Dual-pressurization system, dual-pressurization control method and vehicle

Abstract

The invention provides a double-supercharging system, a double-supercharging control method and a vehicle, the system comprises a supercharging device, a first air inlet bypass pipeline, a second air inlet bypass pipeline and a controller, and the supercharging device comprises an electric supercharger and a turbocharger which are connected to an air inlet pipeline of an engine; the first air inlet bypass pipeline is connected with the electric supercharger and / or the turbocharger in parallel, the second air inlet bypass pipeline is connected with the supercharging device in parallel, and the controller is used for controlling starting and stopping of the electric supercharger and controlling connection and disconnection of the first air inlet bypass pipeline and the second air inlet bypass pipeline based on the current working condition of the vehicle. Therefore, starting and stopping of the electric supercharger and connection and disconnection of the first air inlet bypass pipeline and the second air inlet bypass pipeline can be adjusted in time according to the working condition change of the vehicle so as to adjust the air inlet amount of the engine, and the response speed of the supercharging device can be effectively increased while the energy consumption of the supercharging device is reduced.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a dual-boost system, a dual-boost control method and a vehicle. Background Art

[0002] With the continuous development of vehicle technology, the requirements for engine power, economy and compactness are becoming higher and higher. Therefore, it is necessary to output the maximum power and torque with the smallest displacement. Increasing the engine intake pressure through a supercharging device is an effective way to improve the engine power, economy and compactness.

[0003] Among them, a turbocharger is usually used to increase the intake pressure of the engine, but there is a problem of turbo lag, especially under low-speed conditions, the pressure of the boosted gas discharged by the turbocharger is relatively low, resulting in insufficient engine intake and difficulty in meeting the power requirements of the vehicle. Therefore, a dual-boost system is usually used to reduce the problem of turbo lag of the turbocharger.

[0004] However, the current dual-supercharging system has the problem of high energy consumption or inability to completely eliminate turbo lag, and thus cannot effectively improve the response speed of the supercharging device. Therefore, it is necessary to provide a dual-supercharging system that can effectively improve the response speed of the supercharging device while reducing the energy consumption of the supercharging device. Summary of the invention

[0005] In order to solve the above technical problems, the present application provides a dual boost system, a dual boost control method and a vehicle to solve the problem in the prior art that it is impossible to effectively improve the response speed of the boost device while reducing the energy consumption of the boost device.

[0006] To achieve the above technical objectives, the present application provides the following technical solutions:

[0007] In a first aspect, an embodiment of the present specification provides a dual supercharging system, including: a supercharging device, a first intake bypass line, a second intake bypass line, and a controller;

[0008] The supercharging device includes an electric supercharger and a turbocharger connected to the air intake line of the engine;

[0009] The first air intake bypass pipeline is connected in parallel with the electric supercharger and / or the turbocharger, and the second air intake bypass pipeline is connected in parallel with the supercharging device;

[0010] The controller is used to control the opening and closing of the electric supercharger and the opening and closing of the first intake bypass line and the second intake bypass line based on the current working condition of the vehicle.

[0011] In one embodiment, a first intake bypass valve is provided on the first intake bypass line, and the first intake bypass valve is used to control the on-off of the first intake bypass line; and a second intake bypass valve is provided on the second intake bypass line, and the second intake bypass valve is used to control the on-off of the second intake bypass line;

[0012] The controller is specifically used for:

[0013] Based on the current operating condition, determining a magnitude relationship between a target air intake volume of the engine and a current air intake volume of the engine;

[0014] The opening and closing of the electric supercharger is controlled based on the size relationship, and the opening and closing of the first intake bypass valve and the second intake bypass valve are controlled based on the size relationship and a connection mode between the electric supercharger and the turbocharger.

[0015] In one embodiment, when the connection mode of the electric supercharger and the turbocharger is a serial connection, the number of the first intake bypass line and the number of the first intake bypass valve are both two, the two first intake bypass valves are respectively arranged on the two first intake bypass lines, and the two first intake bypass lines are respectively connected to the electric supercharger and the turbocharger in parallel.

[0016] In one embodiment, when the connection mode between the electric supercharger and the turbocharger is a serial connection, the controller is specifically configured to:

[0017] If the target intake air amount is greater than the current intake air amount, controlling the second intake bypass valve and the first intake bypass valve away from the engine to close;

[0018] If the target intake air amount is less than the current intake air amount, the first intake bypass valve far from the engine is controlled to open, and the second intake bypass valve and / or the first intake bypass valve close to the engine are controlled to open.

[0019] In one embodiment, when the connection mode between the electric supercharger and the turbocharger is a serial connection, the controller is specifically configured to:

[0020] If the target intake air volume is greater than the current intake air volume, a first intake bypass valve close to the engine is also controlled to open;

[0021] and / or,

[0022] If the target intake air amount is less than the current intake air amount, the second intake bypass valve is controlled to be opened, and the first intake bypass valve close to the engine is controlled to be closed.

[0023] In one embodiment, when the connection mode of the electric supercharger and the turbocharger is parallel connection, the number of the first intake bypass line and the number of the first intake bypass valve are both one, and the first intake bypass line is connected in parallel with the electric supercharger and the turbocharger.

[0024] In one embodiment, when the connection mode between the electric supercharger and the turbocharger is parallel connection, the controller is specifically configured to:

[0025] If the target intake air amount is greater than the current intake air amount, controlling the second intake bypass valve and the first intake bypass valve to be closed;

[0026] If the target intake air amount is less than the current intake air amount, the second intake bypass valve and / or the first intake bypass valve are controlled to open.

[0027] In a second aspect, an embodiment of the present specification provides a dual-boost control method, which is applied to a dual-boost system as described above, and the method includes the following steps performed by the controller:

[0028] The electric supercharger is controlled to be turned on and off based on the current working condition of the vehicle, and the first intake bypass line and the second intake bypass line are controlled to be turned on and off.

