Engine controller with adaptive fuel compensation

Details Engine controller with adaptive fuel compensation Engine controller with adaptive fuel compensation

1995-07-26

1996-09-03

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02D 4114

Patent

active

055514103

ABSTRACT:
An Electronic Engine Controller (EEC) determines the actual dynamic response of an engine which uses a switching type Heated Exhaust Gas Oxygen Sensor (HEGO) by imposing a bias on the air/fuel (A/F) mixture when the engine is operating at steady state conditions and is combusting a stoichiometric A/F mixture. The A/F mixture is then abruptly altered and maintained for a predetermined period of time, and the time elapsed from the abrupt alteration to detection of the abrupt alteration by the HEGO sensor is measured and stored. Upon expiration of the predetermined period of time, the A/F mixture is abruptly altered to the biased A/F mixture and the time elapsed from the abrupt alteration to the biased value to the detection of the abrupt alteration is measured and stored. The bias value is then removed to return the A/F mixture to stoichiometry and the process is repeated for a plurality of bias values. The actual dynamic response of the engine is then determined as a function of the stored time durations. The actual dynamic response is compared to a predetermined response range and the fuel flow characteristics of the engine are altered if the actual dynamic response is outside of the predetermined response range.

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