CN101973244B - Automobile anti-theft system based on double central processing units - Google Patents

Abstract

The invention discloses an automobile anti-theft system based on dual central processing units, which includes a keyless entry system, a remote controller and a starting system, and the starting system includes a first central processing unit, an oil-electric control module and a starting circuit, and is characterized in that: Including a radio frequency identification system and a chip key fob; the starting system also includes a second central processing unit, and the radio frequency identification system is electrically connected to the second central processing unit; usually, the radio frequency identification system is in a dormant zero-power working state. When the remote control cannot control the unlocking of the diesel-electric control module, the chip keychain is in close contact with the radio frequency identification system to wake up the second central processing unit, and the second central processing unit controls the unlocking of the diesel-electric control module. The present invention can greatly reduce power consumption and error probability, and the first central processing unit can work without failure for a long time; even in extreme situations such as failure of the first central processing unit or damage to the remote control, emergency response can also be achieved through the chip keychain and the radio frequency identification system start up.

Description

Automobile anti-theft system based on double CPU

technical field

The invention relates to the field of automobile anti-theft device production, in particular to an automobile anti-theft system based on dual central processing units.

Background technique

Radio Frequency Identification RFID (Radio Frequency Identification) is a non-contact automatic identification technology, which automatically identifies the target object and obtains relevant data through radio frequency signals. RFID technology can identify high-speed moving objects and identify multiple tags at the same time, and the operation is fast and convenient . RFID is a simple wireless system with only two basic components, which is used to control, detect and track objects. The system consists of an interrogator (or reader) and many transponders (or tags). According to different application frequencies, it is divided into low frequency (LF), high frequency (HF), ultra high frequency (UHF), and microwave (MW). The corresponding representative frequencies are: low frequency below 135KHz, high frequency 13.56MHz, ultra high frequency Frequency 860M～960MHz, microwave 2.4G, 5.8G.

At present, the one-key start car anti-theft device in the market is composed of keyless entry (PKE) system + start system. PKE is the abbreviation of (PASSIVE KEYLESS ENTER). Access control, some of these systems also include the ability to remotely start the car and find the car. This type of anti-theft device has some shortcomings: the current keyless entry (PKE) system sends out a 66-digit full code for a long time to find the remote control information code, which is a heavy task and has a high probability of error. About half of the products on the market fail to automatically unlock the door during the application. In addition, the power consumption of the remote control is also large, and the battery of the remote control is easy to lose power too quickly, resulting in communication failure and unable to start the car.

Contents of the invention

The object of the present invention is to provide a kind of car anti-theft system based on dual central processing unit aiming at the deficiencies in the prior art.

Technical scheme of the present invention is as follows:

An automobile anti-theft system based on dual central processing units, including a keyless entry system, a remote controller and a starting system. The starting system includes a first central processing unit, a gasoline-electric control module and a starting circuit. The gasoline-electric control module is electrically connected to the starting circuit. The keyless entry system is electrically connected with the first central processing unit; when the remote control enters the identification range of the keyless entry system, the keyless entry system verifies the legitimacy of the remote control and controls the oil-electric control module to unlock through the first central processing unit ; It is characterized in that: it also includes a radio frequency identification system and a chip key chain; the starting system also includes a second central processing unit, and the radio frequency identification system is electrically connected to the second central processing unit; usually, the radio frequency identification system is in a dormant zero power consumption In the working state, when the legal remote control cannot control the unlocking of the diesel-electric control module, the chip keychain is in close contact with the radio frequency identification system to wake up the second central processing unit, and the second central processing unit controls the unlocking of the diesel-electric control module .

Further, the working frequency of the RFID system is 125KHz.

Furthermore, when the car is turned off, the keyless entry system continuously sends 125KHz 8-digit information codes to find the remote control four times per second, if the keyless entry system does not receive a legal remote control within 1 second The high-frequency 433MHz 66-bit information code sent out locks the gasoline-electric control module through the first central processing unit; when the remote control is within a recognizable distance, after the remote control receives the 8-bit information code sent by the keyless entry system, After verification, the 66-bit information code is sent back to the keyless entry system through the high frequency 433MHz. After the keyless entry system verifies the legitimacy of the remote control, it controls the oil-electric control module to unlock through the first central processing unit. The keyless entry system will continuously send 125KHz 8-digit remote control information codes four times per second to the surroundings, which can greatly reduce power consumption and error probability.

Further, the car anti-theft device system starts the control method of the car in the fortified state as follows:

(1) Remote control detection: If the keyless entry system detects a legal remote control, the car anti-theft device system will be disarmed, the car will unlock the door and enter step (2); otherwise, it will detect whether the door of the car is opened, if the door is opened , then enter step (3), otherwise return to step (1) and perform remote control detection again;

(2) If the first central processing unit is normal, the first central processing unit controls the oil-electric control module to unlock, and enters step (4), otherwise enters the next step;

(3) The light of the start button of the car flashes and gives an alarm. At this time, the chip key fob is placed close to the start button, and the radio frequency identification system recognizes the legal chip key fob and wakes up the second central processing unit, which controls the oil and electricity Unlock the control module and go to the next step;

(4) The light of the start button of the car is always on. At this time, short press the start button to start the car.

During the use of the car anti-theft system, when the car is started, if the remote control is taken about 2 meters away from the car and exceeds the recognition range, the car will emit an anti-theft alarm.

