SYSTEM AND METHOD FOR CLOSING A TANK VALVE
First Claim
1. A method, comprising:
- comparing a tank pressure to one or more of;
a fuel rail pressure and a fuel line pressure, andclosing a tank valve in response to one or more of;
a fuel line pressure lower than a lower threshold and a tank pressure higher than an upper threshold; and
a difference between the fuel rail pressure and regulated pressure above a second threshold.
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Accused Products
Abstract
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.
57 Citations
20 Claims
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1. A method, comprising:
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comparing a tank pressure to one or more of;
a fuel rail pressure and a fuel line pressure, andclosing a tank valve in response to one or more of;
a fuel line pressure lower than a lower threshold and a tank pressure higher than an upper threshold; and
a difference between the fuel rail pressure and regulated pressure above a second threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method, comprising:
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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. - View Dependent Claims (14, 15, 16)
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17. A method for emptying a tank, comprising:
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supplying a gaseous fuel to an engine via a tank; operating the engine with the gaseous fuel and a first valve timing at a first condition when a pressure of the gaseous fuel is greater than a first threshold; operating the engine with the gaseous fuel and a second valve timing at the first condition when the pressure of the gaseous fuel is less than the first threshold; and overriding the supplying based on an overly high gaseous fuel tank pressure and insufficient gaseous rail pressure. - View Dependent Claims (18, 19, 20)
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Specification