CN101072153A

CN101072153A - CAN bus type automobile anti-theft alarm method and its device

Info

Publication number: CN101072153A
Application number: CNA2007100557693A
Authority: CN
Inventors: 白玉民; 拱印生; 尹诚; 边增远; 郝艳涛
Original assignee: QIMING INFORMATION TECHNOLOGY Co Ltd
Current assignee: QIMING INFORMATION TECHNOLOGY Co Ltd
Priority date: 2007-06-15
Filing date: 2007-06-15
Publication date: 2007-11-14

Abstract

Signal chip computer (SCC) as control core through CAN bus driver collects information of locking vehicle, unlocking and information of vehicle door. After vehicle is locked, SCC monitors alarm signal sent from bugging sensor and drives the alarm horn to alarm. When data corresponding to vehicle being locked occurs on CAN bus, SCC switches to detect the output signal from sensor for tilt angle. When sensor is triggered to output signal, SCC carries out process of recognition and algorithm. If sensed signal is true, then SCC drives operation of alarm. When data corresponding to vehicle being unlocked occurs on CAN bus, SCC drives the alarm to generate sound prompt. The invention makes vehicle in CAN bus type install vehicle burglar alarm compactly. Features are: reasonable structure, small size, high reliability, vary low rate of false alarm, high practicability, especially application of sensor for tilt angle.

Description

CAN bus type automobile anti-theft alarm method and device thereof

Technical field:

The invention provides a kind of CAN bus type automobile anti-theft alarm method, also disclose its warning device simultaneously, can be applicable to various CAN bus type automobiles, belong to the automobile anti-theft alarm technical field.

Background technology:

At present, the CAN bussing technique has been widely used on most of automobiles, owing to be to connect by bus mode between each parts on the car, does not provide conventional alarm needed various electrical apparatus interfaces, so the CAN bus type automobile can't be installed car alarm.Existing alarm is by gathering and control car door lock and engine start level are realized, and the centrally controrlled locking system module of CAN bus type automobile has only the bus data interface, so it is very big that conventional alarm difficulty is installed, the situation that causes a large amount of CAN bus type automobiles to be in the antitheft means of no technology is used.

Summary of the invention:

The invention discloses a kind of CAN bus type automobile anti-theft alarm method, can satisfy the application of various CAN bus type automobiles, solve the problem that existing C AN bus type automobile could not use and install alarm.

The present invention also provides CAN bus type automobile anti-theft alarm device, can satisfy the application of the antitheft aspect of all kinds of CAN bus type automobiles fully.

CAN bus type automobile anti-theft alarm method of the present invention is: be the control core with the monolithic computer, gather lock car, release, vehicle door status information on the former car CAN bus by the CAN bus driver, simultaneously the warning message that monolithic computer monitoring burglar alarm transducer is sent behind the lock car, drive alarming horn and send high loudness alarm sound.

The structure of burglar alarm of the present invention is as follows:

Constitute overall structure by bus driver, monolithic computer, sensor for tilt angle, alarm, power supply, the data/address bus of monolithic computer is connected with the CAN bus by TXD, the RXD port of bus driver, detect valid data on the CAN bus constantly by bus driver, sensor for tilt angle and other alarm sensor be the data/address bus of order sheet computer respectively, and power supply provides power supply through translation circuit for computer;

Described bus driver comprises by the transmitting-receiving two large divisions and forming that its CANH is connected with the CAN bus with the CANL end; During accepting state, obtain data on the CAN bus, the differential input terminal by receiver forms differential input signal, sends into push-pull output circuit that the MOS triode forms to the RXD port, and the monolithic computer that connects the back as the signal of Transistor-Transistor Logic level is handled; During transmit status, the data-signal that the TXD end is sent monolithic computer is at first given master timer, constantly judged whether that overtime data occur, produce time sequential pulse through timing sequencer then and give output driver, time sequential pulse is carried out power amplification, promote P-MOS and N-MOS triode power output signal, on the CAN bus, produce data, as bus acknowledge information.

Temperature protection circuit is used for the working temperature of testing circuit, is connected with master timer and the input that connects timing sequencer, when occurring that operating voltage raises and during bus short circuit, cuts off and being connected of bus, until recovery normally.

The MODE end of bus driver is connected with VCC or GND, carrying out model selection selects, circuit working is only being received and reiving/transmitting state, be fast mode and individual event pattern, data can be read and send to the work of circuit global function, during silent mode during fast mode on bus, circuit sends and is under an embargo, can only reading of data.

When occurring the corresponding data of lock car on the CAN bus, monolithic computer transfers the output signal that detects sensor for tilt angle to, when inductor has been triggered output signal, monolithic computer is discerned and algorithm process immediately, to true induced signal, drive alarm work, produce alarm sound.When the data of release occurring on the CAN bus, monolithic computer drives alarm and produces the sound equipment prompting.

Power converting circuit is that the DC power supply that alarm host machine provides is carried out voltage stabilizing and filter processing unit, and other detector is the spare interface that is used for expanding the warning inductor, can be Infrared Detectors, boot inductor, door handle switch etc.

The invention has the beneficial effects as follows, can make the succinct installation car alarm of CAN bus type automobile standard, it is not compromised.Application of sensor for tilt angle makes that it is rational in infrastructure, it is simple to install, volume is small and exquisite, reliability is very high, and rate of false alarm is extremely low, and practicality improves greatly.

