CN101456390A - Communication control system applied to automobile ECU - Google Patents
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Abstract
The invention discloses a communication control system applied to an automobile ECU, which comprises a vehicle ECU, a first bus, a second bus and a bus gateway, wherein the communication rate requirement of the first bus is higher than that of the vehicle ECU presetting a first threshold; the communication rate requirement of the second bus is lower than that of the vehicle ECU presetting the first threshold; and the bus gateway is connected with the first bus and the second bus respectively, and transforms and transmits signals sent by the vehicle ECU specified by the first bus and/or the second bus. The communication control system can utilize bus resources effectively and fully to reduce cost, and realize supporting larger communicating data amount to improve the stability and real time of the system. Furthermore, an optimized topology structure provides greater convenience for the extension and change of the whole vehicle functions.
Description
Technical field
The present invention relates to technical field of automotive electronics, more particularly, the present invention relates to a kind of communication control system that is applied to automobile ECU.
Background technology
Along with to automobile at the increasingly stringent that requires aspect discharging, energy consumption and the safety performance, and the user is to improving constantly that car comfort requires, modern automobile often uses a large amount of ECU (Electronic ControlUnit, electronic control unit), for example, ABS (Antilock Braking System, anti-lock braking system), engine management system, anti-slip regulation, air-conditioner control system, central controlled lock, automatic seat etc.; By the use of above-mentioned ECU, actv. is realized the control to automobile more, reduces and pollutes and energy savings, and provide the environment of safety and comfort more to the user.
In order to satisfy the demand of data exchange between each ECU of automobile, early stage solution is to adopt independently lead and switch control for each ECU; Along with increasing of ECU, the wire harness that signal post uses is more and more, and this has not only caused the raising of cost and the increase of vehicle weight, has also caused the very complicated of car load circuit and the rising of fault rate.In order to carry out data handing faster, and reduce hardware communications wire harness amount between the ECU, nineteen eighty-three, Germany BOSCH (Bosch) company developed CAN (Controller Area Network, controller local area network) bus; In the existing automobile design, the CAN bus has been widely used in the vehicle-mounted ECU communication control, is comprised that all multi-brands such as benz, BMW, masses, Volvo and Reynolds producer adopts.
Existing application in the topological structure of the communication control system of automobile ECU as shown in Figure 1, each ECU is as node, adopt the arbitration mode by turn of no damage structure to compete according to the bus access preceence and send data, thereby realize communication each other to a CAN bus.
As can be seen, the topological structure of the communication control system of existing automobile ECU is a kind of single unidirectional communication road communication control system, can only realize the mutual of information by a CAN bus; In fact, each automobile ECU is different for the requirement of traffic rate, such as the rate requirement of power chassis system than higher, and its required communication rate of the display system of instrument sound equipment is lower, and, in order to guarantee the reliability of safety system, be necessary for the ECU that carries out safety air bag control high-revolving communication network is provided.Obviously, on existing topological structure, carry out network service, owing to can only adopt the mono-traffic rate, that is can only take very high traffic rate satisfying the requirement of part ECU, thereby cause the insignificant network service wasting of resources; Simultaneously, great deal of nodes communicates competition on a CAN bus, also causes the instability of network conflict and whole ECU communication control system easily; In addition, this mono-topological structure is unfavorable for that also the ECU communication control system closes the expansion of whole vehicle functions.
Along with increasing of CAN bus institute carry number of nodes and continuing to increase of data traffic, above-mentioned defective highlights day by day, caused existing application to be faced adverse conditions, and still do not had the adequate solution scheme at present in every aspects such as weight, deployment, cost and communication efficiencies in the communication control system of automobile ECU.
Summary of the invention
The present invention is intended to overcome above-mentioned defective of the prior art, and a kind of vehicle-mounted ECU communication control scheme of optimization is provided, realizing differentiation support to different communication rate requirement ECU, and to the support of higher amount of communication data and system extension.
For achieving the above object, embodiments of the invention provide a kind of communication control system that is applied to automobile ECU, comprise vehicle-mounted ECU, also comprise:
Articulate first bus that required communication rate is higher than the vehicle-mounted ECU of preset first threshold value;
Articulate second bus that required communication rate is lower than the vehicle-mounted ECU of preset first threshold value;
Connect this first bus and second bus respectively, the appointment signal that vehicle-mounted ECU sent on this first bus and/or second bus is changed the bus gateway of transmission.
Preferable, this bus gateway is arranged in the car body controller.
