Title: Exhaust gas recirculation control

Abstract: In an internal combustion engine, an exhaust gas recirculation control assembly and an ignition timing control assembly are operated by an induction passage pressure signal transmitted through a control unit. The control unit interrupts the induction passage pressure signal to cut off exhaust gas recirculation and advance ignition timing following operation at an induction passage pressure signal below a particular level for a selected period of time, such as will occur when the engine powers a vehicle during highway driving.

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Inventors: Weathers, Lawrence M. (Warren, MI, US)
Wellenkotter, Carl A. (Rochester, MI, US)

Application Number: 900173
Filing Date: 1978-04-26
Publication_date: 1980-04-01
Assignee: General Motors Corporation (Detroit, MI)
Primary Class(es): 123/568.29
Other Classes:
US Patent Ref:

3800764	Apr, 1974	Goto et al.	123/119.
3955364	May, 1976	Lewis	123/119.
3962868	Jun, 1976	Matumoto et al.	123/119.
3992878	Nov, 1976	Moorman	123/119.
4050423	Sep, 1977	Inada et al.	123/117.
4111172	May, 1978	Nishizawa et al.	123/119.
4117814	Oct, 1978	Takahashi	123/119.

Other Refs:
Primary Examiner: Burns, Wendell E.
Assistant Examiner:
Attorney: Veenstra; C. K.