CN117167169A - Engine air intake and exhaust control system and control method of hybrid electric vehicle - Google Patents

Abstract

The invention provides an engine air intake and exhaust control system and a control method of a hybrid electric vehicle, wherein the control system comprises an air intake pipeline, an engine, an air outlet pipeline, a supercharger, an intercooler, a throttle valve and an exhaust gas recirculation pipeline which are sequentially arranged, and the control system further comprises: an air inlet valve arranged on the air inlet pipeline is positioned between an air inlet of the air inlet pipeline and an air outlet of the exhaust gas recirculation pipeline; the electronic compressor is arranged on the first bypass pipeline, and the air inlet valve is adjusted to control whether the inlet air passes through the first bypass pipeline or not; and a bypass valve disposed in the second bypass line for controlling whether air passes through the second bypass line. The invention can realize heating of the air inlet and outlet pipelines of the engine system, so that condensed water entering the engine is discharged, and waste gas in the waste gas pipelines, in particular the volute of the supercharger is discharged; and prevent the engine air inlet and outlet pipeline from icing when the ambient temperature is low.

Description

Engine air intake and exhaust control system and control method of hybrid electric vehicle

Technical Field

The invention belongs to the technical field of engine control, and particularly relates to an engine air intake and exhaust control system and method of a hybrid electric vehicle.

Background

At present, LP-EGR (Low-Pressure Exhaust Gas Re-circulation) technology and WCAC (Water Charge Air Cooler, water-cooled intercooler) technology are used as effective fuel-saving and emission-reducing technologies, and are increasingly commonly applied to special engines (DHE) of hybrid systems. The LP-EGR technique is a technique in which exhaust gas discharged from an engine is reintroduced into an intake line in front of a supercharger, and enters a cylinder to participate in combustion again. The WCAC technology functions to cool the pressurized gas by cooling water. The DHE engine can be operated under the condition that the LP-EGR and the WCAC work simultaneously under most working conditions, so that the engine can be ensured to operate in an optimal thermal efficiency area, and the energy conservation and the emission reduction are facilitated.

However, when the engine is operated for a long time in the optimum thermal efficiency region, LP-EGR high temperature and high humidity exhaust gas is mixed with low temperature air before the supercharger is pressurized, and condensate water is inevitably generated; when the mixed gas passes through the water-cooling intercooler and the throttle valve, condensed water is easy to be generated due to the fact that the surface temperature of the cooling fin of the water-cooling intercooler is too low. And when the hybrid power vehicle runs, the special engine and the battery of the hybrid power system can be frequently switched, and when the environment temperature is extremely low (such as winter) and the engine stops running immediately, the condensed water of the air inlet pipeline is extremely easy to freeze, and even if part of condensed water enters the engine cylinder, part of condensed water is easy to accumulate on the surface of parts. At the same time, the exhaust gas in the exhaust gas pipeline, particularly in the turbocharger volute, is not discharged in time, and a backheating phenomenon can occur, so that the bearing system of the turbocharger is overheated, and the service life of the turbocharger can be reduced.

Disclosure of Invention

The invention aims to solve the problems that when the ambient temperature of the existing hybrid electric vehicle is low and the engine stops running, condensed water in an air inlet pipeline of the engine is easy to freeze and a bearing system of a supercharger is easy to overheat.

In order to solve the problems, the invention provides an engine air inlet and outlet control system of a hybrid electric vehicle, which comprises an air inlet pipeline, an engine, an air outlet pipeline, a supercharger, an intercooler and a throttle valve which are sequentially arranged; the supercharger comprises a turbine and a compressor which are in transmission connection, the turbine is arranged on an air outlet pipeline, the compressor, the intercooler and the throttle valve are sequentially arranged on the air inlet pipeline, and the throttle valve is close to the engine; the engine air inlet and outlet control system further comprises an exhaust gas recirculation pipeline, an air inlet of the exhaust gas recirculation pipeline is connected to an air outlet pipeline at a position positioned at the downstream of the turbine, and an air outlet of the exhaust gas recirculation pipeline is connected to an air inlet pipeline at a position positioned at the upstream of the compressor.