[0029] In one embodiment, controlling the on / off of the electric supercharger and controlling the on / off of the first intake bypass line and the second intake bypass line based on the current operating condition of the vehicle includes:

[0030] Based on the current operating condition, determining a magnitude relationship between a target air intake volume of the engine and a current air intake volume of the engine;

[0031] The opening and closing of the electric supercharger is controlled based on the size relationship, and the opening and closing of the first intake bypass valve and the second intake bypass valve are controlled based on the size relationship and a connection mode between the electric supercharger and the turbocharger.

[0032] In a third aspect, an embodiment of the present specification provides a vehicle, comprising: an engine and a dual boost system as described in any one of the above.

[0033] In a fourth aspect, an embodiment of the present specification provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the dual-boost control method as described in any one of the above items is implemented.

[0034] In a fifth aspect, an embodiment of the present specification provides a computer program product or a computer program, wherein the computer program product includes a computer program, and the computer program is stored in a computer-readable storage medium; the processor of the computer device reads the computer program from the computer-readable storage medium, and when the processor executes the computer program, it implements the dual-boost control method as described in any one of the above items.

[0035] It can be seen from the above technical scheme that the embodiment of the present application provides a dual-boosting system, a dual-boosting control method and a vehicle, the system includes a boosting device, a first intake bypass line, a second intake bypass line and a controller, the boosting device includes an electric supercharger and a turbocharger connected to the intake line of the engine, the first intake bypass line is connected in parallel with the electric supercharger and / or the turbocharger, the second intake bypass line is connected in parallel with the boosting device, the controller is used to control the opening and closing of the electric supercharger based on the current working condition of the vehicle and control the opening and closing of the first intake bypass line and the second intake bypass line. On the one hand, the high-voltage power supply of the vehicle can be used to provide driving force for the electric supercharger, and the response speed Fast, so that according to the changes in the working conditions of the vehicle, the electric supercharger can be controlled to start to replenish air for the engine under low-speed conditions such as starting or rapid acceleration, effectively avoiding the influence of turbo lag on the vehicle's dynamic performance, thereby effectively improving the response speed of the supercharging device; on the other hand, according to the changes in the working conditions of the vehicle, when the turbocharger can meet the intake volume demand of the engine, the electric supercharging device can be controlled to be closed, thereby effectively reducing the energy consumption of the supercharging device; on the other hand, the on-off of the first intake bypass pipeline and the second intake bypass pipeline can be controlled according to the changes in the working conditions of the vehicle, so as to quickly adjust the size of the engine's intake volume, further improving the response speed of the supercharging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0037] Figure 1 A schematic structural diagram of a dual boost system provided for an implementation manner of this specification.

[0038] Figure 2 A schematic structural diagram of another dual boost system provided for an embodiment of this specification.

[0039] Figure 3 A connection diagram of an exhaust bypass valve provided for an implementation manner of this specification.

[0040] Figure 4 A connection diagram of an exhaust gas recirculation control valve provided for an implementation manner of this specification.

[0041] Figure 5 A connection diagram of another exhaust gas recirculation control valve provided for an embodiment of this specification.

[0042] Figure 6 A schematic flow chart of a dual boost control method provided for an implementation of this specification. DETAILED DESCRIPTION

[0043] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of this specification shall have the common meanings understood by persons with ordinary skills in the field to which this specification belongs. The words "first", "second" and similar words used in the embodiments of this specification do not indicate any order, quantity or importance, but are only used to avoid confusion of constituent elements.

[0044] Unless the context requires otherwise, throughout the specification, "plurality" means "at least two", and "including" is interpreted as an open, inclusive meaning, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples" or "some examples" are intended to indicate that a particular feature, structure, material or characteristic associated with the embodiment or example is included in at least one embodiment or example of the specification. The schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0045] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this specification.

[0046] Overview

[0047] As described in the background technology, with the continuous development of vehicle technology, the requirements for engine power, economy and compactness of layout are becoming higher and higher. Therefore, it is necessary to output the maximum power and torque with the smallest displacement. Increasing the intake pressure of the engine through a supercharging device is an effective way to improve the engine power, economy and compactness of layout.

[0048] Among them, a turbocharger is usually used to increase the intake pressure of the engine, but there is a problem of turbo hysteresis, especially under low-speed conditions, the pressure of the boosted gas discharged by the turbocharger is relatively low, resulting in insufficient engine intake, and no obvious improvement in power, making it difficult to meet the power requirements of the vehicle. Therefore, a dual-boost system is usually used to reduce the problem of turbo hysteresis of the turbocharger.

[0049] The dual-supercharging system currently used generally includes a dual-turbocharger system and a dual-supercharging system of a supercharger + a turbocharger. Among them, the dual-turbocharger system generally connects two identical turbines in parallel on the exhaust pipe to reduce the inertia by reducing the size of a single turbine, and then drives the turbine to rotate at a high speed through less exhaust to generate sufficient intake pressure, thereby achieving the purpose of reducing turbo hysteresis. However, it can only reduce turbo hysteresis and cannot completely eliminate the problem of turbo hysteresis, thereby failing to effectively improve the response speed of the supercharger. The dual-supercharging system of a supercharger + a turbocharger generally connects a supercharger in series before the turbocharger. The supercharger is directly connected to the crankshaft of the engine through gears. As long as the engine rotates, the supercharger can generate boost pressure, thereby fundamentally eliminating the problem of turbo hysteresis. However, as the engine speed increases, the supercharger consumes more energy, thereby failing to effectively improve the power of the vehicle. Therefore, it is necessary to provide a dual-supercharging system that can effectively improve the response speed of the supercharger while reducing the energy consumption of the supercharger.

