(EN) PROBLEM TO BE SOLVED: To realize the current feedback control of a linear solenoid with high accuracy to the current command value by controlling a drive power supply element to be connected to a winding based on the actual current value carrying in the winding.
SOLUTION: A hydraulic control circuit 10 comprises a control circuit 11, a solenoid drive circuit 12 and a current detection circuit 14. The control circuit 11 outputs the pulse-modulated PWM signal according to the hydraulic command given from an engine control unit, etc., to turn ON/OFF a power element 121 of the solenoid drive circuit 12. When the power element 121 is turned ON, the current flows into a shunt resistor 123 for detecting the current through the power element 121 and a solenoid coil 92 of a solenoid 9. The waveform of the current flowing in the power element 121 is converted into the waveform of the current flowing in the solenoid 92 by the current detection circuit 14, and fed back to the control circuit 11 as the detected current value, and the displacement amount of the solenoid 9 is feedback-controlled.
COPYRIGHT: (C)2000,JPO
【課題】リニアソレノイドの電流フィードバック制御を
電流指令値に対して高精度で高応答に制御することがで
きる自動車用油圧制御装置を提供するにある。
【解決手段】油圧制御回路１０からのＰＷＭ信号によ
り、リニアソレノイド９を動作させて、自動変速機１の
クラッチの締結状態を制御する。
油圧指令と電流検出信
号によってリニアソレノイド９を制御し、さらに、検出
されたソレノイド電流によっても、リニアソレノイドを
制御する。