초록 ▼

To prevent electrochemical corrosion in a conventional float operated variable resistance fuel level detector due to alcohol in the fuel a current pulse is applied to the detector unit once a minute for a period of 1/1000 second. A solid state circuit stores the level reading between pulses and driv

To prevent electrochemical corrosion in a conventional float operated variable resistance fuel level detector due to alcohol in the fuel a current pulse is applied to the detector unit once a minute for a period of 1/1000 second. A solid state circuit stores the level reading between pulses and drives the fuel gauge.

대표청구항 ▼

In a fuel level indicating system having a sending unit comprising a variable resistor subject to electrochemical corrosion and a display unit for indicating fuel level, an interface circuit for energizing the sending unit and driving the display unit comprising; means coupled to the sending unit fo

In a fuel level indicating system having a sending unit comprising a variable resistor subject to electrochemical corrosion and a display unit for indicating fuel level, an interface circuit for energizing the sending unit and driving the display unit comprising; means coupled to the sending unit for generating a series of spaced current pulses having a low “on”duty cycle of the order of 0.1 microsecond and a frequency of occurrence of the order of one current pulse per minute to periodically energize the variable resistor of said sending unit to produce a fuel level output, whereby the electrochemical action on the sending unit is minimized; and means responsive to the sending unit output and coupled to the display unit for generating a display drive signal.