关键词: 燃油防盗；报警器；油量传感器；燃油损失

Abstract: In order to avoid the theft of automobile fuel, an automobile fuel anti-theft alarm device is designed in this paper. This paper introduces the overall design, circuit design, functional design and functional test of the device in detail. The fuel anti-theft alarm has small volume and simple layout, and can be installed on the switch panel of the dashboard in the cab. The controller circuit can be divided into power supply circuit, signal input and output circuit, control circuit and alarm circuit according to its function. The alarm works when the tram stops under the key. When the fuel volume signal of the fuel tank is lost and the fuel volume of the fuel tank drops abnormally, the built-in buzzer and car horn can be driven respectively for audible alarm. After the anti-theft alarm is matched on the whole vehicle, the static current and alarm function test shall be carried out to ensure that the alarm will not adversely affect the circuit of the whole vehicle and that the alarm works normally. The device can automatically set up defense when the commercial vehicle stops for long-distance transportation, and send out an alarm when someone steals fuel. On the one hand, it reminds the driver to pay attention, on the other hand, it scares away the thief, so as to reduce the loss caused by vehicle fuel theft and reduce the driving burden of vehicle owners.

Key words: Fuel theft prevention; Burglar alarm; Oil quantity sensor; Fuel loss