[0050] In order to solve the problem that the traditional method cannot effectively improve the response speed of the supercharging device while reducing the energy consumption of the supercharging device, in the technical solution of the present application, the dual supercharging system includes a supercharging device, a first intake bypass line, a second intake bypass line and a controller, the supercharging device includes an electric supercharger and a turbocharger connected to the intake line of the engine, the first intake bypass line is connected in parallel with the electric supercharger and / or the turbocharger, the second intake bypass line is connected in parallel with the supercharging device, the controller is used to control the opening and closing of the electric supercharger based on the current working condition of the vehicle and to control the opening and closing of the first intake bypass line and the second intake bypass line. On the one hand, the high voltage power supply of the vehicle can be used to provide power for the electric supercharger Driving force, fast response speed, so that according to the working condition of the vehicle, the electric supercharger can be controlled to start to replenish air for the engine under low-speed conditions such as starting or rapid acceleration, effectively avoiding the influence of turbo hysteresis on the vehicle's dynamic performance, thereby effectively improving the response speed of the supercharging device; on the other hand, according to the working condition of the vehicle, when the turbocharger can meet the intake volume demand of the engine, the electric supercharging device can be controlled to be closed, thereby effectively reducing the energy consumption of the supercharging device; on the other hand, the first intake bypass line and the second intake bypass line can be controlled to be on and off according to the working condition of the vehicle, so as to quickly adjust the intake volume of the engine, further improving the response speed of the supercharging device.

[0051] Based on the above-mentioned inventive concept, the dual boost system provided in the embodiment of this specification is exemplarily described below.

[0052] Exemplary Systems

[0053] The embodiments of this specification provide a dual boost system, such as Figure 1 or Figure 2 As shown, it includes: a supercharging device, a first intake bypass line 105, a second intake bypass line 107 and a controller (in Figure 1 and Figure 2 are not reflected in the above);

[0054] The supercharging device includes an electric supercharger 103 and a turbocharger 104 connected to an intake pipe 102 of an engine 101;

[0055] The first intake bypass line 105 is connected in parallel with the electric supercharger 103 and / or the turbocharger 104, and the second intake bypass line 107 is connected in parallel with the supercharging device;

[0056] The controller is used to control the opening and closing of the electric supercharger 103 and the opening and closing of the first intake bypass line 105 and the second intake bypass line 107 based on the current working condition of the vehicle.

[0057] Specifically, the supercharging device is used to increase the intake pressure of the engine 101. The supercharging device may include an electric supercharger 103 and a turbocharger 104. The connection mode of the electric supercharger 103 and the turbocharger 104 may be a serial connection (eg, Figure 1 as shown) or in parallel (as Figure 2 As shown), it can be specifically set according to actual needs. For example, when the electric supercharger 103 and the turbocharger 104 are connected in series, the electric supercharger 103 is large in size, which makes it difficult to arrange the engine room, but the control logic is relatively simple; when the electric supercharger 103 and the turbocharger 104 are connected in parallel, the electric supercharger 103 and the turbocharger 104 provide pressurized gas for the engine 101 together. The electric supercharger 103 is small in size and easy to arrange, but the electric supercharger 103 and the turbocharger 104 need to produce the same pressure ratio to stably supply gas to the engine 101, and the control logic is relatively complex.

[0058] The electric supercharger 103 may include an electric motor 1031 and a first compressor 1032. The first compressor 1032 may be arranged on the intake pipe 102 of the engine 101. The electric motor 1031 may be connected to the first compressor 1032 via a first connecting shaft 1033. The electric motor 1031 may drive the first compressor 1032 to generate pressurized gas during rotation. The pressurized gas may enter the engine 101 via the intake pipe 102 to improve the combustion efficiency and power output of the engine 101. The speed of the electric motor 1031 may be controlled by a controller to adjust the flow rate and pressure ratio of the first compressor 1032. The electric motor 1031 can be connected to the high-voltage power supply 109 of the vehicle so that the high-voltage power supply 109 can be used to power the electric motor 1031. As a result, the electric supercharger 103 can be timely controlled to start and replenish air for the engine 101 under low-speed conditions such as starting or rapid acceleration. The response speed is fast, and the influence of turbo lag and the like on the vehicle's dynamic performance is effectively avoided, thereby effectively improving the response speed of the supercharging device. At the same time, when the turbocharger 104 can meet the air intake demand of the engine 101, the electric supercharger 103 can be controlled to be closed to reduce the energy consumption of the electric supercharger 103.

[0059] The turbocharger 104 may include a turbine 1041 and a second compressor 1042. The turbine 1041 may be arranged on the exhaust pipe 110 of the engine 101, and the second compressor 1042 may be arranged on the intake pipe 102 of the engine 101. The turbine 1041 may be connected to the second compressor 1042 via a second connecting shaft 1043. The high-temperature exhaust gas discharged from the engine 101 may drive the turbine 1041 to rotate through the exhaust pipe 110 to drive the second compressor 1042 to work and generate pressurized gas. The pressurized gas may enter the engine 101 through the intake pipe 102 to improve the combustion efficiency and power output of the engine 101.

[0060] The first intake bypass line 105 may be connected in parallel with the first compressor 1032 in the electric supercharger 103 and / or the second compressor 1042 in the turbocharger 104 .

[0061] In implementation, such as Figure 1 As shown, when the connection mode of the electric supercharger 103 and the turbocharger 104 is a serial connection, the first compressor 1032 and the second compressor 1042 are connected in series to the intake pipe 102, and the number of the first intake bypass pipes 105 is two, and the two first intake bypass pipes 105 are respectively connected in parallel to the electric supercharger 103 and the turbocharger 104. For example, for the first intake bypass pipe 105 connected in parallel to the first compressor 1032, the two ends of the first intake bypass pipe 105 are respectively connected to the intake pipe 102 at the intake end and the exhaust end of the first compressor 1032, and the first intake bypass pipe 105 is connected to the intake pipe 102 of the engine 101. For the first intake bypass pipeline 105 connected in parallel with the second compressor 1042, both ends of the first intake bypass pipeline 105 are respectively connected to the intake pipeline 102 at the intake end and the exhaust end of the second compressor 1042, and the first intake bypass pipeline 105 is connected to the intake pipeline 102 of the engine 101. At the same time, two first intake bypass valves 106 can be provided, and the two first intake bypass valves 106 can be respectively provided on the two first intake bypass pipelines 105, so as to control the opening and closing of the corresponding first intake bypass pipelines 105 through the first intake bypass valves 106.

