CN201898522U - Car communication system - Google Patents
Car communication system Download PDFInfo
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- CN201898522U CN201898522U CN2010206071065U CN201020607106U CN201898522U CN 201898522 U CN201898522 U CN 201898522U CN 2010206071065 U CN2010206071065 U CN 2010206071065U CN 201020607106 U CN201020607106 U CN 201020607106U CN 201898522 U CN201898522 U CN 201898522U
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Abstract
A car communication system comprises two CAN (Controller Area Network) buses connected with each other via a gateway, wherein one of the CAN buses is connected with an engine management system while the other CAN bus is connected with control nodes on a car body. Compared with the prior art, a traditional diesel engine management system is directly used on a passenger vehicle without modification, so that the cost is saved, the communication of the two CAN buses is ensured to be smooth, and the manufacturing cost is lowered.
Description
Technical field
The present invention relates to a kind of automobile communication system.
Technical background
The worsening shortages of the energy and the mankind improve constantly environmental requirement, have proposed new challenge for the auto industry energy-saving and emission-reduction.Along with the progress of science and technology, particularly the rail technology is after successfully using on the Diesel engine altogether, and the advantage of diesel engine fuel-firing economy embodies at once, and the disadvantage of over-emitting black exhaust and so on also no longer exists.In Europe, almost half vehicle has all been brought into use diesel.The parties concerned believe that the diesel oil passenger car also will obtain significant progress in Chinese market.
Since the nineties in 20th century, the extensive use on automobile along with integrated circuit and single-chip microcomputer, the quantity of electronic control unit on the automobile (ECU, Electronic Control Unit) is more and more, and the application of bussing technique on automobile is also just more and more wider.Wherein, relatively Chang Yong automobile bus is the (CAN of controller local area network, Controller Area Network), it is to be to solve a kind of data communication protocol that the exchanges data between the ECU is developed in the Hyundai Motor by German BOSCH company the earliest, according to the ISO related standards, the topological structure of CAN is a bus type, so be also referred to as the CAN bus.
Because Diesel engine was widely used in commercial car in the past, so the Diesel engine management system is only supported SAE J1939 standard usually always.Many passenger cars main engine plants use the CAN network that satisfies the ISO11898 standard usually when the exploitation passenger car, so two kinds of communications protocol are incompatible, can't carry out communication.
The utility model content
The technical issues that need to address of the present invention are to reach the purpose of low speed CAN bus and high-speed CAN bus communication by a kind of automobile communication system.
In order to solve the problems of the technologies described above, technical scheme of the present invention is: a kind of automobile communication system, comprise two CAN buses, and two CAN buses connect by gateway, described one of them CAN bus is connected with engine management system, and another CAN bus is connected with each Body Control node.
Described two CAN buses, one of them is a high-speed CAN bus, another is a low speed CAN bus.
The transmission rate of described high-speed CAN bus is 500kbps, and the transmission rate of described low speed CAN bus is 250kbps.
Described high-speed CAN bus is connected with engine management system, described low speed CAN bus speed Control unit, slip control system, auxiliary guard system, anti-theft locking system of engine, the tire pressure management system, body control system, electric stabilizing system, rotary angle transmitter, all-wheel-drive system, instrument, nodes such as diagnostic system connect.
Described each Body Control node comprises the speed Control unit, slip control system, auxiliary guard system, anti-theft locking system of engine, the tire pressure management system, body control system, electric stabilizing system, rotary angle transmitter, all-wheel-drive system, instrument, nodes such as diagnostic system.
The output of described gateway also with external power supply, key gear ACC is connected the output head grounding of gateway with key gear ING.
The utility model compared with prior art makes traditional diesel engine management system directly be applied on the passenger car without revising, and provides cost savings, and has guaranteed the smooth and easy of two kinds of CAN bus communications, has reduced production cost.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further details;
Fig. 1 is the utility model schematic diagram;
Fig. 2 is gateway and two CAN bus connection diagrams among Fig. 1;
In Fig. 1-2,1, engine management system, 2, gateway, 3, low speed CAN bus, 4, high-speed CAN bus, 5, the speed Control unit, 6, slip control system, 7, auxiliary guard system, 8, anti-theft locking system of engine, 9, tire pressure management system, 10, body control system, 11, electric stabilizing system, 12, rotary angle transmitter, 13, all-wheel-drive system, 14, instrument, 15, diagnostic system, 16, external power supply.
Embodiment
As shown in Figure 1, a kind of automobile communication system comprises two CAN buses, and two CAN buses connect by gateway 2, and described one of them CAN bus is connected with engine management system 1, and another CAN bus is connected with each Body Control node.
Described two CAN buses, one of them is a high-speed CAN bus 4, another is a low speed CAN bus 3.
The transmission rate of described high-speed CAN bus 4 is 500kbps, and the transmission rate of described low speed CAN bus 3 is 250kbps.
Described each Body Control node comprises speed Control unit 5, slip control system 6, auxiliary guard system 7, anti-theft locking system of engine 8, tire pressure management system 9, body control system 10, electric stabilizing system 11, rotary angle transmitter 12, all-wheel-drive system 13, instrument 14, diagnostic system 15 nodes such as grade.
Described high-speed CAN bus 4 is connected with engine management system 1, and described low speed CAN bus 3 each Body Control node connect.
