CN113389645A - Hybrid electric vehicle and control method for eliminating start-up jitter - Google Patents
Hybrid electric vehicle and control method for eliminating start-up jitter Download PDFInfo
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- CN113389645A CN113389645A CN202110817165.8A CN202110817165A CN113389645A CN 113389645 A CN113389645 A CN 113389645A CN 202110817165 A CN202110817165 A CN 202110817165A CN 113389645 A CN113389645 A CN 113389645A
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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
- F02D41/02—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
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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
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
- F02M35/10229—Fluid connections to the air intake system; their arrangement of pipes, valves or the like the intake system acting as a vacuum or overpressure source for auxiliary devices, e.g. brake systems; Vacuum chambers
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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
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
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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
- F02D2041/0022—Controlling intake air for diesel engines by throttle control
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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
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
Abstract
The invention discloses a hybrid electric vehicle and a control method for eliminating start-up jitter, and belongs to the technical field of hybrid electric vehicles. Hybrid vehicle includes motor, engine and vehicle control unit, and the engine is started to reaching the target rotational speed by the motor to carry out the oil spout ignition, and vehicle control unit is connected with motor control, and the engine includes: an intake manifold having a throttle valve connected to one end thereof; the vacuum tank is connected with the intake manifold, an electromagnetic valve is connected to the vacuum tank and used for opening or closing the vacuum tank, and the electromagnetic valve is in control connection with the vehicle control unit; the cylinder body is connected to the other end of the intake manifold, a piston is arranged in the cylinder body, and the piston can perform compression stroke between the upper dead point and the lower dead point of the piston; and the engine management system is in communication connection with the whole vehicle controller. Has the advantages that: the engine starting shaking problem can be fundamentally solved.
Description
Technical Field
The invention relates to the technical field of hybrid electric vehicles, in particular to a hybrid electric vehicle and a control method for eliminating start-up jitter.
Background
Hybrid vehicles have been widely developed due to their excellent performance characteristics. In a hybrid electric vehicle, after an engine is usually dragged to a target rotating speed by a motor, the engine is subjected to oil injection and ignition so as to enter a circulating working mode; and the target rotating speed of the engine is higher than the fuel injection rotating speed of the engine of the traditional automobile, and in order to accelerate the engine to run to the target rotating speed, the engine needs to go through several compression strokes before fuel injection and ignition.
Because residual air is reserved in an intake manifold of the engine, when a piston of the engine moves from a top dead center to a bottom dead center, air in the intake manifold is sucked into a cylinder body, so that the air pressure in the cylinder body is high when the piston moves from the bottom dead center to the top dead center, and the vehicle shakes when being started due to the high air pressure, and the driving comfort is affected.
In order to solve the problems, when an engine of a hybrid electric vehicle is started at present, a driving motor is locked, so that the vibration of the engine cannot be amplified through a mechanical structure such as a gearbox, the vibration of the vehicle caused by the engine starting can be reduced, and the driving comfort of the vehicle is improved; but the vibration is only reduced on the transmission chain of the hybrid electric vehicle, namely the effect of reducing the vibration transmission can be achieved, and the problem of starting vibration of the engine is not fundamentally solved.
In view of the above, it is desirable to design a hybrid vehicle and a control method for eliminating the start-up jitter to solve the above problems.
Disclosure of Invention
One object of the present invention is to provide a hybrid vehicle that can fundamentally solve the problem of engine starting hunting.
In order to achieve the purpose, the invention adopts the following technical scheme:
a hybrid electric vehicle comprises a motor, an engine and a vehicle control unit, wherein the engine is started by the motor to reach a target rotating speed so as to perform oil injection ignition, the vehicle control unit is in control connection with the motor, and the engine comprises:
an intake manifold having a throttle valve connected to one end thereof;
the vacuum tank is connected with the intake manifold, an electromagnetic valve is connected to the vacuum tank and used for opening or closing the vacuum tank, and the electromagnetic valve is in control connection with the vehicle control unit;
the cylinder body is connected to the other end of the intake manifold, a piston is arranged in the cylinder body, and the piston can perform a compression stroke between the upper dead point and the lower dead point of the piston;
the engine management system is in control connection with the throttle valve and is in communication connection with the vehicle control unit;
the vehicle control unit can control the engine management system to close the throttle valve according to a starting instruction of the hybrid electric vehicle, control the motor to operate to start the engine, and control the electromagnetic valve to open according to the rotating speed of the engine to extract air in the intake manifold.
