and reducing the impact on the engine, and solves the problem of large engine rotational speed fluctuations during the transient switching process in the prior art.

[0181] 2) The control device of the sequential supercharging system of the present application, the first generating unit generates a plurality of change curve groups, one of the above change curve groups includes a first change curve and a second change curve, the first change curve is the change curve of the opening degree of the exhaust valve of the controlled supercharger changing with time, and the second change curve is the change curve of the opening degree of the intake valve of the controlled supercharger changing with time; the first obtaining unit controls the opening of the exhaust valve and the intake valve according to each of the above change curve groups, so that the sequential supercharging system enters the cut-in state, and obtains a plurality of maximum rotational speed fluctuation amounts, instantaneous fuel consumption rates, and smoke densities of the engine. The maximum rotational speed fluctuation amount corresponds to one of the change curve groups, the instantaneous fuel consumption rate corresponds to one of the change curve groups, and the smoke density corresponds to one of the change curve groups. The cut-in state is the state of the sequential supercharging system during the process from the moment when both the exhaust valve and the intake valve are opened until the moment when both the exhaust valve and the intake valve reach the maximum opening degree. The maximum rotational speed fluctuation amount is the maximum value of the difference between the rotational speed of the engine in the cut-in state and the rotational speed of the engine before sequential supercharging. The instantaneous fuel consumption rate is the instantaneous fuel consumption rate of the engine in the cut-in state, and the smoke density is the amount of soot discharged by the engine in the cut-in state; the first determining unit comprehensively evaluates according to the above maximum rotational speed fluctuation amount, instantaneous fuel consumption rate, and smoke density, and determines a first target change curve and a second target change curve. The first target change curve is the first change curve corresponding to the minimum maximum rotational speed fluctuation amount, the instantaneous fuel consumption rate being within a first predetermined range, and the smoke density being within a second predetermined range. The second target change curve is the second change curve corresponding to the minimum maximum rotational speed fluctuation amount, the instantaneous fuel consumption rate being within a first predetermined range, and the smoke density being within a second predetermined range; the first control unit controls the exhaust valve to open according to the first target change curve, and controls the intake valve to open according to the second target change curve. This method calibrates the opening degree change curve during the opening process of the exhaust control valve and the intake control valve, realizes the flexible opening of the control valve opening degree with a variable slope, achieves the effect of reducing the supercharging pressure loss during the transient switching process and reducing the impact on the engine, and solves the problem of large engine rotational speed fluctuation during the transient switching process in the prior art.

[0182] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A control method for a sequential supercharging system, characterized in that, The sequential supercharging system includes a plurality of controlled superchargers connected in parallel. Each controlled supercharger includes an exhaust valve and an intake valve. The control method includes: Generating a plurality of sets of variation curves. One set of variation curves includes a first variation curve and a second variation curve. The first variation curve is a curve showing the variation of the opening degree of the exhaust valve of the controlled supercharger with time, and the second variation curve is a curve showing the variation of the opening degree of the intake valve of the controlled supercharger with time; Controlling the opening of the exhaust valve and the intake valve according to each set of variation curves to make the sequential supercharging system enter the cut-in state, and obtaining a plurality of maximum engine speed fluctuation amounts, instantaneous fuel consumption rates, and smoke densities. The maximum engine speed fluctuation amounts correspond one-to-one with the sets of variation curves, the instantaneous fuel consumption rates correspond one-to-one with the sets of variation curves, and the smoke densities correspond one-to-one with the sets of variation curves. The cut-in state is the state of the sequential supercharging system during the process from the moment when both the exhaust valve and the intake valve are opened until the moment when both the exhaust valve and the intake valve reach the maximum opening degree. The maximum engine speed fluctuation amount is the maximum value of the difference between the engine speed in the cut-in state and the engine speed before sequential supercharging. The instantaneous fuel consumption rate is the instantaneous fuel consumption rate of the engine in the cut-in state, and the smoke density is the amount of soot discharged by the engine in the cut-in state; Evaluating according to the maximum engine speed fluctuation amount, the instantaneous fuel consumption rate, and the smoke density to determine a first target variation curve and a second target variation curve. The first target variation curve is the first variation curve corresponding to the minimum maximum engine speed fluctuation amount, the instantaneous fuel consumption rate being within a first predetermined range, and the smoke density being within a second predetermined range. The second target variation curve is the second variation curve corresponding to the minimum maximum engine speed fluctuation amount, the instantaneous fuel consumption rate being within a first predetermined range, and the smoke density being within a second predetermined range; Controlling the exhaust valve to open according to the first target variation curve and controlling the intake valve to open according to the second target variation curve.

