Engine exhaust gas recirculation (EGR)

Details Engine exhaust gas recirculation (EGR) Engine exhaust gas recirculation (EGR)

1991-03-22

1992-03-10

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

251 65, 25112908, 335222, F03M 2507, F16K 3108

Patent

active

050942182

ABSTRACT:
EGR is controlled by a valve whose actuator is a moving electromagnetic coil through which control current representing the desired degree of valve opening is conducted. The coil is disposed in an air gap of a magnetic circuit such that the magnetic flux passes radially through the coil. A coil spring biases the valve closed when there is no current flow through the coil. When control current is conducted through the coil, there is an interaction with the magnetic flux causing the exertion of an electromagnetic force on the coil against the spring force. Relative pressure acting on opposite sides of the valve will assist the coil motion. As a result the coil moves in a direction to increasingly compress the spring until the spring force balances the electromagnetic force. Consequently the valve is opened in an amount proportional to the control current. The motion of the coil is also electromagnetically damped, and a position sensor provides a feedback signal of the valve position.

REFERENCES:
patent: 4643394 (1987-02-01), Shimura et al.
patent: 4690371 (1987-09-01), Bosley et al.
patent: 4749167 (1988-06-01), Gottschall
patent: 4805582 (1989-02-01), Braun et al.
patent: 4883025 (1989-11-01), Richeson, Jr.
patent: 4961413 (1990-10-01), Grey et al.

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