Description of drawings:

Fig. 1 is a circuit catenation principle block diagram of the present invention.

Fig. 2 is the circuit theory diagrams of bus driver of the present invention.

Embodiment

Embodiment 1

According to Fig. 1, constitute overall structure by bus driver, monolithic computer, sensor for tilt angle, alarm, power supply, the TXD of bus driver, RXD port with the data CAN bus of monolithic computer be connected, detect the valid data on the CAN bus, sensor for tilt angle and other alarm sensor be the data/address bus of order sheet computer respectively, and power supply provides power supply through translation circuit for computer.

The present invention is integrated in monolithic computer, bus driver, power converting circuit in the shielding box (being called main frame), during use, at first connect sensor for tilt angle (or other detector) and alarm signal input part to the monolithic computer of main frame, the negative pole, the positive pole that connect power supply then, H and the L that the bus CANH and the CANL of bus driver connect vehicle body CAN bus again, system promptly enters operate as normal.

Embodiment 2

As shown in Figure 2, bus driver by receiver (differential amplifier), receive driver, timer, timing sequencer, output driver, push-pull follower (P, N), temperature protection circuit when main.

The CANH of bus driver is connected with the CAN bus with the CANL end, when accepting state, on the CAN bus, obtain data, differential input terminal by receiver J forms differential input signal, send into and receive driver (push-pull output circuit that the MOS triode is formed), handle for the monolithic computer of back as the signal of Transistor-Transistor Logic level to the RXD port; During transmit status, TXD end is sent computer to such an extent that the data-signal sent here is at first given timer when main, constantly judged whether that overtime data occur, produce time sequential pulse through timing sequencer then and time sequential pulse is carried out power amplification to output driver, connect push-pull oscillator, be made of P-MOS (IPF9630) and N-MOS (IRF350) triode, the signal of recommending output produces data as bus acknowledge information to the CAN bus.

The VCC termination vehicle body positive source of CAN bus driver, GND connects vehicle body power cathode (ground strap), and TXD and RXD are connected to the control protocol port RXD and the TXD of monolithic computer, are used for carrying out data communication with monolithic computer; The MODE end of bus driver is connected with VCC or GND, carrying out model selection selects, circuit working is only being received and reiving/transmitting state, be fast mode and individual event pattern, data can be read and send to the work of circuit global function, during silent mode during fast mode on bus, circuit sends and is under an embargo, can only reading of data.In order to avoid influence the bus operate as normal.As pin TXD during because of the lasting low level of the mistake of hardware or software; timer work when main; make the transmission that is under an embargo of its transmitter; circuit enters the state that breaks away from bus; guarantee former bus operate as normal, switch on moment that pin CANH and CANL are protected at automobile; promptly do not influence bus, can be by high voltage and reverse voltage punch through damage yet.Temperature inside prison unit has guaranteed that the temperature of transmitter tie point can not transfinite, especially when bus short circuit.

Claims

1, a kind of CAN bus type automobile anti-theft alarm method, it is characterized in that: be the control core with the monolithic computer, gather lock car, release, vehicle door status information on the former car CAN bus by the CAN bus driver, simultaneously the warning message that monolithic computer monitoring burglar alarm transducer is sent behind the lock car, drive alarming horn and send high loudness alarm sound;

The MODE end of bus driver is connected with VCC or GND, carrying out model selection selects, circuit working is only being received and reiving/transmitting state, be fast mode and individual event pattern, data can be read and send to the work of circuit global function, during silent mode during fast mode on bus, circuit sends and to be under an embargo, can only reading of data; When occurring the corresponding data of lock car on the CAN bus, monolithic computer transfers the output signal that detects sensor for tilt angle to, when inductor has been triggered output signal, monolithic computer is discerned and algorithm process immediately, to true induced signal, drive alarm work, produce alarm sound; When the data of release occurring on the CAN bus, monolithic computer drives alarm and produces the sound equipment prompting.

2, the warning device of making according to the described method of claim 1, it is characterized in that: constitute overall structure by bus driver, monolithic computer, sensor for tilt angle, alarm, power supply, the data/address bus of monolithic computer is connected with the CAN bus by TXD, the RXD port of bus driver, detect valid data on the CAN bus constantly by bus driver, sensor for tilt angle and other alarm sensor be the data/address bus of order sheet computer respectively, and power supply provides power supply through translation circuit for computer;

Described bus driver comprises by the transmitting-receiving two large divisions and forming, its CANH is connected with the CAN bus with the CANL end, during accepting state, on the CAN bus, obtain data, differential input terminal by receiver forms differential input signal, the push-pull output circuit of sending into MOS triode composition handles for the monolithic computer of back to the RXD port as the signal of Transistor-Transistor Logic level; During transmit status, the data-signal that the TXD end is sent computer is at first given the TXD overtime timer, constantly judged whether that overtime data occur, produce time sequential pulse through timing sequencer then and give output driver, time sequential pulse is carried out power amplification, promote P-MOS and N-MOS triode power output signal, on the CAN bus, produce data, as bus acknowledge information; The MODE end of bus driver is connected with VCC or GND, carries out model selection and selects.

3, warning device according to claim 2; it is characterized in that: the temperature protection circuit of testing circuit is connected with the input of timing sequencer with overtime timer and after connecting; when operating voltage rising and bus short circuit occurring, cut-out is connected with bus, until recovering normal.