Apparatus and Method for Detecting Leakage of Liquid Fuel into Gas Fuel Rail

摘要

Methods and systems for detecting leakage of a liquid fuel into a gas fuel rail of a dual-fuel system for an internal combustion engine are disclosed. The methods and systems include sending an injection signal from a controller to a fuel injector and subsequently injecting gas fuel and liquid fuel into a cylinder for combustion. A pressure in the gas rail detects the pressure in the gas rail over a pre-determined time period after the injection event. A controller measures pressure fluctuations in the gas rail over a pre-determined time period after the injection event. If the pressure in the gas rail fluctuates by more than the pre-determined amount, the controller is programmed to take at least one mitigating action to prevent or limit damage to the engine.

主权项

1. A method for detecting leakage of a liquid fuel into a gas rail of a dual fuel system for an internal combustion engine, the method comprising:
sending an injection signal from a controller to a fuel injector; injecting gas fuel and liquid fuel into a cylinder for combustion; detecting pressure in the gas rail over a predetermined time period after the injecting; measuring pressure fluctuations in the gas rail over the predetermined time period; and if the pressure in the gas rail fluctuates by more than a predetermined amount, taking at least one mitigating action.