Road grade and curvature based four-wheel-drive electric car speed optimization control method

Abstract

The invention discloses a four-wheel-drive electric car speed optimization control method. The method considers road grade and curvature information in a travelling path range overall, can minimize energy consumption of the car in a travelling process in a given path on the premise of ensuring the safety of the car. The method includes the following steps: acquiring road grade and curvature information through information systems such as a GPS ( Global Positioning System) and a GIS ( Geographic Information System); considering the road grade information and the car state, establishing a longitudinal dynamics prediction model, and establishing an energy consumption target function; considering the road curvature information, designing a constraint condition of the safety, and describing a model prediction control problem; and using the dynamic programming algorithm to solve the model prediction control problem, and acquiring a car speed optimization track. The four-wheel-drive electric car speed optimization control method can acquire the optimized target electric car speed and torque according to road working condition information, can be used for dynamics control of four-wheel-drive electric cars, and can improve the travelling economic and safe performance.

Description

technical field [0001] The invention relates to the field of vehicle speed optimization control, in particular to a speed optimization control method of a four-wheel drive electric vehicle considering road slope and curvature information. Background technique [0002] Since environmental and energy issues have been concerned, the economy of automobiles has always been a research focus at home and abroad. The economy of a car is not only related to the performance of the vehicle itself, but also affected by the driving road and working conditions. Therefore, in recent years, some scholars have studied predictive cruise control considering road slope information. For heavy-duty trucks on roads with large slope changes and frequent road sections, the economical improvement effect is very obvious. Daimler Chrysler is based on the traditional adaptive cruise system, according to GPS navigation, combined with 3D digital maps, obtains the information of the slope of the road ahead...

AI Technical Summary

Problems solved by technology

At present, the speed optimization control and predictive cruise control for road information at home and abroad mainly consider the slope information of the road, and less consideration is given to the curvature information of the road, especially for four-wheel drive electric vehicles.

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