The engine intake and exhaust control system further includes: the air inlet valve is arranged on the air inlet pipeline and is positioned between the air inlet of the air inlet pipeline and the air outlet of the exhaust gas recirculation pipeline; the exhaust gas recirculation device comprises a first bypass pipeline and an electronic compressor arranged on the first bypass pipeline, wherein an air inlet of the first bypass pipeline is connected to a position, located at the upstream of an air inlet valve, of an air inlet pipeline, and an air outlet of the first bypass pipeline is connected to a position, located between the air inlet valve and an air outlet of an exhaust gas recirculation pipeline, of the air inlet pipeline; and whether the air entering from the air inlet of the air inlet pipeline passes through the first bypass pipeline can be controlled by adjusting the air inlet valve; one end of the second bypass pipeline is connected to the air inlet pipeline at a position between the air outlet of the first bypass pipeline and the air outlet of the exhaust gas recirculation pipeline, and the other end of the second bypass pipeline is connected to the air inlet pipeline at a position between the air compressor and the intercooler; and a bypass valve disposed in the second bypass line for controlling whether air passes through the second bypass line.

By adopting the scheme, a first bypass pipeline, a second bypass pipeline, an electronic air compressor, an air inlet valve and a bypass valve are added in an engine air inlet and exhaust control system; when the engine stops running, air entering from the air inlet of the air inlet pipeline passes through the first bypass pipeline by controlling the air inlet valve, the bypass valve and the electronic air compressor, the electronic air compressor compresses the air passing through the first bypass pipeline, so that the air pressure and the temperature rise, and after passing through the second bypass pipeline, the high-temperature high-pressure air passes through the intercooler, the throttle valve, the engine and the supercharger in sequence, so that the air inlet pipeline and the air outlet pipeline of the engine system are heated, condensed water entering the engine is discharged, and waste gas in the waste gas pipeline, particularly waste gas in the volute of the supercharger is discharged; and prevent the engine air inlet and outlet pipeline from icing when the ambient temperature is low.

According to another embodiment of the present invention, the engine intake and exhaust control system disclosed in the embodiment of the present invention further includes: the controller is respectively in communication connection with the electronic compressor, the air inlet valve, the bypass valve and the throttle valve, and is used for controlling the running states of the electronic compressor, the air inlet valve, the bypass valve and the throttle valve according to the running condition of the engine; if the engine stops running, the controller respectively controls the air inlet valve to be closed, the bypass valve to be opened and the throttle valve to be fully opened, and simultaneously controls the electronic compressor to run, so that air entering from the air inlet of the air inlet pipeline flows to the intercooler through the second bypass pipeline after being pressurized by the electronic compressor through the first bypass pipeline.

By adopting the scheme, the controller is added, the judgment control process is realized through the controller, the control is convenient, and the accuracy is high.

According to another specific embodiment of the invention, the engine air intake and exhaust control system disclosed by the embodiment of the invention further comprises a temperature sensor, wherein the temperature sensor is arranged on the air inlet pipeline and is positioned between the throttle valve and the engine; the controller is in communication connection with the temperature sensor, acquires the temperature of gas in the gas inlet pipeline acquired by the temperature sensor, and controls the running states of the electronic compressor, the gas inlet valve, the bypass valve and the throttle valve according to the temperature; if the temperature is greater than a preset temperature threshold, the controller respectively controls the air inlet valve to open, the bypass valve to close and the throttle valve to close, and simultaneously controls the electronic air compressor to stop running, so that air entering from the air inlet of the air inlet pipeline flows to the intercooler through the air compressor of the supercharger after passing through the air inlet valve.

By adopting the scheme, the temperature of the gas in the gas inlet pipeline is used as the condition for judging whether to stop the operation of the electronic aerostatic press, so that the gas for heating the gas inlet and outlet pipeline of the engine system reaches a certain temperature, the effect of discharging condensed water is ensured, and the effect of preventing icing is further achieved.

According to another specific embodiment of the invention, the engine air intake and exhaust control system disclosed by the embodiment of the invention further comprises a motor, and the controller further controls the running states of the electronic air compressor, the air intake valve, the bypass valve and the throttle valve according to the running condition of the motor; if the engine stops running and the motor runs, the controller respectively controls the air inlet valve to be closed, the bypass valve to be opened and the throttle valve to be fully opened, and simultaneously controls the electronic air compressor to run.

According to another embodiment of the present invention, the engine intake and exhaust control system disclosed in the embodiment of the present invention further includes: an exhaust gas recirculation cooler disposed on the exhaust gas recirculation line; the mixing valve is arranged at the air outlet position of the exhaust gas recirculation pipeline; the controller also controls the mixing valve to close if the engine stops.