[0062] In addition, if Figure 2As shown, when the connection mode of the electric supercharger 103 and the turbocharger 104 is parallel connection, the first compressor 1032 and the second compressor 1042 are connected in parallel to the intake pipe 102, the number of the first intake bypass pipe 105 is one, and the first intake bypass pipe 105 is connected in parallel to the electric supercharger 103 and the turbocharger 104. That is, one end of the first intake bypass pipe 105 is connected to the intake pipe 102 at the intake end of the first compressor 1032 and the second compressor 1042, and the other end of the first intake bypass pipe 105 is connected to the intake pipe 102 at the exhaust end of the first compressor 1032 and the second compressor 1042, and the first intake bypass pipe 105 is connected to the intake pipe 102 of the engine 101. At the same time, a first intake bypass valve 106 may be provided, and the first intake bypass valve 106 is provided on the first intake bypass line 105 , so as to control the on-off of the first intake bypass line 105 through the first intake bypass valve 106 .

[0063] The second intake bypass line 107 can be connected in parallel with the boost device, that is, one end of the second intake bypass line 107 can be connected to the intake line 102 between the target exhaust end and the engine 101, and the other end of the second intake bypass line 107 can be connected to the intake line 102 on the side of the target intake end away from the engine 101, wherein the target exhaust end is the exhaust end of the first compressor 1032 and the exhaust end of the second compressor 1042, close to the exhaust end of the engine 101; the target intake end is the intake end of the first compressor 1032 and the intake end of the second compressor 1042, away from the intake end of the engine 101.

[0064] A cooling device 111 may also be provided on the intake pipe 102 between the supercharging device and the engine 101, and the supercharged gas discharged from the supercharging device may be cooled by the cooling device 111 before entering the engine 101. Among them, one end of the second intake bypass pipe 107 connected between the target exhaust end and the engine 101 may be connected to the intake pipe 102 between the cooling device 111 and the engine 101, so that the gas discharged into the second intake bypass pipe 107 is the gas cooled by the cooling device 111, thereby effectively reducing the heat resistance requirements for the second intake bypass pipe 107, and quickly reducing the flow rate of the supercharged gas entering the engine 101, further improving the response speed of the supercharging device.

[0065] The controller can obtain the current working condition of the vehicle in real time, and based on the current working condition of the vehicle, control the opening and closing of the electric supercharger 103 and control the opening and closing of the first intake bypass line 105 and the second intake bypass line 107. For example, the opening and closing of the first intake bypass line 105 is controlled by controlling the opening and closing of the first intake bypass valve 106, and the opening and closing of the second intake bypass line 107 is controlled by controlling the opening and closing of the second intake bypass valve 108.

[0066] The working condition of the vehicle may include a rapid acceleration condition, a starting condition, a load increase condition, a deceleration condition, a load reduction condition, a high speed condition, a high load condition, etc. For example, the controller may control the opening and closing of the electric supercharger 103 and the on-off of the first intake bypass line 105 and the second intake bypass line 107 based on the current working condition of the vehicle and the target corresponding relationship, and the target corresponding relationship may be used to characterize the corresponding relationship between the working condition and the opening and closing state of the electric supercharger 103 and the on-off state of the first intake bypass line 105 and the second intake bypass line 107. In addition, the controller may also determine the target intake volume of the engine 101 based on the current working condition of the vehicle, and control the opening and closing of the electric supercharger 103 and the on-off of the first intake bypass line 105 and the second intake bypass line 107 based on the size relationship between the target intake volume and the current intake volume of the engine 101, so as to adjust the size of the intake volume of the engine 101. Therefore, the intake volume of the engine 101 can be adjusted in real time according to the changes in the working conditions of the vehicle by controlling the opening and closing of the electric supercharger 103 and the on-off of the first intake bypass line 105 and the second intake bypass line 107, thereby effectively improving the response speed of the supercharging device and avoiding the energy consumption caused by the electric supercharger 103 being in a working state in unnecessary situations (such as, the turbocharger 104 can meet the intake volume demand of the engine 101), thereby effectively reducing the energy consumption of the supercharging device; at the same time, by controlling the on-off of the first intake bypass line 105 and the second intake bypass line 107, the intake volume of the engine 101 can be quickly adjusted, further improving the response speed of the supercharging device.

[0067] In one possible implementation, reference Figure 1 and Figure 2 , a first intake bypass valve 106 is provided on the first intake bypass line 105, and the first intake bypass valve 106 is used to control the on-off of the first intake bypass line 105; and a second intake bypass valve 108 is provided on the second intake bypass line 107, and the second intake bypass valve 108 is used to control the on-off of the second intake bypass line 107;

[0068] The controller is specifically used for:

[0069] Based on the current operating conditions, determine the relationship between the target air intake volume of the engine 101 and the current air intake volume of the engine 101;

[0070] The opening and closing of the electric supercharger 103 is controlled based on the size relationship, and the opening and closing of the first intake bypass valve 106 and the second intake bypass valve 108 are controlled based on the size relationship and the connection mode between the electric supercharger 103 and the turbocharger 104 .

[0071] Specifically, the controller can obtain the vehicle's operating condition in real time based on the vehicle's throttle opening and load signal, and determine the target intake volume of the engine 101 based on the vehicle's current operating condition. For example, the controller can calculate the target intake volume of the engine 101 based on the current operating condition and the operating data of the engine 101. The operating data of the engine 101 may include the temperature, pressure, speed, displacement, compression ratio, fuel injection amount, etc. of the engine 101. For example, the target intake volume of the engine 101 can be calculated based on the current operating condition and the operating data of the engine 101 through a theoretical cycle model of the engine 101.

