CN201114144Y

CN201114144Y - CAN bus type anti-theft alarm device for automobile

Info

Publication number: CN201114144Y
Application number: CNU2007200939392U
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: 2007-06-20
Filing date: 2007-06-20
Publication date: 2008-09-10
Anticipated expiration: 2017-06-20

Abstract

The utility model discloses a CAN bus type automobile burglar alarm device, which has an integral structure consisting of a bus driver, a singlechip, an inclination angle sensor, an alarm device and a power supply. A data bus of the singlechip is connected with a CAN bus via a TXD port and a RXD port of the bus driver. The inclination angle sensor and other alarm sensors are connected with the data bus of the singlechip respectively. The MODE end of the bus driver is connected with VCC or GND, and the CANH end and the CANL end of the bus driver are connected with the CAN bus. The CAN bus is connected with a differential input end of a receiver to form differential input signals which are sent to a receiving driver and reach the RXD port. The singlechip is connected with a main timer and a time sequence generator via the TXD end so as to generate timing pulse, and then is connected with an output driver. The amplified timing pulse is connected with a push-pull output amplifier to output power signals. The CAN bus type automobile burglar alarm device is capable of installing the automobile burglar alarm device normatively and simply on a CAN bus type automobile, enabling the automobile not be damaged. The application of the inclination angle sensor ensures that the device is rational in structure, simple in installation, small in volume, high in reliability, low in misinformation rate, and has largely improved practicality.

Description

CAN bus type automobile anti-theft alarm device

Technical field:

The utility model provides a kind of CAN bus type automobile anti-theft alarm device, can be applicable to various CAN bus type automobiles, belongs 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.

The utility model content:

The utility model discloses a kind of CAN bus type automobile anti-theft alarm device, 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 utility model is to 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 the utility model burglar alarm 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 beneficial effects of the utility model are, can make the succinct installation car alarm of CAN bus type automobile standard, and 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 the utility model circuit catenation principle block diagram.

Fig. 2 is the circuit theory diagrams of the utility model bus driver.

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 utility model 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 oscillator (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. CAN bus type automobile anti-theft alarm device, it is characterized in that: constitute overall structure by bus driver, single-chip microcomputer, sensor for tilt angle, alarm, power supply, the data/address bus of single-chip microcomputer is connected with the CAN bus by TXD, the RXD port of bus driver, sensor for tilt angle and other alarm sensor connect the data/address bus of single-chip microcomputer respectively, the MODE end of bus driver is connected with VCC or GND, and power supply provides power supply through translation circuit for single-chip microcomputer;

Described bus driver comprises by the sending and receiving two large divisions and forming, its CANH is connected with the CAN bus with the CANL end, and during accepting state, the differential input terminal of CAN bus and receiver is connected to form differential input signal, send into and receive driver, connect single-chip microcomputer as the signal of Transistor-Transistor Logic level to the RXD port; During transmit status, single-chip microcomputer connects output driver by TXD termination master timer, timing sequencer after producing time sequential pulse, and the time sequential pulse amplification connects push-pull oscillator power output signal, produces data on the CAN bus.