CN110748442A - Throttle-free air inlet system of spark ignition engine and power control method - Google Patents
Throttle-free air inlet system of spark ignition engine and power control method Download PDFInfo
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- CN110748442A CN110748442A CN201910926441.7A CN201910926441A CN110748442A CN 110748442 A CN110748442 A CN 110748442A CN 201910926441 A CN201910926441 A CN 201910926441A CN 110748442 A CN110748442 A CN 110748442A
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- engine
- butterfly valve
- control unit
- electronic control
- intercooler
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Classifications
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- 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
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
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- 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
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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
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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
- F02D41/0025—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]
-
- 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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
-
- 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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1486—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor with correction for particular operating conditions
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- 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)
- Supercharger (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention relates to a throttle-free air inlet system of a spark-ignition engine, which comprises an air inlet pipe (2), a supercharger (4), an intercooler (7), an intercooler air outlet pipe (5) and an engine (1) which are sequentially communicated, wherein the supercharger (4), the intercooler (7) and the engine (1) are all connected with an electronic control unit (9), the air inlet pipe (2) is communicated with the intercooler air outlet pipe (5) through a butterfly valve (6), and the electronic control unit (9) controls the opening degree of the butterfly valve (6). Compared with the prior art, the engine air pumping loss is reduced and the economic performance of the engine is improved without a throttle valve.
Description
Technical Field
The invention relates to the field of electronic control of engines, in particular to a throttle-free air intake system of a spark ignition engine and a power control method.
Background
The air of a system of the ignition type engine enters a cylinder and sequentially passes through an air filter, a supercharger, an intercooler, a throttle valve and an air inlet manifold, the air inlet amount of the throttle valve can be adjusted, but the air pumping loss of the engine is brought by the throttle valve, and the economic performance of the engine is reduced.
There are various realization modes for realizing no throttle valve in an engine air intake system, and at present, the adjustment of air intake amount is realized mainly by adjusting the valve timing, the valve opening duration and the valve lift. The method has high requirements on an engine air distribution system, and brings great increase of cost. Meanwhile, for some heavy ignition engines such as commercial vehicles and generator sets, the adjustment of the air inflow by adjusting the valve is difficult to realize.
The specification of Chinese invention patent CN106194513A discloses a gasoline engine system without throttle control and a control method, and the method mainly replaces the method of controlling the load of a gasoline engine throttle by external intercooling EGR and variable valve phase timing. The chinese invention patent CN104018961A specification discloses an air intake pipeline system of a supercharged engine, which reduces the length of an air intake flow passage and the flow resistance through an air intake bypass valve and a short bypass circuit under a small load, but the bypass valve cannot perform opening control, and is closed under a large load, and a throttle still exists in the system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a non-throttle air inlet system of a spark ignition engine and a power control method.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a spark-ignition engine does not have throttle air intake system, is including intake pipe, booster, intercooler outlet duct and the engine that communicates in proper order, booster, intercooler and engine all be connected with the electronic control unit, intake pipe and intercooler outlet duct pass through the butterfly valve intercommunication, the electronic control unit carry out aperture control to the butterfly valve.
The engine is communicated with the exhaust pipe, and a waste gas bypass valve is arranged between the exhaust pipe and the outlet of the engine.
The butterfly valve is an electric control butterfly valve.
A power control method using the unthrottled intake system of a spark-ignition engine, the method comprising the steps of:
step S1: obtaining the working condition and the working state of the supercharger;
step S2: judging the working condition, if the torque demand is lower than the limit value, controlling the operation of a set number of cylinders by the electronic control unit, and controlling the opening of the butterfly valve based on the working state of the supercharger and the demanded air inflow; if the torque demand is not lower than the limit value, the electronic control unit controls all cylinders to operate, and controls the opening of the butterfly valve based on the working state of the supercharger and the demanded intake air amount.
The electronic control unit realizes the opening control of the butterfly valve through a PID closed loop.
And the required air inflow is the sum of the calibrated air inflow and the air inflow correction value.
The intake air amount correction value is obtained based on the number of operating cylinders and the accelerator pedal position.
After running for a certain time, the electronic control unit alternates the running cylinder with the non-running cylinder.
Compared with the prior art, the invention has the following advantages:
(1) the air inlet pipe is communicated with the air outlet pipe of the intercooler through a butterfly valve, and the electronic control unit controls the opening of the butterfly valve, so that the air inflow is controlled, a throttle valve is not needed, the pumping loss of the engine is reduced, and the economic performance of the engine is improved.
