초록 ▼

An electrostatic type fuel measuring device comprises a pair of oppositely arranged electrodes separated by insulating spacers immersed in liquid fuel in a tank so that a variation of the electrostatic capacity between the electrodes due to a variation in the liquid fuel level is detected electrical

An electrostatic type fuel measuring device comprises a pair of oppositely arranged electrodes separated by insulating spacers immersed in liquid fuel in a tank so that a variation of the electrostatic capacity between the electrodes due to a variation in the liquid fuel level is detected electrically and the fuel amount is measured and indicated.

대표청구항 ▼

A method for measuring the amount of liquid fuel in a fuel tank with a device which includes a pair of measuring electrodes arranged relative each other to provide an electrostatic capacity therebetween which is related to the area of the measuring electrodes immersed in the tank and the height of f

A method for measuring the amount of liquid fuel in a fuel tank with a device which includes a pair of measuring electrodes arranged relative each other to provide an electrostatic capacity therebetween which is related to the area of the measuring electrodes immersed in the tank and the height of fuel in the tank and thus representative of the amount of fuel in the tank; and at least a pair of spaced reference electrodes mounted in insulating means for maintaining said reference electrodes spaced ralative to said measuring electrodes in the fuel tank so that said reference electrodes are always wholly immersed in the fuel in the fuel tank, said reference electrodes being arranged relative to each other to provide an electrostatic capacity therebetween which is representative of the specific dielectric constant of the fuel, the method comprising the steps of: sensing the electrostatic capacity between the reference electrodes immersed in the fuel; sensing the electrostatic capacity between the measuring electrodes as a function of the surface area of the measuring electrodes, the specific dielectric constant of the air above the fuel level and the specific dielectric constant of the fuel; and providing a pulsed output signal from an astable multivibrator which said signal has a first component representative of the sensed electrostatic capacity of said measuring electrodes and a second component representative of the sensed electrostatic capacity of said reference electrodes, whereby the frequency of the pulsed output signal is respectively determined as a representative of the electrical capacity of both said measuring electrode and said reference electrodes.