CN203250191U

CN203250191U - Tractor can bus gateway controller

Info

Publication number: CN203250191U
Application number: CN2013201531812U
Authority: CN
Inventors: 周志立; 闫祥海; 徐立友; 张静云; 张敏; 刘宗剑; 白楠; 时辉
Original assignee: Henan University of Science and Technology
Current assignee: Henan University of Science and Technology
Priority date: 2013-03-29
Filing date: 2013-03-29
Publication date: 2013-10-23
Anticipated expiration: 2023-03-29

Abstract

The utility model relates to a tractor CAN bus gateway controller, and belongs to the technical field of vehicle-mounted electronic equipment and system. The CAN bus gateway controller comprises a processor, CAN interface circuits, a power module circuit, a clock crystal oscillator circuit and a JTAG circuit; the two CAN interface circuits are respectively used for connecting a tractor bus and a farm tool bus; the processor is connected with the CAN interface circuits; the processor is used for delimiting data transmission rate and priority on the two buses, and is used for conversion of choosing the information so as to complete communication between the tractor and different CAN network systems. The tractor CAN bus gateway controller realizes communication conversion between the tractor bus and the farm tool bus, simultaneously reduces communication wiring, saves cost and improves tractor communication quality; and the gateway controller can provide other network interfaces, so certain inheritance and versatility are provided.

Description

Tractor CAN bus network gateway controller

Technical field

The utility model relates to tractor CAN bus network gateway controller, belongs to vehicle electronic device and systems technology field.

Background technology

Along with the tractor electronics to networking, intelligent, distributed control technology future development, the CAN bussing technique as a kind of real-time, to stablize that high bussing technique is applied on tractor and the farm implements be the direction of current tractor informationization and automation development, ISO11783(tractor and agricultural forest machinery Serial Control and communication data network) agreement divides tractor CAN network for tractor bus network and farm implements bus network two parts, and this two-part communication work realizes by gateway.Gateway controller generally is in tractor car load network topology center, connects tractor bus network and farm implements bus network, finishes transition of communications, with the effect that reduces communication wires, saves cost and improve communication quality.

The utility model content

The purpose of this utility model provides tractor CAN bus network gateway controller, to satisfy communicating by letter of tractor bus and farm implements bus in the tractor CAN network.

The utility model provides tractor CAN bus network gateway controller for solving the problems of the technologies described above, this gateway controller comprises processor, the CAN interface circuit, power module circuitry, clock crystal oscillator circuit and jtag circuit, described CAN interface circuit has two, be respectively applied to connect tractor bus and farm implements bus, processor links to each other with the CAN interface circuit, be used for message transmission rate on two buses, priority delimited and the choice of message changed, to finish the communication between tractor and the different CAN network system, the clock crystal oscillator circuit links to each other with processor, is used to processor that clock signal is provided.

Described power module circuitry comprises LM317 and TPS767D301, LM317 is used for the 12V direct supply of tractor is converted to the direct supply of 5V, and TPS767D301 is used for becoming 3.3V and 1.9V DC voltage for processor, clock crystal oscillator circuit and jtag circuit the 5V voltage transitions that converts to.

Simulation in described power module circuitry ground with digitally be connected by inductance, VDD-to-VSS is connected by electric capacity.

Described reset circuit comprises electrify restoration circuit and manual reset circuit.

Described jtag circuit is used for debugging and the burning of program.

Described CAN interface circuit comprises CAN transceiver, isolation optocoupler and direct insertion interface, and the data input and output port of CAN transceiver links to each other with processor by the isolation optocoupler, and described CAN transceiver adopts SN65HVD230.

The Rs pin of described CAN transceiver is connected with the slope resistance of an end ground connection, on the Vcc pin and be connected to two and move back lotus root electric capacity, is used for eliminating the medium, high frequency intercoupling of circuit network.

Be connected with terminal resistance on the terminal of the CAN_H of described CAN transceiver and the wire of CAN_L, be used for preventing that data are reflected the broken loop data of reflection wave of generation in the wire terminal.

Described slope resistance value is 100K Ω, and two capacitive reactances of moving back lotus root electric capacity respectively value are 0.1 μ F and 10 μ F.

Described processor adopting DSP2000 family chip TMS320F28335, this integrated chip has the CAN bus module, and the CAN bus module in this processor links to each other with described two CAN bus interface circuits.

