Internal-combustion engines – Charge forming device – Alternate or simultaneous lean-rich
Patent
1995-04-10
1998-09-08
Dolinar, Andrew M.
Internal-combustion engines
Charge forming device
Alternate or simultaneous lean-rich
123492, F02D 4104
Patent
active
058030484
ABSTRACT:
A system for controlling fuel injection in an internal combustion engine such that when the target air-fuel ratio is switched from a rich value to a lean value, the air-fuel ratios are switched to the lean value by sequentially decreasing the amount of fuel injected into the cylinders, for example in a four cylinder engine into the #1, #2, #3 and #4 cylinders, with predetermined time differences. During this time, an electronic air control valve (EACV) is controlled in such a manner that it is stepwise opened with the switching of the air-fuel ratios for the #1, #2, #3 and #4 cylinders, thereby causing the engine torque to remain the same to prevent the generation of a torque shock. When the target air-fuel ratio has been switched from the lean level to the rich level, the amounts of fuel injected into the #1, #2, #3 and #4 cylinders are controlled in such a manner that they are sequentially increased with predetermined time differences, and the EACV is controlled in such a manner that it is stepwise closed. Thus, it is possible to avoid the generation of a torque shock, while preventing the degradation of the emission during switching of the air-fuel ratio.
REFERENCES:
patent: 3842811 (1974-10-01), Shinoda et al.
patent: 4709674 (1987-12-01), Bianchi et al.
Hayashi Masanori
Kimura Eisuke
Kinoshita Kenichiro
Tatara Yusuke
Yano Toru
Dolinar Andrew M.
Honda Giken Kogyo Kabushiki Kaisha
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