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US 7,252,072 B2Granted
Methods and systems of diagnosing fuel injection system error
AssigneeCummins Inc.
InventorsTodd Slater, John E. Rogers, Michael D. Zieles
Life of this patent
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Abstract
A fueling system for an internal combustion engine. The system has a voltage booster and a fuel injector. The voltage booster is operatively coupled to the injector to selectively drive the injector. A method includes determining compliance of a booster voltage with a threshold. The method further includes diagnosing fuel system error based upon the determining compliance.
Claims5
A method comprising:
- providing an internal combustion engine having a fuel injector and a booster capacitor, the booster capacitor operable to discharge to the injector and recharge after discharging, the booster capacitor having a voltage varying with the discharging and recharging;
- first determining whether the voltage has met or exceeded a first value, the first determining includes measuring a voltage value across the booster capacitor and providing the voltage value to a controller;
- storing or indicating an error or failure of the system based upon the first determining;
- second determining whether the voltage has met or exceeded a second value, the second determining includes measuring a voltage value across the booster capacitor and providing the voltage value to a controller;
- and
- disabling the fuel injector based upon said second determining.
3 more elements
Dependencies are inferred from the claim text.