Vehicle distance control method and device for electric vehicle and electric vehicle

Abstract

The invention discloses a vehicle distance control method and device for an electric vehicle and an electric vehicle. The method comprises the following steps of obtaining a distance between the electric vehicle and a preceding vehicle or a barrier; obtaining relative vehicle speed and relative acceleration between the electric vehicle and the preceding vehicle or the barrier according to the distance between the electric vehicle and the preceding vehicle or the barrier; calculating a collision avoidance time according to the distance and relative vehicle speed between the electric vehicle and the preceding vehicle or the barrier; judging a safety state grade of the electric vehicle according to the collision avoidance time and the relative acceleration; and controlling the electric vehicle according to the safety state grade so as to realize an active vehicle distance control function. The vehicle distance control method disclosed by the embodiment of the invention can intelligently and actively control the vehicle distance without being additionally provided with a control system and an executing mechanism so that the driving safety is ensured and user experience is greatly improved.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a vehicle distance control method and device for electric vehicles and the electric vehicle. Background technique [0002] In today's era, automobiles are developing very rapidly, and the number of automobiles in various countries is increasing. Driving safety is getting more and more attention. Especially in my country, automobiles have grown rapidly in recent years. At the same time, a series of measures such as subsidies for pure electric vehicles and unlimited electric vehicles in Beijing have greatly enhanced the enthusiasm of electric vehicle users to purchase electric vehicles and the enthusiasm of car companies for research and development of electric vehicles. Among them, the research on the driving safety of electric vehicles has become an important and urgent issue. [0003] The high-voltage power-off protection system before a collision of an electric vehi...

AI Technical Summary

Problems solved by technology

[0003] The high-voltage power-off protection system before a collision of an electric vehicle in the related art proposes protective measures to be adopted when the collision is inevitable, mainly including measures such as cutting off the torque output or disconnecting the high-voltage relay, which is a passive safety technology; in addition, the related technology The vehicle safety distance control system detects the distance between the vehicle and the vehicle in front through ultrasonic waves, and uses the distance detection parameters to control the main metering hole of the carburetor without injecting fuel to limit the speed, but it cannot actively implement braking

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