Hybrid electric vehicle and control method for eliminating starting jitter
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A technology of a hybrid electric vehicle and a control method, which is applied in the directions of engine control, starting of the engine, and starting of the motor for the engine, etc., can solve the problems of vehicle shaking, affecting the driving comfort, and high air pressure.
Active Publication Date: 2021-09-14
CHINA FIRST AUTOMOBILE
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Problems solved by technology
[0003] Since there is residual air in the intake manifold of the engine, when the piston of the engine moves from the top dead center to the bottom dead center, the air in the intake manifold will be sucked into the cylinder, causing the piston to move from the bottom dead center When reaching the top dead center, the air pressure in the cylinder is very high, and the large air pressure will cause the vehicle to vibrate when starting, which will affect the driving comfort
[0004] In order to solve the above problems, at present, when the engine of a hybrid vehicle is started, the drive motor is blocked, so that the vibration of the engine cannot be amplified by the mechanical structure such as the gearbox, although it can reduce the vehicle vibration caused by the engine when starting. , to improve the driving comfort of the vehicle; but it only slows down the vibration on the transmission chain of the hybrid vehicle, that is, it can only slow down the transmission of the vibration, and does not fundamentally solve the problem of the engine starting vibration
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Embodiment 1
[0044] In this embodiment, a hybrid electric vehicle is proposed, which can fundamentally solve the problem of engine start-up vibration, so that the driving comfort is better. Specifically, a hybrid electric vehicle includes a motor, an engine and a vehicle controller, the vehicle controller is connected with the motor control, and the engine is started by the motor to drag the engine to run until reaching its target speed, so that the engine can be injected and ignited. So that the engine enters the working state of cycle.
[0045] Specifically, such as figure 1Shown, engine comprises intake manifold 25, vacuum tank 21, cylinder block 27 and engine management system 23; Wherein, one end of intake manifold 25 is connected with throttle valve 26; Vacuum tank 21 is connected with intake manifold 25, And the vacuum tank 21 is connected with a solenoid valve 22, the solenoid valve 22 is used to open or close the vacuum tank 21, the solenoid valve 22 is connected with the control...
Embodiment 2
[0052] In this embodiment, a control method based on the elimination of starting vibration of a hybrid vehicle as in Embodiment 1 is proposed, and its control is simple and convenient, such as figure 2 As shown, the control method to eliminate the start-up vibration includes the following steps:
[0053] S10: After the vehicle controller 1 issues a starting command, the vehicle controller 1 controls the engine management system 23 to close the throttle valve 26, and feeds back a closing completion signal to the vehicle controller 1;
[0054] S20: After the vehicle controller 1 receives the shutdown completion signal, the vehicle controller 1 controls the motor to run to start the engine, thereby driving the piston 28 to compress the stroke between the top dead center and the bottom dead center, so that the engine can reach its target Speed n 0 ;
[0055] S30: The vehicle controller 1 monitors the engine speed n in real time, so as to control the solenoid valve 22 to open ...
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Abstract
The invention discloses a hybrid electric vehicle and a control method for eliminating starting jitter, and belongs to the technical field of hybrid electric vehicles. The hybrid electric vehicle comprises a motor, an engine and a whole vehicle controller, wherein the engine is started by the motor to reach a target rotating speed so as to carry out oil injection ignition, the vehicle control unit is in control connection with the motor, and the engine comprises an air inlet manifold, one end of which is connected with a throttle valve; a vacuum tank which is connected with the air inlet manifold, wherein 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 whole vehicle controller; a cylinder body which is connected to the other end of the air inlet manifold, wherein a piston is arranged in the cylinder body, and the piston can perform compression stroke between an upper dead center and a lower dead center of the piston; and an engine management system which is in control connection with the throttle valve, wherein the engine management system is in communication connection with the whole vehicle controller. The hybrid electric vehicle has the beneficial effect that the problem of jitter when the engine is started can be fundamentally solved.
Description
technical field [0001] The invention relates to the technical field of hybrid electric vehicles, in particular to a hybrid electric vehicle and a control method for eliminating starting vibration. Background technique [0002] Hybrid electric vehicles are widely developed due to their excellent performance. Among them, in a hybrid vehicle, usually after the motor drags the engine to its target speed, the engine performs fuel injection and ignition, thereby entering a cycle work mode; and the target speed of the engine is compared with the fuel injection speed of the traditional car High, in order to speed up the engine to its target speed, the engine needs to go through several compression strokes before the fuel injection ignites. [0003] Since there is residual air in the intake manifold of the engine, when the piston of the engine moves from the top dead center to the bottom dead center, the air in the intake manifold will be sucked into the cylinder, causing the piston...
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