Patent ID: 8662235

Claim:
A vehicle safety system for disabling a compressed natural gas-fueled vehicle while fueling, comprising: a first sensor adapted to sense presence of a high pressure natural gas fill hose in proximity to a tank fill adapter coupled to a high pressure natural gas tank; a second sensor adapted to sense an open/closed position of a fill access cap, said fill access cap closing a compartment containing said tank fill adapter; a third sensor adapted to sense an open/closed position of an isolation valve, said isolation valve isolating said tank fill adapter from said high pressure natural gas tank when closed; a logic circuit adapted to combine inputs from said first, second and third sensors to produce a safe electrical signal indicating a safe condition when said fill hose is not in proximity to said tank fill adapter, said fill access cap is closed, and said isolation valve is closed; a lockout circuit adapted to disable said vehicle when said safe electrical signal is absent.