The invention also provides an engine air intake and exhaust control method of the hybrid electric vehicle, which is executed by the engine air intake and exhaust control system of the hybrid electric vehicle; the engine intake and exhaust control method comprises the following steps:

s1: acquiring a working condition signal of an automobile, and judging whether the running condition of the electronic air compressor is met or not according to the working condition signal; the working condition signals comprise engine running state signals, and the electronic compressor running conditions comprise engine stop operation; if yes, enter step S2;

s2: the method comprises the steps of respectively controlling an air inlet valve to be closed, a bypass valve to be opened and a throttle valve to be fully opened, and simultaneously controlling an electronic compressor to operate, so that air entering from an air inlet of an air inlet pipeline is pressurized by the electronic compressor through a first bypass pipeline and then flows to an engine through an intercooler and the throttle valve sequentially through a second bypass pipeline;

s3: judging whether the stop operation condition of the electronic compressor is met; if yes, enter step S4; if not, continuing to judge whether the stop operation condition of the electronic compressor is met;

s4: and respectively controlling the opening of the air inlet valve, the closing of the bypass valve and the closing of the throttle valve, and simultaneously controlling the electronic air compressor to stop running.

After the engine stops running, condensed water is easy to generate in the engine system, and if the ambient temperature is low, the engine system can be frozen; by adopting the scheme, when the engine stops running, the electronic compressor compresses air entering the air inlet through controlling the air inlet valve, the bypass valve and the electronic compressor, so that the air pressure and the temperature rise, and the high-temperature and high-pressure air sequentially passes through the intercooler, the throttle valve, the engine and the supercharger, so that the air inlet and outlet pipelines of the engine system are heated, condensed water entering the engine is discharged, and the waste gas pipeline, particularly the waste gas in the turbine volute of the supercharger, is discharged; and prevent the engine air inlet and outlet pipeline from icing when the ambient temperature is low.

According to another embodiment of the present invention, the method for controlling air intake and exhaust of an engine disclosed in the embodiment of the present invention, wherein the step S3 of determining whether the operation stopping condition of the electronic compressor is satisfied includes: the controller acquires the temperature of the gas in the gas inlet pipeline acquired by the temperature sensor, and compares the relation between the temperature and a preset temperature threshold; and if the temperature is greater than the preset temperature threshold, judging that the operation stopping condition of the electronic compressor is met.

According to another embodiment of the present invention, in the engine intake and exhaust control method disclosed in the embodiment of the present invention, in step S1, the operating condition signal further includes a motor operating state signal, and the electronic compressor operating condition further includes motor operation.

According to another embodiment of the present invention, in the method for controlling intake and exhaust of an engine disclosed in the embodiment of the present invention, in step S2, the mixing valve is also controlled to be closed.

According to another specific embodiment of the invention, the engine air intake and exhaust control method disclosed by the embodiment of the invention, wherein the working condition signals also comprise environmental temperature signals; in the step S2, the controller also controls the operation of the electronic air compressor according to the ambient temperature signal; the lower the ambient temperature is, the higher the rotating speed of the electronic compressor is controlled by the controller.

The beneficial effects of the invention are as follows:

according to the engine air intake and exhaust control system of the hybrid electric vehicle, a first bypass pipeline, a second bypass pipeline, an electronic air compressor, an air inlet valve and a bypass valve are added in the engine system; when the engine stops running, the air inlet valve, the bypass valve and the electronic air compressor are controlled to enable air entering from the air inlet to pass through the first bypass pipeline, the electronic air compressor compresses the air passing through the first bypass pipeline to enable the air pressure and the air temperature to rise, and high-temperature high-pressure air passes through the second bypass pipeline and then sequentially passes through the intercooler, the throttle valve, the engine and the supercharger to heat the air inlet and outlet pipeline of the engine system, so that condensed water entering the engine is discharged, and waste gas in the waste gas pipeline, particularly waste gas in the turbine volute of the supercharger is discharged; and prevent the engine air inlet and outlet pipeline from icing when the ambient temperature is low.

Drawings

FIG. 1 is a schematic diagram of an engine intake and exhaust control system of a hybrid electric vehicle according to the present invention;

fig. 2 is a flowchart of an engine intake and exhaust control method of a hybrid electric vehicle according to the present invention.

Reference numerals illustrate:

10: an air intake line; 101: an air inlet; 102: an intake valve; 103: a first bypass line; 104: an electronic compressor; 105: a second bypass line; 106: a bypass valve; 107: an intercooler; 108: a throttle valve; 109: a temperature sensor;

20: an engine;

30: an air outlet pipeline;

40: a supercharger; 401: a turbine; 402: a compressor;

50: an exhaust gas recirculation line; 501: an exhaust gas recirculation cooler; 502: a mixing valve;

60: and a controller.

