CN108798930B - Engine control system and automobile - Google Patents

Engine control system and automobile Download PDF

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Publication number
CN108798930B
CN108798930B CN201710313462.2A CN201710313462A CN108798930B CN 108798930 B CN108798930 B CN 108798930B CN 201710313462 A CN201710313462 A CN 201710313462A CN 108798930 B CN108798930 B CN 108798930B
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China
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exhaust gas
gas recirculation
secondary air
engine
line
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CN108798930A (en
Inventor
张冬生
谷家鑫
于洪涛
曹海波
张艳海
贺燕铭
田安民
陈桂祥
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BAIC Motor Powertrain Co Ltd
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BAIC Motor Powertrain Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M23/00—Apparatus for adding secondary air to fuel-air mixture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M23/00—Apparatus for adding secondary air to fuel-air mixture
    • F02M23/04—Apparatus for adding secondary air to fuel-air mixture with automatic control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1002—Output torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/101—Engine speed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Supercharger (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention provides an engine control system and an automobile, wherein the engine control system comprises: a supercharged engine; an exhaust gas recirculation system coupled to the supercharged engine; a secondary air injection system connected to the supercharged engine; an electronic control unit electrically connected to an exhaust gas recirculation valve in the exhaust gas recirculation system and a secondary air injection valve in the secondary air injection system, respectively; the electronic control unit controls the open/close states of the exhaust gas recirculation valve and the secondary air injection valve according to the rotation speed and the load of the supercharged engine. According to the invention, the exhaust gas recirculation system and the secondary air injection system which are connected with the supercharged engine are arranged on the supercharged engine, and the electronic control unit controls the opening and closing states of the exhaust gas recirculation valve and the secondary air injection valve according to the rotating speed and the load of the supercharged engine, so that the advantages of an EGR (exhaust gas recirculation) technology are fully exerted, the fuel consumption rate is reduced, and the fuel economy performance, the power performance and the emission performance of the supercharged engine are taken into consideration in a full load range.

Description

Engine control system and automobile
Technical Field
The invention relates to the technical field of engines, in particular to an engine control system and an automobile.
Background
In recent years, with the increasing severity of air pollution, the fuel economy and emission performance of automobiles are more and more severely limited. The new energy automobile is limited by production cost, driving range, driving safety and other aspects, is difficult to popularize and use in a short time, is the most practical and effective for technical upgrading of the existing traditional fuel, particularly an EGR (Exhaust Gas Recirculation) technology, can effectively improve the fuel consumption level and emission performance of a gasoline engine, and is increasingly concerned.
The principle of EGR technology for improving engine performance is that the characteristic of higher specific heat of recirculated exhaust gas is utilized to reduce the combustion temperature of mixed gas in a cylinder, so that NO under medium and high load working conditions is improvedxEmission levels, mitigating the enrichment strategy that is often employed due to excessive exhaust temperatures. However, the existing EGR technology has poor fuel economy and emission performance of the engine under the starting condition, the idling condition and the external characteristic condition; and the condition of energy waste also exists under the medium and high load working condition.
Disclosure of Invention
The invention aims to provide an engine control system and an automobile, so that the problems that the fuel economy and the emission performance of the engine are poor under the starting working condition, the idling working condition and the external characteristic working condition in the existing EGR technology can be solved; and the energy waste problem exists under the medium and high load working condition.
In order to achieve the above object, an embodiment of the present invention provides an engine control system including:
a supercharged engine;
an exhaust gas recirculation system coupled to the supercharged engine;
a secondary air injection system connected to the supercharged engine;
an electronic control unit electrically connected to an exhaust gas recirculation valve in the exhaust gas recirculation system and a secondary air injection valve in the secondary air injection system, respectively;
wherein the electronic control unit controls the open/close states of the exhaust gas recirculation valve and the secondary air injection valve in accordance with the rotation speed and the load of the supercharged engine.
