AVH hill-holding hydraulic control method and vehicle
A control method and hydraulic technology, which is applied to vehicle components, brakes, brake transmissions, etc., can solve the problems of large brake pipeline hydraulic pressure and inaccurate calculation of brake hydraulic pressure, and achieve the effect of avoiding excessive pressure
Active Publication Date: 2022-05-13
DONGFENG MOTOR GRP
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Problems solved by technology
[0005] Aiming at the problems existing in the prior art, the present invention provides an AVH slope-holding hydraulic pressure control method and a vehicle to solve the problem of calculating the braking hydraulic pressure required for vehicle slope-holding Accuracy and the problem that the hydraulic pressure of the brake pipeline when standing on a slope is much greater than the hydraulic pressure of the brake pipeline required for standing on a slope
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[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0026] The present invention integrates the influence of slope signal α, road surface adhesion coefficient μ, vehicle load m, and the high temperature generated by the friction between the brake disc and the friction plate on the braking force on the slope, and calculates the reasonable brake pipeline hydraulic pressure P required for the slope. 坡需 ; When the vehicle is driving on a slope, the d...
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The invention discloses an AVH hill-holding hydraulic control method and a vehicle. The method comprises the following steps that S1, brake energy loss is calculated according to temperature rise generated by friction between a brake disc and a friction plate; s2, outputting the braking force loss Floss in real time according to the calibration relation between the braking energy loss and the braking force loss; s3, according to the braking force loss, the braking pipeline hydraulic pressure P slope requirement needed by slope parking is calculated; and S4, the hydraulic pressure P pipeline of the brake pipeline is adjusted according to the hydraulic pressure P slope requirement of the brake pipeline required by slope holding, so that the hydraulic pressure P pipeline is equal to the hydraulic pressure P slope requirement, and then the pressure maintaining stage is started. According to the method, the slope signal alpha, the road adhesion coefficient mu, the vehicle load m and the influence of the high temperature generated by friction between the brake disc and the friction plate on the slope parking braking force are synthesized, the reasonable hydraulic pressure P slope requirement of the brake pipeline required by slope parking is calculated, and the current hydraulic pressure of the brake pipeline is adjusted; and the service life of the high-pressure valve body is prevented from being shortened due to overhigh pressure of a brake pipeline while the vehicle is prevented from sliding on a slope.
Description
technical field [0001] The invention relates to the field of automatic parking maintenance, in particular to an AVH parking slope hydraulic control method and a vehicle. Background technique [0002] The Automatic Vehicle Hold (AVH) function is a sub-function of the Electronic Stability Control (ESC). When the vehicle is driving on a slope, the driver depresses the brake pedal to stop the vehicle. Then when the brake pedal is released, the AVH function will retain a certain amount of brake hydraulic pressure, so that the driver can release the pedal while keeping the vehicle stationary. After the temporary parking exceeds a certain time limit, the electronic parking brake (Electrical Park Brake, EPB) The function is turned on and the vehicle enters the parking state. [0003] There are two situations when the vehicle is parked on a slope through the AVH function: (1) When the brake hydraulic pressure generated by the driver on the brake pedal is greater than or equal to the...
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IPC IPC(8): B60T13/66
CPCB60T13/66
Inventor 徐楠楠江勋万正宇周传巨
Owner DONGFENG MOTOR GRP