Altitude dependent fuel injection timing
First Claim
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1. A fuel injection timing control method for injecting a quantity of fuel into an automotive engine, comprising the steps of:
- generating a pressure value representing barometric pressure;
referencing a base value indicating an engine operating angle at which the quantity of fuel is to be delivered to the engine;
referencing an adjustment value as a predetermined function of the generated pressure value;
adjusting the referenced base value in accord with the referenced adjustment value; and
injecting the quantity of fuel substantially at the angle corresponding to the adjusted referenced base value.
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Abstract
The engine operating angle at which a determined fuel injection quantity is delivered to the engine is varied in accord with barometric pressure variations to compensate an engine air-fuel mixing time to offset variations in air-fuel mixture homogeneity prior to combustion, promoting complete combustion, increased engine performance, increased catalytic converter efficiency and durability over a wide range of barometric pressure values.
24 Citations
9 Claims
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1. A fuel injection timing control method for injecting a quantity of fuel into an automotive engine, comprising the steps of:
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generating a pressure value representing barometric pressure; referencing a base value indicating an engine operating angle at which the quantity of fuel is to be delivered to the engine; referencing an adjustment value as a predetermined function of the generated pressure value; adjusting the referenced base value in accord with the referenced adjustment value; and injecting the quantity of fuel substantially at the angle corresponding to the adjusted referenced base value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for determining an engine operating angle at which to deliver a predetermined fuel quantity to the engine, comprising the steps of:
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establishing a base fuel injection timing value; estimating barometric pressure; referencing a fuel injection timing offset value as a predetermined function of barometric pressure; adjusting the base fuel injection timing value by the referenced fuel injection timing offset value; and delivering the predetermined fuel quantity to the engine at the engine operating angle corresponding to the adjusted base fuel injection timing value. - View Dependent Claims (8, 9)
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Specification