EGR Control Module: Description and Operation

Linear EGR System.:

Linear EGR Module.:

LINEAR EGR SYSTEM





Based on the inputs to the PCM a pintle position (pulse width) is commanded to the EGR module. The EGR module then reads this signal and commands a pintle position to the linear EGR valve directly. The EGR module connection consists of ignition voltage, a ground circuit, an input signal from the PCM and the EGR valve control circuit.

The EGR module is required because the PCM driver does not have the current capability to drive the EGR valve on its own.



The solenoid (bobbin and coil) assembly is energized by current which enters the valve through an electrical connector (terminal "E"), then flows through the solenoid assembly to the control module and creates an electromagnetic field. This field causes the armature assembly to be pulled upward, lifting the pintle a variable amount off the base.

The exhaust gas then flows from the cylinder head exhaust port (through the orifice) to the intake manifold. The height of the pintle is read by the pintle position sensor, and the control module closes the loop as desired position versus actual position read, changing the pulse width modulated command to the solenoid accordingly, until the actual pintle position equals the desired pintle position.