Digital electric vehicle bus communication system and control method thereof

Abstract

The invention discloses a digital electric vehicle bus communication system and a control method thereof. The system comprises a central control MCU, an instrument desk, an electronic switch, a controller, a GPS + Bluetooth module, a turning handle switch, a brake handle switch, a light assembly, a DC / DC power module and a loudspeaker, the turning handle switch, the brake handle switch, the light assembly, the DC / DC power module and the loudspeaker are directly connected and communicated with the central control MCU, and the instrument desk, the electronic switch, the controller and the PS + Bluetooth module are all connected and communicated with the central control MCU through an LIN bus. The beneficial effects of the invention are that each part is a digital part and is independent of each other, but the interfaces are the same; data interaction is carried out through a bus communication system, and the system has the characteristics of strong interference capability, simple wiring, high safety (low voltage), convenient maintenance and the like.

Description

Technical Field

[0001] The present invention relates to the technical field related to electric bus communication, and in particular to a digital electric vehicle bus communication system and a control method thereof. Background Art

[0002] Electric vehicle bus communication is an important component of the electric vehicle electrical system. It realizes the information transmission and command exchange between the various electronic control units (ECUs) inside the electric vehicle. In electric vehicles, due to the complexity and diversity of the electrical system, the various ECUs need to frequently exchange data and communicate. Due to the complexity and importance of electric vehicle bus communication, once a failure occurs, it may have a serious impact on the performance and safety of the entire vehicle. The transmission of various components of existing electric vehicles is analog signal transmission, and the connecting wiring harness is an ordinary wiring harness, which is easily interfered by interference sources. The original component wiring harness is a maximum of 7-core wires, and the original main wiring harness is a 13-core main wiring harness. Some analog signals are analog signals greater than 36V (such as wheel movement), which makes the system have a large safety hazard. Summary of the invention

[0003] The present invention aims to overcome the above-mentioned deficiencies in the prior art and provides a digital electric vehicle bus communication system with good anti-interference and high safety and a control method thereof.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A digital electric vehicle bus communication system includes a central control MCU, an instrument panel, an electronic switch, a controller, a GPS+Bluetooth module, a throttle switch, a brake switch, a lighting component, a DC / DC power module and a speaker. The throttle switch, brake switch, lighting component, DC / DC power module and the speaker are directly connected to the central control MCU for communication, and the instrument panel, the electronic switch, the controller and the PS+Bluetooth module are all connected to the central control MCU for communication via a LIN bus.

[0005] This system converts all analog signals related to the vehicle into digital signals for data exchange. All components in the system are digital components, each independent of each other, but with the same interface; data exchange is carried out through the bus communication system. Compared with the traditional analog electrical system, it has the characteristics of strong interference ability, simple wiring, high safety (all low voltage), and convenient maintenance.

[0006] Preferably, the central control MCU, instrument panel, electronic switch, controller, GPS+Bluetooth module, throttle switch, brake switch, lighting assembly, DC / DC power module and speaker are all digital components, wherein the data interaction adopts bus-type interaction, and the bus signal transmission is differential digital signal transmission, and the bus wiring harness adopts twisted pair wiring harness. Since all analog signals are converted into digital signals, the data interaction adopts bus-type interaction, which can reduce the original component wiring harness from 7 cores to 3 cores, and reduce the original 13-core main wiring harness to 6 cores; the bus signal transmission is differential digital signal transmission, and a twisted pair wiring harness is used, which effectively shields external interference; the original analog signal greater than 36V (such as wheel movement) is converted into a 5V / 3.3V digital signal by digital, which increases the safety of the system.

[0007] The present invention also provides a control method for a digital electric vehicle bus communication system, which specifically comprises the following steps: (1) When the system is powered on, the central control MCU collects signals from the directly connected components, such as the throttle switch, brake switch, lighting components, and horn; (2) The central control MCU patrol bus connects the instrument panel, electronic switches, controllers and PS+Bluetooth module signals; (3) Use an arbitration mechanism to determine whether the direct-connected components and bus-connected components are normal. If they are normal, proceed to the next step; otherwise, return to step (1). (4) A redundant mechanism is used to allow the central control MCU to issue patrol instructions to each bus connection component in turn, and determine whether each bus connection component responds within 50ms. If so, each bus connection component performs the corresponding operation; otherwise, repeat this step.

