Energy dynamic control system and method of compound power supply EPS

Abstract

The invention provides an energy dynamic control system and method of compound power supply EPS. Firstly, the real-time working current of vehicle electric appliances (except for a steering motor anda super-capacitor) is acquired, the target current of the steering motor is calculated through the current steering wheel torque and the vehicle speed, and the charging and discharging state of the super-capacitor is judged through the difference value between the rated current of an electric generator and the sum of the real-time working current and the target current. When the super-capacitor ischarged, charging current is dynamically adjusted, so that the electric generator is in the optimal working interval, and the largest charging current of the super-capacitor is limited on the basis of the current SOC of the super-capacitor; and when the super-capacitor is discharged, discharging current is dynamically adjusted, so that the electric generator is in the optimal working interval, and the largest discharging current of the super-capacitor is limited on the basis of the current SOC of the super-capacitor. Through a super-capacitor charging and discharging control strategy designedon the basis of the method, on the premise that an EPS use function is met, the electric generator can be in or close to the optimal working interval as much as possible under any working condition,so that the energy conversion efficiency is improved, and energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of automobile steering, in particular to an energy dynamic control system and method for a composite power supply EPS of a commercial vehicle. Background technique [0002] In recent years, Electric Power Steering (EPS) has been widely used in passenger cars and light commercial vehicles due to its advantages of safety, energy saving and environmental protection. EPS provides steering assist through the motor, and the magnitude of the assist is controlled by the software program, which can easily realize the characteristic of variable assist with speed, which helps to improve the handling stability of the vehicle. Energy consumption. Due to the above-mentioned advantages, the electrification of the steering system, that is, electric power steering (EPS) will be the direction of the development of the steering system. [0003] EPS has been successfully applied to light commercial vehicles. However, heavy co...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of unbalanced power steering and energy waste due to unreasonable energy regulation of the vehicle power supply and supercapacitor, the present invention provides an energy dynamic control system and method for composite power supply EPS. The power steering system, starting from energy balance and improving energy conversion efficiency, has improved the control strategy and method. Through the dynamic control of the current, it can achieve the purpose of high efficiency and energy saving. The application provides a reasonable and effective solution

Images