Solenoid valve: Description: Notes

TCM calculates the best condition using the information from all kinds of sensors. If the solenoid valve receives the information on the oil pressure, the solenoid valve actuates according to the driving signal. All kinds of regulators in the valve body are controlled to change the oil passage and also the line pressure is controlled by TCM.

Fig 1: TCM Communication Diagram

Courtesy of HYUNDAI MOTOR CO.

• PWM (Pulse Width Modulation) Solenoid Valve 

Structure and functions

PWM solenoid valve is composed of five solenoid valves and the oil capacity in the solenoid valve is changed by the electric duty value of TCM. The oil pressure of the valve body and the torque converter engages or disengages the damper clutch. The solenoid valves send the operating oil pressure to the clutches and brakes at the each range and also control the strength and weakness of oil pressure to reduce the shock when shifting the range.

Fig 2: Identifying PWM Solenoid Valve Structure

Courtesy of HYUNDAI MOTOR CO.

Fig 3: Identifying Bracket, Connector, PWM Solenoid Valve And Block

Courtesy of HYUNDAI MOTOR CO.

PWM (Pulse Width Modulation) solenoid