The output of described gateway 2 also with external power supply 16, key gear ACC is connected the output head grounding of gateway 2 with key gear ING.
We need external power source 16 power supplies gateway 2, and for energy savings, we need obtain ACC signal and IGN signal equally.
Connect two 62 ohm resistance in high-speed CAN bus 4 and low speed CAN bus 2 inside are equal.
We select the MC9S12XET256 that has 3 road CAN transmission-receiving functions in Freescale (Freescale) the MC9S12XE series for use gateway 2 single-chip microcomputers.MC9S12XE series is the release on the present S12XD series basis, and it has following new function: memory protection unit (MPU) and have flash memory, enhancement mode EEPROM function (EEE), enhancement mode XGATE, FM PLL (IPLL) and the quick A TD of error correcting code (ECC).MC9S12XE series is specifically designed to the automobile multiplex (MUX) and general vehicle body is used, and has all advantages and the effect of 32 performances and 16 MCU.Low cost that existing 16 MC9S12 and S12X MCU series of user enjoyed, low-power consumption, EMC and advantage such as code rate have efficiently been kept simultaneously.S12XE and S12XD series highly compatible.S12XS series can be expanded S12XE series economical and compatiblely.
Described low speed CAN bus 3 and speed Control unit 5, slip control system 6, auxiliary guard system 7, anti-theft locking system of engine 8, tire pressure management system 9, body control system 10, electric stabilizing system 11, rotary angle transmitter 12, all-wheel-drive system 13, instrument 14, diagnostic system 15 nodes such as grade connect.
The means of communication of a kind of automobile communication system, the described means of communication adopt following steps: gateway 2 beginning reception sources messages, fill object message according to the signal value in the source messages;
Do not receive source messages, default value is filled object message;
The source messages that receives is temporarily lost, and fills object message with the signal value that received last time, and is overtime up to source messages, and the signal value in the object message of overtime back is filled with default value.
Described time-out time is 3 times of message cycle.
In the netinit process,, then fill object message with default value if gateway is not received source messages.If receive source messages, then fill object message according to the signal value in the source messages.
If source messages is temporarily lost, then fill object message with the signal value that received last time, overtime until source messages, the signal value in the object message of overtime back is filled with invalid value (perhaps default value).The time-out time of each message is 3 times of message cycles.
For the preiodic type signal, the gateway time-delay is no more than the signal place twice in object message cycle; For the event mode signal, the gateway time-delay is no more than 10ms.
Claims (6)
1. an automobile communication system comprises two CAN buses, and two CAN buses connect by gateway (2), and it is characterized in that: described one of them CAN bus is connected with engine management system (1), and another CAN bus is connected with each Body Control node.
2. a kind of automobile communication according to claim 1 system is characterized in that: described two CAN buses, and one of them is high-speed CAN bus (4), another is a low speed CAN bus (3).
3. a kind of automobile communication according to claim 2 system, it is characterized in that: the transmission rate of described high-speed CAN bus (4) is 500kbps, the transmission rate of described low speed CAN bus (3) is 250kbps.
4. according to claim 2 or 3 described a kind of automobile communication systems, it is characterized in that: described each Body Control node comprises speed Control unit (5), slip control system (6), auxiliary guard system (7), anti-theft locking system of engine (8), tire pressure management system (9), body control system (10), electric stabilizing system (11), rotary angle transmitter (12), all-wheel-drive system (13), instrument (14), diagnostic system nodes such as (15).
5. a kind of automobile communication according to claim 4 system, it is characterized in that: described high-speed CAN bus (4) is connected with engine management system (1), described low speed CAN bus (3) and speed Control unit (5), slip control system (6), auxiliary guard system (7), anti-theft locking system of engine (8), tire pressure management system (9), body control system (10), electric stabilizing system (11), rotary angle transmitter (12), all-wheel-drive system (13), instrument (14), diagnostic system nodes such as (15) connects.
6. a kind of automobile communication according to claim 1 system is characterized in that: the output of described gateway (2) also with external power supply (16), key gear ACC is connected with key gear ING, the output head grounding of gateway (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206071065U CN201898522U (en) | 2010-11-15 | 2010-11-15 | Car communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206071065U CN201898522U (en) | 2010-11-15 | 2010-11-15 | Car communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201898522U true CN201898522U (en) | 2011-07-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206071065U Expired - Fee Related CN201898522U (en) | 2010-11-15 | 2010-11-15 | Car communication system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101992736A (en) * | 2010-11-15 | 2011-03-30 | 埃泰克汽车电子(芜湖)有限公司 | Car communication system and communication method thereof |
| CN112995249A (en) * | 2019-12-12 | 2021-06-18 | 长城汽车股份有限公司 | Internet of vehicles data processing method, device and system |
-
2010
- 2010-11-15 CN CN2010206071065U patent/CN201898522U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101992736A (en) * | 2010-11-15 | 2011-03-30 | 埃泰克汽车电子(芜湖)有限公司 | Car communication system and communication method thereof |
| CN112995249A (en) * | 2019-12-12 | 2021-06-18 | 长城汽车股份有限公司 | Internet of vehicles data processing method, device and system |
| CN112995249B (en) * | 2019-12-12 | 2022-05-17 | 长城汽车股份有限公司 | Internet of vehicles data processing method, device and system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110713 Termination date: 20151115 |
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| EXPY | Termination of patent right or utility model |