CN112443407A - Method for reducing engine stop impact vibration, engine system and passenger car - Google Patents
Method for reducing engine stop impact vibration, engine system and passenger car Download PDFInfo
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- CN112443407A CN112443407A CN201910810595.XA CN201910810595A CN112443407A CN 112443407 A CN112443407 A CN 112443407A CN 201910810595 A CN201910810595 A CN 201910810595A CN 112443407 A CN112443407 A CN 112443407A
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000000446 fuel Substances 0.000 claims description 21
- 230000009467 reduction Effects 0.000 claims description 15
- 230000035939 shock Effects 0.000 claims description 9
- 238000013016 damping Methods 0.000 description 22
- 230000008569 process Effects 0.000 description 13
- 230000000694 effects Effects 0.000 description 9
- 230000009471 action Effects 0.000 description 5
- 230000002238 attenuated effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
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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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
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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
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
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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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
- F02D41/065—Introducing corrections for particular operating conditions for engine starting or warming up for starting at hot start or restart
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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
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/28—Control for reducing torsional vibrations, e.g. at acceleration
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention relates to a method for reducing engine stop impact vibration, an engine system and a passenger car. The method for reducing the impact vibration of the engine during the stop comprises the steps of serially arranging a cut-off valve on an exhaust passage through which an exhaust port of an engine cylinder is communicated with the outside and/or an air inlet passage through which an air inlet of the engine cylinder is communicated with the outside, reducing the opening degree of the cut-off valve when the engine stop condition is met, and restoring the opening degree of the cut-off valve before the engine is restarted. The engine system comprises an engine, an exhaust passage and an air inlet passage, wherein the exhaust passage and/or the air inlet passage are/is provided with a cut-off valve in series, when the stop condition of the engine is met, the controller controls the cut-off valve to reduce the opening degree of the cut-off valve, and before the engine is restarted, the controller controls the cut-off valve to recover the opening degree of the cut-off valve. The technical scheme improves the riding comfort of passengers well.
Description
Technical Field
The invention relates to a method for reducing engine stop impact vibration, an engine system and a passenger car.
Background
The engine starting and stopping system is a set of system which is automatically shut down when a vehicle is temporarily stopped (for example, waiting for a red light) in the running process, and automatically starts the engine when the vehicle needs to continue running. In recent years, an engine start-stop system for a passenger car is rapidly popularized, and the function of reducing fuel consumption and tail gas emission gradually becomes a new favorite of a vehicle enterprise. However, in some urban road environments, frequent starting and stopping of the passenger car engine seriously affects the passenger riding experience, which is mainly reflected in the following aspects:
(1) in the process of starting and stopping a passenger car engine, when the engine runs at a low rotating speed, violent shaking can be generated due to the self characteristics of the engine, and the connection of the engine and a transmission system can directly transmit the vibration excitation to a transmission system of the whole car, so that the obvious impact vibration and impact noise of the whole car are caused;
(2) the NVH optimization effect in the shutdown process of the suspension system is poor, the NVH problem caused by the shutdown process cannot be solved from the source, and in addition, the vibration transmission of an engine cannot be effectively inhibited along with the aging of the rubber suspension of the engine;
(3) in the prior art, a mode of controlling the starting rotating speed by using a reverse-driving motor exists, but in the stopping process of an engine, because the rotating speed fluctuation of a crankshaft of the engine is large, an engine rotating speed sensor cannot accurately monitor the output rotating speed and the output rotating speed of the crankshaft of the engine, the reverse-driving motor cannot accurately control the rotating speed of the engine, and the vibration transmission of the engine cannot be inhibited.
In view of the above, there is a need to improve passenger ride comfort during frequent engine start-stop conditions.
Disclosure of Invention
The invention aims to provide a method for reducing the stop shock vibration of an engine, which aims to solve the technical problem that in the prior art, under the frequent start-stop working condition of the engine, the riding comfort of passengers is poor; the invention also aims to provide an engine system capable of reducing the stop shock vibration of the engine; the invention also aims to provide the passenger car capable of improving the riding comfort of passengers under the working condition that the engine is frequently started and stopped.
In order to achieve the purpose, the technical scheme of the method for reducing the engine stop shock vibration is as follows:
the method for reducing the impact vibration of the engine stop comprises the steps of reducing the opening degree of an exhaust side block valve on an exhaust passage communicated with the outside through an exhaust port of an engine cylinder when the whole vehicle state meets the engine stop condition, and recovering the opening degree of the exhaust side block valve before the engine is restarted;
and/or when the whole vehicle state meets the engine stop condition, reducing the opening degree of an air inlet side stop valve serially arranged on an air inlet passage for communicating an air inlet of an engine cylinder with the outside, and recovering the opening degree of the air inlet side stop valve before the engine is restarted.
Has the advantages that: when the engine meets the stop condition, the opening degree of the exhaust side block valve is reduced, so that the through-flow capacity of an exhaust passage for communicating an exhaust port of an engine cylinder with the outside is reduced; and/or reducing the opening degree of the intake-side cut-off valve, thereby reducing the flow capacity of an intake passage through which the intake port of the engine cylinder communicates with the outside. In this way, a large negative pressure can be formed in the space created between the engine cylinder and the intake-side cut-off valve that communicate the passage controlled by the intake-side cut-off valve, and/or a large positive pressure can be formed in the space created between the engine cylinder and the exhaust-side cut-off valve that communicate the passage controlled by the exhaust-side cut-off valve. When the engine cylinder piston moves, the volume of the space is changed, correspondingly, the change of the volume of the space can quickly form damping force on the surface of the moving piston, and vibration energy is quickly attenuated under the action of the damping force, so that the vibration impact in the stopping process of the engine is effectively improved. In addition, before the engine is restarted, the opening degree of the exhaust side stop valve and/or the opening degree of the air inlet side stop valve are/is recovered, the flow capacity of an exhaust passage of which the exhaust port of the engine cylinder is communicated with the outside is recovered, and/or the flow capacity of an air inlet passage of which the air inlet of the engine cylinder is communicated with the outside is recovered, the damping force applied to the surface of the piston of the engine cylinder is unloaded, and the next smooth starting of the engine is not influenced. Even if the engine is in a working condition of frequent starting and stopping, the vibration impact during stopping can be effectively improved by adjusting the opening degree of the air inlet side cut-off valve and/or the air outlet side cut-off valve, the normal starting of the engine is ensured, and the riding comfort of passengers is effectively improved.