Preferably, the volume of the vacuum tank is greater than the sum of the volume of the intake manifold and one-half displacement of the engine.
Preferably, the engine further comprises:
the air inlet pressure sensor is arranged at one end, close to a cylinder body, in the air inlet manifold and used for detecting air inlet pressure p in the air inlet manifold, and the air inlet pressure sensor is in communication connection with the engine management system.
Preferably, the engine further comprises:
and one end of the crankshaft is connected with the piston, the other end of the crankshaft is in driving connection with the motor, and the motor is used for driving the crankshaft to rotate so as to drive the piston to perform compression stroke between an upper dead point and a lower dead point.
Another objective of the present invention is to provide a control method for eliminating the start-up jitter, which can fundamentally solve the problem of the start-up jitter of the engine and is simple and convenient to control.
In order to achieve the purpose, the invention adopts the following technical scheme:
a control method for eliminating the start-up jitter is based on the hybrid electric vehicle and comprises the following steps:
s10: after the vehicle control unit sends a start-up instruction, the vehicle control unit controls the engine management system to close the throttle valve and feeds a closing completion signal back to the vehicle control unit;
s20: after the vehicle control unit receives the closing completion signal, the vehicle control unit controls the motor to operate to start the engine so as to drive the piston to perform a compression stroke between an upper dead point and a lower dead point;
s30: the vehicle control unit monitors the rotating speed of the engine in real time to control the electromagnetic valve to open the vacuum tank according to the rotating speed of the engine, so that the vacuum tank extracts air in the air inlet manifold;
s40: after the vacuum tank is opened, the vehicle control unit continuously monitors the rotating speed of the engine in real time so as to control the electromagnetic valve to close the vacuum tank according to the rotating speed of the engine, and therefore the excessive negative pressure in the intake manifold is avoided;
s50: the vehicle control unit continuously monitors the rotating speed of the engine in real time so as to enable the rotating speed n of the engine to reach a target rotating speed n0And when the whole vehicle controller controls the engine management system to open the throttle valve, and an oil injection instruction is sent to enable the engine to perform oil injection and ignition so as to finish the starting.
Preferably, in the step S30: when the vehicle control unit monitors that the rotating speed n of the engine is larger than 50rpm, the vehicle control unit controls the electromagnetic valve to open the vacuum tank so that the vacuum tank extracts air in the air inlet manifold;
in the step S40: after the vacuum tank is opened, when the vehicle control unit monitors that the rotating speed n of the engine is more than n0At 50rpm, the vehicle control unit controls the electromagnetic valve to close the vacuum tank.
Preferably, between the step S30 and the step S40: the electric machine requires an increased starting torque to match the increased negative pressure value in the intake manifold.
Preferably, the motor requires an increased starting torque T ═ 2 × S × (P)0-P), wherein S is the area of the piston, P0Is atmospheric pressure and p is the intake pressure within the intake manifold.
Preferably, the vehicle control unit is further configured to control the solenoid valve to open the vacuum tank according to the intake pressure p in the intake manifold during the engine shutdown process, so as to increase the vacuum degree in the vacuum tank by the negative pressure in the intake manifold.
Preferably, when the intake pressure p in the intake manifold is less than 290hPa, the vehicle control unit controls the electromagnetic valve to open the vacuum tank so as to increase the vacuum degree in the vacuum tank through the negative pressure in the intake manifold;
when p is larger than 300hPa, the whole vehicle controller controls the electromagnetic valve to close the vacuum tank.