Preferable, this first bus is the high-speed CAN bus that meets the ISO11898 standard.
Preferable, this second bus is the low speed CAN bus that meets the ISO11898-3 standard.
Preferable, this first bus and/or second bus are many, are connected respectively to this bus gateway; Wherein, the number of every bus carry vehicle-mounted ECU is not more than 20.
Preferable, also comprise: articulate the 3rd bus that required communication rate is lower than the vehicle-mounted ECU of default second threshold value; Wherein, this second bus articulates that required communication rate is lower than preset first threshold value but the vehicle-mounted ECU that is higher than default second threshold value.
Preferable, the 3rd bus is the LIN bus, and is provided with the scheduling that major joint carries out LIN bus transfer signal.
Preferable, this major joint is arranged in this bus gateway and/or this car body controller.
Preferable, the 3rd bus is two or many; For the 3rd bus is two situation, and the vehicle-mounted ECU of a carry comprises each anti-pinch module ECU; The ECU of another carry comprises rain sensor ECU and anti-theft loudspeaker ECU.
As shown from the above technical solution, embodiments of the invention are by being distinguished support to different communication rate requirement ECU, and introduce the bus gateway and realize signal sharing between different bus, have following beneficial effect:
1, the bus classification is than single pass single communication speed, can be more effectively and utilize bus resource, cost-cutting fully;
2, bus networkization can realize the support to higher amount of communication data than unibus structure, improves system stability and real-time;
3, the topological structure of You Huaing provides bigger facility for the expansion and the change of whole vehicle functions.
With reference to the accompanying drawing description of a preferred embodiment, above-mentioned and other purpose of the present invention, feature and advantage will be more obvious by following.
Description of drawings
Fig. 1 is the topological structure scheme drawing of the communication control system of automobile ECU in the prior art;
Fig. 2 is the topological structure block diagram of communication control system one embodiment of automobile ECU provided by the invention;
Fig. 3 is the topological structure scheme drawing of communication control system one specific embodiment of automobile ECU provided by the invention.
The specific embodiment
To describe specific embodiments of the invention in detail below.Should be noted that the embodiments described herein only is used for casehistory, is not limited to the present invention.
Main design of the present invention is the classification by automobile bus, solves that the waste of the existing communication resource of single bus topological structure is serious, cost is high, efficient is low and stable problem such as not good.Like this, for helping the reader better to understand the present invention.
To introduce the communication control system that is applied to automobile ECU provided by the present invention in detail below.
As shown in Figure 2, the block diagram that has shown communication control system 200 1 embodiment of automobile ECU, comprise vehicle-mounted ECU 210, those skilled in the art can understand, along with the development of vehicle electronicsization, have increasing vehicle-mounted ECU and be applied to automotive field, realize various ancillary control functions, and their signal transmission are each other just finished by bus.
In embodiment illustrated in fig. 2, also comprise: articulate first bus 220 that required communication rate is higher than the vehicle-mounted ECU 210 of preset first threshold value; This part ECU210 mainly partly is made of the higher power of required communication rate, chassis and safety air bag, because concrete required communication rate be along with can there be certain discrepancy in different vehicles, so the actual value of first threshold can be by engineering staff's accommodation in addition;
As a preferred embodiment, this first bus 220 can select to meet the high-speed CAN bus of ISO11898 standard; Those skilled in the art can understand, and the ECU210 that is articulated on first bus 220 can transmit with same traffic rate, and the signal transmission rate of general high-speed CAN bus is in the scope of 250kbit/s～500kbit/s.
In embodiment illustrated in fig. 2, also comprise: articulate second bus 230 that required communication rate is lower than the vehicle-mounted ECU 210 of preset first threshold value; This part ECU230 mainly partly is made of the not too high instrument of required communication rate, sound equipment, air-conditioning etc.;
As a preferred embodiment, this second bus 230 can select to meet the low speed CAN bus of ISO11519-2 standard; Same, the ECU210 that is articulated on second bus 230 can transmit with same traffic rate, and the signal transmission rate of general low speed CAN bus can be controlled at below the 125kbit/s.
In embodiment illustrated in fig. 2, also comprise: connect first bus 220 and second bus 230 respectively, the appointment signal that vehicle-mounted ECU sent on first bus 220 and/or second bus 230 is changed the bus gateway 240 of transmission;
This bus gateway 240 can be arranged in the car body controller.