Wherein the supercharged engine includes:
an engine body;
the first air inlet pipeline is connected with the engine body, and a throttle valve is arranged in the first air inlet pipeline;
the intercooler is connected with the first air inlet pipeline;
the second air inlet pipeline is connected with the intercooler;
a third air intake line in communication with the second air intake line;
a first exhaust line connected to the engine body;
a second exhaust line in communication with the first exhaust line;
a three-way catalyst connected to the second exhaust line;
a third exhaust line connected to the three-way catalyst;
and a supercharger disposed between the second intake line and the first exhaust line.
Wherein the exhaust gas recirculation system comprises:
a first exhaust gas recirculation line in communication with the second exhaust line;
an exhaust gas recirculation cooler connected to the first exhaust gas recirculation line;
a second egr line connected to the egr cooler;
a mixing chamber connected to the second exhaust gas recirculation line.
Wherein the EGR valve is disposed in the second EGR line.
Wherein the mixing chamber is mounted to the third air intake line.
Wherein the secondary air injection system comprises:
the secondary air injection pipe is connected with an exhaust manifold of the supercharged engine, and the secondary air injection valve is arranged in the secondary air injection pipe;
a secondary air pump connected to the secondary air injection pipe;
the connecting pipeline is connected with the secondary air pump and communicated with the third air inlet pipeline;
the electronic control unit is specifically used for controlling the exhaust gas recirculation valve to be closed and the secondary air injection valve to be opened when the rotating speed and the load of the supercharged engine meet first preset conditions;
when the rotating speed and the load of the supercharged engine meet second preset conditions, controlling the exhaust gas recirculation valve to be opened and the secondary air injection valve to be closed;
and when the rotating speed and the load of the supercharged engine meet a third preset condition, controlling the exhaust gas recirculation valve to be opened, and opening the secondary air injection valve.
Wherein the secondary air injection pipe has branch pipe portions as many as the exhaust manifolds and a main injection pipe portion communicating with the branch pipe portions;
wherein the branch pipe portion is connected to the exhaust manifold;
the main injection pipe part is connected with the secondary air pump;
the secondary air injection valve is arranged in the main injection pipe part.
Wherein the load of the supercharged engine is an output torque of the supercharged engine.
Wherein, still include:
an air cleaner disposed at an air inlet end of the third air intake line; and
and the air inlet mixing valve is positioned between the air filter and the mixing cavity and is arranged in the third air inlet pipeline.
The present invention also provides an automobile comprising: an engine control system as described above.
The technical scheme of the invention has the following beneficial effects:
in the scheme of the embodiment of the invention, the exhaust gas recirculation system and the secondary air injection system which are respectively connected with the supercharged engine are arranged on the supercharged engine, the exhaust gas recirculation valve and the secondary air injection valve are electrically connected with the electronic control unit, and the electronic control unit controls the opening and closing states of the exhaust gas recirculation valve and the secondary air injection valve according to the rotating speed and the load of the supercharged engine, so that the advantages of an EGR (exhaust gas recirculation) technology are fully exerted, the fuel consumption rate is reduced, the emission performance of the starting and idling working conditions and the external characteristic working conditions of the supercharged gasoline engine is improved, and the fuel economy performance, the power performance and the emission performance of the supercharged engine are considered in a full-load range.
Drawings
FIG. 1 is one of the operational flow diagrams of an engine control system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of operating conditions of the engine control system corresponding to different rotating speeds and loads according to the embodiment of the invention.
FIG. 3 is a second flowchart illustrating operation of an engine control system according to an embodiment of the present invention;
fig. 4 is a third flowchart of the engine control system according to the embodiment of the present invention.