2. The method according to claim 1, wherein Controlling the opening of the exhaust valve and the intake valve according to each set of variation curves to make the sequential supercharging system enter the cut-in state, and obtaining a plurality of maximum engine speed fluctuation amounts, instantaneous fuel consumption rates, and smoke densities of the engine, including: A first control step of controlling the exhaust valve to open according to the first variation curve and controlling the intake valve to open according to the second variation curve to make the sequential supercharging system enter the cut-in state; A first obtaining step of obtaining the maximum engine speed fluctuation amount, the instantaneous fuel consumption rate, and the smoke density when the sequential supercharging system is in the cut-in state; Repeating the control step and the obtaining step at least once in sequence until the maximum engine speed fluctuation amounts, the instantaneous fuel consumption rates, and the smoke densities corresponding to all the sets of variation curves are obtained.

3. The method according to claim 1, wherein Before controlling the exhaust valve to open according to the first target variation curve and controlling the intake valve to open according to the second target variation curve, the method further includes: Obtain a first response duration and a second response duration, where the first response duration is the duration consumed for the exhaust valve to open according to the first target change curve, and the second response duration is the duration consumed for the intake valve to open according to the second target change curve; Generate a first response duration set according to the first response duration, and generate a second response duration set according to the second response duration. The ratio of the response durations in the first response duration set to the first response duration is within a third predetermined range, and the ratio of the response durations in the second response duration set to the second response duration is within a fourth predetermined range; Generate a plurality of response duration groups according to the first response duration set and the second response duration set. One response duration group includes a first response duration and a second response duration; Control the exhaust valve and the intake valve to open according to each of the response duration groups, so that the controlled supercharger enters the cut-in state, and obtain a plurality of maximum rotational speed fluctuation amounts, the instantaneous fuel consumption rate, and the smoke density of the engine. The maximum rotational speed fluctuation amount corresponds to the response duration group one by one, the instantaneous fuel consumption rate corresponds to the response duration group one by one, and the smoke density corresponds to the response duration group one by one; Based on the comprehensive evaluation of the maximum rotational speed fluctuation amount, the instantaneous fuel consumption rate, and the smoke density, determine a first target response duration and a second target response duration. The first target response duration is the first response duration corresponding to the minimum maximum rotational speed fluctuation amount, the instantaneous fuel consumption rate being within a fifth predetermined range, and the smoke density being within a sixth predetermined range. The second target response duration is the second response duration corresponding to the minimum maximum rotational speed fluctuation amount, the instantaneous fuel consumption rate being within a fifth predetermined range, and the smoke density being within a sixth predetermined range.

4. The method according to claim 3, characterized in that Controlling the exhaust valve and the intake valve to open according to each of the response duration groups, so that the controlled supercharger enters the cut-in state, and obtaining a plurality of maximum rotational speed fluctuation amounts, the instantaneous fuel consumption rate, and the smoke density of the engine, includes: A second control step of controlling the exhaust valve to open according to the first response duration and controlling the intake valve to open according to the second response duration, so that the sequential supercharging system enters the cut-in state; A second obtaining step of obtaining the maximum rotational speed fluctuation amount, the instantaneous fuel consumption rate, and the smoke density when the sequential supercharging system is in the cut-in state; Repeat the control step and the obtaining step at least once in sequence until the maximum rotational speed fluctuation amount, the instantaneous fuel consumption rate, and the smoke density corresponding to all the response duration groups are obtained.

