System and method for closing a tank valve

摘要

A method for closing a storage tank valve in response to leaks in a fuel line or fuel rail and emptying the tank of a vehicle when no leaks are detected is described. The method includes comparing a tank pressure to a fuel line or fuel rail pressure in order to detect leaks therein and further includes using a dedicated tank pressure sensor to measure the gaseous pressure of the storage tank, and thereby the amount of fuel remaining. In response to leaks in the fuel system, a controller may close an electronic solenoid valve, which reinforces a mechanical excess flow valve, to block the flow of fuel and prevent fuel loss from the gaseous storage tank.

主权项

1. A method, comprising:
emptying a fuel tank by solely supplying a gaseous fuel to an engine when a gaseous fuel tank pressure is high, and supplying the gaseous fuel and a liquid fuel when the gaseous fuel tank pressure is low; and overriding the emptying by closing a gaseous fuel tank valve in response to a low pressure downstream of the gaseous fuel tank valve and a high tank pressure.