Method and system for engine control
AssigneeFord Global Technologies, LLC
InventorRoss Dykstra Pursifull
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for fuel systems including a gaseous fuel. Fuel rail over-pressure may be addressed by temporarily closing a fuel tank valve of the gaseous fuel and initiating diagnostics routines to determine if a pressure regulator is degraded. If the pressure regulator is degraded, one or more fuel system components may be adjusted to enable fuel rail pressure control.
Claims21
A method of operating a fuel system configured to deliver a gaseous fuel to an engine, comprising:
- during selected conditions,
- sequentially opening a tank valve and a fuel rail valve of the fuel system;
- and
- indicating degradation of a pressure regulator of the fuel system based on a change in fuel rail pressure during the sequential opening.
A method of operating a fuel system configured to deliver a first, gaseous fuel from a first fuel tank to an engine via a first fuel rail, comprising:
- in response to a fuel rail pressure of the first fuel rail being higher than a threshold, closing a tank valve of the first fuel tank.
A fuel system, comprising:
- a fuel tank, including a tank valve, configured to store a gaseous fuel;
- a fuel rail for delivering the gaseous fuel to an engine;
- a pressure regulator for regulating a fuel rail pressure of the gaseous fuel, the pressure regulator including a mechanical regulator coupled upstream of a fuel rail valve in the fuel rail;
- and
- a control system with computer readable instructions for:
- when the gaseous fuel is not being delivered to the engine,
- sequentially opening the tank valve and the fuel rail valve;
- and
- indicating degradation of one or more of the mechanical regulator and the fuel rail valve based on a change in fuel rail pressure during the sequential opening.
Dependencies are inferred from the claim text.