Internal combustion engine air/fuel ratio compensation
AssigneeGeneral Motors Corporation
InventorsDouglas E. Trombley, Kenneth J. Buslepp, William C. Albertson
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Abstract
Engine inlet air/fuel ratio compensation is applied to an internal combustion engine having pneumatic fuel injection, wherein the difference between a value proportional to inlet air pressure and a value proportional to inlet fuel pressure is monitored and a commanded fuel or air quantity adjusted as a predetermined function of the difference.
Claims6
A method for compensating a ratio of fuel to air admitted to an internal combustion engine having pneumatic fuel injection, wherein a quantity of air from a pressurized air supply is provided to inject a quantity of fuel from a fuel supply into the engine, comprising the steps of:
- sensing pressure of fuel from the fuel supply;
- sensing pressure of air from the air supply;
- determining a difference between the sensed fuel pressure and the sensed air pressure;
- generating a compensation value as a predetermined function of the determined difference;
- and
- adjusting a predetermined one of the group consisting of the fuel quantity and the air quantity by the generated compensation value.
An apparatus for compensating a ratio of fuel to air admitted to an internal combustion engine having pneumatic fuel injection, wherein a quantity of air from a pressurized air supply is provided to inject a quantity of fuel from a fuel supply into the engine, comprising:
- a fuel pressure sensor positioned to sense pressure of fuel from the fuel supply;
- an air pressure sensor positioned to sense pressure of air from the air supply;
- means for determining a difference between sensed fuel pressure and sensed air pressure;
- means for generating a compensation value as a predetermined function of the determined difference;
- and
- means for adjusting a predetermined one of the group consisting of the fuel quantity and the air quantity by the generated compensation value.
Dependencies are inferred from the claim text.