Method for achieving temperature compensation of proportional electromagnetic valve based on constant-current control

Abstract

The invention provides a method for achieving temperature compensation of a proportional electromagnetic valve based on constant-current control. The method comprises the following steps that an analog quantity signal is acquired through an electronic control unit; temperature compensation is conducted on the proportional electromagnetic valve; and constant-current control is conducted on the proportional electromagnetic valve. According to the method, the influence of the change of the characteristic of hydraulic oil caused by the temperature change on the gear shifting process is distinguished from the influence of the change of the physical characteristic of the proportional electromagnetic valve on the gear shifting process, the changes of the current characteristic of the proportional electromagnetic valve caused by the two factors are controlled independently, the current value of the electromagnetic valve is set through oil temperature compensation, constant-current control over the proportional electromagnetic valve is achieved through a constant-current control circuit, and thus gear shifting comfort is improved.

Description

technical field [0001] The invention relates to a compensation method, in particular to a temperature compensation method of a proportional solenoid valve based on constant current control. Background technique [0002] At present, the automatic transmission has become more and more popular. As the pilot of the automatic transmission control system, the control of the proportional solenoid valve has an important influence on the shifting quality. The proportional solenoid valve controls the current through the pulse width modulation signal (PWM) signal, and the operating frequency is about 1000Hz, so a small control error will also cause obvious shifting shocks. Accurate proportional solenoid valve control has become a factor that affects the shifting of automatic transmissions of vehicles. Key technologies for comfort. [0003] The temperature will have a great influence on the control characteristics of the proportional solenoid valve. The reason is that the proportional ...

AI Technical Summary

Problems solved by technology

This method cannot distinguish the change of hydraulic oil characteristics caused by temperature from the change of physical characteristics of the proportional solenoid valve itself, and there are problems such as large changes in output current, relatively lagging control, and thus affecting shift comfort.

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