Air compressor load rate evaluation and injection control method and device of auxiliary pressurization system

Abstract

The invention provides an air compressor load rate evaluation method and device and an injection control method and device for an auxiliary pressurization system. The air compressor load rate evaluation method comprises the steps that the state of an air compressor is determined based on the pressure of an air storage tank of a whole vehicle; the states of the air compressor comprise an inflating state, a drying regeneration state and an internal unloading state; when the state of the air compressor is a dry regeneration state, the recent inflation state time and the recent unloading state time of the air compressor are standardized, and the standardized recent inflation state time and the standardized recent unloading state time are obtained; and based on the standardized recent inflation state time and the standardized recent unloading state time, a first load rate of the air compressor in the inflation state and a second load rate of the air compressor in the inner unloading state are determined. According to the method, active control over the load rate of the air compressor is achieved, the reliability and safety of the vehicle in the running process are improved, a large amount of historical data do not need to be stored, and the evaluation efficiency of the air pressure load rate is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of engine air intake supercharging, and in particular to an air compressor load rate evaluation and injection control method and device for an auxiliary supercharging system. Background Art

[0002] The current engine supercharging system usually adopts exhaust gas turbocharging technology, which is a technology that uses the exhaust gas generated by the engine to drive the compressor. The purpose of supercharging is to increase the engine intake without increasing the engine displacement, increase the engine equivalent compression ratio, and thus increase the engine power density and torque density. However, the turbocharged engine has insufficient boost pressure at low speeds due to insufficient exhaust gas capacity, which limits the increase in fuel injection and causes poor low-speed torque performance, which is not conducive to the power performance of the car. In addition, the turbocharger has aerodynamic lag, which leads to insufficient intake volume under dynamic engine conditions and slow dynamic response of the engine.

[0003] Therefore, the prior art proposes an auxiliary boost system to improve the aerodynamic lag of the turbocharger and the problem of insufficient low-speed air intake, thereby improving engine performance. However, the load rate of the air compressor in the prior art is designed redundantly and is not actively controlled. Ensuring the load rate of the air compressor through redundant design will result in a low load rate of the air compressor during normal vehicle driving and low equipment utilization; after the introduction of the auxiliary injection system, the load of the air compressor will fluctuate more with changes in operating conditions, and the continuous high load of the air compressor will cause the air compressor to fail, which will cause the collapse of the compressed air system.

[0004] Therefore, there is an urgent need to provide an air compressor load rate assessment and injection control method and device for an auxiliary boost system, which can be used to achieve rapid and active control of the air compressor load rate and ensure the safety of the vehicle during driving. Summary of the invention

[0005] In view of this, it is necessary to provide an air compressor load rate evaluation and injection control method and device for an auxiliary boost system to solve the technical problem in the prior art that the air compressor load rate is not actively controlled, resulting in lower safety of the vehicle during driving.

[0006] On the one hand, in order to solve the above technical problems, the present invention provides an air compressor load rate evaluation method for an auxiliary supercharging system, wherein the auxiliary supercharging system comprises an air compressor, a vehicle air storage tank and an auxiliary injection control valve, wherein the air compressor provides compressed air to the vehicle air storage tank, and the auxiliary injection control valve injects the compressed air into the engine, and the method comprises: Determine the state of the air compressor based on the pressure of the vehicle air tank; the state of the air compressor includes an inflation state, a dry regeneration state, and an internal unloading state; When the state of the air compressor is the dry regeneration state, the recent inflation state time and the recent unloading state time of the air compressor are normalized to obtain the normalized recent inflation state time and the normalized recent unloading state time; A first load rate of the air compressor in the inflation state and a second load rate in the internal unloading state are determined based on the normalized recent inflation state time and the normalized recent internal unloading state time.