The invention has the beneficial effects that:
the vacuum tank and the electromagnetic valve are arranged in the engine, so that the vehicle controller can control the engine management system to close the throttle valve according to the start command of the hybrid electric vehicle, control the motor to operate to start the engine, control the opening of the electromagnetic valve according to the rotating speed of the engine, and extract air in the air inlet manifold, so that the air in the air inlet manifold cannot be sucked into the cylinder body when the piston of the engine moves from the top dead center to the bottom dead center, namely, the problem that the air pressure in the cylinder body is very high when the piston moves from the bottom dead center to the top dead center, and the vehicle shakes when starting due to the high air pressure can be avoided, so that the whole driving comfort is good, the effect of shaking reduction is achieved, and the fundamental reason of starting shaking caused by residual air reserved in the air inlet manifold of the engine is solved, the problem of starting and shaking of the engine can be fundamentally solved; the opening and closing of the electromagnetic valve are controlled through the rotating speed of the engine, so that the problem that the starting shake cannot be solved due to the fact that air in the air inlet manifold is pumped away slightly can be avoided, the problem that the starting of the engine is influenced due to the fact that negative pressure in the air inlet manifold is too large can be avoided, and the using performance of the engine cannot be influenced under the condition that the starting shake is eliminated.
Drawings
FIG. 1 is a schematic view of a portion of a hybrid vehicle according to the present invention;
fig. 2 is a schematic flow chart of a control method for eliminating startup jitter according to the present invention.
In the figure:
1-a vehicle control unit; 21-vacuum tank; 22-a solenoid valve; 23-an engine management system; 24-an intake pressure sensor; 25-an intake manifold; 26-a throttle valve; 27-cylinder body; 271-an exhaust valve; 272-an intake valve; 28-a piston; 29-crankshaft.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features. Like reference numerals refer to like elements throughout the specification.
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
Example one
The embodiment provides a hybrid electric vehicle which can fundamentally solve the problem of starting and shaking of an engine so as to ensure that the driving comfort is better. Specifically, the hybrid electric vehicle comprises a motor, an engine and a vehicle control unit, wherein the vehicle control unit is in control connection with the motor, and the engine is started by the motor to drag the engine to run until the engine reaches the target rotating speed, so that the engine is subjected to oil injection and ignition, and the engine enters a circulating working state.
Specifically, as shown in fig. 1, the engine includes an intake manifold 25, a vacuum tank 21, a cylinder block 27, and an engine management system 23; one end of the intake manifold 25 is connected with a throttle valve 26; the vacuum tank 21 is connected with the intake manifold 25, the electromagnetic valve 22 is connected to the vacuum tank 21, the electromagnetic valve 22 is used for opening or closing the vacuum tank 21, and the electromagnetic valve 22 is in control connection with the vehicle control unit 1; a cylinder 27 connected to the other end of the intake manifold 25, a piston 28 disposed in the cylinder 27, the piston 28 being capable of a compression stroke between its top dead center and bottom dead center, and an exhaust valve 271 and an intake valve 272 connected to the intake manifold 25 being disposed at the top end of the cylinder 27; the engine management system 23 is in control connection with the throttle valve 26, and the engine management system 23 is in communication connection with the vehicle control unit 1. Wherein, when the piston 28 moves from top dead center to bottom dead center, the intake valve 272 is opened and the exhaust valve 271 is closed; when piston 28 moves from bottom dead center to top dead center, intake valve 272 closes and exhaust valve 271 closes.
The vehicle control unit 1 can control the engine management system 23 to close the throttle valve 26 and control the motor to operate to start the engine according to a start command of the hybrid electric vehicle, and the vehicle control unit 1 can also control the opening of the electromagnetic valve 22 according to the rotation speed of the engine to draw air in the intake manifold 25.
The vacuum tank 21 and the electromagnetic valve 22 are arranged in the engine, so that the vehicle controller 1 can control the engine management system 23 to close the throttle valve 26 according to a start command of the hybrid electric vehicle, control the motor to operate to start the engine, and control the opening of the electromagnetic valve 22 according to the rotating speed of the engine, so as to extract air in the intake manifold 25, so that the air in the intake manifold 25 cannot be sucked into the cylinder 27 when the piston 28 of the engine moves from the top dead center to the bottom dead center, namely, the problems that the air pressure in the cylinder 27 is large when the piston 28 moves from the bottom dead center to the top dead center, and the large air pressure can cause the vehicle to shake when starting can be avoided, so that the whole driving comfort is good, the effect of shaking reduction can be achieved, and the fundamental cause of the starting shaking caused by residual air reserved in the intake manifold 25 of the engine can be solved, so as to fundamentally solve the problem of starting and shaking of the engine.
