EGO based adaptive transient fuel compensation for a spark ignited engine
AssigneeMotorola, Inc.
InventorsDarren A. Schumacher, Kevin J. Bush
Life of this patent
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Abstract
A method and system for adaptive transient fuel compensation in a cylinder of an engine (300) estimates a fraction of fuel evaporated in a fuel intake system of the engine (b.sub.v) by measuring a temporal delay (515) between when an identification fuel charge is injected (505) and when a binary-type exhaust gas oxygen sensor (315) switches state. An estimate of a fraction of fuel adhering to the fuel intake system of the engine (c) is derived from the estimate of evaporation wall-wetting parameter (b.sub.v). Fuel delivery to the engine is adjusted dependent on the estimates of the adhering wall-wetting parameter (c) and the evaporation wall-wetting parameter (b.sub.v).
Claims17
A method of adaptive transient fuel compensation for an engine comprising the steps of:
- injecting an identifying fuel charge into the engine;
- measuring a duration between when the identifying fuel charge is injected in the step of injecting, and when a binary-type exhaust gas oxygen sensor switches state;
- translating the duration measured in the step of measuring a duration, into an estimate of a fraction of fuel evaporated in a fuel intake system of the engine (b.sub.v);
- estimating a fraction of fuel adhering to the fuel intake system of the engine (c) dependent on the (b.sub.v) determined in the step of translating;
- and
- adjusting a base fuel charge to the engine, dependent on the (b.sub.v) determined in the step of translating and the (c) determined in the step of estimating.
A method of adaptive transient fuel compensation for a cylinder in a engine comprising the steps of:
- generating a base fuel charge signal;
- generating an identifying fuel charge signal;
- combining a base fuel charge signal and the identifying fuel charge signal and injecting a combined fuel charge into the engine responsive to the combined signal;
- measuring a temporal delay between when the combined fuel charge is injected in the step of combining and injecting and when a binary-type exhaust gas oxygen sensor switches state;
- and
- adjusting the base fuel charge signal, dependent on the temporal delay measured in the step of measuring.
A system of adaptive transient fuel compensation for an engine comprising:
- means for generating a base fuel charge signal;
- means for generating an identifying fuel charge signal;
- means for combining a base fuel charge signal and the identifying fuel charge signal and injecting a combined fuel charge into the engine responsive to the combined signal;
- means for measuring a temporal delay between when the combined fuel charge is injected by the means for combining and injecting and when a binary-type exhaust gas oxygen sensor switches state;
- means for translating the duration measured by the means for measuring, into an estimate of a quantity of fuel evaporated in a fuel intake system of the engine (b.sub.v);
- means for estimating a quantity of fuel adhering to the fuel intake system of the engine (c) dependent on the (b.sub.v);
- and
- means for adjusting the base fuel charge signal, dependent on the (b.sub.v) and (c) determined by the means for translating, and means for estimating respectively.
Dependencies are inferred from the claim text.