Current calibration tool for electric power steering controller

Abstract

The utility model provides a current calibration tool used for an electric power steering controller. The current calibration tool comprises a master control MCU, a temperature sampling module, a phase line current monitoring module, a communication module and a power supply module. The phase line current monitoring module is electrically connected with a phase line between the motor and the electric power-assisted steering controller, the main control MCU is electrically connected with the phase line current monitoring module and the temperature sampling module, and the main control MCU is electrically connected with the electric power-assisted steering controller and the upper computer through the communication module. The power supply module is electrically connected with the master control MCU, the temperature sampling module, the phase line current monitoring module and the communication module. According to the utility model, the resistor and the operational amplifier of the electric power steering controller can be accurately calibrated, the consistency of the resistor and the operational amplifier can be improved, the problem of poor consistency between controllers produced in batches in the prior art can be solved, multiple calibration can be carried out at different current segments, the non-linear phenomenon can be avoided, and the reliability of the electric power steering controller can be improved. And the performance and the production efficiency of the controller are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of calibration tooling, in particular to a current calibration tooling for an electric power steering controller. Background Art

[0002] An electric power steering system uses an electric motor to provide assistive torque to help the driver turn the steering wheel. This system is typically controlled by an electric power steering controller, which detects the torque applied by the driver to the steering wheel and the vehicle's speed to calculate the required assistive torque. This controller then generates torque through the motor, thereby reducing the driver's steering burden. In this process, the performance of the electric power steering controller is crucial, as it directly affects the performance of the power steering system and the driving experience. Various factors, such as component discreteness and temperature variations, can cause differences in the controller's performance at different operating currents. Therefore, current calibration is necessary to ensure that the controller outputs accurate control signals at all operating currents. Therefore, current calibration is a crucial step in the electric power steering controller.

[0003] Existing current calibration primarily involves a one-time full-range calibration, performing a complete calibration within the controller's operating current range. While simple and easy, this approach can result in poor calibration accuracy in certain current segments due to the wide current range. In particular, nonlinearity can occur in certain current segments, impacting controller performance. Furthermore, existing calibration methods require a high level of expertise from engineers, requiring extensive experience and knowledge, which undoubtedly increases labor costs for companies. Furthermore, the existing calibration process is cumbersome and inefficient, making it unsuitable for large-scale production. Utility Model Content

[0004] The present application provides a current calibration tool for an electric power steering controller to solve at least one problem in the above-mentioned prior art.

[0005] According to an embodiment of the present application, a current calibration tool for an electric power steering controller is provided, including: a main control MCU (Micro Controller Unit), a temperature sampling module, a phase line current monitoring module, a communication module and a power supply module; the phase line current monitoring module is electrically connected to the phase line between the motor and the electric power steering controller, the temperature sampling module is used to detect the operating temperature of the phase line current monitoring module, the main control MCU is electrically connected to the phase line current monitoring module and the temperature sampling module, and the main control MCU is electrically connected to the electric power steering controller and the host computer through the communication module, and the power supply module is electrically connected to the main control MCU, the temperature sampling module, the phase line current monitoring module and the communication module.

[0006] In some embodiments of the present application, it further includes: a connector module, and the phase current monitoring module is electrically connected to the phase line between the motor and the electric power steering controller through two of the connector modules.

[0007] In some embodiments of the present application, it further includes: a display and control module, the display and control module is electrically connected to the main control MCU through the communication module, and the power supply module is electrically connected to the display and control module.

[0008] In some embodiments of the present application, SPI communication is adopted between the communication module and the display and control module.

[0009] In some embodiments of the present application, the power supply module uses a battery.

[0010] In some embodiments of the present application, the power supply module includes an AD / DC converter and a DC / DC converter.

[0011] In some embodiments of the present application, the display and control module adopts a touch liquid crystal display screen.

[0012] In some embodiments of the present application, the communication module and the host computer are connected using a CAN (Controller Area Network) bus, an RS232 bus and / or an RS485 bus.

[0013] In some embodiments of the present application, the communication module communicates with the main control MCU using SPI (Serial Peripheral Interface).

[0014] The beneficial effects of the embodiments of the present application are as follows:

[0015] This current calibration tool can accurately calibrate the resistance and operational amplifier of the electric power steering controller, improving its consistency. It solves the problem of poor consistency between mass-produced controllers in the existing technology. It can also perform multiple calibrations in different current segments to achieve segmented current calibration, avoid nonlinear phenomena, and improve the performance and production efficiency of the controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic block diagram of a current calibration tool for an electric power steering controller provided in an embodiment of the present application;

[0018] Explanation of the reference numerals: 1 is the main control MCU, 2 is the temperature sampling module, 3 is the phase current monitoring module, 4 is the communication module, 5 is the power supply module, 6 is the motor, 7 is the electric power steering controller, 8 is the connector module, and 9 is the display and control module. DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this utility model.