The opening and closing of the electromagnetic valve 22 is controlled by the rotation speed of the engine, so that the problem that the engine starting jitter cannot be solved due to the fact that less air is pumped out from the air inlet manifold 25 can be avoided, the problem that the starting of the engine is influenced due to the fact that the negative pressure in the air inlet manifold 25 is too large can be avoided, and the using performance of the engine cannot be influenced under the condition that the engine starting jitter is eliminated.
Further, the volume of the vacuum tank 21 is greater than the sum of the volume of the intake manifold 25 and one-half of the displacement of the engine, so that the vacuum tank 21 can be ensured to meet the air extraction requirement in the intake manifold 25.
Specifically, as shown in fig. 1, the engine further includes an intake pressure sensor 24 and a crankshaft 29; the intake pressure sensor 24 is arranged at one end of the intake manifold 25 close to the intake valve 272, and is used for detecting the intake pressure p in the intake manifold 25, and the intake pressure sensor 24 is in communication connection with the engine management system 23, after the engine management system 23 receives the intake pressure p of the intake pressure sensor 24, the engine management system 23 can feed the intake pressure p back to the vehicle controller 1, so that the vehicle controller 1 can use the intake pressure p; one end of the crankshaft 29 is connected to the piston 28, and the other end of the crankshaft 29 is drivingly connected to a motor for driving the crankshaft 29 to rotate so as to drive the piston 28 to perform a compression stroke between the top dead center and the bottom dead center. The vehicle control unit 1 and the engine management system 23 in this embodiment are both common structures in automobiles in the prior art, and therefore, the working principle thereof will not be described in detail herein.
Example two
In the present embodiment, a control method for eliminating the start-up jitter based on the hybrid electric vehicle in the first embodiment is provided, and the control method is simple and convenient, and as shown in fig. 2, the control method for eliminating the start-up jitter includes the following steps:
s10: after the vehicle control unit 1 sends a start-up instruction, the vehicle control unit 1 controls the engine management system 23 to close the throttle valve 26, and feeds a closing completion signal back to the vehicle control unit 1;
s20: after the vehicle control unit 1 receives the closing completion signal, the vehicle control unit 1 controls the motor to operate to start the engine, so as to drive the piston 28 to perform a compression stroke between the top dead center and the bottom dead center, so that the engine can reach the target rotating speed n0；
S30: the vehicle control unit 1 monitors the rotating speed n of the engine in real time to control the electromagnetic valve 22 to open the vacuum tank 21 according to the rotating speed of the engine, so that the vacuum tank 21 extracts air in the air intake manifold 25;
s40: after the vacuum tank 21 is opened, the vehicle control unit 1 continuously monitors the rotating speed n of the engine in real time, so as to control the electromagnetic valve 22 to close the vacuum tank 21 according to the rotating speed of the engine, and avoid overlarge negative pressure in the intake manifold 25;
s50: the vehicle control unit 1 continuously monitors the rotating speed of the engine in real time so as to enable the rotating speed n of the engine to reach the target rotating speed n0In time, the vehicle control unit 1 controls the engine management system 23 to open the throttle valve 26 and send an oil injection instruction, so that the engine performs oil injection and ignition to complete the start-up operation, and the start-up of the engine is successful.
Wherein, in step S30: when the vehicle control unit 1 monitors that the rotating speed n of the engine is greater than 50rpm, the vehicle control unit 1 controls the electromagnetic valve 22 to open the vacuum tank 21, so that the vacuum tank 21 extracts air in the intake manifold 25 to reduce the air pressure in the intake manifold 25; and in step S40: after the vacuum tank 21 is opened, when the vehicle control unit 1 monitors that the rotating speed n of the engine is more than n0At 50rpm, the vehicle control unit 1 controls the electromagnetic valve 22 to close the vacuum tank 21, namely, the air in the intake manifold 25 is lessThe shaking phenomenon can not be generated to the starting of the engine.
