Electronic oil level sensor and control method thereof

Abstract

The invention discloses an electronic oil level sensor and a control method thereof. The electronic oil level sensor is characterized in that: the output end of the sensor is provided with an analog resistance output circuit, and an output signal of the analog resistance output circuit is an analog resistance value R; the input end of the analog resistance output circuit is connected with a processor; the input end of the processor is connected with an induction signal acquisition module; the induction signal acquisition module generates an induction signal according to an oil level; the processor generates a corresponding control signal according to the induction signal; and the analog resistance output circuit outputs a corresponding analog resistance value R according to the control signal. In the control method, the analog resistance value R is determined by acquiring voltage of a collector and an emitter of a triode, and the R is changed by regulating the duty ratio of a pulse width modulation (PWM) signal. The invention has the advantages that: the circuit is simple in structure and convenient to control, the analog resistance signal is directly output, the invention is compatible with the traditional resistance scheme, the electronic oil level sensor can directly replace the traditional sliding varistor sensor, the smooth transition of an oil level detection system is realized, and the system upgrade cost is reduced.

Description

technical field [0001] The invention relates to sensor technology, in particular to an electronic oil level sensor and a control method thereof, belonging to the field of electronic technology. Background technique [0002] With the development of electronic technology and the improvement of automation, sensor technology has been applied in more and more fields. Its main function is to convert various physical characteristics into electrical characteristics, so as to realize the automatic detection of various parameters. [0003] At present, the oil level sensors used in automobiles are often in the form of sliding rheostats, and their output signals are resistances. Its disadvantages are: long-term mechanical sliding, the strain capacity of the scribing sheet will be reduced, which will easily lead to loose contact between the scribing sheet and the resistance wire, and even vulcanization and oxidation, which will eventually lead to inaccurate oil level detection. [0004]...

AI Technical Summary

Problems solved by technology

Its disadvantages are: long-term mechanical sliding, the strain capacity of the scribing sheet will become lower, which will easily lead to loose contact between the scribing sheet and the resistance wire, and even vulcanization and oxidation, which will eventually lead to inaccurate oil level detection

[0004] In order to improve the above shortcomings, some people have proposed the idea of ​​electronic sensors, and the signals output by ordinary electronic sensors are often in the form of voltage, current or frequency, so that they cannot be well matched with traditional resistance solutions, and there are problems with system compatibility.

Images