The beneficial effects of the utility model are: CAN bus network gateway controller of the present utility model comprises processor, the CAN interface circuit, power module circuitry, clock crystal oscillator circuit and jtag circuit, the CAN interface circuit has two, be respectively applied to connect tractor bus and farm implements bus, processor links to each other with the CAN interface circuit, be used for message transmission rate on two buses, priority delimited and the choice of message changed, to finish the communication between tractor and the different CAN network system, the utility model has been realized the transition of communications between tractor bus and the farm implements bus, having reduced simultaneously communication does not limit, save cost and improved the communication quality of tractor, this gateway controller can provide other network interface, so that this utility model has certain inheritance and versatility.

Description of drawings

Fig. 1 is the connection layout of CAN bus network gateway controller of the present utility model and tractor car-mounted device;

Fig. 2 is the structured flowchart of CAN bus network gateway controller of the present utility model;

Fig. 3 is the CAN interface circuit structure figure of CAN bus network gateway controller of the present utility model;

Fig. 4 is the processor interface synoptic diagram of CAN bus network gateway controller of the present utility model;

Fig. 5 is the power module circuitry structural drawing of CAN bus network gateway controller of the present utility model;

Fig. 6 is the clock circuit structural drawing of CAN bus network gateway controller of the present utility model;

Fig. 7 is the manual reset circuit structural drawing of CAN bus network gateway controller of the present utility model.

Embodiment

Below in conjunction with accompanying drawing embodiment of the present utility model is further described.

Fig. 1 is the utility model gateway controller and car-mounted device connection layout.Engine ECU, automatic transmission ECU and traction control ECU are connected on the tractor bus, with the message transmission rate communication of 250Kbps; Virtual terminal, task controller, supervisory computer interface and agricultural machinery and implement ECU are connected on the farm implements bus, with the message transmission rate communication of 125Kbps.Gateway connects tractor bus and farm implements bus, and the delimitation of the message transmission rate on two buses, priority, the contents such as choice of message are changed, and finishes the communication between the different CAN network systems of tractor.As shown in Figure 2, gateway controller of the present utility model comprises processor, CAN interface circuit, power module circuitry, clock crystal oscillator circuit and jtag circuit, described CAN interface circuit has two, be respectively applied to connect tractor bus and farm implements bus, processor links to each other with the CAN interface circuit, be used for message transmission rate on two buses, priority delimited and the choice of message is changed, to finish the communication between tractor and the different CAN network system, the clock crystal oscillator circuit links to each other with processor, is used to processor that clock signal is provided.Engine ECU, automatic transmission ECU and traction control ECU realize sharing of communication and message by the tractor bus, virtual terminal, task controller, supervisory computer interface and agricultural machinery and implement ECU realize sharing of communication and message by the farm implements bus, and some message need to be transferred on the farm implements bus from the tractor bus, owing to the priority in data transfer speed, the Frame on two buses is different, message can not effectively be identified.Gateway controller can be changed different message on two buses by the algorithm in the storer, so that message can be transmitted two buses.

The utility model gateway controller processor adopting TI DSP C2000 of company family chip TMS320F28335, this chip dominant frequency 150M, processing speed is fast, cost performance is high, storage space is large, be integrated with enhancement mode CAN(eCAN in peripheral hardware aboundresources and the chip) bus module, two CAN bus interface eCAN – A and eCAN – B are provided, satisfy gateway controller CAN interface quantity and communicating requirement, and can carry out the expansion of other network interfaces, convenient later exploitation.

Fig. 3 is the utility model gateway controller CAN interface circuit.Two-way CAN interface circuit is arranged in the utility model gateway controller, be used for the acceptance of message on tractor bus and the farm implements bus/transmission.This circuit diagram is comprised of acp chip, CAN transceiver, the electronic devices and components such as isolation optocoupler, resistance and electric capacity.The output pin TX of CAN controller receives the data input pin D of SN65HVD230, message can be sent in the CAN network, and the reception pin RX of controller and the data output end R of transceiver links to each other, and is used for receiving message.

Can be set to high speed, 3 kinds of different mode of operations of slope and wait by this transceiver by control transceiver Rs pin.In order to reduce the electromagnetic interference (EMI) that causes because of the level fast rise, select the slope control mode, the slope resistance of Rs pin with an end ground connection is connected, resistance value is 100K Ω.Be connected to the voltage of 3.3V at the Vcc pin, and be connected to two decoupling capacitances, capacitive reactance is taken as respectively 0.1 μ F and 10 μ F, plays the effect of eliminating the medium, high frequency intercoupling in the circuit network.Access the resistance of 120 Ω in the terminal of CAN_H and CAN_L wire and make terminal resistance, prevent from that data are reflected in the wire terminal to produce reflection wave and destroy data.

