Transient fueling compensation
AssigneeGeneral Motors Corporation
InventorsDouglas E. Trombley, Kenneth J. Buslepp, William C. Albertson
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Abstract
Air/fuel ratio control compensation is applied to an internal combustion engine having pneumatic fuel injection, wherein an engine operating condition is determined and appropriate compensation provided to the fuel command when an operating condition is sensed in which a significant fuel residue remains in the pneumatic injector after the end of an injection period.
Claims5
A method for compensating a fuel command issued to a fuel injector of an internal combustion engine having pneumatic fuel injection wherein pressurized air is provided to inject a fuel quantity held within the fuel injector into the engine while the injector is opened during a cylinder injection period, comprising the steps of:
- generating the fuel command;
- sensing a rate of change in the fuel command;
- determining a compensation value as a predetermined function of the sensed rate of change;
- and
- calculating a compensated fuel command as a predetermined function of the generated fuel command and of the compensation value.
A method for compensating a commanded fueling rate to an internal combustion engine having pneumatic fuel injection wherein pressurized air drives a quantity of fuel into the engine, comprising the steps of:
- generating a fuel command;
- sensing a transient maneuver of the engine, by (a) determining a rate of change in the fuel command, (b) comparing the determined rate of change to a predetermined threshold rate of change, and (c) sensing a transient maneuver of the engine when the determined rate of change exceeds the threshold rate of change;
- and
- compensating the generated fuel command when a transient maneuver is sensed, comprising the steps of (a) sensing a predetermined engine operating condition, (b) determining a compensation factor as a predetermined function of the sensed predetermined engine operating condition, and (c) adjusting the generated fuel command by the compensation factor.
Dependencies are inferred from the claim text.