Method and system for controlling combustion stability for lean-

Details Method and system for controlling combustion stability for lean- Method and system for controlling combustion stability for lean-

1996-12-13

1998-02-24

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Including means responsive to instantaneous change in engine...

F02M 700

Patent

active

057202605

ABSTRACT:
A method and system for controlling combustion stability for a lean-burn engine having a plurality of cylinders including a plurality of cylinder pairs utilizes a speed sensor for sensing an engine speed and generating a corresponding temperature signal and an air flow sensor for sensing a cylinder air mass and generating a corresponding air mass signal. An average event time for each of the plurality of cylinders is determined, as well as an instantaneous variation in event times between each of the plurality of cylinder pairs. An actual level of engine roughness is determined based on the variation in instantaneous event times from the average event times. A desired level of engine roughness is determined based on the speed signal, the air mass signal, and a desired air/fuel ratio. The engine is then controlled based on the actual level of engine roughness and the desired level of engine roughness so as to directly control the combustion stability of the engine and to indirectly control the air/fuel ratio of the engine.

REFERENCES:
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patent: 5357790 (1994-10-01), Hosoya
patent: 5421305 (1995-06-01), Tomisawa
patent: 5426587 (1995-06-01), Imai et al.
patent: 5495415 (1996-02-01), Ribbens et al.
patent: 5515828 (1996-05-01), Cook et al.
patent: 5587524 (1996-12-01), Hampo et al.
"238 Development Of A Lean Limit Control System On The 2.5 Liter Lean-Burn MVV Engine", by Yasuki Tamura et al. (Mitsubishi Motors Corp.), JSAE Conference Proceeding 953, 1995-5 (313-316).

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