[0007] In a possible implementation, determining the first load rate of the air compressor in the inflating state based on the normalized recent inflating state time and the normalized recent unloading state time includes: Determine an inflation sampling time, and determine multiple groups of first state time of the air compressor in an inflation state based on the inflation sampling time; each group of the first state time includes a first recent inflation state time and a first recent unloading state time; The first state time of the first recent inflation state time and the first recent unloading state time are calculated, and the ratio of the first recent inflation state time and the first state time is used as the first load rate.

[0008] In a possible implementation, the first recent unloading state time is:

[0009] The first recent inflation state time is:

[0010] In the formula, The first unloading state time in the near future at the next inflation sampling moment; The first recent unloading state time at the current inflation sampling moment; The first recent inflation state time at the next inflation sampling moment; The first recent inflation state time at the current inflation sampling moment; It is the time difference between the next inflation sampling time and the current inflation sampling time.

[0011] In a possible implementation, determining the second load rate of the air compressor in the internal unloading state based on the normalized recent inflation state time and the normalized recent internal unloading state time includes: Determine an internal unloading sampling time, and determine multiple groups of second state time of the air compressor in the internal unloading state based on the internal unloading sampling time; each group of the second state time includes a second recent inflation state time and a second recent internal unloading state time; The second state time of the second recent inflation state time and the second recent unloading state time is calculated, and the ratio of the second recent inflation state time and the second state time is used as the second load rate.

[0012] In a possible implementation, the second recent inflation state time is:

[0013] The second near-term unloading state time is:

[0014] In the formula, The second most recent inflation state time of the next internal unloading sampling moment; The second most recent inflation state time of the current internal unloading sampling moment; is the time difference between the next internal unloading sampling time and the current internal unloading sampling time; The second most recent internal unloading state time of the next internal unloading sampling moment; It is the second most recent internal unloading state time of the current internal unloading sampling moment.

[0015] In a possible implementation, the method further includes: When the vehicle equipped with the auxiliary boost system is powered on, the recent initial value of the inflation state time and the recent initial value of the internal unloading state time are normalized to obtain the initial inflation state time and the initial internal unloading state time.

[0016] In a possible implementation, the initial inflation state time is:

[0017] The initial internal unloading state time is:

[0018] In the formula, It is the initial pumping state time; is the initial value of the recent load factor; Define values ​​for normalized time; is the initial internal unloading state time.

[0019] On the other hand, the present invention also provides an auxiliary injection control method of an auxiliary boost system, comprising: Determine the air compressor load rate based on the air compressor load rate evaluation method of the auxiliary boost system; Obtaining the airflow state of the engine intake pipe, the airflow state of the exhaust pipe, the injection and power requirements of the electronic control unit to determine the potential benefit of the current auxiliary injection; Determining a control parameter of an auxiliary injection control valve based on the air compressor load rate and the potential benefit, and performing auxiliary injection based on the control parameter; The method for evaluating the load rate of an air compressor of an auxiliary supercharging system is the method for evaluating the load rate of an air compressor of an auxiliary supercharging system described in any one of the possible implementations described above.

[0020] On the other hand, the present invention also provides an air compressor load rate evaluation device for an auxiliary supercharging system, the auxiliary supercharging system comprising an air compressor, a vehicle air storage tank and an auxiliary injection control valve, the air compressor provides compressed air to the vehicle air storage tank, the auxiliary injection control valve injects the compressed air into the engine, and the device comprises: An air compressor state determination unit, used to determine the state of the air compressor based on the pressure of the vehicle air storage tank; the air compressor state includes an inflation state, a dry regeneration state, and an internal unloading state; A state time normalization unit, used for normalizing the recent inflation state time and the recent unloading state time of the air compressor when the state of the air compressor is the dry regeneration state, to obtain the normalized recent inflation state time and the normalized recent unloading state time; The load rate evaluation unit is used to determine a first load rate of the air compressor in the inflation state and a second load rate in the internal unloading state based on the normalized recent inflation state time and the normalized recent internal unloading state time.