Detailed Description

Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present specification, by describing the embodiments of the present invention with specific examples. While the description of the invention will be described in connection with the preferred embodiments, it is not intended to limit the inventive features to the implementation. Rather, the purpose of the invention described in connection with the embodiments is to cover other alternatives or modifications, which may be extended by the claims based on the invention. The following description contains many specific details for the purpose of providing a thorough understanding of the present invention. The invention may be practiced without these specific details. Furthermore, some specific details are omitted from the description in order to avoid obscuring the invention. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.

It should be noted that in this specification, like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present embodiment, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship in which the inventive product is conventionally put in use, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present invention.

The terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.

In the description of the present embodiment, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present embodiment can be understood in a specific case by those of ordinary skill in the art.

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Example 1

An engine intake and exhaust control system of a hybrid electric vehicle is provided, as shown in fig. 1, and includes an intake pipe 10, an engine 20, an exhaust pipe 30, a supercharger 40, an intercooler 107, and a throttle valve 108, which are sequentially arranged. The intake line 10 has an intake 101 at its end remote from the engine 20 for fresh air to enter in the direction of the arrow in the figure. The supercharger 40 comprises a turbine 401 and a compressor 402 in driving connection, the turbine 401 being arranged on the outlet line 30, the compressor 402, the intercooler 107 and the throttle valve 108 being arranged in sequence on the inlet line 10, and the throttle valve 108 being close to the engine 20.

The engine intake and exhaust control system further includes an exhaust gas recirculation line 50, wherein an air inlet of the exhaust gas recirculation line 50 is connected to the air outlet line 30 at a position downstream of the turbine 401, and an air outlet of the exhaust gas recirculation line 50 is connected to the air inlet line 10 at a position upstream of the compressor 402. In one embodiment, the exhaust gas recirculation line 50 is further provided with a low pressure exhaust gas recirculation cooler 501 (LP-EGR cooler), and the exhaust gas recirculation line 50 is provided with a mixing valve 502 at the outlet position.

The engine intake and exhaust control system in the present invention further includes an intake valve 102, a first bypass line 103, an electronic compressor 104, a second bypass line 105, and a bypass valve 106.

Wherein the inlet valve 102 is arranged on the inlet line 10 and is located between the inlet 101 of the inlet line 10 and the outlet of the exhaust gas recirculation line 50. The air inlet of the first bypass pipeline 103 is connected to the air inlet pipeline 10 at a position located upstream of the air inlet valve 102, and the air outlet of the first bypass pipeline 103 is connected to the air inlet pipeline 10 at a position located between the air inlet valve 102 and the air outlet of the exhaust gas recirculation pipeline 50; and, whether or not the air taken in from the air intake port 101 of the intake pipe 10 passes through the first bypass pipe 103 can be controlled by adjusting the intake valve 102; the electronic compressor 104 is arranged on the first bypass line 103.

If the intake valve 102 is opened, the air entering from the intake port 101 of the intake pipe 10 does not pass through the first bypass pipe 103; if the intake valve 102 is closed, air taken in from the intake port 101 of the intake pipe 10 passes through the first bypass pipe 103, and at this time, the electronic compressor 104 may be turned on to operate, thereby pressurizing the air passing through the first bypass pipe 103. Wherein the electronic compressor 104 can control the rotational speed by controlling the amount of current applied, wherein the greater the current, the faster the rotational speed.

One end of the second bypass line 105 is connected to the air intake line 10 at a position between the air outlet of the first bypass line 103 and the air outlet of the exhaust gas recirculation line 50, and the other end of the second bypass line 105 is connected to the air intake line 10 at a position between the compressor 402 and the intercooler 107; a bypass valve 106 is provided in the second bypass line 105 for controlling whether air passes through the second bypass line 105. Wherein air passes through the second bypass line 105 if the bypass valve 106 is opened.

The intake valve 102, the electronic compressor 104, and the bypass valve 106 are connected to respective control modules, so as to control the intake valve 102, the electronic compressor 104, and the bypass valve 106. And intake valve 102 may be embodied as a butterfly valve and intercooler 107 may be embodied as a water-cooled intercooler.

