CN101402338B - Automobile key latching controller based on CAN bus and control method thereof - Google Patents
Automobile key latching controller based on CAN bus and control method thereof Download PDFInfo
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- CN101402338B CN101402338B CN2008101758764A CN200810175876A CN101402338B CN 101402338 B CN101402338 B CN 101402338B CN 2008101758764 A CN2008101758764 A CN 2008101758764A CN 200810175876 A CN200810175876 A CN 200810175876A CN 101402338 B CN101402338 B CN 101402338B
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Abstract
The invention discloses an automobile key locking controller based on a CAN bus and a control method thereof. The controller comprises a CAN bus transceiver, a voltage stabilizer, a main control unit and an over-current protection circuit , and the control process comprises the steps that the CAN bus transceiver is connected with the main control unit through CAN terminals to convert bus protocol and send automobile speed signals; and the main control unit receives the automobile speed signals, at the same time acquires status signals of local keys and automobile gear signals, to perform treatment and judgment so as to generate key locking output control commands and output the control commands for the over-current protection circuit so as to control the action of an electromagnetic valve. The controller ensures that a driver only can pull out the key at P gear, meanwhile protects the service life of the key lock-up electromagnetic valve, and has the advantage of simple structure, safety and reliability.
Description
Technical field
The present invention relates to automotive ignition key control technology field and vehicle-mounted bus CAN bus control technology field, particularly relate to a kind of automobile key locking controller and control method based on the CAN bus.
Background technology
At present some is equipped with the automobile of automatic transmission change speed gear box, no matter at any gear, ignition key can both be extracted during parking, and if just do not extract key at the P shelves, have safety hazard when then starting automobile once more.
In addition, though the automobile that has at present also has been equipped with the key lock locking apparatus, as application number is the device that discloses in 03277649.7 the utility model so a kind of, but its mode is too simple, and the adhesive meeting always of key lock-up solenoid valve causes the electromagnetic valve life-span to descend.
Local area control net CAN (Controller Area Network) is a serial communication protocol, and the support of energy actv. has the very distribution of high safety grade and controls in real time.CAN at first by German Bosch company in the exploitation eighties, now carried out normalisation (ISO11898 by International Standardization Organization and other standardization body, SAEJ1939), being of wide application of CAN bus, the multichannel distribution from high-revolving network to low price can use CAN.In Automobile Electronic Industry, use CAN to connect for example power system, bodywork system, comfort system etc., its transfer rate reaches as high as 1Mbps.
Summary of the invention
The present invention improves on original key locking controller basis, has adopted the control policy based on the CAN bus, realizes following function:
1, when not when P shelves and the speed of a motor vehicle are reduced to 4km/h, the adhesive of controller control electromagnetic valve is pulled out with preventing key.
2, when not when P shelves and the speed of a motor vehicle rise to 7km/h, the controller control electromagnetic valve is unclamped, in order to avoid electromagnetic valve adhesive always and reduce its life-span.
3, when at the P shelves, the controller control electromagnetic valve is unclamped.
4, controller makes the time of electromagnetic valve adhesive always surpass 360 minutes, if surpassed 360 minutes, then electromagnetic valve unclamps, with the protection electromagnetic valve life-span.
Concrete technical scheme is as follows:
Automobile key locking controller based on the CAN bus, comprise CAN bus transceiver, voltage stabilizer, main control unit and current foldback circuit, its control process is: the CAN bus transceiver is connected with main control unit by its CAN terminal, carries out the bus protocol conversion, sends vehicle speed signal; Main control unit receives vehicle speed signal, gathers local key status signal and automobile gear signal, handles judgement, produces key locking output control command, the control electromagnetic valve action.
Wherein the key locking output control command of main control unit generation is exported to current foldback circuit, and then the control electromagnetic valve action.
This controller has guaranteed that the driver can only extract key at the P shelves, has protected the life-span of key lock-up solenoid valve simultaneously.