[0072] The current air intake volume of the engine 101 is the actual air intake volume of the engine 101 at the current moment. The controller can also obtain the actual air intake volume of the engine 101 in real time, and compare the current air intake volume of the engine 101 with the target air intake volume of the engine 101, so as to control the opening and closing of the electric supercharger 103 based on the size relationship between the target air intake volume of the engine 101 and the current air intake volume of the engine 101. At the same time, based on the size relationship between the target air intake volume of the engine 101 and the current air intake volume of the engine 101 and the connection mode between the electric supercharger 103 and the turbocharger 104, the opening and closing of the first intake bypass valve 106 and the second intake bypass valve 108 can be controlled to control the opening and closing of the first intake bypass line 105 and the second intake bypass line 107.

[0073] During implementation, the difference between the target intake volume of the engine 101 and the current intake volume of the engine 101 can be obtained, and when the absolute value of the difference is greater than a preset threshold, the opening and closing of the electric supercharger 103, the first intake bypass valve 106 and the second intake bypass valve 108 are controlled, and when the absolute value of the difference is less than or equal to the preset threshold, the opening and closing states of the electric supercharger 103, the first intake bypass valve 106 and the second intake bypass valve 108 are controlled to remain unchanged, thereby effectively avoiding frequent opening and closing of the electric supercharger 103, the first intake bypass valve 106 and the second intake bypass valve 108 caused by errors such as data collection, thereby ensuring the reliable operation of the supercharging device.

[0074] Among them, in the process of controlling the opening and closing of the electric supercharger 103 based on the size relationship between the target air intake of the engine 101 and the current air intake of the engine 101, the electric supercharger 103 can be controlled to start when the target air intake is greater than the current air intake, and the electric supercharger 103 can be controlled to close when the target air intake is less than the current air intake, and the electric supercharger 103 can be controlled to keep the current opening and closing state unchanged when the target air intake is equal to the current air intake. Therefore, when the target air intake is greater than the current air intake, the electric supercharger 103 can be started in time to meet the air intake demand of the engine 101, and when the target air intake is less than the current air intake, the electric supercharger 103 can be closed in time to reduce the energy consumption of the electric supercharger 103, so that the energy consumption of the supercharging device can be reduced while effectively improving the response speed of the supercharging device.

[0075] It can be understood that when the electric supercharger 103 is in the starting state, the speed of the electric motor 1031 can also be adjusted based on the absolute value of the difference between the target intake volume and the current intake volume to adjust the flow rate of the boosted gas discharged by the electric supercharger 103, and when the target intake volume is less than or equal to the maximum output flow rate of the turbocharger 104, the electric supercharger 103 is controlled to be closed, thereby effectively reducing the energy consumption of the electric supercharger 103 while meeting the intake volume demand of the engine 101.

[0076] In addition, in the process of controlling the opening and closing of the first intake bypass valve 106 and the second intake bypass valve 108 based on the relationship between the target intake volume of the engine 101 and the current intake volume of the engine 101 and the connection mode of the electric supercharger 103 and the turbocharger 104, different methods can be used to control the opening and closing of the first intake bypass valve 106 and the second intake bypass valve 108 when the connection mode of the electric supercharger 103 and the turbocharger 104 is a serial connection and a parallel connection, so as to effectively adjust the intake volume of the engine 101 while ensuring the safe operation of the first compressor 1032 and the second compressor 1042, thereby further improving the response speed of the boosting device.

[0077] In a feasible implementation manner, when the connection mode between the electric supercharger 103 and the turbocharger 104 is a serial connection, the controller is specifically configured to:

[0078] If the target intake air volume is greater than the current intake air volume, the second intake bypass valve 108 and the first intake bypass valve 106 far from the engine 101 are controlled to be closed;

[0079] If the target intake air amount is less than the current intake air amount, the first intake bypass valve 106 far from the engine 101 is controlled to open, and the second intake bypass valve 108 and / or the first intake bypass valve 106 close to the engine 101 is controlled to open.

[0080] Specifically, when the connection mode of the electric supercharger 103 and the turbocharger 104 is a serial connection, it includes two first intake bypass lines 105 respectively connected in parallel with the electric supercharger 103 and the turbocharger 104 , and two first intake bypass valves 106 respectively arranged on the two first intake bypass lines 105 .

[0081] During implementation, when the target intake volume of the engine 101 is greater than the current intake volume of the engine 101, the second intake bypass valve 108 can be controlled to be closed, and the first intake bypass valve 106 away from the engine 101 can be controlled to be closed, so as to prevent the pressurized gas exhausted by the first compressor 1032 and the second compressor 1042 from flowing back through the intake bypass line to the intake line 102 at the end of the supercharging device away from the engine 101, thereby affecting the intake volume of the engine 101, thereby ensuring the power of the engine 101.

[0082] In addition, when the target intake amount of the engine 101 is greater than the current intake amount of the engine 101, the first intake bypass valve 106 near the engine 101 can also be controlled to be opened or closed. When the first intake bypass valve 106 near the engine 101 is closed, the first compressor 1032 and the second compressor 1042 provide pressurized gas to the engine 101 in a series manner, that is, the pressurized gas discharged from the compressor far away from the engine 101 is discharged to the engine 101 through the compressor near the engine 101. When the first intake bypass valve 106 near the engine 101 is opened, the first compressor 1032 and the second compressor 1042 can form a parallel manner to provide pressurized gas to the engine 101, that is, the pressurized gas discharged from the compressor far away from the engine 101 can directly enter the engine 101 through the first intake bypass line 105 connected in parallel with the compressor near the engine 101.

[0083] As a preferred embodiment, when the target air intake volume of the engine 101 is greater than the current air intake volume of the engine 101, the first air intake bypass valve 106 close to the engine 101 is controlled to open, so that the pressurized gas discharged from the first compressor 1032 and the pressurized gas discharged from the second compressor 1042 can enter the engine 101 at the same time, and then when the air intake volume demand of the engine 101 increases, the flow rate of the pressurized gas entering the engine 101 can be quickly increased, further improving the response speed of the supercharging device.