As can be seen, the unified bus of prior art can only provide single-rate, and in order to guarantee the needs of the ECU that rate requirement is higher, this unified bus can only adopt higher speed, and come the signal of the lower ECU of transmission rate request with so high speed, beyond doubt to a kind of waste of bus resource; The vehicle-mounted ECU communication control system 200 that provides embodiment illustrated in fig. 2 can effectively overcome this problem: by the classification of automobile bus, the lower ECU of the ECU that rate requirement is higher and rate requirement carry respectively carries out the signal transmission on different buses, can make the lower ECU carry of rate requirement on low speed bus, thereby the saving bus resource, cost-cutting.
In addition, the grading system of bus has brought bus-structured networking, and the node that needs carry is distributed on the different buses, therefore can reduce the generation of the unstable situation of network conflict and system, improves system stability and real-time; Accordingly, multiple bus can the more relatively node of carry, thereby realizes the support to higher amount of communication data;
Simultaneously, the networking of bus can be added some ECU easily and be used for the function expansion, thereby avoids the existing low defective of vehicle-mounted ECU communication control system extensibility.
Further, in order effectively to avoid the unsettled situation of network conflict and system, preferable technical scheme is: first bus 220 and/or second bus 230 are many, are connected respectively to this bus gateway 240, guarantee that the number of every bus carry vehicle-mounted ECU 210 is not more than 20.
Further again, can further distinguish the vehicle-mounted ECU 210 that second bus 230 in embodiment illustrated in fig. 2 articulates, the vehicle-mounted ECU 210 that required communication rate is lower than default second threshold value is carried out carry by the 3rd bus separately, this part vehicle-mounted ECU 210 mainly is that some experience related little ECU with traffic safety or passenger, such as anti-theft loudspeaker, rain sensor or the like, this class vehicle-mounted ECU often do not need with bus on ECU carry out handshaking, therefore can independently be provided with, carry out local signal transmission.
For further cost-cutting, as a preferred embodiment, the 3rd bus can adopt low-cost LIN (Local Interconnect Network, local interlinkage network) bus, and, be provided with the scheduling that major joint carries out LIN bus transfer signal according to the requirement of LIN bus.
Preferable, this major joint can be arranged in the bus gateway 240, and the 3rd bus is to be two or many.
Below, by a specific embodiment communication control system of automobile ECU provided by the invention is carried out exemplary illustration, please refer to Fig. 3.
In this embodiment, two kinds of network-bus CAN buses of present comparative maturity and LIN bus are introduced inside the same topological structure, the technology that adopts gateway simultaneously couples together the bus that difference requires, and with the optimization that realizes resource with share, improves the real-time of system.
Concrete, four networks that the topological structure of the communication control system of automobile ECU is made up of three kinds of buses (high-speed CAN, low speed CAN and LIN) among this embodiment constitute, and participate in bus communication by 18 vehicle-mounted ECU, and concrete carry situation is as follows:
7 vehicle-mounted ECU of high-speed CAN bus carry constitute the high-speed CAN network, be respectively engine control module (Engine Control Module, be called for short ECM), brake system module (Braking SystemModule, be called for short BSM), change speed gear box control module (Transmission Control Module, be called for short TCM), deflection angle module (Steering Angle Module is called for short SAM), servo-steering module (Electronic Steering Module, be called for short ESM), air bag module (Air Bag Module is called for short ABM) and moment of torsion module (Torque Management Module, be called for short TMM, also claim the 4 wheel driven system);
4 vehicle-mounted ECU of low speed CAN bus carry constitute low speed CAN network, be respectively back Body control module (Rear Body Control Module, be called for short RBCM), gauge control module (InstrumentCluster Module, be called for short ICM), sound equipment control module (Radio Receiver Module is called for short RRM) and air-conditioning (CLM Climate Module);
The LIN bus is two, and 2 vehicle-mounted ECU of a carry are respectively anti-theft loudspeaker and rain sensor, and 4 vehicle-mounted ECU of a carry are respectively four (driver's side, secondary driver's side, right back door and left back door) glass anti-pinch modules;
In addition, high-speed CAN network and low speed CAN network are realized handshaking by gateway, the LIN network carries out the scheduling of signal by major joint, the gateway of this high low speed CAN network and the major joint of LIN network all are integrated in a vehicle-mounted ECU--car body controller (Body Control Module, be called for short BCM) in, particularly, the master node functionality of this LIN network can be finished by this gateway, LIN network host node that promptly this gateway is simultaneously integrated, like this, if there is the ECU that need carry out handshaking with the CAN network in the LIN network, gateway can be realized supporting in the lump.