Further, between step S30 and step S40: because the vacuum tank 21 always extracts air from the intake manifold 25, so that the negative pressure in the intake manifold 25 is relatively large, and a certain resistance exists when the engine is in an intake stroke during the starting process, the starting torque needs to be additionally increased by the motor at the moment so as to match the increased negative pressure value in the intake manifold 25, and the starting process of the engine is prevented from being influenced.
Among them, the motor requires an additional large starting torque T2 × S × (P)0P), where S is the area of the piston 28 and P0At atmospheric pressure, p is the intake pressure in the intake manifold 25.
Further, the vehicle control unit 1 can be further configured to control the electromagnetic valve 22 to open the vacuum tank 21 according to the intake pressure p in the intake manifold 25 during the engine shutdown process, so as to increase the vacuum degree in the vacuum tank 21 through the negative pressure in the intake manifold 25, so as to compensate that the negative pressure in the vacuum tank 21 is low due to the air in the intake manifold 25 being extracted during the startup process, so that the vacuum tank 21 can extract the air in the intake manifold 25 again at a proper vacuum degree when the engine is started next time.
The vacuum tank 21 is opened by controlling the electromagnetic valve 22 according to the air inlet pressure p in the air inlet manifold 25, so that the vacuum degree in the vacuum tank 21 is improved through the negative pressure in the air inlet manifold 25, the vacuum degree in the vacuum tank 21 is improved by directly utilizing the negative pressure in the air inlet manifold 25 under the condition that the vacuum degree in the vacuum tank 21 is not required to be adjusted by using additional equipment, the cost is saved, the energy efficiency is maximized, and the vacuum pump is convenient and simple to use.
Specifically, when the intake pressure p < 290hPa in the intake manifold 25, the hybrid controller 1 controls the electromagnetic valve 22 to open the vacuum tank 21, so as to increase the vacuum degree in the vacuum tank 21 by the negative pressure in the intake manifold 25; when p is greater than 300hPa, the vehicle control unit 1 controls the electromagnetic valve 22 to close the vacuum tank 21, so that the vacuum degree in the vacuum tank 21 is appropriate.
The specific control process of the control method for eliminating the startup jitter in the embodiment is as follows:
firstly, judging whether a start-up instruction is sent, and after the vehicle control unit 1 sends the start-up instruction, immediately controlling an engine management system 23 to close a throttle valve 26 by the vehicle control unit 1 and feeding a closing completion signal back to the vehicle control unit 1; after the vehicle control unit 1 receives the closing completion signal, the vehicle control unit 1 controls the motor to operate to start the engine, so that the piston 28 of the engine moves between the top dead center and the bottom dead center in the cylinder 27 to realize the compression stroke, thereby enabling the engine to reach the target rotation speed n thereof0；
Then, when the vehicle control unit 1 monitors that the rotating speed n of the engine is greater than 50rpm, the vehicle control unit 1 controls the electromagnetic valve 22 to open the vacuum tank 21, so that the vacuum tank 21 extracts air in the intake manifold 25 to reduce the air pressure in the intake manifold 25;
secondly, after the vacuum tank 21 is opened, the vehicle control unit 1 monitors that the rotating speed n of the engine is more than n0At 50rpm, the vehicle control unit 1 controls the electromagnetic valve 22 to close the vacuum tank 21, namely, the air in the intake manifold 25 is less, so that the starting of the engine cannot be shaken, and the excessive negative pressure in the intake manifold 25 is avoided;
finally, when the vehicle control unit 1 monitors that the rotating speed n of the engine is equal to n0In the process, the vehicle control unit 1 controls the engine management system 23 to open the throttle valve 26 and send an oil injection instruction so that the engine performs oil injection and ignition to complete the whole starting operation, and the problem of vehicle shaking is avoided in the starting process so that the driving and riding comfort is good.