Description of reference numerals:
1-a supercharged engine; 2-an exhaust gas recirculation valve; 3-a secondary air injection valve; 4-an engine body; 5-a first inlet line; 6-a throttle valve; 7-an intercooler; 8-a second inlet line; 9-a third air intake line; 10-a first exhaust line; 11-a second exhaust line; 12-a three-way catalyst; 13-a third exhaust line; 14-a supercharger; 15-a first exhaust gas recirculation line; 16-an exhaust gas recirculation cooler; 17-a second exhaust gas recirculation line; 18-a mixing chamber; 19-secondary air injection pipe; 20-secondary air pump; 21-connecting a pipeline; 22-a branch pipe portion; 23-main jet pipe section; 24-an air filter; 25-an intake mixing valve; 26-a gas compressor; 27-turbine.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, an embodiment of the present invention provides an engine control system including: a supercharged engine 1; an exhaust gas recirculation system connected to the supercharged engine 1; a secondary air injection system connected to the supercharged engine 1; an electronic control unit (not shown in the figure) electrically connected to the egr valve 2 in the egr system and the secondary air injection valve 3 in the secondary air injection system, respectively; the electronic control unit controls the open/close states of the exhaust gas recirculation valve 2 and the secondary air injection valve 3 in accordance with the rotation speed and load of the supercharged engine 1.
It is noted that an exhaust gas recirculation system, i.e., an EGR system, is used to return a portion of the exhaust gas from the engine to the intake manifold and re-enter the cylinders with fresh mixture. Because the waste gas contains a large amount of CO2Equal polyatomic gas, and CO2When the gas can not be combusted, the gas absorbs a large amount of heat due to high specific heat capacity, so that the maximum combustion temperature of the gas mixture in the cylinder is reduced, and NO is reducedxThe amount of production of (c).
Here, an exhaust gas recirculation valve 2 in the exhaust gas recirculation system is used to guide exhaust gas discharged by engine combustion to the intake manifold to participate in combustion.
Here, the secondary air injection system is used to send fresh air into the engine exhaust manifold, thereby further oxidizing and combusting the hydrocarbon and carbon monoxide in the exhaust gas, reducing the emission of hydrocarbon and carbon monoxide in the exhaust gas.
An Electronic Control Unit (ECU), also called a "traveling computer" or a "vehicle-mounted computer", etc.
Specifically, the electronic control unit may acquire the rotation speed of the supercharged engine 1 through an engine rotation speed sensor; the load condition of the supercharged engine 1 is obtained by a throttle position sensor and an air flow meter. The electronic control unit controls the opening and closing states of the exhaust gas recirculation valve 2 and the secondary air injection valve 3 according to the rotating speed and the load of the supercharged engine, so that the advantages of an EGR (exhaust gas recirculation) technology are fully exerted, and the fuel economy performance, the power performance and the emission performance of the supercharged engine are considered in a full load range.
As shown in fig. 1, a supercharged engine 1 in the embodiment of the invention includes: an engine body 4; a first air inlet pipeline 5 connected with the engine body 4, wherein a throttle valve 6 is arranged in the first air inlet pipeline 5; an intercooler 7 connected to the first intake pipe 5; a second air inlet line 8 connected to the intercooler 7; a third intake line 9 communicating with the second intake line 8; a first exhaust line 10 connected to the engine body 4; a second exhaust line 11 communicating with the first exhaust line 10; a three-way catalyst 12 connected to the second exhaust line 11; a third exhaust line 13 connected to the three-way catalyst 12; and a supercharger 14 disposed between the second intake line 8 and the first exhaust line 10.
Here, one end of the first intake pipe 5 is connected to the engine body 4, and the other end is connected to the intercooler 7; one end of the second air inlet pipeline 8 is connected with the intercooler 7, and the other end of the second air inlet pipeline is connected with the third air inlet pipeline 9; the first inlet line 5 communicates with the second inlet line 8, i.e. the second inlet line 8 communicates with the second inlet line 8 via an intercooler 7.