[0020] It should be noted that the terms "including," "having," and any variations thereof in the embodiments and drawings of this application are intended to cover non-exclusive inclusions. For example, "including" is not limited to the listed structures, but may optionally include structures not listed, or may optionally include other components inherent to those structures.

[0021] This application discloses a current calibration tool for an electric power steering controller. This tool addresses existing technical issues, such as poor consistency between mass-produced electric power steering controllers, low calibration accuracy, potential nonlinearity in certain current ranges, high professional requirements and labor costs, and a cumbersome and inefficient calibration process that cannot meet the needs of large-scale production. These issues are described in detail below.

[0022] Figure 1FIG. 1 shows a current calibration tool for an electric power steering controller according to an embodiment of the present application. Figure 1 As shown, the current calibration tooling mainly includes: a main control MCU1, a temperature sampling module 2, a phase current monitoring module 3, a communication module 4 and a power supply module 5. Specifically, the phase current monitoring module 3 is electrically connected to the phase line between the motor 6 and the electric power steering controller 7. The temperature sampling module 2 is used to detect the operating temperature of the phase current monitoring module 3. The main control MCU1 is electrically connected to the phase current monitoring module 3 and the temperature sampling module 2 respectively. The main control MCU1 is electrically connected to the electric power steering controller 7 and the host computer (not shown in the figure) respectively through the communication module 4. The power supply module 5 is electrically connected to the main control MCU1, the temperature sampling module 2, the phase current monitoring module 3 and the communication module 4 respectively.

[0023] Among them, the power supply module 5 is used to provide voltage to the main control MCU1, the temperature sampling module 2, the phase current monitoring module 3 and the communication module 4 to enable the normal operation of other modules; the communication module 4 is used for communication between the main control MCU1 and the host computer, the electric power steering controller 7 and other devices or modules; the phase current monitoring module 3 is used to collect the current signal between the motor 6 and the electric power steering controller 7, and convert the collected current signal into a voltage signal, and input it into the main control MCU1; the temperature sampling module 2 is used to detect the working temperature of the phase current monitoring module 3 and transmit it to the main control MCU1; the main control MCU1 is used to control other modules, which collects the phase current between the motor 6 and the electric power steering controller 7 through the phase current monitoring module 3, and collects the temperature of the phase current monitoring module 3 through the temperature sampling module 2, and collects the actual current value of the electric power steering controller 7 at the same time, so as to perform calibration compensation based on the collected phase current, actual current value and temperature, thereby realizing semi-automatic calibration without the participation of highly professional engineers, improving production efficiency and reducing labor costs.

[0024] In some specific embodiments, the power supply module 5 may use a battery to convert the 12V voltage input into 5V or 3.3V voltages for use by each module. In other specific embodiments, the power supply module 5 may include an AD / DC converter and a DC / DC converter. The AD / DC converter (a device that converts AC to DC) converts the 220V AC voltage into a 12V DC voltage, and the DC / DC converter (a device that converts DC to DC) converts the 12V DC voltage into 5V or 3.3V DC voltage for use by each module.

[0025] In a specific embodiment, the main control MCU1 can adopt the R7F701371EABG model microcontroller of Renesas, the temperature sampling module 2 can adopt the NCU15XH103F6SRC model NTC of Murata, the phase line current monitoring module 3 can adopt the ACS781 model current sampling chip of Allegro, or a module combining the AD8418 model op amp of ANALOG and the WSK1216L5000FEA model resistor of VISHAY, while the communication module 4 can adopt the TJA1145ATK / FD model CAN communication chip of NXP, and the power supply module 5 adopts the MC33FS4503CAE model power management chip of NXP.

[0026] In the embodiment of the present application, the current calibration tool further includes a connector module 8. Specifically, the phase current monitoring module 3 is electrically connected to the phase lines between the motor 6 and the electric power steering controller 7 via two connector modules 8. In other words, the current calibration tool can be installed and tested using the two connector modules 8, making it easy to use.

[0027] In addition, the current calibration tool also includes: a display and control module 9. Specifically, the display and control module 9 is electrically connected to the main control MCU1 through the communication module 4, and the execution instructions (for example, current calibration execution, start, pause, etc.) are transmitted to the main control MCU1 through the display and control module 9. At the same time, the main control MCU1 transmits the test results and the calibration compensation scheme to the display and control module 9 for display. The power supply module 5 is electrically connected to the display and control module 9 to provide voltage to the display and control module 9. Among them, the test results in the embodiment of the present application refer to the current value tested by the current calibration tool and the current value of the electric power steering controller 7, and the calibration compensation scheme refers to algorithmic compensation based on the error of the two values ​​in the test results, so that the electric power steering controller 7 can output accurate control signals under different working currents through the calibration compensation scheme.

