Engine control device

Details Engine control device Engine control device

2006-11-14

2006-11-14

Vo, Hieu T. (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C073S117020, C701S110000

Reexamination Certificate

active

07136739

ABSTRACT:
An engine control device for detecting misfire of an engine. Based on a detected crank angle of the engine, an angular velocity at a first crank angle at which the engine speed is close to a minimum within one combustion cycle of each cylinder is calculated as a pre-combustion angular velocity, and an angular velocity at a second crank angle at which the engine speed is close to a maximum within the same combustion cycle is calculated as a post-combustion angular velocity. An amount of rotation variation caused between the first and second crank angles is calculated based on the pre-combustion and post-combustion angular velocities of the same combustion cycle, and is compared with a predetermined misfire criterion to determine whether or not misfire has occurred. When misfire is detected, a required operation is performed, for example, a warning lamp is turned on or the fuel supply quantity is increased.

REFERENCES:
patent: 5197325 (1993-03-01), Tamura et al.
patent: 5333585 (1994-08-01), Kuroda
patent: 5639960 (1997-06-01), Nakagawa
patent: 6530360 (2003-03-01), Kondo
patent: 2000-205035 (2000-07-01), None

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