System Description

Fig. 97 Injection timing advance system. (Typical):

This system, Fig. 97, is designed to control the formation of hydrocarbon emission. This system controls the amount of recirculating fuel in the fuel injection pump in order to control injection timing. This system is composed of injection timing control solenoid, revolution sensor, potentiometer, and EGR control unit This system is also called a partial load advancer. The solenoid valve is controlled by engine load and speed and its functional area is the same as used in the EGR control system. The revolution sensor, potentiometer, and EGR control unit are co-used in the EGR control system. The solenoid valve is activated by the electrical signal from the EGR control unit Therefore, injection timing is advanced when the EGR is activated This system is also deactivated when water temperature is either low or extremely high. The water temperature sensor is co-used in the EGR control system.