Further, when only the exhaust side cut-off valve is provided, the opening degree of the exhaust side cut-off valve is restored after the engine is stopped; when only the air inlet side block valve is arranged, the opening degree of the air inlet side block valve is recovered after the engine stops rotating; when the exhaust side cut-off valve and the intake side cut-off valve are provided, the opening degree of the exhaust side cut-off valve is restored after the engine is stopped, and the opening degree of the intake side cut-off valve is restored at the same time.
Has the advantages that: the damping force applied to the engine cylinder piston can be timely unloaded, and the engine can be smoothly started again after stopping.
Further, when only the exhaust side shut-off valve is arranged, a stop fuel cut-off instruction is sent to the engine control unit through the controller within 0.5s after the exhaust side shut-off valve is closed or the opening degree is reduced; when only the air inlet side cut-off valve is arranged, a stop fuel cut-off instruction is sent to an engine control unit through the controller within the range of 0-0.5 s after the air inlet side cut-off valve is closed or the opening degree is reduced; when the exhaust side block valve and the air inlet side block valve are arranged, a stop oil-cut instruction is sent to the engine control unit through the controller within the range of 0-0.5 s after the air inlet side block valve and the exhaust side block valve are closed or the opening degree is reduced.
Has the advantages that: sufficient pressure can be quickly established in a space formed between the engine cylinder and the exhaust side cut-off valve, which are communicated with a passage controlled by the exhaust side cut-off valve, and/or a space formed between the engine cylinder and the intake side cut-off valve, which are communicated with a passage controlled by the intake side cut-off valve, so that a sufficiently large damping force is quickly formed on the surface of the moving piston in advance, and thus, impact vibration generated after the engine is stopped is relieved.
Further, the opening degree of the intake side cut-off valve at the completion of the opening degree reduction is greater than 0 and less than or equal to 5%, or greater than 5% and less than or equal to 10%, or equal to 0; and/or the opening degree of the exhaust side cut-off valve at the completion of the opening degree reduction is less than or equal to 10% and greater than 0, or equal to 0.
Has the advantages that: the opening degree of the air inlet side cut-off valve and/or the opening degree of the exhaust side cut-off valve after being reduced corresponds to the corresponding range, so that the impact vibration generated when the engine is stopped can be reduced to the maximum degree, and the effect is obvious.
The technical scheme of the engine system provided by the invention is as follows:
the engine system includes:
the engine comprises an engine cylinder, the engine cylinder is provided with an exhaust port and an air inlet, and valves are arranged at the exhaust port and the air inlet;
an exhaust passage for communicating an exhaust port of an engine cylinder with the outside atmosphere;
an intake passage for communicating an intake port of an engine cylinder with the outside atmosphere;
a controller;
the exhaust side cut-off valve is arranged on the exhaust passage in series, when the state of the whole vehicle meets the engine stop condition, the controller controls the exhaust side cut-off valve to reduce the self opening, and before the engine is restarted, the controller controls the exhaust side cut-off valve to recover the self opening;
and/or the air inlet side cut-off valve is arranged on the air inlet passage in series, when the state of the whole vehicle meets the engine stop condition, the controller controls the air inlet side cut-off valve to reduce the self opening, and before the engine is restarted, the controller controls the air inlet side cut-off valve to recover the self opening.
Has the advantages that: when the engine meets the stop condition, the opening degree of an exhaust side block valve in an engine system is reduced, so that the through-flow capacity of an exhaust passage for communicating an exhaust port of an engine cylinder with the outside is reduced; and/or the opening degree of the intake-side cut-off valve is decreased, thereby reducing the flow capacity of the intake passage through which the intake port of the engine cylinder communicates with the outside. In this way, a large negative pressure can be formed in the space created between the engine cylinder and the intake-side cut-off valve that communicate the passage controlled by the intake-side cut-off valve, and/or a large positive pressure can be formed in the space created between the engine cylinder and the exhaust-side cut-off valve that communicate the passage controlled by the exhaust-side cut-off valve. When the engine cylinder piston moves, the volume of the space is changed, correspondingly, the change of the volume of the space can quickly form damping force on the surface of the moving piston, and vibration energy is quickly attenuated under the action of the damping force, so that the vibration impact in the stopping process of the engine is effectively improved. In addition, before the engine is restarted, the opening degree of the exhaust side stop valve and/or the opening degree of the air inlet side stop valve are/is restored, the flow capacity of the exhaust passage of the exhaust port of the engine cylinder communicated with the outside is restored, and/or the flow capacity of the air inlet passage of the engine cylinder communicated with the outside is restored, the damping force applied to the surface of the piston of the engine cylinder is unloaded, and the next smooth starting of the engine is not influenced. Even if the engine is in a working condition of frequent starting and stopping, the vibration impact during the stopping can be effectively improved by adjusting the opening degree of the air inlet side cut-off valve and/or the air outlet side cut-off valve, the normal starting of the engine is ensured, and the riding comfort of passengers is effectively improved.
Further, each engine cylinder shares the same exhaust side cut-off valve, which is provided on an exhaust main pipe communicated with each exhaust manifold; and/or all the engine cylinders share the same air inlet side cut-off valve, and the air inlet side cut-off valve is arranged on an air inlet main pipe communicated with all the air inlet manifolds.
