Automobile cooling liquid level detection device
A technology for liquid level detection and vehicle cooling, which is applied to the liquid level indicator for physical variable measurement, etc., can solve problems such as low reliability, and achieve the effect of improving accuracy and reliability and prolonging service life.
Pending Publication Date: 2018-09-04
AEROSPACE HI TECH HLDG GROUP
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Problems solved by technology
[0005] The present invention proposes a liquid level detection device for automobile coolant in order to solve the problem of low reliability of the detection results of the existing liquid level detection device for automobile coolant
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[0025] Embodiment: combine below figure 1 and figure 2 This embodiment will be described in detail.
[0026] The liquid level detection device for automobile coolant described in this embodiment includes a detection circuit, a liquid level sensing unit LT and a liquid level judging unit;
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The invention belongs to the technical field of automobile electronics, discloses an automobile cooling liquid level detection device and solves the problem of low reliability of detection results ofexisting automobile cooling liquid level detection devices. The automobile cooling liquid level detection device is characterized in that when a square wave signal generation unit generates a high-level signal, the high-level signal sequentially passes through a DC/AC conversion unit, a current limiting unit and a forward conductive unit to provide an operating power source for liquid level detection for a liquid level sensing unit LT, and the electrified liquid level sensing unit LT detects the automobile cooling liquid level; when the square wave signal generation unit generates a low-levelsignal, the liquid level sensing unit LT completes liquid level detection, and voltage drop on the liquid level sensing unit LT is released through a series circuit formed by a reverse conductive unit, the current limiting unit and the forward conductive unit; a liquid level judgment unit is used for judging whether the automobile cooling liquid level is normal or not according to signals of a common end of the current limiting unit and the forward conductive unit.
Description
technical field [0001] The invention relates to a liquid level detection device, which belongs to the technical field of automobile electronics. Background technique [0002] In order to ensure that the car engine can run at a normal operating temperature, it is necessary to detect the liquid level of the car coolant in real time, so as to avoid the car engine's water temperature being too high due to the car coolant level being too low, and the car system components being damaged . [0003] The liquid level detection device of existing automobile coolant all adopts liquid level sensor as detection element. The liquid level sensor is approximately equivalent to a resistance device. There is a significant difference in impedance when the liquid level of the automobile coolant is normal or too low. [0004] The liquid level detection device of the existing automobile coolant adopts a detection circuit and a liquid level sensor to work together. Existing detection circuits a...
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IPC IPC(8): G01F23/22
CPCG01F23/22
Inventor 杨忠生邓春云王耀文刘金泽张瞵颖
Owner AEROSPACE HI TECH HLDG GROUP
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