5. The method according to claim 3, wherein Controlling the exhaust valve to open according to the first target change curve and controlling the intake valve to open according to the second target change curve includes: According to the first target response duration, correct the first target change curve to obtain a first corrected change curve, and the response duration of the first corrected change curve is the first target response duration; According to the second target response duration, correct the second target change curve to obtain a second corrected change curve, and the response duration of the second corrected change curve is the second target response duration; Control the exhaust valve to open according to the first corrected change curve, and control the intake valve to open according to the second corrected change curve.

6. The method according to claim 3, wherein Before controlling the exhaust valve to open according to the first target change curve and controlling the intake valve to open according to the second target change curve, the method further includes: Obtain a first correction coefficient, a second correction coefficient, and an original delay duration. The first correction coefficient is the coefficient corresponding to the first target response duration, the second correction coefficient is the coefficient corresponding to the second target response duration, the original delay duration is the time interval between the opening time of the exhaust valve and the opening time of the intake valve, and the first correction coefficient and the second correction coefficient are obtained from a calibration experiment; Calculate a corrected delay duration according to the first correction coefficient and the first target response duration, the second correction coefficient and the second target response duration, and the original delay duration; Control the intake valve to open at a target time, where the target time is a time after the opening time of the exhaust valve and is separated from the opening time by the corrected delay duration.

7. The method according to any one of claims 1 to 6, characterized in that, The intake valve includes a fuel intake valve and an air intake valve. Controlling the intake valve to open according to the second target change curve includes: Controlling the air intake valve to open after the fuel intake valve opens.

8. A control device for a sequential supercharging system, characterized in that, The sequential supercharging system includes a plurality of controlled superchargers connected in parallel. The controlled supercharger includes an exhaust valve and an intake valve. The control device includes: A first generating unit for generating a plurality of change curve groups. One change curve group includes a first change curve and a second change curve. The first change curve is a change curve of the opening degree of the exhaust valve of the controlled supercharger changing with time, and the second change curve is a change curve of the opening degree of the intake valve of the controlled supercharger changing with time; A first obtaining unit for controlling the exhaust valve and the intake valve to open according to each change curve group, so that the sequential supercharging system enters a cut-in state, and obtaining a plurality of maximum engine speed fluctuations, instantaneous fuel consumption rates, and smoke densities of the engine. The maximum engine speed fluctuations correspond one-to-one with the change curve groups, the instantaneous fuel consumption rates correspond one-to-one with the change curve groups, the smoke densities correspond one-to-one with the change curve groups. The cut-in state is the state of the sequential supercharging system during the process from when both the exhaust valve and the intake valve are in the open state until they reach the maximum opening degree. The maximum engine speed fluctuation is the maximum value of the difference between the engine speed in the cut-in state and the engine speed before sequential supercharging, the instantaneous fuel consumption rate is the instantaneous fuel consumption rate of the engine in the cut-in state, and the smoke density is the amount of soot discharged by the engine in the cut-in state; A first determination unit is configured to perform an evaluation based on the maximum rotational speed fluctuation amount, the instantaneous fuel consumption rate, and the smoke density, and determine a first target change curve and a second target change curve. The first target change curve is the first change curve corresponding to the minimum maximum rotational speed fluctuation amount, the instantaneous fuel consumption rate being within a first predetermined range, and the smoke density being within a second predetermined range. The second target change curve is the second change curve corresponding to the minimum maximum rotational speed fluctuation amount, the instantaneous fuel consumption rate being within a first predetermined range, and the smoke density being within a second predetermined range. A first control unit is configured to control the exhaust valve to open according to the first target change curve and control the intake valve to open according to the second target change curve.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein when the program runs, it controls the device where the computer-readable storage medium is located to execute the method according to any one of claims 1 to 7.

10. A vehicle, characterized in that, Comprising: An engine, one or more processors, a memory, and one or more programs, wherein the engine includes a sequential supercharging system, the sequential supercharging system includes a plurality of parallel controlled superchargers, the controlled supercharger includes an exhaust control valve and an intake control valve, the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include instructions for executing the method according to any one of claims 1 to 7.

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