CN103368801A - High-and-low speed CAN (controller area network) bus compatible device and working method thereof - Google Patents

Abstract

The invention discloses a high-and-low speed CAN (controller area network) bus compatible device and a working method thereof. The device comprises a programmable processor which takes charge of bus initialization and data processing, a CAN bus controller, a low-speed CAN bus transceiver and a high-speed CAN bus transceiver; the programmable processor is connected with the CAN bus controller; two circuits are divided from the CAN bus controller to respectively connect the high-speed CAN bus transceiver and the low-speed CAN bus transceiver; the high-speed CAN bus transceiver and the low-speed CAN bus transceiver are connected with each other through a selector switch, and then are connected into an in-vehicle CAN network; and meanwhile, the selector switch is directly connected with the programmable processor. The device and the working method thereof have the beneficial effects that the compatibility of a high-speed CAN network and a low-speed CAN network is realized; processing architecture is unified; the device is convenient to install and maintain; the unified processing of the data of the high-speed CAN network and the low-speed CAN network is realized; and the system is flexible and high in adaptability.

Description

A kind of high low speed CAN bus compatible device and method of work thereof

Technical field

The present invention relates to a kind of field bus technique field, particularly a kind of high low speed CAN bus compatible device and method of work thereof.

Background technology

In Hyundai Motor, automobile-used electric equipment is along with people are little by little increasing improving constantly also of each functional requirement of automobile, from engine braking control, safety assurance system, instrument warning system, and improve car comfort and recreational and various effort that make, make the system of a complexity of automotive electrical system formation, and the CAN bussing technique connects simply with its hardware, good reliability, real-time and cost performance are widely used in automotive field.Can according to different requirements, automotive CAN network can be divided into high-speed CAN network, 2 speed grade of low speed CAN network.CAN network at a high speed is comprised of nodes such as ABS, AMT and EFIs; These ECU (Electrical Control Unit) numbers are few, real-time and stability requirement high, and it is the high-speed CAN network of 500Kbps that design forms transmission rate.Low speed CAN network, be comprised of numerous vehicle body motors and car light node, these ECU (Electrical Control Unit) quantity are many, the data numerous and complicated of transmission, accuracy, stability and requirement are better than real-time, and design composition transmission rate is that the middle low speed CAN network of 125Kbps is controlled.Because Shanghai Volkswagen market vehicle is more, automobile type configuration is different, and the CAN bus network of usefulness also is not quite similar, and communicates by letter normally with the GPS vehicle navigator for making automobile, can at lower cost, make things convenient for the client to install and use normally by the compatible CAN bus unit of this high low speed.

Summary of the invention

Goal of the invention of the present invention is: for the problem of above-mentioned existence, provide a kind of high low speed CAN bus compatible device.

The technical solution used in the present invention is such:

A kind of high low speed CAN bus compatible device is characterized in that: comprise the programmable processor of being responsible for bus initialization and data processing, CAN bus control unit, low speed CAN bus transceiver and high-speed CAN bus transceiver; Programmable processor is connected with the CAN bus control unit, and the CAN bus control unit is told two-route wire and is connected with low speed CAN bus transceiver with the high-speed CAN bus transceiver respectively; Connect by diverter switch between high-speed CAN bus transceiver and the low speed CAN bus transceiver, again by diverter switch access vehicle-mounted CAN network; Diverter switch directly is connected with programmable processor simultaneously.

Further, described programmable processor is preferably a 8 single-chip microcomputer TMP89FS60UG of TOSHIBA company; Described low speed CAN bus transceiver is preferably TJA1055; Described high-speed CAN bus transceiver is preferably MCP2551; Said CAN bus control unit is preferably MCP2515; Described diverter switch is preferably toggle switch.

