A novel temperature compensation method for proportional solenoid

In the clutch-to-clutch shifting control of automatic transmission system, the precise control of oil pressure in the clutch chamber is crucial, for which the proportional solenoid is the key component. The electrical parameters of solenoid will change considerably due to temperature variation, which will result in the change of input-output characteristics of solenoid and the deterioration of shifting quality. In order to realize a smooth shifting control under any temperature circumstance, the electrical, hydraulic and mechanical model of the solenoid are analyzed. The temperature influence on resistance and inductance of solenoid are provided and they can account for the variation of oil pressure and flow. Finally, a novel temperature compensation method for proportional solenoid applied to the automatic transmission system is developed. It can be implemented for embedded devices due to its low computational load. Experimental results are also provided to validate the model and the temperature compensation method.