Electronic flow sensor

摘要

A safety shut-off device is provided for a liquid gas system for vehicles and/or vehicle trailers, in order to avoid an inadvertent release of gas. The device includes an electromagnetic gas valve for supplying/shutting off the gas, an electronic unit for activating the electromagnetic gas valve, and a flow sensor for determining a current gas flow being discharged from a storage tank. Furthermore, the device includes an evaluation unit for comparing the current gas flow to a previous gas flow or to a gas flow which is indicated by the gas consumers and is to be expected. If, during use, the evaluation unit determines a current gas flow which differs by more than a maximum permissible rate of change from the previous gas flow or from an expected gas flow, the electromagnetic gas valve is activated via the electric unit in order to shut off the supply of gas.

主权项

1. A safety shut-off device for a liquid gas system having at least one gas consumer for a vehicle and/or vehicle trailer for avoiding an unwanted release of gas, the device comprising:
a) an electromagnetic gas valve for shutting off a gas supply to the liquid gas system; b) a flow sensor for periodically detecting a current gas flow Fa being discharged from a gas source; c) an evaluation unit that, for each time a current gas flow Fa is detected by the flow sensor, compares the current gas flow Fa to an immediately preceding detected gas flow Fv; and d) an electronic unit which controls the electromagnetic gas valve for shutting off the gas supply when the evaluation unit detects a current gas flow Fa which differs from the immediately preceding detected gas flow Fv by more than a maximum admissible gas flow change rate Δmax, such that the gas supply is shut off when the following condition is fulfilled: Fa −Fv>Δmax.