The invention also provides an engine air intake and exhaust control method executed by the engine air intake and exhaust control system of the hybrid electric vehicle, as shown in fig. 2, the engine air intake and exhaust control method comprises the following steps:

s1: the working condition signal of the automobile is obtained, and whether the operation condition of the electronic compressor 104 is met is judged according to the working condition signal. Wherein the operating condition signal comprises an engine 20 operating condition signal and the electronic compressor 104 operating condition comprises an engine 20 shutdown. If yes, enter step S2; if not, continuing to judge.

After the engine 20 is stopped, the operation of both the supercharger 40 and the intercooler 107 is stopped; condensed water is easily generated in an engine system, and if the ambient temperature is low, the engine system can be frozen; in the embodiment in which the low-pressure egr cooler 501 and the mixing valve 502 are provided in the egr line 50 at the same time, the low-pressure egr cooler 501 is also stopped because no exhaust gas is produced.

S2: the intake valve 102 is controlled to be closed, the bypass valve 106 is controlled to be opened, the throttle valve 108 is controlled to be fully opened, and the electronic compressor 104 is controlled to operate, so that air entering from the air inlet 101 of the air inlet pipeline 10 is pressurized by the electronic compressor 104 through the first bypass pipeline 103 and then flows to the engine 20 and the turbine 401 of the supercharger 40 through the intercooler 107 and the throttle valve 108 sequentially through the second bypass pipeline 105. It should be noted that, part of the air pressurized by the electronic compressor 104 also flows through the compressor 402 of the booster 40.

It should be noted that the rotation speed of the electronic compressor 104 may be specifically controlled according to environmental conditions, vehicle conditions, engine and intercooler characteristics, and the like. In one embodiment of the present invention, the operating mode signal further includes an ambient temperature signal; in step S2, the electronic compressor 104 is also controlled to operate according to the ambient temperature signal; wherein the lower the ambient temperature, the greater the rotational speed of the control electronics compressor 104. In addition, the rotation speed of the electronic compressor 104 can be controlled according to the environmental altitude, the rotation speed of the electronic compressor 104 can be controlled according to the intercooler type, and the like. In embodiments where the mixing valve 502 is provided at the outlet position of the exhaust gas recirculation line 50, the mixing valve 502 is also controlled to close.

S3: judging whether the operation stopping condition of the electronic compressor 104 is met; if yes, enter step S4; if not, continuing to judge whether the operation stopping condition of the electronic compressor 104 is met.

It should be noted that the shutdown conditions of the electronic compressor 104 may include: the electronic compressor 104 is operated for a certain period of time, or the gas temperature in the system reaches a certain value, or the engine 20 needs to be started, etc.

S4: the electronic compressor 104 is controlled to stop running while the air inlet valve 102 is controlled to open, the bypass valve 106 is controlled to close, and the throttle valve 108 is controlled to close. In embodiments in which the mixing valve 502 is disposed at the outlet position of the exhaust gas recirculation line 50, the mixing valve 502 may be controlled to maintain a closed state; ready for the engine 20 to run again.

It should be noted that the driver may manually perform the judging step and operate the corresponding controller to control the corresponding device to be turned off or turned on; the controller such as a whole vehicle controller or an engine control unit can also judge and control the corresponding device to be closed or opened.

It should be noted that, when engine 20 is started to operate, booster 40 and intercooler 107 are both operated; controlling the opening of the intake valve 102, the closing of the bypass valve 106, the opening of the throttle valve 108, and the deactivation of the electronic compressor 104, air enters the supercharger 40 through the intake valve 102. In the embodiment in which the low-pressure EGR cooler 501 and the mixing valve 502 are provided on the EGR line 50, the operation of the low-pressure EGR cooler 501 is controlled according to whether the EGR condition is required for the operation of the engine 20; if the engine 20 is in operation under the condition that EGR is required, the low-pressure EGR cooler 501 is operated, the mixing valve 502 is opened for a certain angle, and at the moment, the exhaust gas passing through the low-pressure EGR cooler 501 and the fresh air are converged at the mixing valve 502 and then are sucked into the supercharger 40; if the engine 20 is operating without EGR conditions, the low pressure EGR cooler 501 stops and the mixing valve 502 is closed.

By adopting the scheme of the embodiment, a first bypass pipeline, a second bypass pipeline, an electronic air compressor, an air inlet valve and a bypass valve are added in an engine system; when the engine stops running, the air entering from the air inlet can pass through the first bypass pipeline by controlling the air inlet valve, the bypass valve and the electronic air compressor, the electronic air compressor compresses the air passing through the first bypass pipeline, so that the air pressure and the temperature rise, and the high-temperature and high-pressure air passes through the second bypass pipeline and then sequentially passes through the intercooler, the throttle valve, the engine and the supercharger, so that the air inlet and outlet pipelines of the engine system are heated, condensed water entering the engine is discharged, and the waste gas pipeline, particularly waste gas in the turbine volute of the supercharger, is discharged; and prevent the engine air inlet and outlet pipeline from icing when the ambient temperature is low.