One end of the first exhaust pipeline 10 is connected with the engine body 4, the other end of the first exhaust pipeline is connected with the second exhaust pipeline 11, and the first exhaust pipeline 10 is communicated with the second exhaust pipeline 11; one end of a second exhaust pipeline 11 is connected with the first exhaust pipeline 10, and the other end of the second exhaust pipeline is connected with a three-way catalyst 12; one end of the third exhaust pipeline 13 is connected with the three-way catalyst 12, the other end of the third exhaust pipeline is communicated with the external environment, and the third exhaust pipeline 13 is communicated with the second exhaust pipeline 11, namely, the third exhaust pipeline 13 is communicated with the second exhaust pipeline 11 through the three-way catalyst 12.
It is preferable that, as shown in fig. 1, the supercharger 14 is a turbocharger, wherein the turbocharger includes: a compressor 26 and a turbine 27. Here, a compressor 26 is located in the second intake line 8 and a turbine 27 is located in the first exhaust line 10.
Specifically, as shown in fig. 1, the exhaust gas recirculation system includes: a first exhaust gas recirculation line 15 communicating with the second exhaust line 11; an exhaust gas recirculation cooler 16 connected to the first exhaust gas recirculation line 15; a second exhaust gas recirculation line 17 connected to the exhaust gas recirculation cooler 16; a mixing chamber 18 connected to the second exhaust gas recirculation line 17.
Here, an exhaust gas recirculation valve 2 is arranged in the second exhaust gas recirculation line 17; a mixing chamber 18 is mounted in the third inlet line 9.
Specifically, one end of the first exhaust gas recirculation line 15 is communicated with the second exhaust line 11, and the other end is communicated with the exhaust gas recirculation cooler 16; the second egr line 17 is connected at one end to the egr cooler 16 and at the other end to the mixing chamber 18.
It should be noted that one end of the first exhaust gas recirculation line 15 communicates with the second exhaust gas line 11, i.e., the three-way catalyst 12 is preceded by two branches, the second exhaust gas line 11 and the first exhaust gas recirculation line 15. That is, the exhaust gas circulation system of the embodiment of the invention adopts an upstream gas taking mode, combustible and combustible substances such as unburned hydrocarbon, carbon monoxide and the like contained in exhaust gas are fully utilized to improve the combustion process of mixed gas, and the fuel economy of the engine is improved.
As shown in fig. 1, the secondary air injection system in the embodiment of the present invention includes: a secondary air injection pipe 19 connected to an exhaust manifold (not shown) of the supercharged engine 1, the secondary air injection valve 3 being provided in the secondary air injection pipe 19; a secondary air pump 20 connected to the secondary air injection pipe 19; and a connection line 21 connected to the secondary air pump 20, the connection line 21 communicating with the third air intake line 9.
Specifically, the secondary air injection pipe 19 has branch pipe portions 22 as many as the number of exhaust manifolds and a main injection pipe portion 23 communicating with the branch pipe portions 22; the branch pipe portion 22 is connected to an exhaust manifold.
The electronic control unit is specifically used for controlling the exhaust gas recirculation valve 2 to be closed and the secondary air injection valve 3 to be opened when the rotating speed and the load of the supercharged engine 1 meet first preset conditions;
when the rotating speed and the load of the supercharged engine 1 meet second preset conditions, controlling the exhaust gas recirculation valve 2 to be opened and the secondary air injection valve 3 to be closed;
and when the rotating speed and the load of the supercharged engine 1 meet the third preset condition, controlling the exhaust gas recirculation valve 2 to be opened and the secondary air injection valve 3 to be opened.
It is preferable that the load on the supercharged engine 1 in the embodiment of the invention is the output torque T of the supercharged engine 1.
Here, as shown in fig. 2, a schematic diagram of the operating conditions corresponding to different rotation speeds and loads of the engine control system according to the embodiment of the present invention is shown. Wherein the abscissa represents the rotational speed n of the supercharged engine; the ordinate represents the output torque T of the supercharged engine.
