Function

Function

This solenoid valve makes it possible to meter the pressure operating the advance according to the transfer pressure.

3. Advance solenoid valve
4. a. Advance piston
5. b. Ball joint
6. c. Return spring
7. d. Cam seal

Description

Operation:

• a piston (a), housed in the casing, is connected to the cam seal (d) by means of a ball joint (b)
• a return spring (c) allows the movement of the piston (a) when the latter is not subject to the transfer pressure
• the pressure that operates the piston is modified by the return flow rate managed by a solenoid valve (3), fastened to the hydraulic head by the casing
• the solenoid valve operation is through DC-Duty Cycle voltage, from a signal coming from the injection control unit.

When the solenoid valve is not supplied (closed):

• the return flow rate is nil
• the transfer pressure forms behind the piston which moves and decreases the advance increase.

When the solenoid valve is supplied (open):

• the return flow rate is maximum
• the pressure on the advance piston decreases
• the spring retracts the piston, decreasing the advance.

Electrical specifications

Destination of the connector contacts (2-way black):

• pin 1: supply
• pin 2: advance solenoid valve.

Operation: injection control unit (earth)

Variable voltage operation (DC - Duty Cycle):

• full supply (maximum DC) = minimum advance (injection delay)
• no supply (minimum DC) = maximum advance
• resistance at 25°C = 12 ±1 Ohm

Location

The advance adjustment solenoid valve is located on the injection pump.