After the vacuum tank 21 is opened and before the vacuum tank 21 is closed, the motor is required to additionally increase the starting torque to match the increased negative pressure value in the intake manifold 25, so that the starting process of the engine is prevented from being influenced; the motor requires an additional large starting torque T of 2 × S × (P)0-p)。
Wherein, in order to realize the efficiency maximize and improve the vacuum in vacuum tank 21 to use when the next engine is started, need vehicle control unit 1 in the engine shutdown in-process, control solenoid valve 22 according to the inlet pressure p in the intake manifold 25 and open vacuum tank 21, in order to improve the vacuum in vacuum tank 21 through the negative pressure in the intake manifold 25, specific process is as follows:
when the intake pressure p in the intake manifold 25 is less than 290hPa, the vehicle control unit 1 controls the electromagnetic valve 22 to open the vacuum tank 21 so as to increase the vacuum degree in the vacuum tank 21 through the negative pressure in the intake manifold 25;
when p is larger than 300hPa, the vehicle control unit 1 controls the electromagnetic valve 22 to close the vacuum tank 21.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (10)
1. A hybrid electric vehicle is characterized by comprising a motor, an engine and a vehicle control unit (1), wherein the engine is started by the motor to reach a target rotating speed so as to perform oil injection and ignition, the vehicle control unit (1) is in control connection with the motor, and the engine comprises:
an intake manifold (25) having a throttle valve (26) connected to one end thereof;
the vacuum tank (21) is connected with the intake manifold (25), an electromagnetic valve (22) is connected to the vacuum tank (21) and used for opening or closing the vacuum tank (21), and the electromagnetic valve (22) is in control connection with the vehicle control unit (1);
a cylinder (27) connected to the other end of the intake manifold (25), a piston (28) being provided in the cylinder (27), the piston (28) being capable of a compression stroke between its top dead center and bottom dead center;
an engine management system (23) in control connection with the throttle valve (26), wherein the engine management system (23) is in communication connection with the vehicle control unit (1);
the vehicle control unit (1) can control the engine management system (23) to close the throttle valve (26) according to a starting command of the hybrid electric vehicle, control the motor to operate to start the engine, and control the electromagnetic valve (22) to open according to the rotating speed of the engine to extract air in the air intake manifold (25).
2. The hybrid vehicle according to claim 1, characterized in that the volume of the vacuum tank (21) is greater than the sum of the volume of the intake manifold (25) and one-half displacement of the engine.
3. The hybrid vehicle according to claim 1, wherein the engine further comprises:
an intake pressure sensor (24) disposed within the intake manifold (25) at an end proximate to a cylinder block (27) for detecting an intake pressure p within the intake manifold (25), the intake pressure sensor (24) communicatively coupled to the engine management system (23).
4. The hybrid vehicle according to claim 1, wherein the engine further comprises:
and one end of the crankshaft (29) is connected with the piston (28), the other end of the crankshaft is in driving connection with the motor, and the motor is used for driving the crankshaft (29) to rotate so as to drive the piston (28) to perform a compression stroke between an upper dead point and a lower dead point.
5. A control method for eliminating the starting shake, which is based on the hybrid vehicle according to any one of claims 1 to 4, comprising the steps of:
s10: after the vehicle control unit (1) sends a start-up instruction, the vehicle control unit (1) controls the engine management system (23) to close the throttle valve (26), and feeds a closing completion signal back to the vehicle control unit (1);
s20: after the vehicle control unit (1) receives the closing completion signal, the vehicle control unit (1) controls the motor to operate to start the engine so as to drive the piston (28) to perform a compression stroke between an upper dead point and a lower dead point;
s30: the vehicle control unit (1) monitors the rotating speed of the engine in real time to control the electromagnetic valve (22) to open the vacuum tank (21) according to the rotating speed of the engine, so that the vacuum tank (21) extracts air in the air inlet manifold (25);
s40: after the vacuum tank (21) is opened, the vehicle control unit (1) continuously monitors the rotating speed of the engine in real time, so as to control the electromagnetic valve (22) to close the vacuum tank (21) according to the rotating speed of the engine, and avoid overlarge negative pressure in the intake manifold (25);
s50: the vehicle control unit (1) continuously monitors the rotating speed of the engine in real time so as to enable the rotating speed n of the engine to reach a target rotating speed n0And when the whole vehicle controller (1) controls the engine management system (23) to open the throttle valve (26), and an oil injection instruction is sent, so that the engine performs oil injection and ignition to finish the starting.