[0008] In this method, when the system is powered on, all components are inspected in a patrol manner. If the system / component has a fault, a fault code is reported; if it can be repaired, the system is restarted for repair; when the system is operating normally, the central control will patrol the bus components. When a component is offline or fails, the central control will suspend the component during this patrol cycle so as not to affect the normal operation of other components and the vehicle.

[0009] Preferably, in step (1), the specific operation method is: (11) The central control MCU samples the throttle signal in the throttle switch through the A / D sampling module; (12) Determine whether the throttle signal is within 0.8±0.1V; if so, check the next component; otherwise, issue a throttle fault code; (13) Detect the horn signal, the brake handle signal in the brake handle switch, and the light signal in the light component through the I / O port; if there is a response signal, execute the corresponding function; otherwise, repeat this step to continue the detection.

[0010] Preferably, in step (2), the specific operation method is: (21) The central control MCU sends a query to the controller and monitors whether the controller responds within 100ms. If it responds, the electronic switch is patrolled; otherwise, a controller fault code is issued. (22) The central control MCU sends a command to query the electronic switch and monitors whether the electronic switch responds within 100ms; if it responds, it patrols the instrument panel; otherwise, it issues an electronic switch fault code; (23) The central control MCU sends a command to query the instrument panel and monitors whether the instrument panel responds within 100ms. If it responds, the GPS+Bluetooth module is patrolled; otherwise, a fault code of the instrument panel is issued. (24) The central control MCU sends a command to query the GPS+Bluetooth module and monitors whether the GPS+Bluetooth module responds within 100ms. If it responds, the controller is patrolled; otherwise, a GPS+Bluetooth module fault code is issued.

[0011] Preferably, in step (3), the operation method of the arbitration mechanism is: (31) If it is determined that only the controller and the throttle function normally, and the number of normal states of other components is ≥ 0, the vehicle is allowed to run at a maximum speed of 15 km; (32) If it is determined that there is a controller or throttle malfunction, the vehicle will not be able to drive the motor; (33) If all components are judged to be normal, the vehicle is allowed to operate normally.

[0012] Preferably, in step (4), the operation method of the redundancy mechanism is: (41) If it is determined that the vehicle cannot drive the motor as long as there is a controller or throttle function failure, the redundancy mechanism cannot be entered; (42) If the controller and the throttle are judged to be functioning normally, and the number of normal states of other components is ≥ 0; for direct-connected component failures, a fault code is reported while maintaining real-time sampling; for bus-connected component failures, a fault code is reported and the central control MCU generates a virtual fault component to ensure that the vehicle can continue to operate even when there is a component failure.

[0013] The beneficial effects of the present invention are as follows: each component is a digital component, each is independent of each other, but has the same interface; data interaction is carried out through a bus communication system, and it has the characteristics of strong interference ability, simple wiring, high safety (all low voltage), and convenient maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a system structure block diagram of the present invention; Figure 2 It is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0015] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0016] like Figure 1 In the described embodiment, a digital electric vehicle bus communication system includes a central control MCU, an instrument panel, an electronic switch, a controller, a GPS+Bluetooth module, a throttle switch, a brake switch, a lighting component, a DC / DC power module and a speaker. The throttle switch, the brake switch, the lighting component, the DC / DC power module and the speaker are directly connected to the central control MCU for communication, and the instrument panel, the electronic switch, the controller and the PS+Bluetooth module are all connected to the central control MCU for communication via the LIN bus. The central control MCU, the instrument panel, the electronic switch, the controller, the GPS+Bluetooth module, the throttle switch, the brake switch, the lighting component, the DC / DC power module and the speaker are all digital components, wherein the data interaction mode adopts a bus-type interaction mode, and the bus signal transmission is a differential digital signal transmission, and the bus wiring harness adopts a twisted pair wiring harness.

[0017] Among them, the electric vehicle instrument panel is an important device for displaying the vehicle's operating status and parameters, usually including a speedometer, a power meter, an odometer, etc. It can display the current speed, remaining power, mileage and other information of the electric vehicle in real time, helping the driver understand the vehicle status and make reasonable driving decisions. The electronic switch is a switch device used to control various electronic devices on the electric vehicle. It turns on and off the lights, horns and other devices on the electric vehicle through circuit control. The central control MCU refers to the overall control system or central control unit of the electric vehicle. The central control MCU of the electric vehicle is responsible for coordinating and managing the work of various electronic components on the electric vehicle. It includes the integrated management of components such as controllers, instrument panels, electronic switches, as well as advanced functions such as vehicle communication and fault diagnosis. The electric vehicle controller is an important component in the electric vehicle. It controls the start, operation, advance and retreat, speed, stop and other electronic devices of the electric vehicle. The controller can be applied to various brushless electric vehicle motors through a unique current control algorithm, which improves the universal adaptability of the electric vehicle controller.

