Vehicle-mounted intelligent glass breakage anti-theft alarm device and control method thereof

Abstract

The invention discloses a vehicle-mounted intelligent glass breakage anti-theft alarm device and a control method thereof. The on-off state of a vehicle engine is judged through an OBDII interface or service voltage. If the engine is turned off, a glass breakage detector is started. If the engine is turned on, the glass breakage detector is not started, so that false alarming caused by sounds of a radio and the like is avoided. When glass is smashed by a robber, sounds of special frequency can be generated. By means of a simple DSP / CPU, the glass breakage detector detects and analyzes sounds of glass breakage frequency by collecting peripheral sounds through an MIC and converting the peripheral sounds into digital signals through A / D. If the frequency range is within the glass breakage sound frequency band, a buzzer is started, or an alarm is given in a wireless communication manner. The state of the vehicle engine can be obtained more precisely, and anti-theft monitoring is carried out more precisely and sensitively according to the state of the engine.

Description

technical field [0001] The invention relates to the field of vehicle-mounted anti-theft devices and methods, in particular to a vehicle-mounted smart glass broken anti-theft alarm device and a control method thereof. Background technique [0002] At present, the switch state of the car engine can be obtained in the following two ways, one is obtained through the OBDII interface, where OBD is an on-board diagnostic system, and the other is detected through the change of the power supply voltage of OBDII. Obtaining the engine switch state through the OBDII port can accurately obtain the engine switch, in other words, no misjudgment. However, not all cars can get the engine switch information from the OBDII port. Moreover, due to the different definitions of each manufacturer, the pin name of whether the state of the engine switch can be obtained from the OBDII interface may also be different. Although the method of voltage detection is simple, it may cause false detection. ...

AI Technical Summary

Problems solved by technology

However, not all cars can get the engine switch information from the OBDII port

Moreover, due to the different definitions of each manufacturer, the pin name of whether the state of the engine switch can be obtained from the OBDII interface may also be different.

Although the method of voltage detection is simple, it may cause false detection

Images