[0084] When the target intake amount of the engine 101 is less than the current intake amount of the engine 101, the first intake bypass valve 106 far from the engine 101 can be controlled to open, so that the excess pressurized gas discharged from the compressor connected in parallel with it (i.e., the compressor far from the engine 101) can be discharged to the intake pipeline 102 at the intake end of the compressor through the first intake bypass pipeline 105 where the first intake bypass valve 106 is located; at the same time, the second intake bypass valve 108 and / or the first intake bypass valve 105 near the engine 101 can be controlled to open. The bypass valve 106 is opened to discharge the excess pressurized gas discharged from the compressor close to the engine 101 to the intake pipe 102 at the intake end of the compressor far from the engine 101 through the second intake bypass line 107 where the second intake bypass valve 108 is located, and / or, to discharge the excess pressurized gas discharged from the compressor connected in parallel (i.e., the compressor close to the engine 101) to the intake pipe 102 at the intake end of the compressor through the first intake bypass line 105 where the first intake bypass valve 106 is located. It can be understood that when one of the second intake bypass valve 108 and the first intake bypass valve 106 close to the engine 101 is controlled to be opened, the other intake bypass valve can be controlled to be closed.

[0085] Therefore, when the target intake volume of the engine 101 is less than the current intake volume of the engine 101, by controlling the first intake bypass valve 106 far away from the engine 101 to open, and controlling the second intake bypass valve 108 and / or the first intake bypass valve 106 close to the engine 101 to open, the intake volume of the engine 101 can be more effectively controlled, and the first compressor 1032 and the second compressor 1042 can be avoided from surging and being damaged when the required intake volume of the engine 101 is reduced. This can quickly respond to changes in the intake volume demand of the engine 101 while ensuring the working safety of the compressor, thereby further improving the response speed of the supercharging device.

[0086] As a preferred embodiment, when the target intake volume of the engine 101 is greater than the current intake volume of the engine 101, the second intake bypass valve 108 is controlled to be opened, and the first intake bypass valve 106 close to the engine 101 is controlled to be closed. On the one hand, the excess pressurized gas discharged from the compressor close to the engine 101 can be discharged through the second intake bypass line 107 where the second intake bypass valve 108 is located, so as to effectively control the intake volume of the engine 101 and avoid surge of the compressor close to the engine 101. On the other hand, it can effectively avoid air flow turbulence when the two first intake bypass valves 106 are opened at the same time, causing the excess pressurized gas discharged from the first compressor 1032 and the second compressor 1042 to be unable to be effectively discharged, thereby effectively avoiding damage to the first compressor 1032 and the second compressor 1042 due to surge.

[0087] In a feasible implementation manner, when the connection mode of the electric supercharger 103 and the turbocharger 104 is parallel connection, the controller is specifically used to:

[0088] If the target intake air volume is greater than the current intake air volume, the second intake bypass valve 108 and the first intake bypass valve 106 are controlled to be closed;

[0089] If the target intake air amount is less than the current intake air amount, the second intake bypass valve 108 and / or the first intake bypass valve 106 are controlled to open.

[0090] Specifically, when the connection mode of the electric supercharger 103 and the turbocharger 104 is parallel connection, it includes a first intake bypass line 105 connected in parallel with the first compressor 1032 and the second compressor 1042 , and a first intake bypass valve 106 arranged on the first intake bypass line 105 .

[0091] During implementation, when the target intake volume of the engine 101 is greater than the current intake volume of the engine 101, the second intake bypass valve 108 and the first intake bypass valve 106 can be controlled to be closed to prevent the pressurized gas exhausted by the first compressor 1032 and the second compressor 1042 from flowing back through the intake bypass line to the intake line 102 at the end of the supercharging device away from the engine 101, thereby affecting the intake volume of the engine 101, thereby ensuring the power of the engine 101.

[0092] In addition, when the target intake volume of the engine 101 is less than or equal to the current intake volume of the engine 101, the second intake bypass valve 108 and / or the first intake bypass valve 106 can be controlled to open, so that the excess pressurized gas discharged by the first compressor 1032 and the second compressor 1042 can be discharged to the intake pipe 102 at the end of the supercharging device away from the engine 101 through the second intake bypass valve 108 and / or the first intake bypass valve 106, so as to effectively control the intake volume of the engine 101 and avoid surging of the first compressor 1032 and the second compressor 1042, thereby being able to quickly respond to changes in the intake volume demand of the engine 101 while ensuring the working safety of the compressor, thereby further improving the response speed of the supercharging device.

[0093] In a feasible embodiment, the dual-boost system also includes an exhaust bypass valve 302 arranged on an exhaust bypass line 301, and the exhaust bypass line 301 is connected in parallel with the turbine 1041 in the turbocharger 104. The controller is also used to control the opening and closing of the exhaust bypass valve 302 based on the current operating conditions of the vehicle.

[0094] Specifically, taking the serial connection of the electric supercharger 103 and the turbocharger 104 as an example, the connection method of the waste gas bypass valve 302 can be as follows: Figure 3As shown. The turbine 1041 can be connected to the exhaust pipe 110 of the engine 101, and the two ends of the exhaust bypass pipe 301 are respectively connected to the exhaust pipe 110 at the intake end and the exhaust end of the turbine 1041, that is, the exhaust bypass pipe 301 is connected to the exhaust pipe 110 of the engine 101. The exhaust bypass valve 302 can be arranged on the exhaust bypass pipe 301 to adjust the amount of exhaust gas entering the turbine 1041 by controlling the opening and closing of the exhaust bypass valve 302, thereby realizing the adjustment of the rotation speed of the turbine 1041, so as to effectively control the flow rate of the pressurized gas discharged from the turbocharger 104 to the engine 101.