[0021] On the other hand, the present invention also provides an auxiliary injection control device of an auxiliary boost system, comprising: An air compressor load rate determination unit, used to determine the air compressor load rate based on an air compressor load rate evaluation method of an auxiliary boost system; A potential benefit determination unit, used for obtaining the airflow state of the engine intake pipe, the airflow state of the exhaust pipe, the injection and power requirements of the electronic control unit to determine the potential benefit of the current auxiliary injection; an auxiliary injection unit, configured to determine a control parameter of an auxiliary injection control valve based on the air compressor load rate and the potential benefit, and perform auxiliary injection based on the control parameter; The method for evaluating the load rate of an air compressor of an auxiliary supercharging system is the method for evaluating the load rate of an air compressor of an auxiliary supercharging system described in any one of the possible implementations described above.

[0022] The beneficial effects of the present invention are as follows: the air compressor load rate evaluation method of the auxiliary boost system provided by the present invention first determines the air compressor state based on the pressure of the vehicle's air tank. When the air compressor state is in a dry regeneration state, the recent inflation state time and the recent unloading state time of the air compressor are standardized. Then, based on the standardized recent inflation state time and the standardized recent unloading state time, the first load rate of the air compressor in the inflation state and the second load rate in the unloading state can be determined. The air compressor load rate is controlled by the first load rate and the second load rate, thereby realizing active control of the air compressor load rate and ensuring the adaptability of the air compressor load rate to the actual driving conditions, thereby improving the reliability and safety of the vehicle during driving.

[0023] Furthermore, the present invention normalizes the recent inflation state time and the recent unloading state time in each air compressor cycle (inflation-drying regeneration-internal unloading), that is, the air compressor load is evaluated / determined using the data within an air compressor cycle, without the need to use a large amount of historical data or to store a large amount of historical data, so that it can be integrated in the auxiliary injection controller and used directly online, thereby improving the applicability of this method and the evaluation efficiency of the air compressor load rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic structural diagram of an embodiment of the auxiliary boosting system provided by the present invention; Figure 2 A schematic flow chart of an embodiment of a method for evaluating the load rate of an air compressor of an auxiliary boosting system provided by the present invention; Figure 3 For the present invention Figure 2 A schematic diagram of an embodiment of determining the first load rate in step S203; Figure 4 For the present invention Figure 2 A schematic diagram of an embodiment of determining the second load rate in step S203; Figure 5 A schematic flow chart of an embodiment of an auxiliary injection control method of an auxiliary boost system provided by the present invention; Figure 6 A schematic structural diagram of an embodiment of an air compressor load rate evaluation device for an auxiliary boosting system provided by the present invention; Figure 7A schematic structural diagram of an embodiment of an auxiliary injection control device of an auxiliary boost system provided by the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0027] It should be understood that the schematic drawings are not drawn to scale. The flowchart used in the present invention shows the operations implemented according to some embodiments of the present invention. It should be understood that the operations of the flowchart can be implemented out of order, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art, under the guidance of the content of the present invention, can add one or more other operations to the flowchart, and can also remove one or more operations from the flowchart. Some of the block diagrams shown in the accompanying drawings are functional entities, which do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor systems and / or microcontroller systems.

[0028] Reference to an "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0029] The present invention provides an air compressor load rate evaluation and injection control method and device for an auxiliary supercharging system. Before introducing the specific embodiments, the auxiliary supercharging system is first introduced. Figure 1 As shown, the auxiliary supercharging system includes an air compressor 11, a vehicle air tank 4 and an auxiliary injection control valve 10. The air compressor 11 provides compressed air to the vehicle air tank 4, and the auxiliary injection control valve 10 injects the compressed air into the engine 1. The auxiliary supercharging system provides auxiliary compressed air for the turbocharging circuit, which is composed of a turbocharger 13 and an intake air path.

