Vehicle intrusion detection system and vehicle intrusion detection method

1. A vehicle intrusion detection system which is mounted on a vehicle and detects intrusion within the vehicle, comprising:

a first sensor unit which detects light or a signal reflected by an object, generates a first detection signal, and outputs the generated first detection signal;

a control unit which controls an operation of the first sensor unit and receives the first detection signal from the first sensor unit; and

a second sensor unit which detects a rotation or inclination of the vehicle or an impact against the vehicle, generates a second detection signal, and inputs the generated second detection signal to the control unit,

wherein the control unit detects intrusion within the vehicle or determines whether there is an external simple impact based on the first detection signal filtered based on the second detection signal.

2. The vehicle intrusion detection system of claim 1 , wherein the first sensor unit comprises:

a transmitter which outputs light or a signal of a specific cycle;

a receiver which receives light or a signal reflected by an object;

a signal processing unit which applies a transmitting signal to the transmitter in response to a signal processing control signal of the control unit; and

a signal analysis unit which analyzes a signal received through the receiver.

3. The vehicle intrusion detection system of claim 2 , wherein:

the first sensor unit comprises an ultrasonic sensor equipped with the transmitter and the receiver, and

the second sensor unit comprises a gyro sensor or an impact sensor.

4. The vehicle intrusion detection system of claim 2 , wherein:

the control unit detects vehicle intrusion based on the first detection signal by determining vehicle intrusion based on the first detection signal received through the first sensor unit and then determining whether the second detection signal from the second sensor unit is a specific level or more for a specific time, and

if vehicle intrusion is detected based on the first detection signal, the control unit increases a transmitting level of the transmitter higher than a previous transmitting level of the transmitter when the intrusion is detected and investigates vehicle intrusion again.

5. The vehicle intrusion detection system of claim 4 , wherein the control unit detects intrusion within the vehicle or an external simple impact based on at least one of an intensity of a signal and a change of a waveform in a voltage-time table indicating that the first detection signal sampled at a preset sampling time interval from the first sensor unit belongs to which voltage range, if an integer value of a specific level or more is within a range of a preset reference value in second pattern data within a table in which sampling data for a change of an angle sampled in plural times at specific intervals for a specific time from the second sensor unit are averaged and the averaged values are classified into specific steps.

6. The vehicle intrusion detection system of claim 1 , wherein:

the first sensor unit and the second sensor unit are mounted on a single module, and

the single module is mounted on an overhead console of the vehicle.

7. A vehicle intrusion detection method of detecting vehicle intrusion in a vehicle intrusion detection system comprising a first sensor unit which detects light or a signal reflected by an object, generates a first detection signal, and outputs the generated first detection signal, a control unit which controls an operation of the first sensor unit and receives the first detection signal from the first sensor unit, and a second sensor unit which detects a rotation or inclination of the vehicle or an impact against the vehicle, generates a second detection signal, and inputs the generated second detection signal to the control unit, the vehicle intrusion detection method comprising:

a first step of detecting vehicle intrusion based on the first detection signal by detecting vehicle intrusion based on the first detection signal received through the first sensor unit and then determining whether the second detection signal from the second sensor unit is a specific level or more for a specific time;

a second step of when the vehicle intrusion is detected based on the first detection signal increasing a transmitting level of a transmitter of the first sensor unit higher than a transmitting detected level when the intrusion is in the first step and investigating vehicle intrusion again; and

a third step of if the vehicle intrusion is detected for a specific tilt or more in the second step, detecting intrusion within the vehicle or determining whether there is an external simple impact based on the first detection signal filtered based on the second detection signal.

8. The vehicle intrusion detection method of claim 7 , wherein:

the first pattern data comprises a voltage-time table indicating that the first detection signal sampled at a preset sampling time interval from the first sensor unit belongs to which voltage range,

the second pattern data comprises a table in which sampling data for a change of an angle sampled in plural times at specific intervals for a specific time from the second sensor unit are averaged and the averaged values are classified into specific steps, and

the third step comprises detecting intrusion within the vehicle or an external simple impact based on at least one of an intensity of a signal and a change of a waveform in the voltage-time table if an integer value of a specific level or more in second pattern data within the table is within a range of a preset reference value.