[0018] Since all analog signals are converted into digital signals, the data interaction adopts bus interaction, which can reduce the original component wiring harness from 7 cores to 3 cores, and reduce the original 13-core main wiring harness to 6 cores. The bus signal transmission is differential digital signal transmission, and the twisted pair harness is used to effectively shield external interference. The original analog signal greater than 36V (such as wheel movement) is converted into a 5V / 3.3V digital signal through digital, which increases the safety of the system.

[0019] like Figure 2 As shown, the present invention also provides a control method for a digital electric vehicle bus communication system, which specifically includes the following steps: (1) When the system is powered on, the central control MCU collects signals from the directly connected components, such as the throttle switch, brake switch, lighting components, and horn. The specific operation method is as follows: (11) The central control MCU samples the throttle signal in the throttle switch through the A / D sampling module; (12) Determine whether the throttle signal is within 0.8±0.1V; if so, check the next component; otherwise, issue a throttle fault code; (13) Detect the horn signal, the brake handle signal in the brake handle switch, and the light signal in the light assembly through the I / O port; if there is a response signal, execute the corresponding function; otherwise, repeat this step to continue the detection; (2) The central control MCU patrol bus connects the instrument panel, electronic switch, controller and PS+Bluetooth module signals; the specific operation method is: (21) The central control MCU sends a query to the controller and monitors whether the controller responds within 100ms. If it responds, the electronic switch is patrolled; otherwise, a controller fault code is issued. (22) The central control MCU sends a command to query the electronic switch and monitors whether the electronic switch responds within 100ms; if it responds, it patrols the instrument panel; otherwise, it issues an electronic switch fault code; (23) The central control MCU sends a command to query the instrument panel and monitors whether the instrument panel responds within 100ms. If it responds, the GPS+Bluetooth module is patrolled; otherwise, a fault code of the instrument panel is issued. (24) The central control MCU sends a command to query the GPS+Bluetooth module and monitors whether the GPS+Bluetooth module responds within 100ms; if it responds, the controller is patrolled; otherwise, a GPS+Bluetooth module fault code is issued; (3) An arbitration mechanism is used to determine whether the direct-connected components and the bus-connected components are normal. If they are normal, the next step is performed; otherwise, the process returns to step (1). The operation method of the arbitration mechanism is as follows: (31) If it is determined that only the controller and the throttle function normally, and the number of normal states of other components is ≥ 0, the vehicle is allowed to run at a maximum speed of 15 km; (32) If it is determined that there is a controller or throttle malfunction, the vehicle will not be able to drive the motor; (33) If all components are judged to be normal, the vehicle is allowed to operate normally; (4) A redundant mechanism is used to allow the central control MCU to issue patrol instructions to each bus connection component in turn, and determine whether each bus connection component responds within 50ms. If it responds, each bus connection component performs the corresponding operation; otherwise, repeat the step; the operation method of the redundant mechanism is: (41) If it is determined that the vehicle cannot drive the motor as long as there is a controller or throttle function failure, the redundancy mechanism cannot be entered; (42) If the controller and the throttle are judged to be functioning normally, and the number of normal states of other components is ≥ 0; for direct-connected component failures, a fault code is reported while maintaining real-time sampling; for bus-connected component failures, a fault code is reported and the central control MCU generates a virtual fault component to ensure that the vehicle can continue to operate even when there is a component failure.

[0020] When the system is powered on, all components will be inspected in a round-robin manner. If the system / component is faulty, a fault code will be reported; if it can be repaired, the system will restart and repair. When the system is running normally, the central control MCU will patrol the bus components. When a component is offline or faulty, the central control MCU will suspend the component during this patrol cycle, so as not to affect the normal operation of other components and the vehicle.

[0021] This system converts all analog signals related to the vehicle into digital signals for data exchange. Compared with the analog switches of conventional systems, each component uses the central control MCU to collect relevant signals and convert the signals into a digital solution of the bus protocol. Through protocol communication, the functions of the digital components can be customized, that is, each component in the system is a digital component, each independent of each other, but with the same interface; data exchange is carried out through the bus communication system (with arbitration and redundancy mechanisms). Compared with the traditional analog electrical system, it has the characteristics of strong interference ability, simple wiring, high safety (all low voltage), and convenient maintenance.