Example 2

An engine intake and exhaust control system is provided, as shown in fig. 1, and the engine intake and exhaust control system further includes a controller 60 based on the engine intake and exhaust control system provided in embodiment 1. The controller 60 is communicatively coupled to the electronic compressor 104, the intake valve 102, the bypass valve 106, and the throttle valve 108, respectively (only the controller 60 is shown coupled to the electronic compressor 104 in FIG. 1); the controller 60 has corresponding control logic stored therein, and the controller 60 controls the operating states of the electronic compressor 104, the intake valve 102, the bypass valve 106, and the throttle valve 108 according to the operating conditions of the engine 20 according to the control logic.

If the controller 60 determines that the engine 20 is stopped, the controller 60 controls the intake valve 102 to be closed, the bypass valve 106 to be opened, and the throttle valve 108 to be fully opened, and controls the electronic compressor 104 to operate, so that air entering from the intake port 101 of the intake pipe 10 is pressurized by the electronic compressor 104 through the first bypass pipe 103 and flows to the intercooler 107 through the second bypass pipe 105.

Specifically, the engine air intake and exhaust control method executed by the engine air intake and exhaust control system of the hybrid electric vehicle comprises the following steps:

s1: the controller 60 acquires the working condition signal of the automobile and judges whether the operation condition of the electronic compressor 104 is met according to the working condition signal; if yes, go to step S2.

S2: the controller 60 controls the intake valve 102 to be closed, the bypass valve 106 to be opened, and the throttle valve 108 to be fully opened, and controls the electronic compressor 104 to operate at the same time, so that air entering from the intake port 101 of the intake pipeline 10 is pressurized by the electronic compressor 104 through the first bypass pipeline 103 and then flows to the engine 20 through the intercooler 107 and the throttle valve 108 sequentially through the second bypass pipeline 105.

S3: the controller 60 determines whether the operation stop condition of the electronic compressor 104 is satisfied; if yes, go to step S4.

S4: the controller 60 controls the opening of the intake valve 102, the closing of the bypass valve 106, and the closing of the throttle valve 108, respectively, while controlling the electronic compressor 104 to stop operating.

More specifically, the controller 60 may be an Engine Control Unit (ECU).

By adopting the scheme of the embodiment, the judgment control process is realized through the controller, the control is convenient, and the accuracy is high.

Example 3

As shown in fig. 1, the engine intake and exhaust control system according to embodiment 1 or embodiment 2 further includes a temperature sensor 109, where the temperature sensor 109 is disposed on the intake pipe 10 and between the throttle valve 108 and the engine 20. The temperature sensor 109 collects the temperature of the gas on the intake pipe 10, and the present embodiment also controls the operation states of the electronic compressor 104, the intake valve 102, the bypass valve 106, and the throttle valve 108 according to the temperature.

Based on the intake and exhaust control system of the engine 20 provided in embodiment 2, the controller 60 is communicatively connected to the temperature sensor 109 (not shown in the drawing), and obtains the temperature of the gas on the intake pipe 10 collected by the temperature sensor 109, and the controller 60 controls the operation states of the electronic compressor 104, the intake valve 102, the bypass valve 106, and the throttle valve 108 according to the temperature.

If the temperature is greater than the preset temperature threshold, the controller 60 controls the intake valve 102 to open, the bypass valve 106 to close, and the throttle valve 108 to close, and controls the electronic compressor 104 to stop running, so that air entering from the air inlet 101 of the intake pipeline 10 passes through the intake valve 102 and then flows to the intercooler 107 through the compressor 402 of the supercharger 40.

Further, the engine air intake and exhaust control method executed by the engine air intake and exhaust control system of the hybrid electric vehicle comprises the following steps: as shown in fig. 2, the determination as to whether the operation stop condition of the electronic compressor 104 is satisfied in the control method of step S3 of the above embodiment 1 or embodiment 2 includes: acquiring the temperature of the gas on the gas inlet pipeline 10 acquired by the temperature sensor 109, and comparing the relation between the temperature and a preset temperature threshold; if the temperature is greater than the preset temperature threshold, it is determined that the operation stop condition of the electronic compressor 104 is satisfied. If the controller 60 is provided, the temperature acquired by the temperature sensor 109 is acquired by the controller 60, and is compared, judged and controlled.