6. The startup shake elimination control method according to claim 5, wherein in step S30: when the vehicle control unit (1) monitors that the rotating speed n of the engine is larger than 50rpm, the vehicle control unit (1) controls the electromagnetic valve (22) to open the vacuum tank (21) so that the vacuum tank (21) can extract air in the air inlet manifold (25);
in the step S40: after the vacuum tank (21) is opened, when the vehicle control unit (1) monitors that the rotating speed n of the engine is more than n0-50rpm, the vehicle control unit (1) controlling the solenoid valve (22) to close the vacuum tank (21).
7. The control method for eliminating the startup jitter of claim 5, wherein between the step S30 and the step S40: the electric machine requires an increased starting torque to match the increased negative pressure value in the intake manifold (25).
8. The control method for eliminating the start-up jitter of claim 7, wherein said motor requires an increased starting torque T of 2 × S × (P)0-P), wherein S is the area of the piston (28), P0Is atmospheric pressure, and p is the intake pressure in the intake manifold (25)Force.
9. The control method for eliminating the startup shake according to claim 5, characterized in that the vehicle control unit (1) is further operable to control the solenoid valve (22) to open the vacuum tank (21) in accordance with the intake pressure p in the intake manifold (25) during the engine stop to increase the vacuum degree in the vacuum tank (21) by the negative pressure in the intake manifold (25).
10. The startup shake elimination control method according to claim 9, characterized in that the vehicle control unit (1) controls the solenoid valve (22) to open the vacuum tank (21) to increase the vacuum degree in the vacuum tank (21) by the negative pressure in the intake manifold (25) when the intake pressure p < 290hPa in the intake manifold (25);
when p is larger than 300hPa, the vehicle control unit (1) controls the electromagnetic valve (22) to close the vacuum tank (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110817165.8A CN113389645B (en) | 2021-07-20 | 2021-07-20 | Hybrid electric vehicle and control method for eliminating start-up jitter |
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Cited By (7)
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| CN113982804A (en) * | 2021-11-15 | 2022-01-28 | 中国第一汽车股份有限公司 | Start-up system and control method |
| CN113982805A (en) * | 2021-11-15 | 2022-01-28 | 中国第一汽车股份有限公司 | Start-up system and control method |
| CN114352423A (en) * | 2022-01-14 | 2022-04-15 | 中国第一汽车股份有限公司 | Engine starting noise control method, device, equipment and storage medium |
| CN114922761A (en) * | 2022-05-27 | 2022-08-19 | 中国第一汽车股份有限公司 | Control method of start-up auxiliary system and start-up auxiliary system |
| CN115324754A (en) * | 2022-08-17 | 2022-11-11 | 义乌吉利动力总成有限公司 | Control method and device |
| CN115506905A (en) * | 2022-09-22 | 2022-12-23 | 中国第一汽车股份有限公司 | Hybrid vehicle, engine starting assisting method, system, device and medium |
| CN115324754B (en) * | 2022-08-17 | 2024-05-14 | 义乌吉利动力总成有限公司 | Control method and device for engine throttle valve |
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| CN113982804A (en) * | 2021-11-15 | 2022-01-28 | 中国第一汽车股份有限公司 | Start-up system and control method |
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| WO2023082848A1 (en) * | 2021-11-15 | 2023-05-19 | 中国第一汽车股份有限公司 | Starting system and control method |
| WO2023082845A1 (en) * | 2021-11-15 | 2023-05-19 | 中国第一汽车股份有限公司 | Starting system and control method |
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| CN115324754B (en) * | 2022-08-17 | 2024-05-14 | 义乌吉利动力总成有限公司 | Control method and device for engine throttle valve |
| CN115506905A (en) * | 2022-09-22 | 2022-12-23 | 中国第一汽车股份有限公司 | Hybrid vehicle, engine starting assisting method, system, device and medium |
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