(2) By cooperatively adjusting the number of cylinders in the operation of the engine and the opening of the butterfly valve, the control requirement of the power of the engine can be met under the condition of no throttle, and the economy is improved.
Drawings
FIG. 1 is a schematic illustration of a non-throttle system of the present invention;
FIG. 2 is a flow chart of a power control method of the present invention;
FIG. 3 is a schematic of the power control strategy of the present invention;
reference numerals:
1 is an engine; 2 is an air inlet pipe; 3 is an exhaust pipe; 4 is a supercharger; 5 is an intercooler air outlet pipe; 6 is a butterfly valve; an intercooler 7; 8 is a waste gate valve; and 9 is an electronic control unit.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Examples
The embodiment provides a throttle-free air inlet system of a spark-ignition engine, as shown in fig. 1, the throttle-free air inlet system comprises an air inlet pipe 2, a supercharger 4, an intercooler 7, an intercooler air outlet pipe 5 and an engine 1 which are sequentially communicated, wherein the supercharger 4, the intercooler 7 and the engine 1 are all connected with an electronic control unit 9(ECU), the air inlet pipe 2 is communicated with the intercooler air outlet pipe 5 through a butterfly valve 6, a pipeline for communicating the air inlet pipe 2 with the intercooler air outlet pipe 5 is called a bypass loop, the butterfly valve 6 is an electric control butterfly valve, the electronic control unit 9 controls the opening degree of the butterfly valve 6, the engine 1 is communicated with an exhaust pipe 3, and a waste gas bypass; the air inlet pipe 2 is communicated with the intercooler air outlet pipe 5 through a butterfly valve 6, and the electronic control unit 9 controls the opening of the butterfly valve 6, so that the air inflow is controlled, a throttle valve is not needed, the pumping loss of the engine is reduced, and the economic performance of the engine 1 is improved.
The present embodiment also provides a power control method using a non-throttle intake system of a spark ignition engine, as shown in fig. 2, including the following steps:
step S1: obtaining the working condition and the working state of the supercharger 4; step S2: judging the working condition, if the torque demand is lower than the limit value, controlling the operation of a set number of cylinders by the electronic control unit 9, and controlling the opening of the butterfly valve 6 based on the working state of the supercharger 4 and the demanded air inflow; if the torque demand is not lower than the limit value, the electronic control unit 9 controls all cylinders to operate, and controls the opening of the butterfly valve 6 based on the working state of the supercharger 4 and the demanded intake air amount; by cooperatively adjusting the number of operating cylinders of the engine 1 and the opening of the butterfly valve 6, the power control requirement of the engine 1 can be met under the condition of no throttle, and the economy is improved.
Specifically, the electronic control unit 9 controls the opening degree of the butterfly valve 6 by a PID closed loop.
The required air inflow is the sum of the calibrated air inflow and the air inflow correction value.
The intake air amount correction value is obtained from the corresponding correction MAP according to the number of operating cylinders, the position of an accelerator pedal and the like, and is obtained according to the engine speed and the intake pressure.
Preferably, after a certain time of operation, the electronic control unit 9 alternates between the cylinders that are in operation and the cylinders that are not in operation, in order to maintain the cylinder temperature and to ensure the thermal load uniformity of the engine 1.
The power control method can be divided into two parts:
(1) bypass loop control
When a bypass circuit is used, the intake air trend can be divided into two cases:
under the condition that the supercharger 4 does not work or the engine speed is not high, gas is not supercharged, when the bypass circuit is opened (namely the butterfly valve 6 is opened), a certain proportion of gas bypasses the supercharger 4 and directly leads to the intercooler air outlet pipe 5 from a short channel of the bypass circuit, the flowing distance of the gas is reduced, and the flow loss is reduced.
When the supercharger 4 works and the pressure of the supercharged gas is higher, the bypass circuit can lead part of the supercharged gas back to the air inlet pipe 2 at the moment, and the actual air inflow of the engine 1 is reduced.
By controlling the opening of the butterfly valve 6, the amount of gas passing through the bypass circuit can be controlled, and the actual intake air amount of the engine 1 can be controlled. When the load of the engine 1 is not high (i.e., the torque demand is lower than the limit), the electronic control unit 9 controls the opening of the butterfly valve 6 according to the demanded intake air amount and the operating state of the supercharger 4, and obtains the appropriate intake air amount. When the engine 1 is in a middle and high load interval (namely the torque demand is not lower than the limit value), the butterfly valve 6 is gradually closed, and a larger air inflow is obtained.
