Pure electric vehicle crawling at start and anti-slope strategy

Abstract

The invention discloses a starting crawling and anti-running strategy for a pure electric vehicle. The starting crawling and anti-running strategy for the pure electric vehicle comprises the steps of enabling a motor controller to make judgment according to conditions after receiving starting crawling enabling transmitted by a vehicle controller; if all conditions of the judgment are met, enabling the motor controller to control the vehicle to enter in starting crawling; in an initial stage of starting crawling, enabling a motor to operate according to a constant torque and then increasing rotation speed of the motor to a set rotation speed inflection point by using a given torque step; carrying out smooth reducing processing on the torque of the motor at the moment till the rotation speed of the motor reaches a set maximum crawling rotation speed; when the vehicle enters in uphill parking, exiting the crawling mode and entering in an anti-running mode; enabling the motor to operate under the control of a speed ring so that the motor is kept at a zero rotation speed to achieve an anti-running purpose of the vehicle; and enabling the motor controller to make judgment according to the conditions; and if any condition is met, exiting the starting crawling. The starting crawling and anti-running strategy for the pure electric vehicle has the advantages that the vehicle starting crawling function and the anti-running function are seamlessly integrated, defects of the vehicle of forward-rush, shaking and abnormal sounds are overcome and the vehicle driving safety and comfort are effectively improved.

Description

technical field [0001] The invention relates to a creeping and slope prevention strategy for a pure electric vehicle. Background technique [0002] With the development of science and technology, new energy vehicles, especially pure electric vehicles, are developing rapidly, but the technical requirements for pure electric vehicles are getting higher and higher, and vehicle functions are becoming more and more perfect. Due to the large difference in motor torque required by the two functions, the creeping function requires a small motor output torque, while the slope prevention function requires a large motor output torque, so there will be problems in the implementation process. Many problems such as forward rush, jitter, and abnormal noise seriously affect the safety and comfort of vehicle driving. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a pure electric vehicle start crawling and anti-slope strategy. T...

AI Technical Summary

Problems solved by technology

[0002] With the development of science and technology, new energy vehicles, especially pure electric vehicles, are developing rapidly, but the technical requirements for pure electric vehicles are getting higher and higher, and vehicle functions are becoming more and more perfect. Due to the large difference in motor torque required by the two functions, the creeping function requires a small motor output torque, while the slope prevention function requires a large motor output torque, so there will be problems in the implementation process. Many problems such as forward rush, jitter, abnormal noise, etc., seriously affect the safety and comfort of driving

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