Has the advantages that: the number of the exhaust side block valves and/or the intake side block valves can be reduced, the installation space is saved, and the use cost is reduced.
Further, when only the exhaust side cut-off valve is provided, the controller controls to restore the opening degree of the exhaust side cut-off valve immediately after the engine is stopped; when only the air inlet side block valve is arranged, the controller controls the opening degree of the air inlet side block valve to be restored after the engine stops rotating; when the exhaust-side block valve and the intake-side block valve are provided, the controller controls to restore the opening degrees of the intake-side block valve and the exhaust-side block valve immediately after the engine is stopped.
Has the advantages that: the damping force applied to the engine cylinder piston can be timely unloaded, and the engine can be smoothly started again after stopping.
Further, when only the exhaust side shut-off valve is arranged, the controller sends a shutdown fuel cut-off instruction to the engine control unit within 0-0.5 s after the exhaust side shut-off valve is closed or the opening degree is reduced; when only the air inlet side cut-off valve is arranged, the controller sends a stop fuel cut-off instruction to the engine control unit within 0-0.5 s after the air inlet side cut-off valve is closed or the opening degree is reduced; when the air inlet side block valve and the air outlet side block valve are arranged, the controller sends a stop oil-cut instruction to the engine control unit within 0-0.5 s after the air inlet side block valve and the air outlet side block valve are closed or the opening degree is reduced.
Has the advantages that: sufficient pressure can be quickly established in a space formed between an engine cylinder and an exhaust side block valve, which are communicated with a passage controlled by the exhaust side block valve, and/or a space formed between an engine cylinder and an intake side block valve, which are communicated with a passage controlled by the intake side block valve, so that sufficient damping force is quickly formed on the surface of a moving piston, the engine can be quickly stopped, and impact vibration generated after the stop is reduced.
Further, when the state of the whole vehicle meets the engine stop condition, the controller controls the opening degree of the air inlet side block valve when the opening degree is reduced to be larger than 0 and smaller than or equal to 5 percent, or larger than 5 percent and smaller than or equal to 10 percent, or equal to 0; and/or when the state of the whole vehicle meets the engine stop condition, the controller controls the opening degree of the exhaust side block valve to be less than or equal to 10% and greater than 0 or equal to 0 when the opening degree is reduced.
Has the advantages that: : the opening degree of the air inlet side cut-off valve and/or the opening degree of the exhaust side cut-off valve after being reduced corresponds to the corresponding range, so that the impact vibration generated when the engine is stopped can be reduced to the maximum degree, and the effect is obvious.
The technical scheme of the passenger car provided by the invention is as follows:
the passenger vehicle includes an engine system, the engine system comprising:
the engine comprises an engine cylinder, the engine cylinder is provided with an exhaust port and an air inlet, and valves are arranged at the exhaust port and the air inlet;
an exhaust passage for communicating an exhaust port of an engine cylinder with the outside atmosphere;
an intake passage for communicating an intake port of an engine cylinder with the outside atmosphere;
a controller;
the exhaust side cut-off valve is arranged on the exhaust passage in series, when the state of the whole vehicle meets the engine stop condition, the controller controls the exhaust side cut-off valve to reduce the self opening, and before the engine is restarted, the controller controls the exhaust side cut-off valve to recover the self opening;
and/or the air inlet side cut-off valve is arranged on the air inlet passage in series, when the state of the whole vehicle meets the engine stop condition, the controller controls the air inlet side cut-off valve to reduce the self opening, and before the engine is restarted, the controller controls the air inlet side cut-off valve to recover the self opening.
Has the advantages that: when the engine meets the stop condition, the opening degree of an exhaust side block valve in an engine system is reduced, so that the through-flow capacity of an exhaust passage for communicating an exhaust port of an engine cylinder with the outside is reduced; and/or the opening degree of the intake-side cut-off valve is decreased, thereby reducing the flow capacity of the intake passage through which the intake port of the engine cylinder communicates with the outside. In this case, the space created between the engine cylinder and the intake-side cut-off valve that communicate the passage controlled by the intake-side cut-off valve can be a space with a large negative pressure, and/or the space created between the engine cylinder and the exhaust-side cut-off valve that communicate the passage controlled by the exhaust-side cut-off valve can be a space with a large positive pressure. When the engine cylinder piston moves, the volume of the space is changed, correspondingly, the change of the volume of the space can quickly form damping force on the surface of the moving piston, and vibration energy is quickly attenuated under the action of the damping force, so that the vibration impact in the stopping process of the engine is effectively improved. In addition, before the engine is restarted, the opening degree of the exhaust side stop valve and/or the opening degree of the air inlet side stop valve are/is recovered, the flow capacity of an exhaust passage of which the exhaust port of the engine cylinder is communicated with the outside is recovered, and/or the flow capacity of an air inlet passage of which the air inlet of the engine cylinder is communicated with the outside is recovered, the damping force applied to the surface of the piston of the engine cylinder is unloaded, and the next smooth starting of the engine is not influenced. Even if the engine is in a working condition of frequent starting and stopping, the vibration impact during the stopping can be effectively improved by adjusting the opening degree of the air inlet side cut-off valve and/or the air outlet side cut-off valve, the normal starting of the engine is ensured, and the comfort degree of the passenger car is effectively improved.
Further, each engine cylinder shares the same exhaust side cut-off valve, which is provided on an exhaust main pipe communicated with each exhaust manifold; and/or all the engine cylinders share the same air inlet side cut-off valve, and the air inlet side cut-off valve is arranged on an air inlet main pipe communicated with all the air inlet manifolds.
Has the advantages that: the number of the exhaust side block valves and/or the intake side block valves can be reduced, the installation space is saved, and the use cost is reduced.
