Method and device for controlling hill start of vehicle to prevent slip

Abstract

The invention discloses a method and device for controlling the hill start of a vehicle to prevent slip. The method includes the steps that whether the vehicle is in a hill start state or not is detected; the vehicle is continuously locked, the current ramp slope is collected to determine the gradient resistance, and the accelerator depth is collected to determine the driver demand wheel end torque; whether the driver demand wheel end torque is larger than or equal to the gradient resistance or not is judged; if yes, the vehicle is unlocked, and the motor target torque corresponding to the gradient resistance is output to prevent the vehicle from slipping. By means of the method and device, in the hill start, the vehicle is locked first and prevented from slipping backwards; if the driverdemand wheel end torque generated when a driver steps on an accelerator pedal is larger than or equal to the gradient resistance, the vehicle is unlocked only after it is ensured that power output bya vehicle motor can prevent the vehicle from slipping in uphill running, the motor target torque corresponding to the gradient resistance is output to prevent the vehicle from slipping, and thus the problem of hill start slip is thoroughly solved.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a method and device for controlling a vehicle to start on a slope and prevent a slope from slipping. Background technique [0002] With the development of social technology and economy, vehicles are becoming more and more important in daily life, and have become an important means of transportation in family life. Users have higher and higher requirements for the convenience and comfort of vehicle operation. When the vehicle starts to operate on a slope, the driver needs to step on the accelerator immediately after releasing the brake, otherwise the vehicle will slip backwards. This not only affects the comfort of the vehicle, but may even cause a safety accident. When operating, the driver's operation requirements are high, which affects the convenience of vehicle operation. [0003] In the current technology, traditional fuel vehicles mainly solve this problem by speedin...

AI Technical Summary

Problems solved by technology

This not only affects the comfort of the vehicle, but may even cause safety accidents

High operating requirements for the driver during operation, affecting the convenience of vehicle operation

[0003] In the current technology, traditional fuel vehicles mainly solve this problem by speeding up the coupling speed of the clutch and quickly outputting power, but at most it can only slow down the degree of vehicle slippage, which cannot be completely solved, and the coupling of the clutch too fast will also cause the vehicle to shake, resulting in new question

When pure electric vehicles solve this problem, they mainly deal with it by accelerating the output torque loading rate of the motor. The torque response of the motor is fast. Do a better job of slowing down the back slip, but cannot completely solve the problem of slipping

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