BMS debugging CAN and whole vehicle CAN combined system

Abstract

The utility model discloses a BMS debugging CAN and whole vehicle CAN combined system, which relates to the technical field of battery management systems and comprises a battery management system module, a low-voltage power supply, an OBD module, a whole vehicle communication interface module and two relays. A whole vehicle CAN interface of the battery management system module is connected with a whole vehicle CAN interface on the whole vehicle communication interface module through a wire, the OBD module is connected with the whole vehicle CAN interface on the whole vehicle communication interface module through a wire, and the low-voltage power supply is connected with a constant electric interface on the whole vehicle communication interface module through a wire. According to the utility model, the debugging CAN of the vehicle BMS and the whole vehicle CAN are combined, and the debugging mode is started to read the battery debugging CAN data and perform calibration debugging operation on the battery, thereby reducing the work of debugging personnel frequently getting off the vehicle to perform calibration and the like in the testing process, improving the working efficiency, preventing the debugging personnel from flying to a cab from a battery debugging port, and reducing the debugging cost. And the driving test risk is reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery management system technology, and in particular to a system that merges the debugging CAN and the vehicle CAN of a BMS. Background Technology

[0002] With the increasing number of vehicle controllers on the market, the on-board diagnostic (OBD) ports of the vehicle can no longer meet the requirements for CAN debugging. This means that debugging or recording internal network messages requires connecting to the battery pack, which adds a lot of difficulties for on-site personnel. Recording internal network messages and calibration is very troublesome.

[0003] Currently, most CAN debugging connections are not connected to the vehicle's OBD via the debugging port of the PACK. External CAN boxes need to be connected to the debugging CAN via the debugging port. However, most PACKs are generally installed under the vehicle or on the chassis of a truck. When debugging and recording messages, the test personnel are usually in the cab. Therefore, the existing CAN debugging connections have the following problems:

[0004] 1. Pull the CAN bus from the test port into the cab. At this time, the exposed wiring harness under the vehicle may pose a risk when the vehicle is driven aggressively.

[0005] 2. When necessary, the debugging personnel can get out of the vehicle and connect to the debugging CAN bus. However, this method cannot record the dynamic debugging CAN data of the vehicle.

[0006] 3. When debugging the CAN-connected vehicle data recorder, this method can record messages, but when encountering operations that require calibration, it is still necessary to connect the debugging harness separately from the debugging port.

[0007] To address this, a system is proposed that integrates the BMS debugging CAN and the vehicle CAN. Utility Model Content

[0008] The purpose of this invention is to solve the problems mentioned in the background art and to propose a system for merging the BMS debugging CAN and the vehicle CAN.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A system merging the debugging CAN and vehicle CAN of a BMS includes a battery management system module, a low-voltage power supply, an OBD module, a vehicle communication interface module, and two relays. The vehicle CAN interface of the battery management system module is connected to the vehicle CAN interface on the vehicle communication interface module via a wire. The OBD module is also connected to the vehicle CAN interface on the vehicle communication interface module via a wire. The low-voltage power supply is connected to the constant power interface on the vehicle communication interface module via a wire. The constant power interface of the battery management system module is also connected to the constant power interface on the vehicle communication interface module via a wire. The H-terminal of the vehicle CAN interface and the H-terminal of the debugging CAN interface of the battery management system module are connected in series with the output terminal of one of the relays via a wire. The L-terminal of the vehicle CAN interface and the L-terminal of the debugging CAN interface of the battery management system module are connected in series with the output terminal of the other relay via a wire.

[0011] Preferably, the power supply drive port of the battery management system module is connected to the input terminals of two relays via wires, and the other input terminal of the two relays is connected to the negative terminal of the constant power interface on the vehicle communication interface module.

[0012] Preferably, the two relays are connected in parallel.

[0013] Compared with the prior art, the advantages of this utility model are:

[0014] This invention merges the vehicle BMS debugging CAN and the vehicle CAN. When the debugging mode is activated, the battery debugging CAN data can be read and the battery can be calibrated and debugged. This reduces the need for debugging personnel to frequently get out of the vehicle to perform calibration and other tasks during the testing process, thus improving work efficiency. It also avoids running wires from the battery debugging port to the driver's cab, reducing the risk of driving tests. Attached Figure Description

[0015] Figure 1 This is the electrical schematic diagram of this utility model.