[0030] The embodiment of the present invention realizes the coordinated operation of the vehicle air storage tank 4, the auxiliary injection control valve 10, and the turbocharger 13 by setting an auxiliary supercharging system. When the engine is in a low-speed and high-load condition or a medium-to-low-load transient condition, the engine 1 has insufficient air intake due to the hysteresis characteristic of the turbocharger 13. At this time, the auxiliary injection control valve 10 is used to supplement additional air to the engine intake pipeline, thereby increasing the engine intake volume, optimizing the engine combustion process, and improving the problems of aerodynamic hysteresis of the turbocharger 13 and insufficient air intake at low speed, thereby improving the engine performance.

[0031] It should be noted that: In order to further improve the boost performance, such as Figure 1 As shown, the auxiliary boost system also includes a vehicle air tank pressure sensor 9, a multi-circuit protection valve 5, a controller 6, an air dryer 7 and an intercooler 12.

[0032] The auxiliary supercharging system and the turbocharging system are both arranged in a commercial vehicle. The commercial vehicle further comprises a clutch 2 and a gearbox 3. Both ends of the clutch 2 are connected to the engine 1 and the gearbox 3 respectively.

[0033] Based on the auxiliary boosting system, an embodiment of the present invention provides an air compressor load rate evaluation method for the auxiliary boosting system, such as Figure 2 As shown in the figure, the air compressor load rate evaluation method of the auxiliary boost system includes: S201, determining the state of the air compressor based on the pressure of the vehicle's air storage tank; the air compressor state includes an inflation state, a drying and regeneration state, and an internal unloading state; S202, when the state of the air compressor is the dry regeneration state, normalizing the recent inflation state time and the recent unloading state time of the air compressor to obtain the normalized recent inflation state time and the normalized recent unloading state time; S203, determining a first load rate of the air compressor in the inflation state and a second load rate in the internal unloading state based on the normalized recent inflation state time and the normalized recent internal unloading state time.

[0034] The pressure of the vehicle gas tank in step S201 can be based on Figure 1 The vehicle gas tank pressure sensor is obtained.

[0035] Furthermore, since the pressure of the vehicle's gas tank is affected not only by the state of the air compressor, but also by the ambient temperature and the noise of the sensor acquisition signal, in order to improve the accuracy of the vehicle's gas tank pressure, the pressure obtained by the vehicle's gas tank pressure sensor can be filtered and used as the final pressure.

[0036] Specifically, the state of the air compressor is determined based on the pressure of the vehicle's air tank. Specifically, the pressure change trend is determined based on the pressure of the vehicle's air tank. When the pressure change trend is rising, the air compressor state is an inflation state; when the pressure change trend is falling, and the falling rate is greater than the preset falling rate, the air compressor state is a dry regeneration state; when the pressure change trend is falling, and the falling rate is less than or equal to the preset falling rate, the air compressor state is an internal unloading state.

[0037] It should be understood that the internal unloading state includes three stages: post-processing air consumption, brake air consumption, and engine intake auxiliary injection. The inflation state, dry regeneration state, and internal unloading state are cyclic processes. Each cyclic process is called an air compressor cycle.

[0038] In a specific embodiment of the present invention, the recent inflation state time is normalized for:

[0039] Normalize the unloading state time in the near future for:

[0040] In the formula, is the space machine load rate at the drying and regeneration time; Defines a value for normalized time.

[0041] Compared with the prior art, the air compressor load rate evaluation method of the auxiliary boost system provided in the embodiment of the present invention first determines the air compressor state based on the pressure of the vehicle's air tank. When the air compressor state is in a dry regeneration state, the recent inflation state time and the recent unloading state time of the air compressor are standardized. Then, based on the standardized recent inflation state time and the standardized recent unloading state time, the first load rate of the air compressor in the inflation state and the second load rate in the unloading state can be determined. The air compressor load rate is controlled by the first load rate and the second load rate, thereby achieving active control of the air compressor load rate and ensuring the adaptability of the air compressor load rate to the actual driving conditions, thereby improving the reliability and safety of the vehicle during driving.

