Device for measuring the fuel level in the tank

 

(57) Abstract:

The inventive device includes a measuring capacitor with profiled parallel plates connected through the generator and frequency counter to the indicator. The capacitor is located inside the sealed magnetoresitive tube, which can move is a circular float with permanent magnet interacting through a magnetic field with the ferromagnetic insert mounted on the movable slider established between the capacitor plates, the sides of the slide adjacent to the plates of the capacitor is deposited dielectric and electrically connected the conductive coating and the width of the shaped conductive plates in each horizontal section is directly proportional part of tank volume bounded from above this horizontal section. 2 Il.

The invention relates to a device for measuring liquid level and can be used in the automotive industry to measure the level of fuel in the tank of the car.

The prototype of the invention is a device containing a capacitive sensor connected across the generator and frequency counter to indikatoren due to the large deviation of the dielectric constant of the fuel.

The aim of the invention is to improve the accuracy of measurements and reliability.

This goal is achieved by a device for measuring the fuel level in the tank of a complex profile. The device comprises a capacitive sensor electrodes which is made in the form of a profiled parallel plates arranged vertically in the tank and connected to the generator input, the output of which through the frequency counter is connected to the indicator, and the capacitor is located inside the sealed tube, which can move is a circular float with permanent magnet interacting through a magnetic field with the ferromagnetic insert, fixed slider established between the plates of the measuring capacitor, and on the sides of the slide adjacent to the plates, deposited conductive and dielectric coatings, conductive coatings are interconnected by conductive vias, and the width of the profiled plates each horizontal section is directly proportional part of tank volume bounded from above this horizontal section.

Diagram of the device shown in Fig. 1; Fig. 2 shows the plate condensates contains the measuring capacitor with profiled installed in parallel vertical plates 1 and 2, located inside the sealed magnetoresitive tube 3. Plates 1 and 2 is made, for example, in the form of a printed circuit Board with a dielectric substrate 4 and the conductive areas 5, the width of which in each horizontal section is directly proportional part of tank volume bounded from above this horizontal section. Conductive areas 5 plates connected to the input of the generator 6, the output of which through the counter 7 is connected to the indicator 8. Between the plates 1 and 2 set the slide 9, on the two sides of which are adjacent respectively to the plates 1 and 2, deposited dielectric 10 and 11 conductive coating and the conductive coating is connected between a conductive jumper 12. On slide 9 of the pinned ferromagnetic insert 13. On the external side of the tube 3 comprises an annular float 14 with a possibility of free movement in the tube containing the permanent magnet 15, interacting through a magnetic field with an insert 13. In the tank 16 is fuel.

The device operates as follows.

When changing the fuel level in the tank 16, the float 14 is moved along the tube 3 and drags the slider 9, which moves between the plates 1 and 2 of the capacitor. When this container is directly proportional to the amount of fuel in the tank. In accordance with the magnitude of this capacity is installed, the frequency generator 6, which is measured by the frequency counter 7, and the measurement result in the indications of the quantity of fuel in the tank is displayed on the display 8.

The device is excluded the error due to the lack of data about the temperature and the dielectric constant of the fuel. In addition, virtually eliminating friction between the slider and the capacitor plates, which allows you to more easily move the slider by means of a float with a magnet that reduces static measurement error. In General, increases the accuracy and reliability of the device.

DEVICE FOR MEASURING the FUEL LEVEL IN the TANK containing the capacitive sensor connected to the generator, connected through the frequency indicator, wherein the capacitive sensor is located in a sealed magnetoresitive the tube, which can move is a circular float with a permanent magnet, is arranged to interact with the ferromagnetic insert mounted on the movable slider established between the electrodes of the capacitive sensor, while on the sides of the slide adjacent to the electrode capacitance of the capacitive sensor is made in the form of profiled plates, width in each horizontal section is directly proportional to the part of the tank bounded from above this horizontal section.

 

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