Slope starting auxiliary control method and device of electric automobile and electric automobile

By performing torque distribution and PID control of the electric drive axle in electric vehicles, a low-cost slope assist function is realized, and the problem of relying on high-cost electronic braking systems in the prior art is solved, ensuring that the vehicle is stable on the ramp.

CN119659356APending Publication Date: 2025-03-21ZHEJIANG GEELY HLDG GRP CO LTD +2
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Patent Information

Application Number
CN202411941305.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-26
Publication Date
2025-03-21

AI Technical Summary

Technical Problem

The slope assist function of existing electric vehicles is usually achieved by relying on high-cost electronic braking systems (EBS).

Method used

By receiving the initial standing slope torque, the first and second electric drive axles of the electric vehicle are distributed, and the corresponding torque is controlled to output, and the input current and voltage are adjusted through the PID control method according to the current vehicle speed and motor characteristic curve to keep the vehicle stable on the ramp.

Benefits of technology

It realizes the slope assist function in electric vehicles at a low cost, avoids the high-cost electronic braking system, and can respond to the vehicle's torque needs in real time, preventing the vehicle from rushing forward or slipping slopes.

✦ Generated by Eureka AI based on patent content.
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Abstract

The invention provides a slope starting auxiliary control method and device of an electric vehicle and the electric vehicle. The electric vehicle comprises a first electric drive axle and a second electric drive axle. The slope starting auxiliary control method comprises the steps that an initial slope holding torque is received; according to the initial hill-holding torque, torque distribution is conducted on the first electric drive bridge and the second electric drive bridge, the first electric drive bridge is controlled to output first torque, and the second electric drive bridge is controlled to output second torque; the sum of the first torque and the second torque is the initial hill-holding torque; after torque distribution, the current vehicle speed of the electric vehicle is obtained; if the current vehicle speed is zero, the first electric drive axle and the second electric drive axle are controlled to keep the current output torque; and if the current vehicle speed is not zero, the first electric drive axle is controlled to keep the current output torque, and the second electric drive axle is controlled to output the corresponding torque when the rotating speed of the second electric drive axle is zero, so that the electric vehicle is kept in a slope parking state. The slope starting assisting function can be achieved at low cost.
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