The first predetermined condition is specifically that the supercharged engine 1 is in a start-up and idle condition, specifically as shown in the portion ① of fig. 2, i.e. 0<n<n1And 0 is<T<T1，n1Indicating a first predetermined speed, T1Representing a first preset torque;
the second predetermined condition may specifically be that the supercharged engine 1 is in a medium-to-high load non-enriched condition, specifically region ② of fig. 2, where the engine speed and/or engine output torque is/are greater than the engine speed and/or engine output torque in both the start-up and idle conditions.
The third predetermined condition is specifically that the supercharged engine 1 is in a heavy-load enrichment condition, specifically region ③ in fig. 2, where the output torque of the engine is mostly greater than the output torque of the engine in a medium-load to high-load non-enrichment condition.
Here, the region ①, the region ②, and the region ③ do not overlap with each other.
Specifically, the engine control system according to the embodiment of the present invention further includes: an air cleaner 24 provided at an intake end of the third intake pipe 9; and an intake mixing valve 25 located between the air cleaner 24 and the mixing chamber 18 and disposed in the third intake line 9.
The operation of the engine control system according to the embodiment of the present invention will be specifically described with reference to fig. 1 in conjunction with fig. 3 and 4.
As shown in fig. 1, when the rotation speed and the load of the supercharged engine 1 meet a first preset condition, that is, the supercharged engine 1 is in a starting and idling working condition, the electronic control unit controls the exhaust gas recirculation valve 2 to be closed and the secondary air injection valve 3 to be opened;
here, when the supercharged engine is in the starting and idling conditions, in order to ensure the reliable starting of the engine, an enrichment strategy is often adopted, because working media in a cylinder are relatively less and the supercharged engine has poor combustion stability, the fuel economy performance and the emission performance of the supercharged engine under the starting and idling conditions cannot be improved by using an EGR technology, so that the electronic control unit controls the exhaust gas recirculation valve 2 to be closed and controls the secondary air injection valve 3 to be opened when the supercharged engine 1 is in the starting and idling conditions.
The specific working process is as follows: fresh air enters the inlet of the secondary air pump 20 through the air filter 24 and reaches the inlet of the secondary air injection valve 3 after passing through the secondary air pump 20, and because the secondary air injection valve 3 is opened at the moment, the air enters the exhaust manifold of each cylinder through the secondary air injection pipe 19 and reacts with unburned hydrocarbons, so that the emission performance of the supercharged engine is improved.
It should be noted that when the supercharged engine 1 is in the starting and idling conditions, only the secondary air injection system is used to inject air into the exhaust manifold to perform the oxidation exothermic reaction with the excessive fuel oil, so as to reduce the emission of hydrocarbon and carbon monoxide, and simultaneously, the temperature of the three-way catalyst 12 is rapidly raised, thereby achieving good emission performance.
As shown in fig. 3, when the rotation speed and the load of the supercharged engine 1 meet a second preset condition, that is, when the supercharged engine 1 is in a medium-load to high-load non-enrichment working condition, the electronic control unit controls the exhaust gas recirculation valve 2 to be opened and the secondary air injection valve 3 to be closed;
the specific working process is as follows: after passing through the air filter 24 and the intake air mixing valve 25, the fresh air is mixed with the low-pressure egr gas passing through the egr cooler 16 and the egr valve 2 in the mixing chamber 18, and after passing through the intercooler 7 and the throttle valve 6, the fresh air finally enters the cylinders of the supercharged engine.
Here, the exhaust gas recirculation system adopts an upstream gas taking mode of the three-way catalyst 12, and can fully utilize a small amount of combustible and combustible substances such as unburned hydrocarbon, carbon monoxide and the like in the catalytic front exhaust, so that the combustion process of mixed gas is improved, the energy waste is avoided, and the fuel economy of the engine is improved.