A kind of method of work of high low speed CAN bus compatible device is characterized in that: may further comprise the steps:

A) according to different CAN bus network vehicles, toggle switch is switched to corresponding state, system's power-up initializing;

B) when CAN bus unit detection CAN data, according to the state that switch arranges, allow the programmable processor operation at a high speed or the subprogram of low speed;

C) send to serial ports by data on the parsing CAN bus network, and with result.

In sum, owing to adopted technique scheme, the invention has the beneficial effects as follows:

1, realizes the compatibility of high and low CAN bus network, unified the processing framework, made things convenient for installation, maintenance.

2, realized the unified processing of high and low CAN bus network data, system is more flexible, and adaptive capacity is better.

Description of drawings

Fig. 1 is the compatible CAN bus of high low speed gateway hardware principle block diagram;

Fig. 2 is the compatible CAN gateway software of high low speed flow chart.

Embodiment

Below in conjunction with accompanying drawing, the present invention is described in detail.

In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.

Embodiment 1:

As shown in Figure 1, a kind of high low speed CAN bus compatible device, comprise and adopt TOSHIBA a 8 single-chip microcomputer TMP89FS60UG of company as programmable processor, the initialization of the main CAN of being responsible for and data are processed, adopt TJA1055 as low speed CAN bus transceiver, adopt MCP2551 as the high-speed CAN bus transceiver, adopt MCP2515 as the CAN bus control unit; The MCP2515 programmable processor is connected with the MCP2515CAN bus control unit, MCP2515 CAN bus control unit is told two-route wire and is connected with TJA1055 low speed CAN bus transceiver respectively at MCP2551 high-speed CAN bus transceiver, connect by toggle switch between MCP2551 and the TJA1055, and by toggle switch access vehicle-mounted CAN network, toggle switch is connected with the TMP89FS60UG programmable processor simultaneously.

The beneficial effect of present embodiment is: realized the compatibility of high and low CAN bus network, unified the processing framework, made things convenient for installation, maintenance.

Embodiment 2:

As shown in Figure 2, a kind of method of work of high low speed CAN bus compatible device may further comprise the steps:

A) according to different CAN bus network vehicles, toggle switch is switched to corresponding state;

B) system's power-up initializing;

C) when CAN bus unit detection CAN data, according to the state that switch arranges, allow the programmable processor operation at a high speed or the subprogram of low speed;

D) send to serial ports by data on the parsing CAN bus network, and with result;

E) data are returned after sending successfully;

The beneficial effect of present embodiment is: realized unified processing of height CAN speed network data, system is more flexible, and adaptive capacity is better.

The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims (3)

1. one kind high low speed CAN bus compatible device is characterized in that: comprise the programmable processor of being responsible for bus initialization and data processing, CAN bus control unit, low speed CAN bus transceiver and high-speed CAN bus transceiver; Programmable processor is connected with the CAN bus control unit, and the CAN bus control unit is told two-route wire and is connected with low speed CAN bus transceiver with the high-speed CAN bus transceiver respectively; Connect by diverter switch between high-speed CAN bus transceiver and the low speed CAN bus transceiver, again by diverter switch access vehicle-mounted CAN network; Diverter switch directly is connected with programmable processor simultaneously.

2. high low speed CAN bus compatible device according to claim 1, it is characterized in that: described programmable processor is preferably a 8 single-chip microcomputer TMP89FS60UG of TOSHIBA company; Described low speed CAN bus transceiver is preferably TJA1055; Described high-speed CAN bus transceiver is preferably MCP2551; Said CAN bus control unit is preferably MCP2515; Described diverter switch is preferably toggle switch.

3. the method for work of a claim 1 or 2 described high low speed CAN bus compatible device is characterized in that: may further comprise the steps:

A) according to different CAN bus network vehicles, toggle switch is switched to corresponding state, system's power-up initializing;

B) when CAN bus unit detection CAN data, according to the state that switch arranges, allow the programmable processor operation at a high speed or the subprogram of low speed;

C) send to serial ports by data on the parsing CAN bus network, and with result.

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