Air/fuel ratio control system for lean combustion engine using t

Details Air/fuel ratio control system for lean combustion engine using t Air/fuel ratio control system for lean combustion engine using t

1987-03-12

1988-03-08

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60276, 60277, F01N 320

Patent

active

047292202

ABSTRACT:
The invention relates to a control system for feedback control of the air/fuel ratio in an internal combustion engine which uses a three-way catalyst to purify the exhaust gas, and which may be an automotive engine, by using an exhaust sensor to detect actual values of air/fuel ratio in the engine. The control system has the function of varying the target value of air/fuel ratio according to operating conditions of the engine such that the target value becomes super-stoichiometric at least in a portion of a steady zone of the engine operating conditions. The control system includes means to detect the temperature of the three-way catalyst and means to vary the feed of fuel or air to the engine when the catalyst temperature is above a predetermined level, e.g. 750.degree. C., while the target value of the air/fuel ratio is super-stoichiometric such that the actual air/fuel ratio decreases to a predetermined value, e.g. stoichiometric value, which is optimum for the activities of the three-way catalyst, or to a still lower value. Such intentional change in the air/fuel ratio under the high exhaust temperature condition is effective in preventing early deterioration of the three-way catalyst.

REFERENCES:
patent: 4099491 (1978-07-01), Reddy
patent: 4148188 (1979-04-01), Tokura
patent: 4192140 (1980-03-01), Yamashita
patent: 4319451 (1982-03-01), Tajima
patent: 4376369 (1983-03-01), Horikoshi
patent: 4526001 (1985-07-01), Burns
patent: 4617794 (1986-10-01), Fujitani
Nainen Kikan, vol. 23, No. 12, (1984), S. Matsushita et al., pp. 33-40.

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