Description of drawings
Fig. 1: based on the structured flowchart of the automobile key locking control system of CAN bus.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is specifically described.
As shown in Figure 1, this controller mainly is made up of CAN bus transceiver 1, voltage stabilizer 2, main control unit 3, current foldback circuit 4.Main control unit 3 adopts the ST72561AR micro controller system; CAN bus transceiver 1 adopts the TJA1040 chip, carries out the reception and the transmission of speed information-CAN message; Voltage stabilizer 2 adopts the L4987C chip, for main control unit provides its required 5V power supply.Current foldback circuit 4 adopts the aerotron overcurrent protection.
CAN transceiver 1 is connected with main control unit by CAN_H, the CAN_L terminal on it; Voltage stabilizer 2 is connected with main control unit by of the voltage output end on it, for it provides 5V power supply, and is connected with main control unit by control terminal, to realize reset function; Automobile gear signal 5 is connected with main control unit 3 by terminal with key status signal 6; Current foldback circuit 4 is connected with main control unit.
Start working behind the 5V power supply that main control unit acquisition voltage stabilizer provides.Main control unit 3 is gathered local key status signal 6 and automobile gear signal 5, and after receiving the vehicle speed signal that CAN transceiver 1 sends, carries out internal judgment, produces key locking output control command, exports to current foldback circuit 4, and then control electromagnetic valve work.
Voltage range on the automobile is generally 9～16V, and voltage stabilizer 2 is a 5V voltage with this voltage transitions, for the work of main control unit 3 provides stabilized power source.It can anti-40V peak voltage, have low voltage, excess temperature detects and the advantage of protection.
CAN bus transceiver 1 is supported the CAN2.0 high speed transmission of signals, and electromagnetic interference seldom has over temperature protection system, and is safe and reliable.
Claims (4)
1. method of the automobile key locking being controlled based on the CAN bus, specifically: CAN bus transceiver (1) sends vehicle speed signal to main control unit (3); Main control unit (3) receives vehicle speed signal, gathers local key status signal (6) and automobile gear signal (5) simultaneously; Main control unit (3) is handled judgement according to the signal that obtains, and produces key locking output control command; Key locking output control command is exported to current foldback circuit (4), and control electromagnetic valve (10) action is characterized in that: when judging that the automobile gear do not reduce to 4km/h when following in P shelves and the speed of a motor vehicle, control electromagnetic valve (10) adhesive.
2. the method for the automobile key locking being controlled based on the CAN bus as claimed in claim 1 is characterized in that: when judging that the automobile gear does not rise to 7km/h when above in P shelves and the speed of a motor vehicle, control electromagnetic valve (10) is unclamped.
3. the method for the automobile key locking being controlled based on the CAN bus as claimed in claim 1 is characterized in that: when judging the automobile gear at the P shelves, control electromagnetic valve (10) is unclamped.
4. the method for the automobile key locking being controlled based on the CAN bus as claimed in claim 1 is characterized in that: when detecting electromagnetic valve adhesive always above 360 minutes, control electromagnetic valve is unclamped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101758764A CN101402338B (en) | 2008-11-07 | 2008-11-07 | Automobile key latching controller based on CAN bus and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101758764A CN101402338B (en) | 2008-11-07 | 2008-11-07 | Automobile key latching controller based on CAN bus and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101402338A CN101402338A (en) | 2009-04-08 |
| CN101402338B true CN101402338B (en) | 2010-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008101758764A Active CN101402338B (en) | 2008-11-07 | 2008-11-07 | Automobile key latching controller based on CAN bus and control method thereof |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104019222A (en) * | 2014-06-12 | 2014-09-03 | 盛瑞传动股份有限公司 | Automatic speed changer control system |
| CN105488876B (en) * | 2015-11-25 | 2018-08-07 | 北京经纬恒润科技有限公司 | A kind of processing method and processing device of RKE data-signals |
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