Fuel pump diagnostic apparatuses, methods, and systems
AssigneeCummins Inc.
InventorsMichael R. Tidwell, Abhishek Javvaji, Sarah E. Gnau
Life of this patent
Estimating the term…
Abstract
A method of testing a fuel pump of an engine includes cranking the engine with a starter motor, inhibiting fuel injection to the engine concurrent with the cranking and opening an inlet metering valve to provide fuel to the fuel pump concurrent with the cranking and the inhibiting. The method includes measuring fuel pressure at or downstream of an outlet of the pump concurrent with the cranking, the inhibiting, and the opening, and diagnosing a condition of the pump in response to the measuring.
Claims20
A method of testing a fuel pump of an engine, the method comprising:
- cranking the engine with a starter motor;
- inhibiting fuel injection to the engine concurrent with the cranking;
- opening an inlet metering valve to provide fuel to the fuel pump concurrent with the cranking and the inhibiting;
- measuring fuel pressure at or downstream of an outlet of the pump concurrent with the cranking, the inhibiting, and the opening;
- diagnosing a condition of the pump in response to the measuring;
- and
- terminating the cranking and one of (a) disinhibiting fuel injection and allowing the engine to start, and (b) and allowing the engine to stop.
A system comprising:
- an engine system including a fueling system including a fuel pump, and a starter motor operatively coupled with the engine, and an electronic control unit (ECU) configured to perform the operations of:
- cranking the engine with a starter motor;
- inhibiting fuel injection to the engine concurrent with the cranking;
- opening an inlet metering valve to provide fuel to the fuel pump concurrent with the cranking and the inhibiting;
- measuring fuel pressure at or downstream of an outlet of the pump concurrent with the cranking, the inhibiting, and the opening;
- diagnosing a condition of the pump in response to the measuring;
- and
- terminating the cranking and one of (a) disinhibiting fuel injection and allowing the engine to start, and (b) and allowing the engine to stop.
An apparatus for testing a fuel pump of an engine, the apparatus comprising:
- a non-transitory memory medium configured to store instructions executable by a processor to perform the acts of:
- cranking the engine with a starter motor;
- inhibiting fuel injection to the engine concurrent with the cranking;
- opening an inlet metering valve to provide fuel to the fuel pump concurrent with the cranking and the inhibiting;
- measuring fuel pressure at or downstream of an outlet of the pump concurrent with the cranking, the inhibiting, and the opening;
- diagnosing a condition of the pump in response to the measuring;
- and
- terminating the cranking and one of (a) disinhibiting fuel injection and allowing the engine to start, and (b) and allowing the engine to stop.
Dependencies are inferred from the claim text.