[0042] Furthermore, in the embodiment of the present invention, the recent inflation state time and the recent unloading state time are normalized within each air compressor cycle (inflation-drying regeneration-internal unloading), that is: the air compressor load is evaluated / determined using the data within an air compressor cycle, without the need to use a large amount of historical data or to store a large amount of historical data, so that it can be integrated in the auxiliary injection controller and used directly online, thereby improving the applicability of this method and the evaluation efficiency of the air compressor load rate.

[0043] In some embodiments of the present invention, Figure 3 As shown, determining the first load rate in step S203 includes: S301, determining an inflation sampling time, and determining multiple groups of first state time of the air compressor in an inflation state based on the inflation sampling time; each group of first state time includes a first recent inflation state time and a first recent unloading state time; S302, calculating the first state time of the first recent inflation state time and the first recent unloading state time, and taking the ratio of the first recent inflation state time and the first state time as the first load rate.

[0044] Among them, multiple groups of first state time are rolling predictions, that is: based on the first recent inflation state time and the first recent unloading state time at the previous moment, the first recent inflation state time and the first recent unloading state time at the current moment are determined; based on the first recent inflation state time and the first recent unloading state time at the current moment, the first recent inflation state time and the first recent unloading state time at the next moment are predicted.

[0045] The embodiment of the present invention determines the first recent inflation state time and the first recent unloading state time at the current moment based on the first recent inflation state time and the first recent unloading state time at the previous moment by means of rolling prediction, thereby further reducing the amount of data for determining the first recent inflation state time and the first recent unloading state time at the current moment, thereby further improving the efficiency of determining the load rate at the current moment and further improving the timeliness of the auxiliary injection.

[0046] In a specific embodiment of the present invention, the first recent unloading state time is:

[0047] The first recent inflating status time is:

[0048] In the formula, The first unloading state time in the near future at the next inflation sampling moment; The first recent unloading state time at the current inflation sampling moment; The first recent inflation state time at the next inflation sampling moment; The first recent inflation state time at the current inflation sampling moment; It is the time difference between the next inflation sampling time and the current inflation sampling time.

[0049] Likewise, if Figure 4 As shown, determining the second load rate in step S203 includes: S401, determining an internal unloading sampling time, and determining multiple groups of second state time of the air compressor in the internal unloading state based on the internal unloading sampling time; each group of second state time includes a second recent inflation state time and a second recent internal unloading state time; S402, calculating a second state time of a second recent inflation state time and a second recent unloading state time, and taking the ratio of the second recent inflation state time and the second state time as a second load rate.

[0050] Like the inflation state, multiple groups of second state time are also rolling predictions, that is: the second recent inflation state time and the second recent unloading state time at the previous moment are determined based on the second recent inflation state time and the second recent unloading state time at the previous moment.

[0051] In a specific embodiment of the present invention, the second recent inflation state time is:

[0052] The unloading state time in the second near future is:

[0053] In the formula, The second most recent inflation state time of the next internal unloading sampling moment; The second most recent inflation state time of the current internal unloading sampling moment; is the time difference between the next internal unloading sampling time and the current internal unloading sampling time; The second most recent internal unloading state time of the next internal unloading sampling moment; It is the second most recent internal unloading state time of the current internal unloading sampling moment.

[0054] It should be noted that the order of the air compressor cycle is: drying regeneration, internal unloading, and inflation. Therefore, the first recent inflation state time and the first recent unloading state time of the inflation state are continuous with the second recent inflation state time and the second recent unloading state time, that is: the state time of the internal unloading state and the inflation state is determined based on the standardized state time of the drying regeneration state, and the load rate is calculated based on this.

[0055] Since the inflation state time and internal unloading state time at each of the above moments are rolling predictions, that is, an initial inflation state time and an initial internal unloading state time are required. In a specific embodiment of the present invention, the initial inflation state time and the initial internal unloading state time are the vehicle power-on time. To ensure the accuracy of the subsequent state time, in some embodiments of the present invention, before step S101, the following is further included: When the vehicle equipped with the auxiliary boost system is powered on, the recent initial value of the inflation state time and the recent initial value of the internal unloading state time are normalized to obtain the initial inflation state time and the initial internal unloading state time.

