A Real-Time Control Method for Powertrain Systems of New Energy Vehicles

Abstract

The present invention relates to the field of automotive electronics, and in particular to a real-time control method for a new energy vehicle power transmission system. The present invention uses multiple slave station real-time control devices in series, and after the series connection, the final data is input into the master station, and the n slave station data are connected through uplink and downlink transmission. When multiple slave stations work with the master station, the slave station communication protocol and communication mode are selected. After the slave station configuration is completed according to the situation, the slave station system has the basic conditions for communicating with the master station. Therefore, the method of the present invention can quickly increase or decrease the amount of data collection and control according to demand, and is suitable for the design and development of the whole vehicle and power transmission system.

Description

Technical Field

[0001] The present invention relates to the field of automotive electronics, and in particular to a real-time control method for a power transmission system of a new energy vehicle. Background Art

[0002] At present, pure electric vehicles among new energy vehicles still have many problems such as slow speed and short driving range, which are mainly solved by improving the efficiency of the drive motor in the power system and improving the performance of the on-board battery. In the process of vehicle development, it is necessary to monitor the running status of the vehicle in real time, diagnose faults, continuously record the long-term test running data of the vehicle, and conduct offline analysis.

[0003] At present, pure electric vehicles in new energy vehicles still have many problems such as slow speed and short cruising range, which are mainly solved by improving the efficiency of the drive motor in the power system and improving the performance of the on-board battery. For example, the Chinese patent "Real-time control method, storage medium, controller and system for dual drive motors of new energy vehicles" (application number 202110442842.2) discloses obtaining drive motor control specified information from an external information source; extracting the first type of information and the second type of information in the drive motor control specified information to obtain the road friction coefficient, and calculating the vehicle driving force in real time; calculating the initial front and rear axle driving force in real time according to the vehicle driving force; calculating the first initial vehicle driving efficiency in real time according to the initial front and rear axle driving force, the driver's required driving force and the motor efficiency correction coefficient; extracting the third type of information in the drive motor control specified information to judge the vehicle motion state in real time; calculating the front and rear axle braking force or calculating the front and rear axle driving force according to the vehicle motion state. The present invention can obtain the drive motor control specified information from an external information source to adjust the drive output of the dual drive motor of the new energy vehicle in real time, improve the safety and energy saving of the vehicle, and is conducive to energy saving and environmental protection. However, the patent method is difficult to collect rapidly changing data during the development of the whole vehicle, and cannot improve the data collection and analysis capabilities of the whole vehicle.

[0004] During the development of the vehicle, it is necessary to monitor the vehicle's operating status in real time, diagnose faults, continuously record the vehicle's long-term test operation data, and perform offline analysis. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a real-time control method for a new energy vehicle power transmission system. In the present invention, multiple slave station real-time control devices are used in series, and the final data is input into the master station after the series connection, and the n slave station data are connected through uplink and downlink transmission. When multiple slave stations work with the master station, the slave station communication protocol and communication mode are selected. After the slave station configuration is completed according to the situation, the slave station system has the basic conditions for communicating with the master station. Therefore, the method of the present invention can quickly increase or decrease the amount of data collection and control according to demand, and is suitable for the design and development of the whole vehicle and power transmission system.

[0006] The technical solution of the present invention is: a real-time control method for a new energy vehicle power transmission system, including a master station and a slave station, the master station is implemented by an industrial computer integrated with an Ethernet interface, the master station system module includes an application interface module, a master station module, and a network card device driver module, the master station module includes a dedicated Ethernet device driver, a master station SOME, and a character device interface, wherein the master station SOME includes a network card device interface, and the user layer drives the master station module through application programming to realize the driving of the network card device, thereby realizing the master station receiving or sending information; it is characterized in that: multiple slave station real-time control devices are used in series, and after the series connection, the final data is input into the master station, and the n slave station data are connected through uplink and downlink transmission. When multiple slave stations work with the master station, the slave station communication protocol and communication mode are selected, and after the slave station configuration is completed according to the situation, the slave station system has the basic conditions for communicating with the master station.

[0007] According to the real-time control method of the power transmission system of a new energy vehicle as described above, it is characterized in that: the master and slave stations work together to complete the reading and writing of data and realize the communication between the master and slave stations. The master station uses a general Ethernet device to send and receive information, and the slave station uses an embedded system and the aforementioned developed data acquisition device to process data.

[0008] According to the real-time control method of a new energy vehicle power transmission system as described above, it is characterized in that the slave controller is an ET1100 (AX58100LT) chip, an AM3359 chip or an FPGA device.

[0009] According to the real-time control method of the power transmission system of a new energy vehicle as described above, it is characterized in that the slave microprocessor is an STM32 single-chip microcomputer, and the data transmission between the slave microprocessor and the slave controller adopts the SPI mode.

[0010] According to the real-time control method of a new energy vehicle power transmission system as described above, it is characterized in that: the sensor and the control device are connected to STM32 (GD32F407ZGT6) through a data acquisition device, and the STM32 is directly controlled according to the master station command input by the slave station controller.

[0011] According to the real-time control method of the power transmission system of a new energy vehicle as described above, it is characterized in that: the slave station initializes the master control device and the slave station controller, then enters the communication main loop to realize data communication with the master station.

[0012] The beneficial effects of the present invention are: utilizing industrial field Internet Ethercat, FPGA and other technologies, adopting the master-slave mode of EtherCAT network structure, to develop a real-time control system suitable for high-speed measurement and control devices of power and transmission systems of new energy vehicles, which can replace existing imported products. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the EtherCAT operating principle diagram of the present invention.