Wherein, the high-speed CAN bus speed in the present embodiment is 500kbit/s, and low speed CAN Bus Speed is 50kbit/s, and the LIN Bus Speed is 9.6kbit/s; Those skilled in the art can understand, and above-mentioned Bus Speed can be set at the arbitrary value within the international standard, and above-mentioned value only is an exemplary value in the practical application.
As realizing that each bus signals is shared and the gateway of signal dispatching function, be key component embodiment illustrated in fig. 3, therefore it is described below in conjunction with concrete signal:
At first, gateway is the interface of the signal conversion of high-speed CAN network and low speed CAN network, and high-speed CAN network and low speed CAN network are needed the signal of mutual communication, comes out according to the Address Recognition of signal sending node, and is forwarded to other CAN network; Other nodes extract the signal that needs according to the Signal Message Address after changing.
Concrete, the signal conversion of this high-speed CAN network and low speed CAN network is divided into both direction:
(1) the conversion tabulation of the signal from the high-speed CAN network to low speed CAN network (table 1):
Table 1
Promptly, the information of engine control module, brake system module, change speed gear box control module, deflection angle module, servo-steering module, air bag module and moment of torsion module can send in the low speed CAN network by webmaster, needs the node of these information to discern corresponding information and reception according to forwarding address in the low speed CAN network;
(2) the conversion tabulation of the signal from low speed CAN network to the high-speed CAN network (table 2):
Table 2
That is, the information of back Body control module, gauge control module, sound equipment and air-conditioning sends in the high-speed CAN network by gateway, needs the node of these information to discern corresponding information and reception according to forwarding address in the high-speed CAN network.
Secondly, gateway connection rain sensor and anti-theft loudspeaker connect four glass anti-pinch modules and constitute another LIN network as a LIN network; Separately two LIN networks help the raising of real-time communication and the conflict that reduces network.
As can be seen, the embodiment of vehicle-mounted ECU communication control system shown in Figure 3 effectively combines the efficient of CAN bus and LIN bus and the advantage of cost, the vehicle-mounted ECU that rate requirement is higher is distinguished carry on three kinds of different buses with requiring low vehicle-mounted ECU, adopt the information sharing of the form realization different rates bus of gateway again, but the advantage of this scheme be exactly on the bus information transmitted amount big, and can add some systems easily and be used for the function expansion, thereby avoided the sharable quantity of information of traditional single bus and single channel network few, the shortcoming that extensibility is low; Particularly, there is following advantage in this embodiment:
(1) by the combination of two kinds of bus CAN and LIN, make that two kinds of buses can realize having complementary advantages, more effectively and fully utilize resource, provide cost savings;
(2) adopted the network-bus of four relatively independent controls, carried out bus assignment, the load factor of bus has been controlled in the reasonable range, strengthened the reliability and the real-time of network service at each different vehicle-mounted ECU characteristics;
(3) at different network-bus, adopted the technology of gateway, when realizing information sharing, whole network is carried out the global network management, increased the reliability of network;
(4) can more help the optimization of car load topology network, each vehicle-mounted ECU can have more rational distribution in network.
Though described the present invention with reference to several exemplary embodiments, should be appreciated that used term is explanation and exemplary and nonrestrictive term.The spirit or the essence that do not break away from invention because the present invention can specifically implement in a variety of forms, so be to be understood that, the foregoing description is not limited to any aforesaid details, and should be in the spirit and scope that claim limited of enclosing explain widely, therefore fall into whole variations in claim or its equivalent scope and remodeling and all should be the claim of enclosing and contain.
Claims (9)
1, a kind of communication control system that is applied to automobile ECU comprises vehicle-mounted ECU; It is characterized in that, also comprise:
Articulate first bus that required communication rate is higher than the vehicle-mounted ECU of preset first threshold value;
Articulate second bus that required communication rate is lower than the vehicle-mounted ECU of preset first threshold value;
Connect described first bus and second bus respectively, the appointment signal that vehicle-mounted ECU sent on described first bus and/or second bus is changed the bus gateway of transmission.
2, a kind of communication control system that is applied to automobile ECU according to claim 1 is characterized in that, described bus gateway is arranged in the car body controller.
3, a kind of communication control system that is applied to automobile ECU according to claim 1 is characterized in that, described first bus is the high-speed CAN bus that meets the ISO11898 standard.
4, a kind of communication control system that is applied to automobile ECU according to claim 1 is characterized in that, described second bus is the low speed CAN bus that meets the ISO11898-3 standard.