[0056] Specifically, the initial inflation state time is:

[0057] The initial internal unloading state time is:

[0058] In the formula, It is the initial pumping state time; is the initial value of the recent load factor; Define values ​​for normalized time; is the initial internal unloading state time.

[0059] In summary, the air compressor load rate evaluation method for the auxiliary boost system provided in the embodiment of the present invention identifies the state of the air compressor by the pressure of the vehicle's air tank, designs a regular and standardized recent average load rate method to evaluate the load rate of the air compressor, and realizes active control of the air compressor load rate. In addition, it avoids the data storage problem of short-term load rate calculation for the non-fixed periodic working state of the air compressor, thereby improving the accuracy and determination efficiency of the air compressor load rate.

[0060] Since the air compressor load rate is determined in order to accurately determine the injection timing of the auxiliary injection, if only the air compressor load rate is used as a consideration for controlling the auxiliary injection, the economy and responsiveness of the whole vehicle cannot be taken into account. Therefore, the embodiment of the present invention also provides an auxiliary injection control method for an auxiliary supercharging system, such as Figure 5 As shown, the auxiliary injection control method of the auxiliary boost system includes: S501, determining the air compressor load rate based on the air compressor load rate evaluation method of the auxiliary boost system; S502, obtaining the airflow state of the engine intake pipe, the airflow state of the exhaust pipe, the injection and power requirements of the electronic control unit to determine the potential benefit of the current auxiliary injection; S503, determining control parameters of the auxiliary injection control valve based on the air compressor load rate and potential benefits, and performing auxiliary injection based on the control parameters; The method for evaluating the load rate of an air compressor of an auxiliary supercharging system is the method for evaluating the load rate of an air compressor of an auxiliary supercharging system in any one of the above embodiments.

[0061] It should be noted that step S503 is specifically as follows: when the air compressor load rate is relatively high in the near future, only auxiliary injection with higher potential benefits is performed to control the engine load rate to improve the economy of the whole vehicle; when the air compressor load rate is relatively low in the near future, auxiliary injection will be performed as much as possible under the premise of potential benefits to further improve the economy and responsiveness of the whole vehicle.

[0062] The embodiment of the present invention determines the control parameters of the auxiliary injection control valve based on the two factors of the air compressor load rate and the potential profit, so that the determined control parameters can take into account both the economy and responsiveness of the entire vehicle.

[0063] It should be noted that the specific mapping relationship between the air compressor load rate, potential revenue and the control parameters of the auxiliary injection control valve can be calibrated based on experiments and is not specifically limited here.

[0064] In order to better implement the air compressor load rate evaluation method of the auxiliary boosting system in the embodiment of the present invention, based on the air compressor load rate evaluation method of the auxiliary boosting system, the embodiment of the present invention also provides an air compressor load rate evaluation device for the auxiliary boosting system, such as Figure 6 As shown, the air compressor load rate evaluation device 600 of the auxiliary boost system includes: The air compressor state determination unit 601 is used to determine the state of the air compressor based on the pressure of the vehicle air storage tank; the air compressor state includes the inflation state, the drying regeneration state and the internal unloading state; The state time normalization unit 602 is used to normalize the recent inflation state time and the recent unloading state time of the air compressor when the air compressor state is in the dry regeneration state, so as to obtain the normalized recent inflation state time and the normalized recent unloading state time; The load rate evaluation unit 603 is used to determine a first load rate of the air compressor in the inflation state and a second load rate in the internal unloading state based on the normalized recent inflation state time and the normalized recent internal unloading state time.