As shown in fig. 4, when the rotation speed and the load of the supercharged engine 1 meet a third preset condition, that is, the supercharged engine 1 is in a heavy-load enrichment condition, the electronic control unit controls the exhaust gas recirculation valve 2 to be opened and the secondary air injection valve 3 to be opened;
here, in order to improve the power performance of the supercharged engine and reduce the exhaust temperature at the same time, an enrichment strategy is generally used particularly under the heavy-load working condition; although the EGR technology can reduce the in-cylinder combustion temperature, the EGR dosage is not too high limited by the maximum boost pressure and combustion stability, so that in the heavy load enrichment condition, only opening the EGR valve 2 will degrade the fuel economy and emission performance of the supercharged engine 1, so that the secondary air injection valve 3 needs to be opened.
The specific process flow comprises the following steps: exhaust gas discharged from an exhaust manifold of the supercharged engine 1 directly enters the exhaust gas recirculation cooler 16 after passing through the turbine 27, is mixed with fresh air in the mixing chamber 18 after passing through the exhaust gas recirculation valve 2, and enters a cylinder after passing through the compressor 26, the intercooler 7 and the throttle valve 6; in addition, since the secondary air injection valve 3 is opened, air passes through the air cleaner 24, the secondary air pump 20, and the secondary air injection valve 3, and is injected into each cylinder exhaust manifold through the secondary air injection pipe 19.
Here, the heavy load enrichment regime is used with EGR technology, i.e. exhaust gas recirculation and secondary air injection. Namely, the combustion temperature in the cylinder can be obviously reduced by using a low-pressure EGR technology, so that the enrichment requirement is reduced, and the fuel economy performance is improved; meanwhile, because the exhaust temperature is reduced, a heating space is provided for adopting a secondary air injection technology, therefore, the low-pressure EGR technology is adopted to match with a secondary air injection system under the working condition, and the fuel economy performance and the power performance of the engine under the large-load working condition can be improved simultaneously.
It should be noted that the electronic control unit can realize the switching of the three operating modes of the supercharged engine 1, and the switching is controlled by the cooperative operation of the exhaust gas recirculation valve 2 and the secondary air injection valve 3, and the transition region (such as the transition zone between the region ①, the region ② and the region ③ in fig. 2, the thick line part in the figure) is arranged in the middle to prevent the electric valve from frequently operating.
According to the engine control system provided by the embodiment of the invention, the electronic control unit determines the matching modes of the exhaust gas recirculation valve of the exhaust gas recirculation system and the secondary air injection valve of the secondary air recirculation system, namely starting and idling conditions according to the change of the rotating speed and the load of the engine, and the secondary air injection system is used for improving the emission performance; under the working condition of medium load to high load without enrichment, the fuel economy performance of the engine is improved by adopting a low-pressure EGR mode of taking gas from the upstream of the catalyst; under a heavy-load enrichment working condition, the exhaust gas recirculation system is matched with the secondary air injection system to improve the emission performance of the engine, and the fuel economy performance, the power performance and the emission performance of the supercharged engine are considered within a full-load range.
