• The solenoid reducing pressure generated by the solenoid reducing valve is constantly applied to the step in the right side of the pressure modifier valve.
• When the throttle valve opening angle is small, the duty value of the pressure control solenoid valve is low. The hydraulic pressure applied to the left side of the pressure modifier valve drops due to the pressure control solenoid valve action, moving the modifier valve to the left. The modifier pressure becomes low.
• When the throttle valve opening angle is large, the duty value of the pressure control solenoid valve is high. The hydraulic pressure applied to the left side of the pressure modifier valve is not easily drained by the pressure control solenoid valve, moving the pressure modifier valve to the right. Then modifier pressure becomes high. Through this process, modifier pressure is controlled depending on the throttle valve opening angle.
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1
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Solenoid reducing pressure
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2
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To TCC shift valve
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3
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Pressure control solenoid valve
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4
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Modifier pressure
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5
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Small throttle valve opening angle
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6
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Large throttle valve opening angle
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