Electronic fuel injection control
AssigneeGeneral Motors Corporation
InventorDah-Lain Tang
Life of this patent
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Abstract
In engine fuel control applications in which a fuel command is issued to control at least a pair of fuel injectors, fuel command compensation is provided to stabilize fuel control from injection to injection while retaining fuel delivery accuracy. Fuel control performance over a control period is modelled, and the model stabilized through modern control techniques. Non-linear compensation is applied to reduce any residual fueling error, and both synchronous and asynchronous transient compensation are provided.
Claims12
A method of controlling a magnitude of a fuel command periodically issued to control at least one pair of fuel injectors in an internal combustion engine, wherein a base fueling requirement is determined each time the fuel command is to be issued to the pair of injectors, comprising the steps of:
- sensing an engine operating level;
- determining a present base fuel requirement over an engine cycle in accord with the sensed engine operating level;
- developing a fueling performance model describing the manner in which past base fuel requirements have been provided for over a predetermined control period, as a predetermined function of base fuel requirements and fuel commands issued over the control period;
- determining a present fuel command in accord with the developed model;
- and
- issuing the present fuel command to control at least the one pair of fuel injectors.
A method of controlling a magnitude of a fuel command periodically issued to control at least one pair of fuel injectors in an internal combustion engine, wherein a base fueling requirement is determined each time the fuel command is to be issued to the pair of injectors, comprising the steps of:
- sensing an engine operating level;
- determining a present base fuel requirement over an engine cycle in accord with the sensed engine operating level;
- developing a fueling performance model describing the manner in which past base fuel requirements have been provided for over a predetermined control period, as a predetermined function of base fuel requirements and fuel commands issued over the control period;
- determining a present fuel command in accord with the developed model;
- calculating a fuel delivery error as the difference between the present base fuel requirement for the engine cycle and the sum of the present fuel command and a past fuel command;
- comparing the magnitude of the fuel delivery error to an error threshold value;
- adjusting the present fuel command in direction to reduce the magnitude of the fuel delivery error to the error threshold value when the magnitude of the fuel delivery error exceeds the error threshold value;
- and
- issuing the adjusted present fuel command to control at least the one pair of fuel injectors.
Dependencies are inferred from the claim text.