Specifically, different running conditions and different intercooler selections can enable the condensate water or icing degree of the engine system to be different, and the preset temperature threshold value is determined through calibration, so that the preset temperature threshold value corresponding to different systems under different conditions is obtained. When the running condition possibly causes serious icing of the engine system, the preset temperature threshold value is determined to be higher, so that the heating and icing prevention are faster. In addition, when the temperature of the EGR passing through the engine is high during the operation of the engine, and severe icing does not occur, the preset temperature threshold value is determined to be relatively low.

By adopting the scheme of the embodiment, the temperature of the gas in the gas inlet pipeline is used as the condition for judging whether to stop the operation of the electronic gas compressor, and the gas for heating the gas inlet and outlet pipeline of the engine system is ensured to reach a certain temperature, so that the effect of discharging condensed water is ensured, and the effect of preventing icing is further achieved.

Example 4

An engine intake and exhaust control system is provided, the invention is applied to a hybrid electric vehicle, and on the basis of the engine intake and exhaust control system provided in embodiments 1, 2 or 3, the system further comprises a motor (not shown in fig. 1), and the operation states of the electronic compressor 104, the intake valve 102, the bypass valve 106 and the throttle valve 108 are further controlled according to the operation condition of the motor; if the engine 20 is stopped and the motor is running, the electronic compressor 104 is controlled to run while the intake valve 102 is closed, the bypass valve 106 is opened, and the throttle valve 108 is fully opened, respectively.

On the basis of the engine intake and exhaust control system in which the controller 60 is provided in embodiment 2 or embodiment 3, the controller 60 obtains the operation condition of the motor and controls the operation states of the electronic compressor 104, the intake valve 102, the bypass valve 106, and the throttle valve 108.

Further, the engine air intake and exhaust control method executed by the engine air intake and exhaust control system of the hybrid electric vehicle comprises the following steps: in step S1 of the control method of embodiment 1, 2 or 3, wherein the operating condition signal further comprises a motor operation status signal, and the electronic compressor 104 operating condition further comprises motor operation; that is, if the engine 20 is stopped and the motor is running, it is determined that the operation condition of the electronic compressor 104 is satisfied.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a further detailed description of the invention with reference to specific embodiments, and it is not intended to limit the practice of the invention to those descriptions. Various changes in form and detail may be made therein by those skilled in the art, including a few simple inferences or alternatives, without departing from the spirit and scope of the present invention.

Claims (10)

1. An engine air inlet and outlet control system of a hybrid electric vehicle comprises an air inlet pipeline, an engine, an air outlet pipeline, a supercharger, an intercooler and a throttle valve which are sequentially arranged; the supercharger comprises a turbine and a gas compressor which are in transmission connection, the turbine is arranged on the gas outlet pipeline, the gas compressor, the intercooler and the throttle valve are sequentially arranged on the gas inlet pipeline, and the throttle valve is close to the engine; the engine air inlet and exhaust control system further comprises an exhaust gas recirculation pipeline, an air inlet of the exhaust gas recirculation pipeline is connected to the air outlet pipeline at a position positioned at the downstream of the turbine, and an air outlet of the exhaust gas recirculation pipeline is connected to the air inlet pipeline at a position positioned at the upstream of the compressor, and the engine air inlet and exhaust control system is characterized by further comprising:

the air inlet valve is arranged on the air inlet pipeline and is positioned between an air inlet of the air inlet pipeline and an air outlet of the exhaust gas recirculation pipeline;

the exhaust gas recirculation device comprises a first bypass pipeline and an electronic compressor arranged on the first bypass pipeline, wherein an air inlet of the first bypass pipeline is connected to the air inlet pipeline at a position located at the upstream of the air inlet valve, and an air outlet of the first bypass pipeline is connected to the air inlet pipeline at a position located between the air inlet valve and an air outlet of the exhaust gas recirculation pipeline; and, whether the air taken in from the air inlet of the air intake line passes through the first bypass line can be controlled by adjusting the air intake valve;

one end of the second bypass pipeline is connected to the air inlet pipeline at a position between the air outlet of the first bypass pipeline and the air outlet of the exhaust gas recirculation pipeline, and the other end of the second bypass pipeline is connected to the air inlet pipeline at a position between the air compressor and the intercooler;

and a bypass valve provided in the second bypass line for controlling whether the air passes through the second bypass line.

