Electric vehicle torque optimization method based on data driven predictive control

Abstract

The invention provides an electric vehicle torque optimization method based on data driven predictive control, belongs to the technical field of electric vehicles, and aims to effectively perform optimized distribution of driving and braking torque of an electric vehicle so as to realize a tracking control method for the longitudinal velocity of the vehicle. The method comprises the steps as follows: firstly, appropriate excitation data are designed according to dynamic characteristics of a system, so that sufficient excitation for the system is guaranteed; secondly, a predictive output equation of the system is constructed by input / output data obtained by excitation; then actuator rigid constraints of a motor, a battery pack and a brake are considered, and a cost function for torque optimization control is constructed with a model predictive control algorithm; finally, an optimization problem corresponding to the cost function is solved to obtain control input which then acts on the system, so that the system is controlled. For the control algorithm, all that is required is off-line simulation experiments when the excitation data are acquired, so that the development cost is lower.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles. Background technique [0002] With the increasing environmental pollution and energy crisis, pure electric vehicles have become a major direction for the development of the automotive industry due to their advantages such as high energy efficiency, low emissions, low noise, and energy recovery. The country has also issued a large number of preferential policies to support enterprise research. Electric vehicles, during the "Tenth Five-Year Plan" period, the National 863 Program "Major Science and Technology Projects for Electric Vehicles" received strong support from the state for two consecutive phases. After the efforts of many companies, colleges and research institutes, my country's research on pure electric vehicles has There have been many technological innovations and breakthroughs in the research and development of core components and the design of vehicle systems. Whether it is a...

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Problems solved by technology

[0003] 1. Since the research object is a centralized pure electric vehicle, which has only one motor and is driven by the front wheels, there is no distribution optimization problem, and the torque distribution optimization design cannot be carried out like the four-wheel hub motor driven electric vehicle. Consider the generation of driving / braking torque in the vehicle controller

[0004] 2. The mechanism model of electric vehicle torque optimization control system is complex, nonlinear and difficult to model

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