(2) Cylinder deactivation control
Under the working condition that the power demand of the engine 1 is smaller, the ECU controls the fuel supply of partial cylinders, reduces the number of the operated cylinders, controls the operation state of each cylinder and achieves the aim of controlling the torque output of the engine 1. Taking an inline six-cylinder engine as an example, when the torque demand of the engine 1 is not lower than a limit value (e.g., 30%), all of the six cylinders of the engine 1 are normally operated. When the torque demand of the engine 1 is lower than the limit value, the number of cylinders actually operated (e.g., 30% to 20% load of five cylinders, 20% to 10% load of four cylinders, 10% to 0% load of three cylinders) is controlled according to the magnitude of the load. Under the condition that the number of the working cylinders is reduced, the working point of each cylinder is adjusted by combining the control of air inflow, so that the working cylinders can run in a region with better economical efficiency, and the purposes of controlling load and improving economical efficiency are achieved.
Different combination control is performed for different loads, and the combination control strategy is shown in fig. 3:
(1) low load operation
The bypass circuit control and the cylinder deactivation control are simultaneously used under a small load condition to control the power output of the engine 1. The engine 1 selects the number of the operating cylinders according to the required power output, and after the number of the operating cylinders is determined, the opening degree of the butterfly valve 6 is controlled according to the required air inflow and the working state of the supercharger 4, so that the required power output is adjusted.
(2) Medium and high load conditions
At this time, all cylinders of the engine 1 participate in working, namely cylinder deactivation control is not used, the opening degree of the butterfly valve 6 is controlled according to the requirement of air inflow and the working state of the supercharger 4, the air inflow is controlled, and the power output of the engine 1 is adjusted.
Claims (8)
1. The utility model provides a no throttle air intake system of spark-ignition engine, is including intake pipe (2), booster (4), intercooler (7), intercooler outlet duct (5) and engine (1) that communicate in proper order, booster (4), intercooler (7) and engine (1) all be connected with electronic control unit (9), its characterized in that, intake pipe (2) and intercooler outlet duct (5) communicate through butterfly valve (6), electronic control unit (9) carry out aperture control to butterfly valve (6).
2. A throttleless intake system of a spark ignition engine according to claim 1, wherein said engine (1) is connected to an exhaust pipe (3), and a waste gate valve (8) is provided between the exhaust pipe (3) and an outlet of the engine (1).
3. A throttleless intake system of a spark-ignition engine according to claim 1, wherein said butterfly valve (6) is an electrically controlled butterfly valve.
4. A power control method using the unthrottled intake system of a spark ignition engine according to claim 1, characterized by comprising the steps of:
step S1: obtaining the working condition and the working state of the supercharger (4);
step S2: judging the working condition, if the torque demand is lower than the limit value, controlling the operation of a set number of cylinders by the electronic control unit (9), and controlling the opening of the butterfly valve (6) based on the working state of the supercharger (4) and the demanded air inflow; if the torque demand is not lower than the limit value, the electronic control unit (9) controls all cylinders to operate, and controls the opening of the butterfly valve (6) based on the operating state of the supercharger (4) and the demanded intake air amount.
5. A power control method according to claim 4, characterized in that the electronic control unit (9) controls the opening of the butterfly valve (6) by means of a PID closed loop.
6. A power control method according to claim 4, characterized in that the demanded intake air amount is the sum of the calibrated intake air amount and the intake air amount correction value.
7. A power control method according to claim 6, characterized in that the intake air amount correction value is obtained based on the number of operating air cylinders and the accelerator pedal position.
8. A power control method according to claim 4, characterized in that after a certain time of operation, the electronic control unit (9) alternates between operating cylinders and non-operating cylinders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910926441.7A CN110748442A (en) | 2019-09-27 | 2019-09-27 | Throttle-free air inlet system of spark ignition engine and power control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910926441.7A CN110748442A (en) | 2019-09-27 | 2019-09-27 | Throttle-free air inlet system of spark ignition engine and power control method |
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| CN110748442A true CN110748442A (en) | 2020-02-04 |
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| CN201910926441.7A Pending CN110748442A (en) | 2019-09-27 | 2019-09-27 | Throttle-free air inlet system of spark ignition engine and power control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114294099A (en) * | 2021-11-19 | 2022-04-08 | 东风商用车有限公司 | Engine intake flow and temperature compensation management system |
| CN114294094B (en) * | 2021-11-19 | 2023-05-12 | 东风商用车有限公司 | Dynamic air compensation system with bypass heat exchange function for engine |
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2019
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| CN114294094B (en) * | 2021-11-19 | 2023-05-12 | 东风商用车有限公司 | Dynamic air compensation system with bypass heat exchange function for engine |
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