Control system and method for improving abnormal automobile start flutter noise based on driving force
A technology for starting and control systems of automobiles, applied in the direction of braking safety systems, etc., can solve problems affecting the vibration and noise performance of the braking system, stick-slip vibration at the position of the brake friction pair, and affecting the comfort of vehicle vibration and noise, etc., achieving low cost, Reduce chatter phenomenon, simple structure effect
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Embodiment 1
[0030] Below in conjunction with specific embodiment, further elaborate the working process and action mechanism of the present invention. It should be understood that this embodiment is only used to illustrate the present invention but not to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application. The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.
[0031] When the driver drives a car with automatic transmission at a standstill and gradually releases the brake pedal to start the car slowly, the driving torque output by the power transmission system and the braking torque output by the braking system will act on the vehi...
Embodiment 2
[0044] In step 4), it is judged whether the wheel speed signal of the wheel speed sensor reaches the limit value V0 or whether the braking force demand is lower than P3, V0 is 40% of the wheel speed when the vehicle is idling on flat ground, and the value range of P3 is the value of P2 1 / 20, if so, then the vehicle finishes starting, and the engine idle speed is restored to a normal value, if not, then returns to step 4), and the rest of the steps in this embodiment are the same as in embodiment 1.
[0045] figure 2 is the effect diagram of the control implementation of the method of the present invention, when the brake pressure is greater than the limit value P 1 , and the wheel speed is 0, it is judged that the vehicle is stationary, put in neutral and reduce the engine idle speed, when the brake pressure is less than the limit value P 2 , and there is still a downward trend, it is determined that the car is about to start, the gearbox is in the drive gear, and when the w...
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