Exhaust gas recirculation control system

Details Exhaust gas recirculation control system Exhaust gas recirculation control system

1986-02-25

1987-09-01

Wolfe, Jr., Willis R.

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

F02M 2506

Patent

active

046901205

ABSTRACT:
A closed loop system for controlling exhaust gas recirculation (EGR) in an automotive engine. An electrical program command signal from an on-board engine computer/controller actuator through a motor driven circuit, a stepper motor to turn an axial lead screw having a follower thereon connected to a rod for moving the valve poppet to control flow. An orifice plate with differential flow pressure taps is disposed in the EGR passage downstream of a flow control valve poppet. The differential pressure from the taps is sensed by a pressure responsive diaphragm. A stationary proximity sensor using an eddy current principle detects changes in position of the diaphragm and in response thereto generates an electrical feedback signal proportional to EGR flow through the orifice which compared with the command signal to generate a control signal for controlling the stepper motor.

REFERENCES:
patent: 4142495 (1979-03-01), Lahiff
patent: 4290404 (1981-09-01), Hata et al.
patent: 4318385 (1982-03-01), Yamaguchi
patent: 4399798 (1983-08-01), Stoltman
patent: 4528968 (1985-07-01), Otobe
patent: 4561408 (1985-12-01), Jenkins
patent: 4566423 (1986-01-01), Kenny et al.

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