The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 04, 2012
Filed:
Dec. 26, 2007
Xiaohua Tang, Guangdong, CN;
Xuguang Zhou, Guangdong, CN;
Yingwu Xu, Shanghai, CN;
Jian Gong, Shanghai, CN;
Nan Liu, Guangdong, CN;
Guangming Yang, Guangdong, CN;
Xiaohua Tang, Guangdong, CN;
Xuguang Zhou, Guangdong, CN;
Yingwu Xu, Shanghai, CN;
Jian Gong, Shanghai, CN;
Nan Liu, Guangdong, CN;
Guangming Yang, Guangdong, CN;
BYD Co. Ltd., , CN;
Abstract
A method and an apparatus for controlling output torque of a motor for an electric vehicle in downhill mode comprises following steps: detecting a tilt angle value θ, a current vehicle speed value V and an accelerator-pedal travel value Gain of the vehicle, determining whether the vehicle is in downhill mode or not, and if the result is positive, then calculating a downhill slip torque Tof the vehicle under the tilt angle value θ, obtaining a maximum output torque T, calculating an output torque T of the motor based on T, T, Gain and a given vehicle speed delimitative value V, and controlling the motor to output the calculated output torque T. The present invention ensures the vehicle speed not too high by controlling the output torque of an electric vehicle in downhill mode, even if the brake-pedal travel is zero.