A vehicle creep control method and system

Abstract

The invention discloses an automobile crawling control method and system. By acquiring the magnitude of the braking demand torque, when the braking demand torque reaches the first threshold value, the crawling torque is adjusted to be zero, so that an electric vehicle stops running, otherwise, the first crawling torque value corresponding to the braking torque range of the braking demand torque is looked up according to a preset torque threshold value table, and the crawling torque is adjusted to be the first crawling torque value. According to the scheme, by presetting braking torque ranges for the braking demand torque, each braking torque range corresponds to a crawling torque value, thus, when the acquired braking demand torque is within one of the ranges, the crawling torque is adjusted to be the crawling torque value corresponding to the range, the automobile crawling speed can be adjusted conveniently, and adjusting of the crawling torque is smooth; and meanwhile, the emergency stopping situation is avoided, and the passenger sitting experience is improved.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to an automobile creep control method and system. Background technique [0002] Electric vehicles generally do not have a clutch, and the driver cannot control the electric vehicle through the clutch to maintain a lower speed. Shifting into forward gear or reverse gear, without other operations, can make the electric vehicle run at a lower speed. [0003] However, in the current urban traffic roads, even at creeping speed, the speed is relatively high when there are traffic jams or many vehicles, which is likely to cause traffic accidents. [0004] In this case, the driver typically controls the creep speed by maintaining a forward gear while at the same time applying the brakes. However, since the creeping speed itself is relatively low, if the vehicle is to be kept moving forward at a lower speed than the creeping speed, the requirements for the driver are relatively high, and it is e...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a vehicle creep control method and system to solve the problem in the prior art that when the vehicle is kept moving at a speed lower than the creep speed, the requirements for the driver are relatively high, and it is easy to cause an emergency stop. The situation makes the ride comfort of the vehicle poor and reduces the passenger experience. The specific plan is as follows:

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