Further, when only the exhaust side cut-off valve is provided, the controller controls to restore the opening degree of the exhaust side cut-off valve immediately after the engine is stopped; when only the air inlet side block valve is arranged, the controller controls the opening degree of the air inlet side block valve to be restored after the engine stops rotating; when the exhaust-side block valve and the intake-side block valve are provided, the controller controls to restore the opening degrees of the intake-side block valve and the exhaust-side block valve immediately after the engine is stopped.
Has the advantages that: the damping force applied to the engine cylinder piston can be timely unloaded, and the engine can be smoothly started again after stopping.
Further, when only the exhaust side shut-off valve is arranged, the controller sends a shutdown fuel cut-off instruction to the engine control unit within 0-0.5 s after the exhaust side shut-off valve is closed or the opening degree is reduced; when only the air inlet side cut-off valve is arranged, the controller sends a stop fuel cut-off instruction to the engine control unit within 0-0.5 s after the air inlet side cut-off valve is closed or the opening degree is reduced; when the air inlet side block valve and the air outlet side block valve are arranged, the controller sends a stop oil-cut instruction to the engine control unit within 0-0.5 s after the air inlet side block valve and the air outlet side block valve are closed or the opening degree is reduced.
Has the advantages that: sufficient pressure can be quickly established in a space formed between an engine cylinder and an exhaust side block valve, which are communicated with a passage controlled by the exhaust side block valve, and/or a space formed between an engine cylinder and an intake side block valve, which are communicated with a passage controlled by the intake side block valve, so that sufficient damping force is quickly formed on the surface of a moving piston, the engine can be quickly stopped, and impact vibration generated after the stop is reduced.
Further, when the state of the whole vehicle meets the engine stop condition, the controller controls the opening degree of the air inlet side block valve when the opening degree is reduced to be larger than 0 and smaller than or equal to 5 percent, or larger than 5 percent and smaller than or equal to 10 percent, or equal to 0; and/or when the state of the whole vehicle meets the engine stop condition, the controller controls the opening degree of the exhaust side block valve to be less than or equal to 10% and greater than 0 or equal to 0 when the opening degree is reduced.
Has the advantages that: the opening degree of the air inlet side cut-off valve and/or the opening degree of the exhaust side cut-off valve after being reduced corresponds to the corresponding range, so that the impact vibration generated when the engine is stopped can be reduced to the maximum degree, and the effect is obvious.
Drawings
FIG. 1 is a schematic block diagram of an engine system provided by the present disclosure;
FIG. 2 is a control logic diagram for an engine shutdown event in the engine system provided by the present invention;
FIG. 3 is a schematic diagram illustrating a sequence of opening and closing intake and exhaust valves of a four-cylinder engine when the engine in the engine system provided by the present invention is a four-cylinder engine;
FIG. 4 is a graph comparing the vibration of a seat rail in a passenger car after the engine system provided by the present invention with the vibration of a seat rail in a passenger car in an original state;
FIG. 5 is a graph comparing the vibration of a torsional damper housing in a passenger vehicle after the engine system provided by the present invention with the vibration of the torsional damper housing in the passenger vehicle in an original state.
Description of reference numerals: 1-an engine air intake; 2-an air inlet side block valve control unit; 3-air inlet side block valve; 4-an engine intake duct; 5-an intake manifold; 6-an exhaust manifold; 7-engine cylinder; 8-vehicle control unit; 9-an engine control unit; 10-exhaust side shut-off valve; 11-an exhaust side cut-off valve control unit; 12-engine exhaust; 13-main exhaust pipe; 14-main intake pipe.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
Specific embodiments of the engine system of the present invention:
the engine system of the invention can be applied to not only the engine system with the engine start-stop function, but also the engine system without the engine start-stop function. In the present embodiment, an application to an engine system having an engine start/stop function is described as an example.
As shown in fig. 1, the engine system comprises an engine, a vehicle control unit 8 and an engine control unit 9, wherein the engine control unit 9 is in control connection with the engine, and the vehicle control unit 8 is in control connection with the engine control unit 9. The engine in the embodiment is a four-cylinder engine, and comprises four engine cylinders 7, wherein each engine cylinder 7 is provided with an engine air inlet 1 and an engine air outlet 12, an air inlet valve is arranged at the engine air inlet 1, and an exhaust valve is arranged at the engine air outlet 12.
The engine system further comprises an intake passage for communicating the engine intake 1 with the outside atmosphere and an exhaust passage for communicating the engine exhaust 12 with the outside atmosphere.
Wherein the intake passage comprises an engine intake conduit 4, the engine intake conduit 4 comprising an intake manifold 5 communicating with each engine cylinder 7, respectively, and an intake main 14 communicating with each intake manifold 5. The air inlet side cut-off valve 3 is arranged on the air inlet main pipe 14, the air inlet side cut-off valve 3 is positioned at the upstream of each air inlet manifold 5 and at the downstream of the throttle valve, and the engine system further comprises an air inlet side cut-off valve control unit 2 which is in control connection with the air inlet side cut-off valve 3. The vehicle control unit controls the air inlet side block valve 3 through the air inlet side block valve control unit 2, the vehicle control unit sends an instruction to the air inlet side block valve control unit 2, and the air inlet side block valve control unit 2 enables the air inlet side block valve 3 to act according to the instruction after receiving the instruction. An air filter is arranged at the upstream of the air inlet side block valve 3 to filter the air entering the engine cylinder, so that the air is not doped with impurities, and each engine cylinder 7 shares one air inlet side block valve 3, thereby reducing the number of the air inlet side block valves 3 and reducing the use cost. After the opening degree of the air inlet side cut-off valve 3 is reduced, the through-flow capacity of an air inlet passage between the engine cylinder 7 and the external atmosphere can be reduced, so that larger negative pressure can be formed in a space which is formed among the engine cylinder 7, the air inlet manifold 5 and the air inlet side cut-off valve 3 and is communicated with a passage controlled by the air inlet side cut-off valve 3, wherein the larger negative pressure refers to the condition when the air inlet side cut-off valve is not arranged; when the intake-side cut-off valve 3 returns to its opening, the flow capacity of the passage between the engine cylinder 7 and the outside atmosphere can be restored.