2. The engine intake and exhaust control system according to claim 1, characterized in that the engine intake and exhaust control system further comprises:

the controller is respectively in communication connection with the electronic compressor, the air inlet valve, the bypass valve and the throttle valve, and is used for controlling the running states of the electronic compressor, the air inlet valve, the bypass valve and the throttle valve according to the running condition of the engine; wherein,

and if the engine stops running, the controller respectively controls the air inlet valve to be closed, the bypass valve to be opened and the throttle valve to be fully opened, and simultaneously controls the electronic air compressor to run, so that air entering from the air inlet of the air inlet pipeline flows to the intercooler through the second bypass pipeline after being pressurized by the electronic air compressor through the first bypass pipeline.

3. The engine intake and exhaust control system according to claim 2, characterized in that the engine intake and exhaust control system further includes a temperature sensor that is provided on the intake pipe and that is located between the throttle valve and the engine;

the controller is in communication connection with the temperature sensor, acquires the temperature of the gas in the gas inlet pipeline acquired by the temperature sensor, and controls the running states of the electronic compressor, the air inlet valve, the bypass valve and the throttle valve according to the temperature; wherein,

and if the temperature is greater than a preset temperature threshold, the controller respectively controls the air inlet valve to open, the bypass valve to close and the throttle valve to close, and simultaneously controls the electronic air compressor to stop running, so that air entering from the air inlet of the air inlet pipeline passes through the air inlet valve and then flows to the intercooler through the air compressor of the supercharger.

4. The engine intake and exhaust control system according to claim 2, further comprising a motor, wherein the controller further controls the operating states of the electronic compressor, the intake valve, the bypass valve, and the throttle valve according to the operating conditions of the motor; wherein,

and if the engine stops running and the motor runs, the controller respectively controls the air inlet valve to be closed, the bypass valve to be opened and the throttle valve to be fully opened, and simultaneously controls the electronic air compressor to run.

5. The engine intake and exhaust control system according to any one of claims 2 to 4, characterized in that the engine intake and exhaust control system further comprises:

an exhaust gas recirculation cooler provided on the exhaust gas recirculation line;

the mixing valve is arranged at the air outlet position of the exhaust gas recirculation pipeline;

the controller also controls the mixing valve to close if the engine stops running.

6. An engine intake and exhaust control method of a hybrid electric vehicle, characterized by being executed by the engine intake and exhaust control system of a hybrid electric vehicle according to any one of claims 1 to 5; the engine intake and exhaust control method comprises the following steps:

s1: acquiring a working condition signal of an automobile, and judging whether the running condition of the electronic air compressor is met or not according to the working condition signal; wherein the working condition signals comprise engine running state signals, and the electronic compressor running conditions comprise engine stop operation;

if yes, enter step S2;

s2: the method comprises the steps of respectively controlling an air inlet valve to be closed, a bypass valve to be opened and a throttle valve to be fully opened, and simultaneously controlling an electronic compressor to operate, so that air entering from an air inlet of an air inlet pipeline is pressurized by the electronic compressor through a first bypass pipeline and then flows to an engine through an intercooler and the throttle valve sequentially through a second bypass pipeline;

s3: judging whether the electronic compressor stopping operation condition is met;

if yes, enter step S4;

if not, continuing to judge whether the electronic compressor stopping operation condition is met;

s4: and respectively controlling the air inlet valve to open, the bypass valve to close and the throttle valve to close, and simultaneously controlling the electronic air compressor to stop running.

7. The engine intake and exhaust control method according to claim 6, wherein the step S3 of determining whether the electronic compressor stopping condition is satisfied comprises:

the controller acquires the temperature of the gas in the gas inlet pipeline acquired by the temperature sensor and compares the relation between the temperature and a preset temperature threshold;

and if the temperature is greater than a preset temperature threshold, judging that the operation stopping condition of the electronic compressor is met.

8. The engine intake and exhaust control method according to claim 6, wherein in the step S1, the operating condition signal further includes a motor operating state signal, and the electronic compressor operating condition further includes the motor operation.

9. The engine intake and exhaust control method according to claim 6, wherein in step S2, a mixing valve provided at an air outlet position of the exhaust gas recirculation line is also controlled to be closed.

10. The engine intake and exhaust control method according to any one of claims 6 to 9, characterized in that the operating condition signal further includes an ambient temperature signal; in the step S2, the controller further controls the electronic compressor to operate according to the ambient temperature signal; wherein,

the lower the ambient temperature, the greater the rotational speed of the electronic compressor is controlled by the controller.