[0065] It should be noted that the air compressor load rate assessment device 600 for the auxiliary boosting system provided in the above embodiment can implement the technical solution described in the above embodiment of the air compressor load rate assessment method for the auxiliary boosting system. The specific implementation principles or specific implementation details of the above modules or units can refer to the corresponding contents in the above embodiment of the air compressor load rate assessment method for the auxiliary boosting system, which will not be described one by one here.

[0066] In order to better implement the auxiliary injection control method of the auxiliary supercharging system in the embodiment of the present invention, based on the auxiliary injection control method of the auxiliary supercharging system, the embodiment of the present invention also provides an auxiliary injection control device of the auxiliary supercharging system, such as Figure 7As shown, the auxiliary injection control device 700 of the auxiliary boost system includes: An air compressor load factor determination unit 701, configured to determine an air compressor load factor based on an air compressor load factor evaluation method of an auxiliary boost system; A potential benefit determination unit 702 is used to obtain the airflow state of the engine intake pipe, the airflow state of the exhaust pipe, the injection and power requirements of the electronic control unit to determine the potential benefit of the current auxiliary injection; The auxiliary injection unit 703 is used to determine the control parameters of the auxiliary injection control valve based on the air compressor load rate and the potential benefit, and perform auxiliary injection based on the control parameters; The method for evaluating the load rate of an air compressor of an auxiliary supercharging system is the method for evaluating the load rate of an air compressor of an auxiliary supercharging system in any one of the above embodiments.

[0067] It should be noted that the auxiliary injection control device 700 of the auxiliary boost system provided in the above embodiment can implement the technical solution described in the auxiliary injection control method embodiment of the above auxiliary boost system. The specific implementation principles or specific implementation details of the above modules or units can refer to the corresponding contents in the auxiliary injection control method embodiment of the auxiliary boost system, which will not be described one by one here.

[0068] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware (such as a processor, a controller, etc.) through a computer program, and the computer program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0069] The above is a detailed introduction to the air compressor load rate evaluation, injection control method and device of the auxiliary boost system provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for technical personnel in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for evaluating the load rate of an air compressor in an auxiliary boost system, characterized in that: The auxiliary boost system includes an air compressor, a vehicle air tank and an auxiliary injection control valve, the air compressor provides compressed air to the vehicle air tank, and the auxiliary injection control valve injects the compressed air into the engine, and the method includes: Determine the state of the air compressor based on the pressure of the vehicle air tank; the state of the air compressor includes an inflation state, a dry regeneration state, and an internal unloading state; When the state of the air compressor is the dry regeneration state, the recent inflation state time and the recent unloading state time of the air compressor are normalized to obtain the normalized recent inflation state time and the normalized recent unloading state time; A first load rate of the air compressor in the inflation state and a second load rate in the internal unloading state are determined based on the normalized recent inflation state time and the normalized recent internal unloading state time.

2. The method for evaluating the load rate of an air compressor of an auxiliary boost system according to claim 1, characterized in that: Determining a first load rate of the air compressor in the inflating state based on the normalized recent inflating state time and the normalized recent unloading state time includes: Determine an inflation sampling time, and determine multiple groups of first state time of the air compressor in an inflation state based on the inflation sampling time; each group of the first state time includes a first recent inflation state time and a first recent unloading state time; The first state time of the first recent inflation state time and the first recent unloading state time are calculated, and the ratio of the first recent inflation state time and the first state time is used as the first load rate.

3. The air compressor load rate evaluation method of the auxiliary boost system according to claim 2 is characterized in that: The first recent unloading state time is: The first recent inflation state time is: In the formula, The first unloading state time in the near future at the next inflation sampling moment; The first recent unloading state time at the current inflation sampling moment; The first recent inflation state time at the next inflation sampling moment; The first recent inflation state time at the current inflation sampling moment; It is the time difference between the next inflation sampling time and the current inflation sampling time.

