Individual cylinder controller for four-cylinder engine

Details Individual cylinder controller for four-cylinder engine Individual cylinder controller for four-cylinder engine

2006-04-11

2006-04-11

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

C123S673000, C123S406240

Reexamination Certificate

active

07027910

ABSTRACT:
A generic technique for the detection of air-fuel ratio (or torque) imbalances in a 4-cylinder engine equipped with either a production oxygen sensor or a wide-range A/F sensor (or a crankshaft torque sensor) is developed. The method is based on a novel frequency-domain characterization of pattern of imbalances and its geometric decomposition into four basic templates. Once the contribution of each basic template to the overall imbalances is computed, templates of opposite direction are imposed to restore air-fuel ratio (or torque) balance among cylinders. At any desired operating condition, elimination of imbalances is achieved within few engine cycles. The method is applicable to current and future engine technologies with variable valve actuation, fuel injectors and/or individual spark control.

REFERENCES:
patent: 6024070 (2000-02-01), May et al.
patent: 6314952 (2001-11-01), Turin et al.
patent: 6668812 (2003-12-01), Javaherian
patent: 38 02 803 (1988-08-01), None

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