Title: EGR Recirculation at low load in internal combustion engines

Abstract: An internal combustion engine has a conventional principal induction passage. The engine is further provided with an auxiliary induction passage having a smaller cross-section and adapted to discharge a charge into a combustion chamber so as to cause turbulence therein. An auxiliary throttle valve downstream from the principal throttle valve of the system can be closed to cause the preponderant portion of the flow of air or of air/fuel mixture to flow through the auxiliary induction passage at light and medium loads. Exhaust gas recirculation is permitted at light and medium loads and is mixed with the air or air/fuel mixture at said low and medium loads and injected into the cylinder where it is well mixed by the resulting turbulence. As a consequence, higher concentrations of exhaust gas can be recirculated while still enjoying smooth engine operation.

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Inventors: Endo, Yoshinori (Hamamatsu, JP)

Application Number: 911299
Filing Date: 1978-06-01
Publication_date: 1980-03-25
Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Iwata, JP)
Primary Class(es): 123/308 123/432, 123/442
Other Classes:
US Patent Ref:

3882831	May, 1975	Date et al.	123/127.
3941105	Mar, 1976	Yagi et al.	123/127.
4014960	Mar, 1977	Goto et al.	123/127.
4020808	May, 1977	Yagi et al.	123/119.
4022175	May, 1977	Laprade et al.	123/119.
4030464	Jun, 1977	Yamaguchi et al.	123/19A.
4031867	Jun, 1977	Yasuda et al.	123/119.
4051824	Oct, 1977	Katsuhiko	123/119.
4058098	Nov, 1977	Onaka	123/119.
4079716	Mar, 1978	Nakagawa	123/325.
4086885	May, 1978	Noguchi	123/325.

Other Refs: 25216812611806

Nov, 1975	DE
Sep, 1976	DE

Primary Examiner: Burns, Wendell E.
Assistant Examiner:
Attorney: Beutler; Ernest A.