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Oil level sensing device

A technology for oil level sensing and oil quantity, applied in the field of sensors, can solve problems such as poor accuracy, and achieve the effects of simple structure, less maintenance, and strong casing structure

Inactive Publication Date: 2013-09-25
CHENGDU CONETON SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the problems of poor accuracy of traditional sensors by setting an oil level sensing device, and achieves the purpose of accurately detecting the oil level

Method used

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  • Oil level sensing device
  • Oil level sensing device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Such as figure 1 As shown, this embodiment includes a casing 3, a sensing electrode 2, a capacitance conversion circuit 1, and an oil level indicator. The sensing electrode 2 and the capacitance conversion circuit 1 are placed in the casing 3. It is connected with the housing 3 , and the oil quantity indicator is connected with the capacitance conversion circuit 1 . The shell 3 and the sensing electrode 2 form a coaxial container. When the shell 3 forms the container, when the oil starts to contact the container, the capacitance between the shell 3 and the sensing electrode 2 will change, and this change will pass through the capacitance conversion circuit. 1 conversion, output 4 ~ 20mA standard signal for fuel quantity display. When the car encounters a relatively complicated and rugged terrain while driving, the oil level in the fuel tank 4 will shake violently, and the impact force formed by it will cause certain damage to the sensing device; and the closed casing 3...

Embodiment 2

[0022] Such as figure 1 As shown, this embodiment is based on Embodiment 1. The capacitance conversion circuit 1 includes a CAV424 chip and an AM402 chip. The CAV424 chip is connected to the sensing electrode 2 and the housing 3 respectively. connected. After the oil enters the fuel tank 4, the capacitance change between the sensing electrode 2 and the casing 3 passes through the CAV424 chip, and the CAV424 chip converts the capacitance signal into an electrical signal and transmits it to the AM402 chip, and the AM402 chip performs voltage-current conversion, and finally outputs 4 ~20mA standard signal supply oil quantity indicator

Embodiment 3

[0024] Such as figure 1 As shown, on the basis of Embodiment 1, the present embodiment is further provided with an O-shaped rubber ring at the bottom of the housing 3 , and a shock absorber is also provided inside the housing 3 . The O-shaped rubber ring can be directly placed on the root of the housing 3, which can buffer the force between the sensing device and the fuel tank 4 when the vehicle is running, so as to ensure the normal operation of the sensing device; The shock absorber prevents the oil level in the fuel tank 4 from violently shaking and impacting the sensing device so as to cause damage to the sensing device when the automobile is bumped violently on a special road type or in a location.

[0025] Preferably, the length of the casing 3 is 0.01-1 m. The length of the housing 3 is adapted to the volume height of the fuel tank 4, and the housing 3 with various lengths is applicable to various types of vehicles and has high practicability.

[0026] Preferably, the...

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Abstract

The invention discloses an oil level sensing device which comprises a shell, an induction electrode, a capacitance converting circuit and an oil capacity display. The induction electrode and the capacitance converting circuit are disposed in the shell. The capacitance converting circuit is connected with the induction electrode and the shell respectively. The oil capacity display is connected with the capacitance converting circuit. The shell and the induction electrode form a coaxial container. When oil starts to contact with the container, capacitance variation between the shell and the induction electrode is caused, variation quantity is converted through the capacitance converting circuit into standard signals of 4-20mA to be sent to the oil capacity display. When complex and rugged landforms are encountered during driving of a vehicle, oil level in an oil tank shakes fiercely, and impact force generated by shaking causes certain damages to the sensing device; due to a simple structure, none of movable or elastic element components are provided, so that reliability is high and maintaining workload is few.

Description

technical field [0001] The invention relates to a sensor, in particular to an oil level sensing device. Background technique [0002] The traditional automotive sensor is a sliding rheostat. The resistance value is controlled by a float. As the oil level changes, the resistance value also changes. Under the condition of fixed loading voltage, the output current changes, and the current value is reflected on the car instrument, and the oil level is converted according to a certain ratio. This kind of oil level sensor has been used for hundreds of years since the invention of automobiles. With the development of electronics, intelligence, and networking of automobiles, the disadvantages of traditional oil level sensors are becoming more and more obvious, such as poor accuracy and damage rate. High, poor linearity, and difficulty in docking with the vehicle's smart electronic equipment have failed to keep up with the current pace of vehicle performance improvement; the tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/26
Inventor 陈晓琦
Owner CHENGDU CONETON SCI & TECH