The exhaust passage includes exhaust manifolds 6 communicating with the respective engine cylinders 7, and exhaust main pipes 13 communicating with the respective exhaust manifolds 6. An exhaust side cut-off valve 10 is provided on the exhaust main pipe 13, and the exhaust side cut-off valve 10 is located downstream of each exhaust manifold 6 and upstream of the three-way catalyst; the engine system further includes an exhaust-side cut-off valve control unit 11 that is in control connection with the exhaust-side cut-off valve 10, the vehicle control unit controls the exhaust-side cut-off valve 10 through the exhaust-side cut-off valve control unit 11, the vehicle control unit sends a command to the exhaust-side cut-off valve control unit 11, and the exhaust-side cut-off valve control unit 11 operates the exhaust-side cut-off valve 10 according to the command after receiving the command. One exhaust side cut-off valve 10 is shared by the engine cylinders 7. After the opening degree of the exhaust side cut-off valve 10 is reduced, the flow capacity of an exhaust passage between the engine cylinder 7 and the outside atmosphere can be reduced, so that a larger positive pressure can be formed in a space established among the engine cylinder 7, the exhaust manifold 6 and the exhaust side cut-off valve 10, which is communicated with a passage controlled by the exhaust side cut-off valve 10, wherein the larger positive pressure refers to a condition when the exhaust side cut-off valve is not arranged; when the exhaust side cut-off valve 10 is restored to its opening degree, the flow capacity of the exhaust passage between the engine cylinder 7 and the outside atmosphere can be restored.
Both the intake-side cut-off valve 3 and the exhaust-side cut-off valve 10 are solenoid valves in this embodiment.
Four-cylinder engines have always one engine cylinder with its intake valve open and the other with its exhaust valve open at any time, with the remaining engine cylinders with their intake and exhaust valves fully closed, as shown in FIG. 3. The engine cylinder in which the passage controlled by the intake-side cut-off valve 3 communicates with the space capable of forming a large negative pressure between the intake manifold 5 and the intake-side cut-off valve 3 is the engine cylinder whose intake valve is open at that time. The engine cylinder in which the passage controlled by the exhaust side cut-off valve 10 communicates with the space capable of forming a large positive pressure between the exhaust manifold 6 and the exhaust side cut-off valve 10 refers to the engine cylinder in which the exhaust valve is open at that time. The engine cylinder in which both the intake valve and the exhaust valve are closed at the corresponding timing is not included in the above case.
A vehicle control unit 8, an air inlet side block valve control unit 2, an exhaust side block valve control unit 11 and an engine control unit 9 in the engine system form an electronic control system of the engine system together; the intake-side cut-off valve 3, the intake manifold 5, the engine cylinder 7, the exhaust manifold 6, and the exhaust-side cut-off valve 10 together constitute hardware of the engine system. The specific working principle of the engine system in this embodiment is shown in fig. 2, and includes two links:
a first link: under urban road environmental conditions, when a passenger car equipped with the engine system reaches an engine stop condition, the vehicle control unit 8 sends a closing command to the intake-side cutoff valve control unit 2 and the exhaust-side cutoff valve control unit 11 at the same time, the intake-side cutoff valve control unit 2 rapidly operates to reduce the opening degree of the intake-side cutoff valve 3 after receiving the closing command, and the exhaust-side cutoff valve control unit 11 also rapidly operates to reduce the opening degree of the exhaust-side cutoff valve 10 after receiving the closing command. In this embodiment, the opening of the intake side cut-off valve on the intake passage is reduced from 100% to 5%; the opening of the exhaust-side cut-off valve on the exhaust passage is reduced from 100% to 1%.
After the opening degrees of the air inlet side block valve and the air outlet side block valve are reduced for 0.5s, a stop fuel cut instruction is sent to the engine control unit 9 through the vehicle control unit 8. At this time, a large negative pressure is established in a space formed by the engine cylinder 7, the intake manifold 5, and the intake side cut-off valve 3; a large positive pressure is established in the space formed by the engine cylinder 7, the exhaust manifold 6, and the exhaust side cut-off valve 10. The volume of the two spaces can be changed by the movement of the engine cylinder piston, the change of the volume of the two spaces can quickly form damping force on the surface of the moving engine cylinder piston, the magnitude of the two damping forces is in direct proportion to the movement speed of the engine cylinder piston, the larger the fluctuation of the engine speed is, the damping force acts on the surface of the moving piston of the engine cylinder 7, so that the torque fluctuation and load impact of the engine in the process from idle speed to complete stop can be more effectively controlled, and the vibration energy generated by the engine is quickly attenuated under the action of the two damping forces, so that the vibration impact of the engine on the whole vehicle in the stop process of the passenger vehicle is relieved, and the riding comfort of passengers is further improved.
In the first link, it should be noted that, in order to ensure the durability and safety of the intake side block valve, the vibration impact of the engine on the whole vehicle during the shutdown process of the passenger vehicle can be better alleviated only by reducing the opening degrees of the intake side block valve and the exhaust side block valve by the set values. In this embodiment, after the opening degree of the intake-side cut-off valve is reduced by 0.5s, the vehicle control unit 8 sends a stop fuel cut-off command to the engine control unit 9, that is, the opening degree of the intake-side cut-off valve is reduced first, so that a certain negative pressure is formed in the cylinder of the engine, and then the stop fuel cut-off command is sent to the engine control unit 9, so as to establish a sufficient negative pressure in the space in advance, so as to quickly form a sufficient damping force. In the same way, in order to ensure the durability and the safety of the exhaust side block valve, the vibration impact of the engine on the whole vehicle in the stop process of the passenger vehicle can be better relieved only by reducing the opening of the exhaust side block valve to a set value. In this embodiment, after the opening of the exhaust side cut-off valve is reduced by 0.5s, the vehicle control unit 8 sends a stop fuel cut-off command to the engine control unit 9, that is, the opening of the exhaust side cut-off valve is reduced first, so that a certain positive pressure is formed in the engine cylinder, and then the stop fuel cut-off command is sent to the engine control unit 9, so as to establish a sufficient positive pressure in the space in advance, so as to quickly form a sufficient damping force.
