System and Method for Controlling Fuel Injection
AssigneeCummins Inc.
InventorsDaniel D. Wilhelm, David L. Buchanan
Life of this patent
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Abstract
The operation of a fuel injector for an internal combustion engine is controlled, wherein the fuel injector has an on time comprising a pull-in time during which injector current increases to a pull-in current followed by a hold time during which the injector current is limited to a hold current that is less than the pull-in current. A control circuit receives a pressure signal from a pressure sensor that corresponds to a pressure of fuel supplied to the fuel injector for injection into the engine, correlates the pressure signal with fuel pressure, and decreases the pull-in time with increasing fuel pressure.
Claims21
A method of controlling operation of a fuel injector for an internal combustion engine, the fuel injector having an on time comprising a pull-in time during which injector current increases to a pull-in current followed by a hold time during which the injector current is limited to a hold current that is less than the pull-in current, the method comprising:
- receiving a pressure signal from a pressure sensor that corresponds to a pressure of fuel supplied to the fuel injector for injection into the engine,
- correlating the pressure signal with fuel pressure, and
- decreasing the pull-in time with increasing fuel pressure.
A method of controlling operation of a fuel injector for an internal combustion engine, the fuel injector having an on time comprising a pull-in time during which injector current increases to a pull-in current followed by a hold time during which the injector current is limited to a hold current that is less than the pull-in current, the method comprising:
- receiving a pressure signal from a pressure sensor that corresponds to a pressure of fuel supplied to the fuel injector for injection into the engine,
- correlating the pressure signal with fuel pressure, and
- modifying the pull-in time based on the fuel pressure such that the pull-in time decreases with increasing fuel pressure and increases with decreasing fuel pressure.
A system for controlling operation of a fuel injector for an internal combustion engine, comprising:
- a pressure sensor configured to produce a pressure signal corresponding to a pressure of fuel supplied to the fuel injector for injection into the engine, and
- a control circuit including a memory having instructions stored therein that are executable by the control circuit to process the pressure signal to determine a fuel pressure, to control an on-time of the fuel injector, the on-time including a pull-in time during which injector current increases to a pull-in current followed by a hold time during which the injector current is limited to a hold current that is less than the pull-in current, and to modify the pull-in time such that the pull-in time decreases with increasing fuel pressure.
Dependencies are inferred from the claim text.