5, a kind of communication control system that is applied to automobile ECU according to claim 1 is characterized in that, described first bus and/or second bus are many, is connected respectively to described bus gateway; Wherein, the number of every bus carry vehicle-mounted ECU is not more than 20.
6, according to the arbitrary described a kind of communication control system that is applied to automobile ECU of claim 1-5, it is characterized in that, also comprise:
Articulate the 3rd bus that required communication rate is lower than the vehicle-mounted ECU of default second threshold value; Wherein, described second bus articulates that required communication rate is lower than preset first threshold value but the vehicle-mounted ECU that is higher than default second threshold value.
7, a kind of communication control system that is applied to automobile ECU according to claim 6 is characterized in that, described the 3rd bus is the LIN bus, and is provided with the scheduling that major joint carries out LIN bus transfer signal.
8, a kind of communication control system that is applied to automobile ECU according to claim 7 is characterized in that, described major joint is arranged in described bus gateway and/or the described car body controller.
9, a kind of communication control system that is applied to automobile ECU according to claim 7 is characterized in that, described the 3rd bus is two or many.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102416913A (en) * | 2010-09-27 | 2012-04-18 | 比亚迪股份有限公司 | CAN (Controller Area Network) bus topology structure and method for starting vehicle by using same |
| CN102890500A (en) * | 2012-09-21 | 2013-01-23 | 北京智行鸿远汽车技术有限公司 | Network communication system of new energy passenger vehicle |
| CN103158648A (en) * | 2011-12-19 | 2013-06-19 | 北汽福田汽车股份有限公司 | Vehicle-mounted local area network (LAN) structure for car and car with the same |
| CN103209118A (en) * | 2012-01-16 | 2013-07-17 | 株式会社电装 | In-vehicle gateway apparatus, communication system for vehicle and program product for transmitting vehicle related data set |
| CN103458585A (en) * | 2013-09-11 | 2013-12-18 | 北京汽车股份有限公司 | LED soft light bar control module and vehicle |
| CN104612844A (en) * | 2013-11-05 | 2015-05-13 | 上海通用汽车有限公司 | Engine control method for closing deceleration fuel cutoff after ABS fault and control system |
| CN112416838A (en) * | 2020-11-02 | 2021-02-26 | 光华临港工程应用技术研发(上海)有限公司 | Communication device, method, system and storage medium based on different buses |
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- 2008-10-17 CN CN2008101553656A patent/CN101456390B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102416913A (en) * | 2010-09-27 | 2012-04-18 | 比亚迪股份有限公司 | CAN (Controller Area Network) bus topology structure and method for starting vehicle by using same |
| CN102416913B (en) * | 2010-09-27 | 2015-12-02 | 比亚迪股份有限公司 | CAN topological structure and utilize the vehicle starting method of this topological structure |
| CN103158648A (en) * | 2011-12-19 | 2013-06-19 | 北汽福田汽车股份有限公司 | Vehicle-mounted local area network (LAN) structure for car and car with the same |
| CN103209118A (en) * | 2012-01-16 | 2013-07-17 | 株式会社电装 | In-vehicle gateway apparatus, communication system for vehicle and program product for transmitting vehicle related data set |
| CN103209118B (en) * | 2012-01-16 | 2016-08-17 | 株式会社电装 | Car borne gateway equipment, for the communication system of vehicle with for the method that sends vehicle-relevant data collection |
| CN102890500A (en) * | 2012-09-21 | 2013-01-23 | 北京智行鸿远汽车技术有限公司 | Network communication system of new energy passenger vehicle |
| CN103458585A (en) * | 2013-09-11 | 2013-12-18 | 北京汽车股份有限公司 | LED soft light bar control module and vehicle |
| CN103458585B (en) * | 2013-09-11 | 2015-07-01 | 北京汽车股份有限公司 | LED soft light bar control module and vehicle |
| CN104612844A (en) * | 2013-11-05 | 2015-05-13 | 上海通用汽车有限公司 | Engine control method for closing deceleration fuel cutoff after ABS fault and control system |
| CN104612844B (en) * | 2013-11-05 | 2017-05-31 | 上海通用汽车有限公司 | The engine control and control system of DECEL ENLEAN are closed after ABS-system fault |
| CN112416838A (en) * | 2020-11-02 | 2021-02-26 | 光华临港工程应用技术研发(上海)有限公司 | Communication device, method, system and storage medium based on different buses |
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