And a second link: after the vehicle control unit 8 determines that the engine is stalled, the vehicle control unit 8 sends an opening command to the intake-side cutoff valve control unit 2 and the exhaust-side cutoff valve control unit 11 at the same time, and the intake-side cutoff valve control unit 2 and the exhaust-side cutoff valve control unit 11 respectively command the intake-side cutoff valve 3 and the exhaust-side cutoff valve 10 to perform the operation of restoring the respective opening degrees after receiving the opening command. After the air inlet side block valve 3 recovers the opening degree, the through-flow capacity between the space among the engine cylinder 7, the air inlet manifold 5 and the air inlet side block valve 3 and the external atmosphere is recovered, and the negative pressure environment established in the engine stopping process in one link is damaged; in addition, after the exhaust side cut-off valve 10 recovers its opening, the through-flow capacity between the space between the engine cylinder 7, the exhaust manifold 6 and the exhaust side cut-off valve 10 and the outside is recovered, and the positive pressure environment established during the engine stop in the first link is destroyed, so that the damping force acting on the surface of the engine cylinder piston disappears, and the engine is ready for the next smooth start-up of the engine.
As shown in FIGS. 4 and 5, when the engine system is adopted, the vibration at the seat rail at the key point of the passenger car body vibrates from the original state of 1.21 m.s-1.75Down to 0.82 m.s-1.75The total decrease is 32%; the torsional damper shell vibrates from 7.91 m.s-1.75Down to 5.89 m.s-1.75The overall reduction is 26%, and the NVH optimization effect is obvious.
The restoration of the opening degrees of the intake side cut-off valve and the exhaust side cut-off valve in this embodiment refers to the opening degrees of the intake side cut-off valve and the exhaust side cut-off valve when the engine is restored to normal operation, and according to the actual use situation, the opening degree of the cut-off valve may be 100% or less than 100% when the engine is in normal operation.
In the above embodiment, the intake side shutoff valve is provided in the intake main pipe of the intake passage, and the exhaust side shutoff valve is provided in the exhaust main pipe of the exhaust passage, but in other embodiments, the intake side shutoff valve may be provided only in the intake main pipe of the intake passage, and the exhaust side shutoff valve may not be provided in the exhaust main pipe of the exhaust passage; alternatively, the exhaust side shutoff valve may be provided only in the exhaust main pipe of the exhaust passage, and the intake side shutoff valve may not be provided in the intake main pipe of the intake passage.
In the above embodiments, the engine cylinders share one exhaust-side cut-off valve and one intake-side cut-off valve, and in other embodiments, one exhaust-side cut-off valve may be respectively provided at the exhaust manifold of each engine cylinder according to the number of cylinders of the engine; on the basis that the exhaust manifold of each engine cylinder is respectively provided with one exhaust side block valve, one air inlet side block valve can be respectively arranged at the air inlet manifold of each engine cylinder according to the number of the cylinders of the engine, and one air inlet side block valve can also be shared. It should be noted here that even if each exhaust manifold is provided with an exhaust side block valve, or each intake manifold is provided with an intake side block valve, when the state of the whole vehicle meets the engine stop condition, only the intake side block valve on the intake manifold of the engine cylinder with an opened intake valve and/or the exhaust side block valve on the exhaust manifold of the engine cylinder with an opened exhaust valve need to be closed, and each intake side block valve can share the same intake side block valve control unit or respectively correspond to one intake side block valve control unit; of course, in other embodiments, the intake-side block valve may also be integrated with the control unit, and at this time, the vehicle control unit may directly send a command to the control unit on the intake-side block valve.
In the above embodiment, when the engine satisfies the stop condition, the opening degree of the intake side cut-off valve is reduced from 100% to 5%, and in other embodiments, the opening degree of the intake side cut-off valve when the engine satisfies the stop condition may also be reduced from 100% to 5% or less, and at this time, the smaller the opening angle, the higher the requirement for the intake side cut-off valve, and the higher the corresponding machining cost. Certainly, the opening degree of the air inlet side block valve can also be reduced to 5%, 10%, or more than 5% and less than 10%, or more than 10%, and only the requirement that the opening degree is smaller than that of the air inlet side block valve in normal work is met, but when the opening degree is reduced too small, the vibration reduction effect is limited, specific values of the opening degree reduction are different according to engines of different models, and the effect is best when the opening degree is reduced to 0-5%.
In the above embodiment, when the engine meets the stop condition, the opening degree of the exhaust side cut-off valve is reduced from 100% to 1%, in other embodiments, the opening degree of the exhaust side cut-off valve under the condition that the engine meets the stop condition may also be reduced from 100% to 10%, or reduced to more than 1% and less than 10%, the opening degree needs to be adjusted correspondingly according to the magnitude of the exhaust pressure of the engine, the larger the exhaust pressure is, the larger the opening degree of the exhaust side cut-off valve needs to be adjusted correspondingly, otherwise, the opening degree of the exhaust side cut-off valve is adjusted smaller. Of course, the opening degree of the exhaust side shut-off valve may be reduced to 10% or less or 1% or less, and it is only necessary to be smaller than the opening degree of the exhaust side shut-off valve when the exhaust side shut-off valve is in normal operation, but when the opening degree of the exhaust side shut-off valve is reduced too much, the effect of vibration reduction is limited, and the specific value of the reduction of the opening degree is different according to engines of different models, but the effect is best when the opening degree is reduced to 0 to 10%.
