Vehicle speed measuring method and device based on electric vehicle

Abstract

The invention provides a vehicle speed measuring method and device based on an electric vehicle. The vehicle speed measuring method based on the electric vehicle comprises the steps that when a motor controller of the electric vehicle cannot obtain vehicle speed information from an antilock brake system (ABS) of the electric vehicle, according to the motor rotary speed of the electric vehicle, the vehicle speed estimated value is calculated and obtained, according to the accelerated speed of the electric vehicle, the accuracy of the vehicle speed estimated value is verified, and if verification of the vehicle speed estimated value is passed, according to the vehicle speed estimated value, the vehicle speed of the electric vehicle is determined. Compared with the prior art, when the ABS breaks down, the vehicle speed information cannot be obtained, and the vehicle speed calculated and obtained through the motor rotary speed can cause the calculated and obtained vehicle speed to be inaccurate due to skidding or locking of the vehicle so that the situation that whether safety exists or not is judged by a driver according to the accurate vehicle speed information cannot achieved, and the potential safety hazard of driving operation exists; and according to the vehicle speed measuring method, the technical problem that in the prior art, safety is low is solved.

Description

technical field [0001] The present invention relates to the technical field of vehicle control, and in particular, to a method and device for measuring vehicle speed based on an electric vehicle. Background technique [0002] In the face of increasingly severe energy and environmental problems, energy-saving and new energy vehicles are becoming the focus of current research in various countries. The development of energy-saving and new energy vehicles, especially pure electric vehicles with zero pollution and zero emissions, is not only of great significance to my country's energy security and environmental protection, but also an important direction for my country's automotive industry to achieve transformation, upgrading and technological breakthroughs. future development trends. [0003] As with traditional fuel vehicles, reliable and effective access to current vehicle speed information is the basic premise to ensure drivers drive safely. Generally speaking, pure electri...

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Problems solved by technology

[0005] For this reason, the first purpose of the present invention is to propose a vehicle speed measurement method based on electric vehicles. Compared with the prior art, when the ABS system fails, the vehicle speed information cannot be obtained, and the vehicle speed calculated by the motor speed The calculated vehicle speed will be inaccurate due to vehicle skidding or locking, causing the driver to be unable to make a safe judgment based on accurate vehicle speed information, and there are potential safety hazards in driving operations. low technical issues

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