Compared with prior art, the present invention has following advantage:

The existing keyless entry system sends a 66-bit full code for a long time to find the information code of the remote control. Because the remote control is damaged or lost, or the battery loses power too quickly due to the high power consumption of the remote control, the high-frequency detection fails and the car cannot be started. The invented keyless entry system will continuously send 125KHz 8-digit remote control information code four times per second to the surroundings, so it can greatly reduce power consumption and error probability, and the first central processing unit can work without failure for a long time; In extreme situations such as failure of the first central processing unit or damage to the remote control, it can also be activated in an emergency through the chip key fob and the radio frequency identification system.

Description of drawings

Fig. 1 is the structural diagram of the car anti-theft system based on dual CPUs.

Fig. 2 is the flow chart of starting the car under the fortified state of the car anti-theft system based on dual central processing units.

Detailed ways

As shown in Figure 1, the car anti-theft system based on dual central processing units includes a keyless entry system, a remote controller and a starting system. The starting system includes a first central processing unit, a fuel-electric control module and a starting circuit. The first central processing unit The controller is electrically connected to the diesel-electric control module, the diesel-electric control module is electrically connected to the starting circuit, and the keyless entry system is electrically connected to the first central processing unit; when the remote controller enters the identification range of the keyless entry system, the keyless entry system After verifying the legitimacy of the remote controller, the first central processing unit controls the oil-electric control module to unlock, thereby connecting the starting circuit; it also includes a radio frequency identification system and a chip key chain; the starting system also includes a first electric connection with the oil-electric control module. Two central processors; the radio frequency identification system is electrically connected to the second central processor; usually, the radio frequency identification system is in a dormant zero-power working state, and when the keyless entry system cannot normally control the oil-electric control module to unlock, Then, the chip keychain is in close contact with the radio frequency identification system to wake up the second central processing unit, and the second central processing unit controls the gasoline-electric control module to unlock, thereby turning on the starting circuit.

When the car is started, if the remote controller is taken about 2 meters away from the car, that is, beyond the recognition range of the keyless entry system, the car will sound an anti-theft alarm.

If the car is started by the chip key fob, after starting the car, the first central processing unit will be reset. After the first central processing unit is reset to normal, the second central processing unit will re-enter the dormant zero-power consumption working state.

The working frequency of the RFID system is 125KHz.

As shown in Figure 1, usually the keyless entry system will continuously send an 8-digit 125KHz information code to find the remote control four times a second to the surroundings. When the remote control is within the recognizable range, the remote control will receive the keyless entry system After sending out the 8-digit information code used to find the remote control, the 66-digit information code will be sent back through the high-frequency 433MHz immediately after verification. After the keyless entry system receives and verifies it, the car anti-theft system will be disarmed, and an instruction will be sent to the start system. Start the circuit, which will greatly reduce power consumption and error probability.

As shown in Figure 2, the control method of the car anti-theft device system starting the car in the fortified state is as follows:

(1) Remote control detection: If the keyless entry system detects a legal remote control, the car anti-theft device system will be disarmed, the car will unlock the door and enter step (2); otherwise, it will detect whether the door of the car is opened, if the door is opened , then enter step (3), otherwise return to step (1) and perform remote control detection again;

(2) If the first central processing unit is normal, the first central processing unit controls the oil-electric control module to unlock, and enters step (4), otherwise enters the next step;

(3) The light of the start button of the car flashes and gives an alarm. At this time, the chip key fob is placed close to the start button, and the radio frequency identification system recognizes the legal chip key fob and wakes up the second central processing unit, which controls the oil and electricity Unlock the control module and go to the next step;

(4) The light of the start button of the car is always on. At this time, short press the start button to start the car.

Claims (1)

1. based on the automotive theft proof system of two central process units; Comprise keyless entry, remote controller and start-up system; Start-up system comprises first central process unit, oily electric control module and start-up circuit; The oil electric control module is electrically connected with start-up circuit, and keyless entry is electrically connected with first central process unit; When remote controller enters into the identification range of keyless entry, control oily electric control module through first central process unit after the legitimacy of keyless entry checking remote controller and unlock; Also comprise radio-frequency recognition system and chip key ring; Start-up system also comprises second central process unit, and radio-frequency recognition system is electrically connected with second central process unit; Generally; Radio-frequency recognition system is in the zero-power mode of operation of dormancy; When legal remote controller can not be controlled oily electric control module and unlocks; Through chip key ring and radio-frequency recognition system close contact, wake second central process unit up, control oily electric control module by second central process unit and unlock; The frequency of operation of radio-frequency recognition system is 125KHz; Behind automobile flameout; Keyless entry constantly sends 8 information codes that are used to seek remote controller of 1 second 4 125KHz towards periphery; Keyless entry if do not receive 66 information codes of the high frequency 433MHz that legal remote controller sends, then locks oily electric control module through first central process unit in 1 second; In remote controller is in discernible distance; After remote controller receives 8 information codes that keyless entry sends; The checking back is beamed back 66 information codes through high frequency 433MHz and is given keyless entry; Control oily electric control module through first central process unit after the legitimacy of keyless entry checking remote controller and unlock, it is characterized in that: the control method of car alarm system startup automobile under the state of setting up defences is following:

(1) remote controller detects: if keyless entry detects legal remote controller, the car alarm system is withdrawn a garrison, the automobile door opening lock gets into step (2); Otherwise whether the door that detects automobile is opened, if door is opened, then gets into step (3), carries out the remote controller detection once more otherwise return step (1);

(2) if first central process unit is normal, then controls oily electric control module and unlock, get into step (4), otherwise get into next step by first central process unit;

(3) flicker of the start key lamp of automobile and warning; Press close to start key with the chip key ring this moment; Then radio-frequency recognition system wakes second central process unit up after recognizing legal chip key ring, controls oily electric control module by second central process unit and unlocks, and enters into next step;

(4) the start key lamp Chang Liang of automobile, this moment, weak point was pressed start key, can start automobile.

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