Of course, in other embodiments, the opening degrees of the intake-side cut-off valve and the exhaust-side cut-off valve may also be reduced to 0%, i.e., the intake-side cut-off valve and the exhaust-side cut-off valve are fully closed. At the moment, when the engine meets a stop condition, an engine stop instruction is simultaneously sent to the engine control unit, the air inlet side block valve control unit and the exhaust side block valve control unit through the vehicle control unit, the air inlet side block valve control unit closes the air inlet side block valve after receiving a closing instruction, and the exhaust side block valve control unit closes the exhaust side block valve after receiving the closing instruction; and within 0.5s after the air inlet side cut-off valve and the air exhaust side cut-off valve are closed, sending a stop fuel cut-off instruction to an engine control unit through the whole vehicle controller. After the engine stops rotating and needs to be restarted, the vehicle control unit sends an opening command to the air inlet side block valve control unit and the air outlet side block valve control unit at the same time, and the air inlet side block valve control unit and the air outlet side block valve control unit respectively command the air inlet side block valve and the air outlet side block valve to execute opening actions after receiving the opening command.
In the above embodiment, after the opening degrees of the intake side block valve and the exhaust side block valve are reduced by 0.5s, the vehicle control unit sends a stop and oil-cut instruction to the engine control unit, however, in other embodiments, the interval time between the completion of the reduction of the opening degrees of the intake side block valve and the exhaust side block valve and the sending of the stop and oil-cut instruction by the controller may be adjusted in a matching manner according to the actual working condition, and may be any time within the range of 0s to 0.5s, that is, within the range of 0s to 0.5s after the completion of the reduction of the opening degrees of the intake side block valve and the exhaust side block valve, the vehicle control unit sends the stop and oil-cut instruction to the engine control unit; of course, the opening degree of the intake-side cut-off valve and the exhaust-side cut-off valve is decreased simultaneously with the controller sending the stop fuel cut-off command, depending on the actual engine parameter type.
In the above embodiments, the engine in the engine system is a four-cylinder engine, in other embodiments, a three-cylinder engine may also be used, and other types of gas or fuel type engines may also be used.
According to the specific embodiment of the passenger car provided by the invention, the passenger car comprises the engine system, and the structure of the engine system is the same as that of the engine system, so that the details are not repeated.
The method comprises the steps of arranging an exhaust side stop valve in an exhaust passage where an exhaust port of an engine cylinder is communicated with the outside, arranging an air inlet side stop valve in an air inlet passage where an air inlet of the engine cylinder is communicated with the outside, and reducing the opening degrees of the exhaust side stop valve and the air inlet side stop valve simultaneously when an engine stop condition is met, so that the through-flow capacity of the exhaust passage where the exhaust port of the engine cylinder is communicated with the outside and the through-flow capacity of the air inlet passage where the air inlet of the engine cylinder is communicated with the outside are reduced. In this embodiment, the opening degree of the intake side cut-off valve on the intake passage is reduced from 100% to 5%; the opening degree of the exhaust-side cut-off valve on the exhaust passage is reduced from 100% to 1%; and sending a stop fuel cut-off instruction to the engine control unit through the vehicle control unit within 0-0.5 s after the reduction of the opening degrees of the air inlet side cut-off valve and the air exhaust side cut-off valve is completed. The method further includes restoring the opening degrees of the exhaust side cut-off valve and the intake side cut-off valve, and restoring the flow capacity of the passage controlled by the exhaust side cut-off valve and the intake side cut-off valve, when the engine is stopped. The generator system in the embodiment can be adopted in the method for reducing the engine stop shock vibration, and the air inlet side block valve and the air outlet side block valve in the method have the same structures as those of the air inlet side block valve and the air outlet side block valve in the generator system and the passenger car embodiment, and the using method is also the same.
In the above embodiments, when the engine meets the stop condition, the opening degree of the intake side cut-off valve is reduced from 100% to 5%, the opening degree of the exhaust side cut-off valve is reduced from 100% to 1%, and the entire vehicle controller sends the stop/fuel-off command to the engine control unit within 0 to 0.5s after the opening degree reduction of the intake side cut-off valve and the exhaust side cut-off valve is completed.
In other embodiments, the method of reducing the engine stop shock vibration may also be such that the exhaust side cut-off valve is provided only in the exhaust passage where the exhaust port of the engine cylinder communicates with the outside, and the intake side cut-off valve is not provided in the intake passage where the intake port of the engine cylinder communicates with the outside. Alternatively, in another embodiment, the intake-side cut-off valve may be provided only in an intake passage where the intake port of the engine cylinder communicates with the outside, and the exhaust-side cut-off valve may not be provided in an exhaust passage where the exhaust port of the engine cylinder communicates with the outside.
Claims (10)
1. The method for reducing the engine stop shock vibration is characterized in that: when the whole vehicle state meets the engine stop condition, the opening degree of an exhaust side block valve (10) which is serially arranged on an exhaust passage of an exhaust port of an engine cylinder (7) and communicated with the outside is reduced, and the opening degree of the exhaust side block valve (10) is recovered before the engine is restarted;
and/or when the state of the whole vehicle meets the engine stop condition, reducing the opening degree of an air inlet side cut-off valve (3) serially arranged on an air inlet passage for communicating an air inlet of an engine cylinder (7) with the outside, and recovering the opening degree of the air inlet side cut-off valve (3) before the engine is restarted.