[0014] Figure 2 Master station system structure diagram.

[0015] Figure 3 Slave station structure diagram.

[0016] Figure 4 Slave software flow chart. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0018] like Figure 1 As shown, a real-time control method for a new energy vehicle power transmission system of the present invention includes an EtherCAT master station and a slave station. The present invention adopts an EtherCAT network structure in master-slave mode. The entire system is composed of a master station and a slave station. The master and slave stations work together to complete the reading and writing of data and realize communication between the master and slave stations. The master station uses a general Ethernet device, i.e., an industrial computer, to send and receive information, and the slave station uses an embedded system and the aforementioned developed data acquisition equipment to process data. During the operation of the EtherCAT system, the master station will send messages, and the slave stations in the network will match and read and write the messages sent by the master station one by one, and then the messages processed by the slave stations will be returned to the master station. The operating principle diagram of the present invention is shown in FIG. Figure 1 shown.

[0019] like Figure 2 As shown in the figure, the EtherCAT master station is implemented by an industrial computer with an integrated Ethernet interface. The master station system module includes an application interface module, a master station module, and a network card device driver module. Figure 2 As shown, the master station module includes a dedicated Ethernet device driver, a master station SOME, and a character device interface, wherein the master station SOME includes a network card device interface. The user layer writes a driver for the master station module through an application program to drive the network card device, thereby realizing the master station receiving or sending information.

[0020] The slave controller (ESC) of the present invention selects chips or FPGA devices such as ET1100 and AM3359, and the slave microprocessor selects a powerful STM32 single-chip microcomputer. The data transmission between the slave microprocessor and the slave controller adopts the SPI mode. The sensor and the control device are connected to the STM32 through the data acquisition device, and the STM32 is directly controlled according to the master station command input by the slave controller. The overall structure of the slave module is as follows Figure 3 shown.

[0021] The present invention uses multiple slave station real-time control devices in series, such as Figure 2 As shown, after the series connection, the final data is input into the master station, that is, the n slave station data are connected through uplink and downlink transmission, so that the automobile power transmission system can be designed in modules, making the subsystem circuit design and control simpler and more convenient, and adding functions is also easier. Only new slave stations need to be added to complete the system reorganization setting. This is suitable for the development of new energy vehicle power systems, that is, a fast modular combination change design scheme can be used, and it can also be directly applied to automobile power systems. When multiple slave stations work with the master station, the slave station communication protocol and communication mode are selected, and after the slave station configuration is completed according to the situation, the slave station system has the basic conditions for communication with the master station. After the slave station initializes the main control device and the slave station controller, it can enter the communication main loop to realize data communication with the master station.

[0022] The slave station communication protocol and communication mode of the present invention, after completing the slave station configuration according to the situation, the slave station system has the basic conditions for communicating with the master station. The software implementation process is to initialize the microprocessor STM32 and the slave station controller, and then enter the communication main loop to realize data communication with the master station. The main process of the slave station software is as follows Figure 4 shown.

[0023] The present invention is based on the open source software SOEM as the EtherCAT soft master station, and the software is transplanted onto the operating system to realize the EtherCAT master station protocol stack. EtherCAT Ethernet technology is a communication system based on the master-slave station structure. The master station controls the sending and receiving of slave station data, and the slave station only needs to process the message data that matches its own addressing. The functions of the master station are realized by software, such as kernel, scheduling management, and logical space mapping.

[0024] The EtherCAT slave station protocol communication state machine of the present invention is maintained in the slave station application layer, and the master station realizes the switching of the slave station state machine through the interaction of the slave station application layer control register and the state register.

Claims

1. A real-time control method for a new energy vehicle power transmission system, comprising a master station and a slave station, wherein the master station is implemented by an industrial computer integrated with an Ethernet interface, the master station system module comprises an application interface module, a master station module, and a network card device driver module, the master station module comprises a dedicated Ethernet device driver, a master station SOME, and a character device interface, wherein the master station SOME comprises a network card device interface, and the user layer writes and drives the master station module through an application program to realize the driving of the network card device, thereby realizing the receiving or sending of information by the master station; the characteristics are: Multiple slave real-time control devices are used in series. After the series connection, the final data is input into the master station. The n slave data are connected through uplink and downlink transmission. When multiple slaves work with the master station, the slave communication protocol and communication mode are selected. After the slave configuration is completed according to the situation, the slave system has the basic conditions for communicating with the master station.

2. A real-time control method for a new energy vehicle power transmission system according to claim 1, characterized in that: The master and slave stations work together to complete the reading and writing of data and realize the communication between the master and slave stations. The master station uses a general Ethernet device to send and receive information, and the slave station uses an embedded system and the previously developed data acquisition device to process data.

3. The real-time control method of a new energy vehicle power transmission system according to claim 1 is characterized in that: The slave controller is an ET1100 chip, an AM3359 chip or an FPGA device.

4. A real-time control method for a new energy vehicle power transmission system according to claim 1, characterized in that: The slave microprocessor is an STM32 single-chip microcomputer, and the data transmission between the slave microprocessor and the slave controller adopts the SPI method.

5. The real-time control method of a new energy vehicle power transmission system according to claim 1, characterized in that: The sensors and control devices are connected to the STM32 through the data acquisition equipment, and are directly controlled by the STM32 according to the master station commands input by the slave station controller.

6. A real-time control method for a new energy vehicle power transmission system according to claim 1, characterized in that: The slave station initializes the master control device and the slave station controller, then enters the communication main loop to realize data communication with the master station.

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