Between acp chip and transceiver, be added with the isolation optocoupler, signal is isolated, further improve the bus node antijamming capability.

Fig. 5 is the utility model gateway controller power module circuitry.Because vehicle carried power voltage is generally the 12V DC voltage on the tractor, so the utility model uses LM317 to convert the 12V DC voltage of tractor power supply the DC voltage of 5V to, then use TPS767D301 to become the 3.3V of voltage stabilization, dependable performance and 1.9V DC voltage for acp chip and peripheral chip the 5V voltage transitions that converts to.In the designing power supply module, to simulate ground and digitally couple together by inductance at last, VDD-to-VSS couples together by electric capacity.

Fig. 6 is the utility model gateway controller clock circuit.Clock circuit provides clock by the external active crystal oscillator, and crystal oscillator frequency is 30MHz, after PLL five frequencys multiplication, finally provides the clock of 150MHz.

Fig. 7 is the utility model gateway controller manual reset circuit.The utility model reset circuit comprises electrify restoration circuit and manual reset circuit, and power-on reset signal is produced by TPS767D301 chip self, and this reset signal can be directly for dsp chip.The hand-reset signal is comprised of IMP811 chip and reset key, finishes the controller hand-reset.

The utility model uses the Integrated Development Environment CCS3.3 of TI company, algorithm to the gateway controller transition of communications is programmed, generate executable file, connect CCS software and controller JTAG download mouth by emulator, the design of gateway controller is finished in the operations such as the debugging of realization program, download, programming and curing.The utility model has been realized the transition of communications between tractor bus and the farm implements bus, having reduced simultaneously communication does not limit, save cost and improved the communication quality of tractor, this gateway controller can provide other network interface, so that this utility model has certain inheritance and versatility.

Claims

1. tractor CAN bus network gateway controller, it is characterized in that: this gateway controller comprises processor, the CAN interface circuit, power module circuitry, clock crystal oscillator circuit and jtag circuit, described CAN interface circuit has two, be respectively applied to connect tractor bus and farm implements bus, processor links to each other with the CAN interface circuit, be used for message transmission rate on two buses, priority delimited and the choice of message changed, to finish the communication between tractor and the different CAN network system, the clock crystal oscillator circuit links to each other with processor, is used to processor that clock signal is provided.

2. tractor CAN bus network gateway controller according to claim 1, it is characterized in that: described power module circuitry comprises LM317 and TPS767D301, LM317 is used for the 12V direct supply of tractor is converted to the direct supply of 5V, and TPS767D301 is used for becoming 3.3V and 1.9V DC voltage for processor, clock crystal oscillator circuit and jtag circuit the 5V voltage transitions that converts to.

3. tractor CAN bus network gateway controller according to claim 2 is characterized in that: the simulation ground in the described power module circuitry with digitally be connected by inductance, VDD-to-VSS is connected by electric capacity.

4. tractor CAN bus network gateway controller according to claim 1 is characterized in that: described jtag circuit is used for debugging and the burning of program.

5. tractor CAN bus network gateway controller according to claim 1, it is characterized in that: described CAN interface circuit comprises CAN transceiver, isolation optocoupler and direct insertion interface, the data input and output port of CAN transceiver links to each other with processor by the isolation optocoupler, and described CAN transceiver adopts SN65HVD230.

6. tractor CAN bus network gateway controller according to claim 5, it is characterized in that: the Rs pin of described CAN transceiver is connected with the slope resistance of an end ground connection, on the Vcc pin and be connected to two and move back lotus root electric capacity, be used for eliminating the medium, high frequency intercoupling of circuit network.

7. tractor CAN bus network gateway controller according to claim 6, it is characterized in that: be connected with terminal resistance on the terminal of the CAN_H of described CAN transceiver and the wire of CAN_L, be used for preventing that data are reflected the broken loop data of reflection wave of generation in the wire terminal.

8. tractor CAN bus network gateway controller according to claim 6, it is characterized in that: described slope resistance value is 100K Ω, two capacitive reactances of moving back lotus root electric capacity respectively value are 0.1 μ F and 10 μ F.

9. tractor CAN bus network gateway controller according to claim 1, it is characterized in that: described processor adopting DSP2000 family chip TMS320F28335, this integrated chip has the CAN bus module, and the CAN bus module in this processor links to each other with described two CAN interface circuits.