[0095] The controller may control the opening and closing of the wastegate valve 302 in real time based on the current working condition of the vehicle. For example, the size relationship between the target intake volume of the engine 101 and the current intake volume of the engine 101 may be determined based on the current working condition of the vehicle, and when the absolute value of the difference between the target intake volume of the engine 101 and the current intake volume of the engine 101 is greater than a preset threshold, the opening and closing of the wastegate valve 302 may be controlled based on the size relationship. For example, when the target intake volume of the engine 101 is greater than the current intake volume of the engine 101, the wastegate valve 302 may be controlled to be closed so that the exhaust gas discharged from the engine 101 is used for the operation of the turbocharger 104, thereby maximizing the rotation speed of the turbine 1041, and further effectively increasing the flow rate of the supercharged gas discharged from the turbocharger 104 to the engine 101, so as to meet the intake volume requirement of the engine 101. When the target air intake of the engine 101 is less than the current air intake of the engine 101, the electric supercharger 103 may be controlled to be turned off first, and after the electric supercharger 103 is turned off, the opening and closing of the waste gas bypass valve 302 may be further controlled according to the relationship between the target air intake of the engine 101 and the current air intake of the engine 101. For example, if the target air intake of the engine 101 is still less than the current air intake after the electric supercharger 103 is turned off, the waste gas bypass valve 302 may be controlled to be opened to reduce the exhaust gas flow entering the turbine 1041, thereby reducing the rotation speed of the turbine 1041, and thus effectively reducing the flow of the supercharged gas discharged from the turbocharger 104 to the engine 101 to meet the air intake demand of the engine 101.

[0096] It is understandable that after the exhaust bypass valve 302 is controlled to open, the target opening of the exhaust bypass valve 302 can be determined according to the target intake volume of the engine 101, and the exhaust bypass valve 302 can be controlled to adjust to the target opening to effectively meet the intake volume requirement of the engine 101.

[0097] In a feasible embodiment, the dual-boost system also includes an exhaust gas recirculation control valve 402 arranged on an exhaust gas recirculation (EGR) pipeline 401, and the two ends of the exhaust gas recirculation pipeline 401 are respectively connected to the intake pipeline 102 and the exhaust pipeline 110 of the engine 101, and the controller is also used to control the opening and closing of the exhaust gas recirculation control valve 402 based on the current operating conditions of the vehicle.

[0098] Specifically, taking the serial connection of the electric supercharger 103 and the turbocharger 104 as an example, the connection diagram of the exhaust gas recirculation control valve 402 can be as follows: Figure 4 or Figure 5 The two ends of the exhaust gas recirculation pipeline 401 can be connected to the intake pipeline 102 and the exhaust pipeline 110 of the engine 101 respectively, and the exhaust gas recirculation control valve 402 is connected to the exhaust gas recirculation pipeline 401 to control the on-off of the exhaust gas recirculation pipeline 401 .

[0099] For example, Figure 4 As shown, the two ends of the exhaust gas recirculation pipeline 401 can be respectively connected to the intake pipeline 102 of the engine 101 and the end of the exhaust pipeline 110 far away from the engine 101, that is, the low-pressure exhaust gas discharged by the turbine 1041 enters the intake pipeline 102 of the engine 101 through the exhaust gas recirculation pipeline 401 and mixes with the fresh air. The mixed gas enters the engine 101 after being pressurized by the compressor.

[0100] In addition, if Figure 5 As shown, both ends of the exhaust gas recirculation line 401 can also be connected to the intake line 102 of the engine 101 and one end of the exhaust line 110 close to the engine 101, that is, the high-pressure exhaust gas discharged from the engine 101 passes through the exhaust gas recirculation line 401 and enters the intake line 102 of the engine 101 before entering the turbine 1041, and enters the engine 101 after being mixed with the pressurized gas discharged from the compressor.

[0101] During implementation, the opening and closing of the exhaust gas recirculation control valve 402 can be controlled based on the current operating conditions of the vehicle. For example, under conditions with large exhaust volume such as high-speed conditions and high-load conditions, the exhaust gas recirculation control valve 402 can be controlled to open so that the exhaust gas discharged by the engine 101 re-enters the engine 101, thereby effectively reducing the emission of nitrogen oxides.

[0102] Exemplary Methods

[0103] In an exemplary embodiment of the present specification, a dual boost control method is also provided, which is applied to a dual boost system as in any of the above embodiments. Figure 6 As shown, the method includes the following steps executed by the controller:

[0104] S601 , based on the current working condition of the vehicle, control the opening and closing of the electric supercharger 103 and control the opening and closing of the first intake bypass line 105 and the second intake bypass line 107 .

[0105] In a feasible implementation manner, controlling the on / off of the electric supercharger 103 and controlling the on / off of the first intake bypass line 105 and the second intake bypass line 107 based on the current working condition of the vehicle includes:

[0106] Based on the current operating conditions, determine the relationship between the target air intake volume of the engine 101 and the current air intake volume of the engine 101;

[0107] The opening and closing of the electric supercharger 103 is controlled based on the size relationship, and the opening and closing of the first intake bypass valve 106 and the second intake bypass valve 108 are controlled based on the size relationship and the connection mode between the electric supercharger 103 and the turbocharger 104 .

[0108] In a feasible implementation, based on the size relationship and the connection mode between the electric supercharger 103 and the turbocharger 104, the opening and closing of the first intake bypass valve 106 and the second intake bypass valve 108 are controlled, including:

[0109] When the connection mode of the electric supercharger 103 and the turbocharger 104 is a serial connection, if the target intake air volume is greater than the current intake air volume, the second intake bypass valve 108 and the first intake bypass valve 106 far from the engine 101 are controlled to be closed;

[0110] If the target intake air amount is less than the current intake air amount, the first intake bypass valve 106 far from the engine 101 is controlled to open, and the second intake bypass valve 108 and / or the first intake bypass valve 106 close to the engine 101 is controlled to open.

[0111] In a feasible implementation manner, when the connection mode of the electric supercharger 103 and the turbocharger 104 is a serial connection, it also includes:

[0112] If the target intake air volume is greater than the current intake air volume, the first intake bypass valve 106 close to the engine 101 is controlled to open;

[0113] and / or,

[0114] If the target intake air amount is smaller than the current intake air amount, the second intake bypass valve 108 is controlled to be opened, and the first intake bypass valve 106 close to the engine 101 is controlled to be closed.

