Methods and system for diagnosing a high-pressure fuel pump in a fuel system
AssigneeTransportation IP Holdings, LLC
InventorsMorse N. Taxon, Pradheepram Ottikkutti
Life of this patent
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Abstract
Systems and methods are provided herein for tracking degradation of a high-pressure fuel pump. In one example, a fuel system controller is configured to receive an output pressure signal from a pressure sensor, transform the output pressure signal to the frequency domain to generate frequency content of the output pressure signal, and diagnose a condition of a fuel pump based at least in part on the frequency content of the output pressure signal, the fuel pump fluidly coupled to a fuel injector via a common fuel rail, and the fuel injector is operable to inject fuel to a cylinder of an engine.
Claims18
A fuel system, comprising:
- a fuel pump operable to increase fuel pressure from a first pressure to a second pressure, the fuel pump including a plurality of pumping chambers, each pumping chamber including a piston actuatable by one or more cam lobes coupled to a common pump drive shaft, and each pumping chamber further including a respective check valve;
- a common fuel rail fluidly coupled to the fuel pump and to a fuel injector, and the fuel injector is operable to inject fuel to a cylinder of an engine;
- a pressure sensor operable to detect a pressure of fuel in the common fuel rail;
- and
- a controller operable to:
- receive an output pressure signal from the pressure sensor;
- transform the output pressure signal to the frequency domain to generate frequency content of the output pressure signal;
- diagnose a condition of the fuel pump based at least in part on the frequency content of the output pressure signal;
- and
- differentiate between degradation of a fuel flow control valve upstream of the fuel pump and degradation of the fuel pump.
A fuel system controller configured to:
- receive an output pressure signal from a pressure sensor;
- transform the output pressure signal to the frequency domain to generate frequency content of the output pressure signal;
- diagnose a condition of a fuel pump based at least in part on the frequency content of the output pressure signal, the fuel pump fluidly coupled to a fuel injector via a common fuel rail, and the fuel injector is operable to inject fuel to a cylinder of an engine;
- and
- differentiate between degradation of a fuel flow control valve upstream of the fuel pump and degradation of the fuel pump.
A fuel system for a vehicle, comprising:
- a first fuel pump;
- a second fuel pump, each of the first fuel pump and the second fuel pump including a plurality of pumping chambers, each pumping chamber including a piston actuatable by one or more cam lobes coupled to a common pump drive shaft, and each pumping chamber further including a respective check valve;
- a common fuel rail fluidly coupled to the first fuel pump and/or the second fuel pump and to a fuel injector, and the fuel injector is operable to inject fuel to a cylinder of an engine;
- a first pressure sensor operable to detect a pressure of fuel output by the first fuel pump;
- a first inlet metering valve (IMV) positioned upstream of the first fuel pump;
- a second pressure sensor operable to detect a pressure of fuel output by the second fuel pump;
- a second IMV positioned upstream of the second fuel pump;
- and
- a controller operable to:
- open the first IMV and close the second IMV to operate the engine with only the first fuel pump;
- receive a first output pressure signal from the first pressure sensor;
- transform the first output pressure signal to the frequency domain to generate first frequency content of the first output pressure signal;
- close the first IMV and open the second IMV to operate the engine with only the second fuel pump;
- receive a second output pressure signal from the second pressure sensor;
- transform the second output pressure signal to the frequency domain to generate second frequency content of the second output pressure signal;
- and
- diagnose a condition of the first fuel pump and/or the second fuel pump based at least in part on the first frequency content and the second frequency content.
Dependencies are inferred from the claim text.