2. The method of reducing engine stop shock vibrations according to claim 1, characterized in that: when only the exhaust-side cut-off valve (10) is provided, the opening degree of the exhaust-side cut-off valve (10) is restored after the engine is stopped;
when only the air inlet side block valve (3) is arranged, the opening degree of the air inlet side block valve (3) is recovered after the engine stops rotating;
when an exhaust-side cutoff valve (10) and an intake-side cutoff valve (3) are provided, the opening degree of the exhaust-side cutoff valve (10) is restored after the engine is stopped, and the opening degree of the intake-side cutoff valve (3) is restored at the same time.
3. The method of reducing engine stop shock vibrations according to claim 1, characterized in that: when only the exhaust side cut-off valve (10) is arranged, a stop fuel cut-off instruction is sent to an engine control unit through a controller within the range of 0-0.5 s after the reduction of the opening degree of the exhaust side cut-off valve (10) is completed;
when only the air inlet side cut-off valve (3) is arranged, a stop fuel cut-off instruction is sent to an engine control unit through the controller within the range of 0-0.5 s after the opening degree of the air inlet side cut-off valve (3) is reduced;
when the exhaust side block valve (10) and the air inlet side block valve (3) are arranged, a stop fuel cut-off instruction is sent to an engine control unit through a controller within the range of 0-0.5 s after the opening degrees of the air inlet side block valve (3) and the exhaust side block valve (10) are reduced.
4. The method of reducing engine stop shock vibrations according to claim 1, characterized in that: the opening degree of the intake-side cut-off valve (3) at the completion of the opening degree reduction is greater than 0 and less than or equal to 5%, or greater than 5% and less than or equal to 10%, or equal to 0; and/or the opening degree of the exhaust-side cut-off valve (10) at the completion of the opening degree reduction is less than or equal to 10% and greater than 0, or equal to 0.
5. An engine system, comprising:
the engine comprises an engine cylinder (7), wherein the engine cylinder (7) is provided with an exhaust port and an air inlet, and valves are arranged at the exhaust port and the air inlet;
an exhaust passage for communicating an exhaust port of the engine cylinder (7) with the outside atmosphere;
an intake passage for communicating an intake port of an engine cylinder (7) with the outside atmosphere;
the method is characterized in that: the engine system includes a controller that is configured to control,
an exhaust side cut-off valve (10) is arranged in series on an exhaust passage, when the state of the whole vehicle meets the engine stop condition, the controller controls the exhaust side cut-off valve (10) to reduce the self opening, and before the engine is restarted, the controller controls the exhaust side cut-off valve (10) to recover the self opening;
and/or the air inlet side cut-off valve (3) is arranged in series on the air inlet passage, when the state of the whole vehicle meets the engine stop condition, the controller controls the air inlet side cut-off valve (3) to reduce the self opening, and before the engine is restarted, the controller controls the air inlet side cut-off valve (3) to recover the self opening.
6. The engine system of claim 5, wherein: each engine cylinder (7) shares the same exhaust side shut-off valve (10), and the exhaust side shut-off valves (10) are arranged on exhaust main pipes (13) communicated with each exhaust manifold (6); and/or each engine cylinder (7) shares the same intake side cut-off valve (3), and the intake side cut-off valve (3) is arranged on an intake main pipe (14) communicated with each intake manifold (5).
7. The engine system of claim 5, wherein: when only the exhaust side cut-off valve (10) is provided, the controller controls to restore the opening degree of the exhaust side cut-off valve (10) immediately after the engine is stopped; when only the air inlet side block valve (3) is arranged, the controller controls the opening degree of the air inlet side block valve (3) to be recovered after the engine stops rotating; when the exhaust side cut-off valve (10) and the intake side cut-off valve (3) are provided, the controller controls to restore the opening degrees of the intake side cut-off valve (3) and the exhaust side cut-off valve (10) immediately after the engine is stopped.
8. The engine system according to claim 5, 6 or 7, characterized in that: when only the exhaust side shut-off valve (10) is arranged, the controller sends a shutdown fuel cut-off instruction to the engine control unit within 0-0.5 s after the opening of the exhaust side shut-off valve (10) is reduced;
when only the air inlet side cut-off valve (3) is arranged, the controller sends a stop fuel cut-off instruction to the engine control unit within the range of 0-0.5 s after the opening degree of the air inlet side cut-off valve (3) is reduced;
when the air inlet side block valve (3) and the air outlet side block valve (10) are arranged, the controller sends a stop oil-cut instruction to the engine control unit within 0-0.5 s after the air inlet side block valve and the air outlet side block valve are closed or the opening degree is reduced.
9. The engine system according to claim 5, 6 or 7, characterized in that: when the whole vehicle state meets the engine stop condition, the controller controls the opening degree of the air inlet side block valve (3) when the opening degree is reduced to be larger than 0 and smaller than or equal to 5 percent, or larger than 5 percent and smaller than or equal to 10 percent, or equal to 0; and/or when the state of the whole vehicle meets the engine stop condition, the controller controls the opening degree of the exhaust side block valve (10) to be less than or equal to 10% and greater than 0 or equal to 0 when the opening degree reduction is completed.
10. Passenger train, including the engine system, its characterized in that: the engine system is as claimed in any one of claims 5 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910810595.XA CN112443407A (en) | 2019-08-29 | 2019-08-29 | Method for reducing engine stop impact vibration, engine system and passenger car |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910810595.XA CN112443407A (en) | 2019-08-29 | 2019-08-29 | Method for reducing engine stop impact vibration, engine system and passenger car |
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| CN201910810595.XA Pending CN112443407A (en) | 2019-08-29 | 2019-08-29 | Method for reducing engine stop impact vibration, engine system and passenger car |
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Cited By (1)
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| CN118640106A (en) * | 2024-08-14 | 2024-09-13 | 潍柴动力股份有限公司 | Engine shutdown method, device, storage medium and vehicle |
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| JP2000257458A (en) * | 1999-03-04 | 2000-09-19 | Mitsubishi Motors Corp | Stop control device for internal combustion engine |
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