Claims

1. A digital electric vehicle bus communication system, characterized in that: It includes a central control MCU, an instrument panel, an electronic switch, a controller, a GPS+Bluetooth module, a throttle switch, a brake switch, a lighting component, a DC / DC power supply module and a speaker. The throttle switch, brake switch, lighting component, DC / DC power supply module and the speaker are directly connected to the central control MCU for communication. The instrument panel, electronic switch, controller and PS+Bluetooth module are all connected to the central control MCU for communication via a LIN bus.

2. A digital electric vehicle bus communication system according to claim 1, characterized in that: The central control MCU, instrument panel, electronic switch, controller, GPS+Bluetooth module, throttle switch, brake switch, lighting assembly, DC / DC power supply module and speaker are all digital components, among which the data interaction method adopts bus interaction method, and the bus signal transmission is differential digital signal transmission, and the bus wiring harness adopts twisted pair wiring harness.

3. A control method for a digital electric vehicle bus communication system according to claim 1 or 2, characterized in that: The specific steps include: (1) When the system is powered on, the central control MCU collects signals from the directly connected components, such as the throttle switch, brake switch, lighting components, and horn; (2) The central control MCU patrol bus connects the instrument panel, electronic switches, controllers and PS+Bluetooth module signals; (3) Use an arbitration mechanism to determine whether the direct-connected components and bus-connected components are normal. If they are normal, proceed to the next step; otherwise, return to step (1). (4) A redundant mechanism is used to allow the central control MCU to issue patrol instructions to each bus connection component in turn, and determine whether each bus connection component responds within 50ms. If so, each bus connection component performs the corresponding operation; otherwise, repeat this step.

4. The control method of a digital electric vehicle bus communication system according to claim 3 is characterized in that In step (1), the specific operation method is: (11) The central control MCU samples the throttle signal in the throttle switch through the A / D sampling module; (12) Determine whether the throttle signal is within 0.8±0.1V; if so, check the next component; otherwise, issue a throttle fault code; (13) Detect the horn signal, the brake handle signal in the brake handle switch, and the light signal in the light component through the I / O port; if there is a response signal, execute the corresponding function; otherwise, repeat this step to continue the detection.

5. The control method of a digital electric vehicle bus communication system according to claim 3 is characterized in that: In step (2), the specific operation method is: (21) The central control MCU sends a query to the controller and monitors whether the controller responds within 100ms. If it responds, the electronic switch is patrolled; otherwise, a controller fault code is issued. (22) The central control MCU sends a command to query the electronic switch and monitors whether the electronic switch responds within 100ms; if it responds, it patrols the instrument panel; otherwise, it issues an electronic switch fault code; (23) The central control MCU sends a command to query the instrument panel and monitors whether the instrument panel responds within 100ms. If it responds, the GPS+Bluetooth module is patrolled; otherwise, a fault code of the instrument panel is issued. (24) The central control MCU sends a command to query the GPS+Bluetooth module and monitors whether the GPS+Bluetooth module responds within 100ms. If it responds, the controller is patrolled; otherwise, a GPS+Bluetooth module fault code is issued.

6. The control method of a digital electric vehicle bus communication system according to claim 3 is characterized in that In step (3), the operation method of the arbitration mechanism is: (31) If it is determined that only the controller and the throttle function normally, and the number of normal states of other components is ≥ 0, the vehicle is allowed to run at a maximum speed of 15 km; (32) If it is determined that there is a controller or throttle malfunction, the vehicle will not be able to drive the motor; (33) If all components are judged to be normal, the vehicle is allowed to operate normally.

7. The control method of a digital electric vehicle bus communication system according to claim 3 is characterized in that: In step (4), the operation method of the redundancy mechanism is: (41) If it is determined that the vehicle cannot drive the motor as long as there is a controller or throttle function failure, the redundancy mechanism cannot be entered; (42) If the controller and the throttle are judged to be functioning normally, and the number of normal states of other components is ≥ 0; for direct-connected component failures, a fault code is reported while maintaining real-time sampling; for bus-connected component failures, a fault code is reported and the central control MCU generates a virtual fault component to ensure that the vehicle can continue to operate even when there is a component failure.

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