Heat management method and system for electric power steering system

Abstract

The invention provides a heat management method and system for an electric power steering system. The method comprises the following steps: estimating the initial winding temperature of a motor according to the MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) temperature acquired by an acquisition module; acquiring the current of the motor by the acquisition module; searching for a quick heating table, a slow heating table and a heating blending factor table through a search module according to the current of the motor and the heating or heat dissipation speed of the specified motor, and acquiring a quick heating temperature rise calculation factor, a slow heating temperature rise calculation factor and a heating blending factor; and estimating the winding temperature rise value of the motor through a control module, calculating the current winding temperature of the motor, normalizing the ECU (Electronic Control Unit) temperature and the current winding temperature, and setting thermal protection, wherein the quick heating table, the slow heating table and the heating blending factor table are calibrated by a calibration module and are stored in a storage module. According to the method and system provided by the invention, the temperature rise and the current temperature are estimated through the table searching method, and the thermal protection is adopted through the normalization method, thereby effectively preventing the overheating damage of an ECU.

Description

technical field [0001] The present invention relates to a thermal management method and system, in particular to a thermal management method and system suitable for electric power steering systems. Background technique [0002] The electric power steering system EPS (Electric Power Steering) is a power steering system that directly relies on the motor to provide auxiliary torque. It provides steering assistance through the motor, eliminating the need for power steering oil pumps, hoses, hydraulic oil, Conveyor belts and engine-mounted pulleys save energy and protect the environment. In addition, it is characterized by simple adjustment, flexible assembly and power steering in various situations. Because of these advantages, electric power steering system EPS has become the development direction of automobile steering system. [0003] A major feature of the electric power steering system EPS is the large current, and if the current is too large, it will inevitably lead to a...

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Problems solved by technology

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a thermal management method and system for the electric power steering system, which is used to solve the problem that the temperature of the entire electric power steering system cannot be estimated and thermally protected in the prior art. The problem

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