| 摘要 |
PURPOSE: A warning display circuit of a fuel gauge in a vehicle is provided to turn on a warning lamp stably regardless of shaking of the vehicle in warning the fuel compensation by detecting decrease of the fuel remaining amount. CONSTITUTION: A warning circuit of a fuel gauge is composed of a lighting control unit(21) charging input voltage and supplying drive control voltage to a lamp driving unit(22) in decreasing the fuel amount below the reference value; the lamp driving unit lighting a warning lamp with the control voltage from the lighting control unit; and a lights-out delay unit(23) restricting charge voltage of the lighting control unit below the predetermined level in detecting the fuel amount over the reference value by a fuel amount detecting switch with applying lighting delay time, and delaying lights-out with a discharge loop in lighting the lamp by detecting the fuel amount over the reference value. The warning lamp is turned on stably in detecting the fuel amount incorrectly.
|
