Exhaust gas recirculation control method and apparatus for inter

Details Exhaust gas recirculation control method and apparatus for inter Exhaust gas recirculation control method and apparatus for inter

1984-02-03

1987-02-10

Wolfe, Jr., Willis R.

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

F02M 2506

Patent

active

046416242

ABSTRACT:
A method for effecting exhaust gas recirculation control in an exhaust gas recirculation control device of a type including a needle valve provided in an exhaust gas recirculation passage for determining the effective diameter of that passage, a position sensor for providing a signal representing the actual position of the needle valve, and a negative pressure motor for positioning the needle valve. In accordance with the invention, a target value for the needle valve is set according to predetermined operating conditions of the engine. The negative pressure motor is driven with a drive pulse having a time width corresponding to a positional deviation between the target value and the actual position of the needle valve as represented by the signal provided by the position sensor. After driving the negative pressure motor with one such drive pulse, the generation of the next subsequent drive pulse is inhibited for a predetermined period of time longer than the delay times in the device.

REFERENCES:
patent: 4244023 (1981-01-01), Johnson
patent: 4257382 (1981-03-01), Matsui et al.
patent: 4378776 (1983-04-01), Nishimori
patent: 4378777 (1983-04-01), Iida et al.
patent: 4428355 (1984-01-01), Yokooku
patent: 4448177 (1984-05-01), Hasegawa et al.
patent: 4448178 (1984-05-01), Yamato et al.
patent: 4467775 (1984-08-01), Buck et al.

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