4. The method for evaluating the load rate of an air compressor of an auxiliary boost system according to claim 1, characterized in that: Determining the second load rate of the air compressor in the internal unloading state based on the normalized recent inflation state time and the normalized recent internal unloading state time includes: Determine an internal unloading sampling time, and determine multiple groups of second state time of the air compressor in the internal unloading state based on the internal unloading sampling time; each group of the second state time includes a second recent inflation state time and a second recent internal unloading state time; The second state time of the second recent inflation state time and the second recent unloading state time is calculated, and the ratio of the second recent inflation state time and the second state time is used as the second load rate.

5. The method for evaluating the load rate of an air compressor of an auxiliary boost system according to claim 4, characterized in that: The second recent inflation state time is: The second near-term unloading state time is: In the formula, The second most recent inflation state time of the next internal unloading sampling moment; The second most recent inflation state time of the current internal unloading sampling moment; is the time difference between the next internal unloading sampling time and the current internal unloading sampling time; The second most recent internal unloading state time of the next internal unloading sampling moment; It is the second most recent internal unloading state time of the current internal unloading sampling moment.

6. The method for evaluating the load rate of an air compressor of an auxiliary boost system according to claim 1, characterized in that: The method further comprises: When the vehicle equipped with the auxiliary boost system is powered on, the recent initial value of the inflation state time and the recent initial value of the internal unloading state time are normalized to obtain the initial inflation state time and the initial internal unloading state time.

7. The method for evaluating the load rate of an air compressor of an auxiliary boost system according to claim 6, characterized in that: The initial inflation state time is: The initial internal unloading state time is: In the formula, It is the initial pumping state time; is the initial value of the recent load factor; Define values ​​for normalized time; is the initial internal unloading state time.

8. An auxiliary injection control method of an auxiliary supercharging system, characterized in that: include: Determine the air compressor load rate based on the air compressor load rate evaluation method of the auxiliary boost system; Obtaining the airflow state of the engine intake pipe, the airflow state of the exhaust pipe, the injection and power requirements of the electronic control unit to determine the potential benefit of the current auxiliary injection; Determining a control parameter of an auxiliary injection control valve based on the air compressor load rate and the potential benefit, and performing auxiliary injection based on the control parameter; The method for evaluating the load rate of an air compressor of an auxiliary boosting system is the method for evaluating the load rate of an air compressor of an auxiliary boosting system as described in any one of claims 1 to 7.

9. An air compressor load rate evaluation device for an auxiliary boost system, characterized in that: The auxiliary boost system includes an air compressor, a vehicle air tank and an auxiliary injection control valve. The air compressor provides compressed air to the vehicle air tank, and the auxiliary injection control valve injects the compressed air into the engine. The device includes: An air compressor state determination unit, used to determine the state of the air compressor based on the pressure of the vehicle air storage tank; the air compressor state includes an inflation state, a dry regeneration state, and an internal unloading state; A state time normalization unit, used for normalizing the recent inflation state time and the recent unloading state time of the air compressor when the state of the air compressor is the dry regeneration state, to obtain the normalized recent inflation state time and the normalized recent unloading state time; The load rate evaluation unit is used to determine a first load rate of the air compressor in the inflation state and a second load rate in the internal unloading state based on the normalized recent inflation state time and the normalized recent internal unloading state time.

10. An auxiliary injection control device for an auxiliary supercharging system, characterized in that: include: An air compressor load rate determination unit, used to determine the air compressor load rate based on an air compressor load rate evaluation method of an auxiliary boost system; A potential benefit determination unit, used for obtaining the airflow state of the engine intake pipe, the airflow state of the exhaust pipe, the injection and power requirements of the electronic control unit to determine the potential benefit of the current auxiliary injection; an auxiliary injection unit, configured to determine a control parameter of an auxiliary injection control valve based on the air compressor load rate and the potential benefit, and perform auxiliary injection based on the control parameter; The method for evaluating the load rate of an air compressor of an auxiliary boosting system is the method for evaluating the load rate of an air compressor of an auxiliary boosting system as described in any one of claims 1 to 7.

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