An embodiment of the present invention further provides an automobile, including: an engine control system as described above.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (8)

1. An engine control system, comprising:
a supercharged engine (1);
-an exhaust gas recirculation system connected to the supercharged engine (1);
a secondary air injection system connected to the supercharged engine (1);
an electronic control unit electrically connected to an exhaust gas recirculation valve (2) in the exhaust gas recirculation system and a secondary air injection valve (3) in the secondary air injection system, respectively;
wherein the electronic control unit controls the open and closed states of the exhaust gas recirculation valve (2) and the secondary air injection valve (3) according to the rotation speed and the load of the supercharged engine (1);
the supercharged engine (1) comprises:
an engine body (4);
the first air inlet pipeline (5) is connected with the engine body (4), and a throttle valve (6) is arranged in the first air inlet pipeline (5);
an intercooler (7) connected to the first intake pipe (5);
a second air inlet pipeline (8) connected with the intercooler (7);
a third air intake line (9) communicating with the second air intake line (8);
a first exhaust line (10) connected to the engine body (4);
a second exhaust line (11) communicating with the first exhaust line (10);
a three-way catalyst (12) connected to the second exhaust line (11);
a third exhaust line (13) connected to the three-way catalyst (12);
and a supercharger (14) arranged between the second intake line (8) and the first exhaust line (10);
the secondary air injection system includes:
a secondary air injection pipe (19) connected to an exhaust manifold of the supercharged engine (1), the secondary air injection valve (3) being provided in the secondary air injection pipe (19);
a secondary air pump (20) connected to the secondary air injection pipe (19);
a connecting line (21) connected to the secondary air pump (20), the connecting line (21) communicating with the third air intake line (9);
the electronic control unit is specifically used for controlling the exhaust gas recirculation valve (2) to be closed and the secondary air injection valve (3) to be opened when the rotating speed and the load of the supercharged engine (1) meet first preset conditions;
when the rotating speed and the load of the supercharged engine (1) meet second preset conditions, controlling the exhaust gas recirculation valve (2) to be opened and the secondary air injection valve (3) to be closed;
when the rotating speed and the load of the supercharged engine (1) meet third preset conditions, controlling the exhaust gas recirculation valve (2) to be opened, and controlling the secondary air injection valve (3) to be opened;
the first preset condition specifically means that the supercharged engine (1) is in a starting and idling working condition;
the second preset condition specifically means that the supercharged engine (1) is in a medium-load to high-load non-enrichment working condition;
the third preset condition specifically means that the supercharged engine (1) is in a large-load enrichment working condition.
2. The engine control system of claim 1, wherein the exhaust gas recirculation system comprises:
a first exhaust gas recirculation line (15) communicating with the second exhaust line (11);
-an exhaust gas recirculation cooler (16) connected to the first exhaust gas recirculation line (15);
a second exhaust gas recirculation line (17) connected to the exhaust gas recirculation cooler (16);
a mixing chamber (18) connected to the second exhaust gas recirculation line (17).
3. An engine control system according to claim 2, characterized in that the exhaust gas recirculation valve (2) is arranged in the second exhaust gas recirculation line (17).
4. An engine control system according to claim 2, characterized in that the mixing chamber (18) is mounted to the third air inlet line (9).
5. The engine control system according to claim 1, characterized in that the secondary air injection pipe (19) has branch pipe portions (22) as many as the exhaust manifolds and a main injection pipe portion (23) communicating with the branch pipe portions (22);
wherein the branch pipe portion (22) is connected with the exhaust manifold;
the main injection pipe portion (23) is connected to the secondary air pump (20);
the secondary air injection valve (3) is provided in the main injection pipe portion (23).
6. An engine control system according to claim 1, characterized in that the load of the supercharged engine (1) is the output torque of the supercharged engine (1).
7. The engine control system according to claim 2, characterized by further comprising:
an air cleaner (24) provided at an air intake end of the third air intake line (9); and
an intake mixing valve (25) located between the air filter (24) and the mixing chamber (18) and arranged in the third intake line (9).
8. An automobile, comprising: an engine control system as claimed in any one of claims 1 to 7.
CN201710313462.2A 2017-05-05 2017-05-05 Engine control system and automobile Active CN108798930B (en)

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CN103352764A (en) * 2012-08-01 2013-10-16 北京博曼迪汽车科技有限公司 Engine electronic fuel injection control system based on torque control

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CN2643000Y (en) * 2003-06-13 2004-09-22 重庆力帆实业（集团）有限公司 Secondary air and jetting and exhaust gas recirculation engine
CN103352764A (en) * 2012-08-01 2013-10-16 北京博曼迪汽车科技有限公司 Engine electronic fuel injection control system based on torque control

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