[0115] In a feasible implementation, based on the size relationship and the connection mode between the electric supercharger 103 and the turbocharger 104, the opening and closing of the first intake bypass valve 106 and the second intake bypass valve 108 are controlled, including:

[0116] When the connection mode of the electric supercharger 103 and the turbocharger 104 is parallel connection, if the target intake air volume is greater than the current intake air volume, the second intake bypass valve 108 and the first intake bypass valve 106 are controlled to be closed;

[0117] If the target intake air amount is less than the current intake air amount, the second intake bypass valve 108 and / or the first intake bypass valve 106 are controlled to open.

[0118] Example Vehicles

[0119] In an exemplary embodiment of the present specification, a vehicle is further provided, comprising an engine 101 and a dual supercharging system as described in any of the above embodiments.

[0120] Exemplary computer program products and storage media

[0121] In addition to the above-mentioned methods and devices, the dual-boost control method provided in the embodiments of this specification may also be a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to execute the steps of the dual-boost control method according to various embodiments of this specification described in the above-mentioned "Exemplary Method" section of this specification.

[0122] The computer program product may be written in any combination of one or more programming languages ​​to write program code for performing the operations of the embodiments of the present specification, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the semiconductor process equipment, partially on the equipment, as a separate software package, partially on the semiconductor process equipment and partially on a remote semiconductor process equipment, or entirely on a remote semiconductor process equipment or server.

[0123] In addition, an embodiment of the present specification also provides a computer-readable storage medium on which a computer program is stored, and the computer program is executed by a processor to execute the steps of the dual-boost control method according to various embodiments of the present specification described in the above "Exemplary Method" section of the present specification.

[0124] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this specification can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0125] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0126] The above-mentioned embodiments only express several implementation methods of this specification, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the solutions provided by the embodiments of this specification. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of this specification, which all belong to the protection scope of this specification. Therefore, the protection scope of the patent of this specification shall be based on the attached claims.

Claims

1. A dual boost system, characterized in that: include: A supercharging device, a first intake bypass pipeline, a second intake bypass pipeline and a controller; The supercharging device includes an electric supercharger and a turbocharger connected to the air intake line of the engine; The first air intake bypass pipeline is connected in parallel with the electric supercharger and / or the turbocharger, and the second air intake bypass pipeline is connected in parallel with the supercharging device; The controller is used to control the opening and closing of the electric supercharger and the opening and closing of the first intake bypass line and the second intake bypass line based on the current working condition of the vehicle.

2. The system according to claim 1, characterized in that A first intake bypass valve is provided on the first intake bypass pipeline, and the first intake bypass valve is used to control the on-off of the first intake bypass pipeline; and a second intake bypass valve is provided on the second intake bypass pipeline, and the second intake bypass valve is used to control the on-off of the second intake bypass pipeline; The controller is specifically used for: Based on the current operating condition, determining a magnitude relationship between a target air intake volume of the engine and a current air intake volume of the engine; The opening and closing of the electric supercharger is controlled based on the size relationship, and the opening and closing of the first intake bypass valve and the second intake bypass valve are controlled based on the size relationship and a connection mode between the electric supercharger and the turbocharger.

3. The system according to claim 2, characterized in that When the connection mode of the electric supercharger and the turbocharger is a serial connection, the number of the first intake bypass line and the number of the first intake bypass valve are both two, the two first intake bypass valves are respectively arranged on the two first intake bypass lines, and the two first intake bypass lines are respectively connected to the electric supercharger and the turbocharger in parallel.

4. The system according to claim 3, characterized in that When the connection mode between the electric supercharger and the turbocharger is a serial connection, the controller is specifically used for: If the target intake air amount is greater than the current intake air amount, controlling the second intake bypass valve and the first intake bypass valve away from the engine to close; If the target intake air amount is less than the current intake air amount, the first intake bypass valve far from the engine is controlled to open, and the second intake bypass valve and / or the first intake bypass valve close to the engine are controlled to open.

5. The system according to claim 4, characterized in that When the connection mode between the electric supercharger and the turbocharger is a serial connection, the controller is specifically used for: If the target intake air volume is greater than the current intake air volume, a first intake bypass valve close to the engine is also controlled to open; and / or, If the target intake air amount is less than the current intake air amount, the second intake bypass valve is controlled to be opened, and the first intake bypass valve close to the engine is controlled to be closed.

6. The system according to claim 2, characterized in that When the connection mode of the electric supercharger and the turbocharger is parallel connection, the number of the first intake bypass line and the number of the first intake bypass valve are both one, and the first intake bypass line is connected in parallel with the electric supercharger and the turbocharger.

7. The system according to claim 6, characterized in that When the connection mode of the electric supercharger and the turbocharger is parallel connection, the controller is specifically used for: If the target intake air amount is greater than the current intake air amount, controlling the second intake bypass valve and the first intake bypass valve to be closed; If the target intake air amount is less than the current intake air amount, the second intake bypass valve and / or the first intake bypass valve are controlled to open.

8. A dual boost control method, characterized in that: Applied to the dual boost system according to any one of claims 1 to 7, the method comprises the following steps performed by the controller: The electric supercharger is controlled to be turned on and off based on the current working condition of the vehicle, and the first intake bypass line and the second intake bypass line are controlled to be turned on and off.

9. The method according to claim 8, characterized in that Controlling the on / off of the electric supercharger and controlling the on / off of the first intake bypass line and the second intake bypass line based on the current working condition of the vehicle includes: Based on the current operating condition, determining a magnitude relationship between a target air intake volume of the engine and a current air intake volume of the engine; The opening and closing of the electric supercharger is controlled based on the size relationship, and the opening and closing of the first intake bypass valve and the second intake bypass valve are controlled based on the size relationship and a connection mode between the electric supercharger and the turbocharger.

10. A vehicle, characterized in that: include: An engine and a dual-supercharging system according to any one of claims 1 to 7.

Images