F - Mech Eng,Light,Heat,Weapons – 02 – D
Patent
F - Mech Eng,Light,Heat,Weapons
02
D
341/38.123
F02D 28/00 (2006.01) F02D 21/08 (2006.01) F02D 41/14 (2006.01) F02D 41/26 (2006.01) F02D 43/00 (2006.01) F02M 7/24 (2006.01) F02M 23/04 (2006.01) F02P 5/15 (2006.01)
Patent
CA 1152186
ABSTRACT OF THE DISCLOSURE An apparatus for controlling the operation of an internal combustion engine of carburetor type, especially, the air-fuel ratio and the rate of exhaust gas recirculation, is disclosed. The air-fuel ratio of the air-fuel mixture supplied to the engine in the steady operating condition of the engine is controlled on the basis-of predetermined data determined relative to the engine rotation speed and intake vacuum and stored previously in a memory. A three-way catalyst is used to purify engine exhaust gases, and an output signal from an °2 sensor in the exhaust system is fed back for the control of the air-fuel ratio in the engine exhaust gases. A circuit is provided to check whether this feedback control is normally carried or not. The air-fuel ratio of the air-fuel mixture supplied to the engine in an unsteady operating condition of the engine is controlled by regulating the amounts of fuel and air supplied to the engine while bypassing the carburetor, on the basis of the sensed values of the intake vacuum, engine rota- tion speed and engine temperature and also on the throttle valve position. For the control of the rate of exhaust gas recirculation, an upper limit and a lower limit of the rate of opening of a recirculation rate regulating valve are determined on the basis of the sensed throttle valve opening, and another predetermined data determined relative to the engine rotation speed and intake vacuum is read out from the memory to limit the rate of opening of the recirculation rate regulating valve.
343258
Abe Osamu
Atago Takeshi
Furuhashi Toshio
Hasegawa Taiji
Kosuge Tokuo
Hitachi Ltd.
Kirby Eades Gale Baker
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