[0016] Figure 2 This is a flowchart of the combined system workflow in this utility model. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0018] Reference Figure 1As shown, a system merging the debugging CAN and vehicle CAN of a BMS includes a Battery Management System (BMS), a low-voltage power supply, an OBD module, a vehicle communication interface module, and two relays. The vehicle CAN interface of the BMS is connected to the vehicle CAN interface on the vehicle communication interface module via a wire. The OBD module is connected to the vehicle CAN interface on the vehicle communication interface module via a wire. The low-voltage power supply is connected to the constant power interface on the vehicle communication interface module via a wire. The constant power interface of the BMS is connected to the constant power interface on the vehicle communication interface module via a wire. The H-terminal of the vehicle CAN interface and the H-terminal of the debugging CAN interface of the BMS are connected in series with the output terminal of one of the relays via a wire. The L-terminal of the vehicle CAN interface and the L-terminal of the debugging CAN interface of the BMS are connected in series with the output terminal of the other relay via a wire.

[0019] In this embodiment, the power supply drive port of the battery management system module is connected to the input terminals of two relays via wires, and the other input terminal of the two relays is connected to the negative terminal of the constant power interface on the vehicle communication interface module.

[0020] In this embodiment, the two relays are connected in parallel.

[0021] Working process and its principle:

[0022] Normal mode: The power supply drive port corresponding to the battery management system module is in a non-powered state. After the battery management system module wakes up from sleep mode, it defaults to normal mode regardless of whether it was in normal mode or debug mode before sleep.

[0023] Debug Mode: After the battery management system module is woken up, it switches to debug mode by sending a message. After receiving the message to switch debug mode, the battery management system module controls the power supply drive port to supply power. At this time, the two relays will close. After the relays close, the debug CAN is connected to the vehicle CAN. Then, through the vehicle communication port interface module, the OBD module can connect to the vehicle CAN and debug CAN, and can read the internal network messages and calibration of the battery management system module.

[0024] The system workflow for this merger is as follows: Figure 2 As shown, (Note: The message ID for switching debug mode is 12345678; sending 01000000000000000 indicates switching debug mode, while sending 000000000000000000 indicates switching normal mode.)

[0025] (1) Upon receiving the KL15 signal, the battery management system module is woken up, but the power supply driver port is not powered, maintaining normal mode.

[0026] (2) Whether a switch to debug mode message is received. If no message is received, maintain normal mode. If a message is received, power supply drive power supply and switch debug mode (if message is lost, maintain debug mode).

[0027] (3) Whether a switch to normal mode message is received. If no message is received, maintain debug mode. If a message is received, the power supply driver disconnects the power supply and switches to normal mode (if the message is lost, maintain normal mode).

[0028] (4) When the KL15 wake-up signal is disconnected in debug mode, the battery management system module enters the hibernation strategy. 100ms before the battery management system module goes into hibernation, the power supply driver disconnects the power supply and switches to normal mode, and the battery management system module goes into hibernation.

[0029] (5) When the KL15 wake-up signal is disconnected in normal mode, the battery management system module enters the hibernation strategy and the battery management system module goes into hibernation.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A system for merging BMS debugging CAN and vehicle CAN, characterized in that, The system includes a battery management system module, a low-voltage power supply, an OBD module, a vehicle communication interface module, and two relays. The vehicle CAN interface of the battery management system module is connected to the vehicle CAN interface on the vehicle communication interface module via a wire. The OBD module is connected to the vehicle CAN interface on the vehicle communication interface module via a wire. The low-voltage power supply is connected to the constant power interface on the vehicle communication interface module via a wire. The constant power interface of the battery management system module is connected to the constant power interface on the vehicle communication interface module via a wire. The H terminal of the vehicle CAN interface and the H terminal of the debug CAN interface of the battery management system module are connected in series with the output terminal of one of the relays via a wire. The L terminal of the vehicle CAN interface and the L terminal of the debug CAN interface of the battery management system module are connected in series with the output terminal of the other relay via a wire.

2. The system for merging BMS debugging CAN and vehicle CAN according to claim 1, characterized in that, The power supply drive port of the battery management system module is connected to the input terminals of two relays via wires, and the other input terminal of the two relays is connected to the negative terminal of the constant power interface on the vehicle communication interface module.

3. A system for merging BMS debugging CAN and vehicle CAN according to claim 2, characterized in that, The two relays are connected in parallel.

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