[0028] In some specific embodiments, the display and control module 9 uses a touch-sensitive liquid crystal display screen, so that current calibration settings are performed through the touch screen, and the input instructions are transmitted to the main control MCU1.

[0029] In some specific embodiments, the communication module 4 is connected to the host computer via a CAN bus, RS232 bus, and / or RS485 bus. The main control MCU1 receives test instructions via the communication module 4 and the CAN bus and feeds back the status of the instruction execution and test results to the host computer. The communication module 4 uses SPI communication with tooling modules such as the display and control module 9 and the main control MCU1 to ensure information transmission speed and security. The work instructions input through the display and control module 9 are transmitted to the main control MCU1, and the test process and results obtained by the main control MCU1 are displayed via the display and control module 9.

[0030] The above is an introduction to the various components of the current calibration tooling for the electric power steering controller provided in this embodiment and the connection relationship between them. Figure 1 , the working principle of the current calibration tooling for the electric power steering controller is described in detail.

[0031] When the current calibration tool is working, it is installed and connected to the phase line between the motor 6 and the electric power steering controller 7 through two connector modules 8. After installation, the current calibration range of the current calibration tool (for example, 0-120A) can be set through the display and control module 9, and then the calibration program is started by the main control MCU1. Specifically, after the target current is given, the phase current monitoring module 3 and the electric power steering controller 7 respectively collect current data to obtain the current value detected by the current calibration tool and the current value of the electric power steering controller 7. The main control MCU1 then compares the two current values ​​and performs difference compensation at the temperature measured by the temperature sampling module 2. The difference compensation algorithm is burned into the electric power steering controller 7, and the current value is re-measured by the current calibration tool. If the current value detected by the current calibration tool is consistent with the current value of the electric power steering controller 7, it is considered qualified, otherwise the calibration needs to be repeated. Among them, the difference compensation algorithm in this process can be automatically calculated and modified by an automated calibration program, thereby improving production efficiency. However, it should be noted and understood that the calibration program automatically generates the difference compensation algorithm and the controller burning algorithm, which is the entire current calibration process, and not a limitation of the current calibration tooling.

[0032] Using this current calibration tool, you can also adopt the segmented current calibration method, that is, perform multiple calibrations in different current segments. For example, 0-120A can be divided into three segments: 0-40A, 40-80A, and 80-120A for calibration. In addition, the three-phase current can be calibrated in segments for each phase to avoid nonlinear phenomena, improve the accuracy of the electric power steering controller, and thus improve the feel of the power steering.

[0033] In summary, the present application discloses a current calibration tool for an electric power steering controller, which can accurately calibrate the resistors and operational amplifiers of the electric power steering controller to improve their consistency, solving the problem of poor consistency between mass-produced controllers in the prior art. It can also perform multiple calibrations in different current segments to achieve segmented current calibration, avoid nonlinear phenomena, and improve the performance and production efficiency of the controller.

[0034] Those skilled in the art will understand that the drawings are merely schematic diagrams of one embodiment, and that the components shown in the drawings are not necessarily essential to the practice of the present invention. It should also be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it need not be further defined or explained in subsequent drawings.

[0035] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances. In addition, in the description of the embodiments of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model.

[0036] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed by the present invention, or replace some of the technical features therein with equivalents. Such modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection described in the claims.

Claims

1. A current calibration tool for an electric power steering controller, characterized in that: include: Main control MCU, temperature sampling module, phase current monitoring module, communication module and power supply module; The phase line current monitoring module is electrically connected to the phase line between the motor and the electric power steering controller. The temperature sampling module is used to detect the operating temperature of the phase line current monitoring module. The main control MCU is electrically connected to the phase line current monitoring module and the temperature sampling module respectively, and the main control MCU is electrically connected to the electric power steering controller and the host computer respectively through the communication module. The power supply module is electrically connected to the main control MCU, the temperature sampling module, the phase line current monitoring module and the communication module respectively.

2. The current calibration tool for the electric power steering controller according to claim 1, characterized in that: Also includes: Connector module, the phase line current monitoring module is electrically connected to the phase line between the motor and the electric power steering controller through two connector modules.

3. The current calibration tool for the electric power steering controller according to claim 1, characterized in that: Also includes: The display and control module is electrically connected to the main control MCU through the communication module, and the power supply module is electrically connected to the display and control module.

4. The current calibration tool for the electric power steering controller according to claim 3, characterized in that: The communication module and the display and control module communicate with each other using SPI.

5. The current calibration tool for the electric power steering controller according to claim 1, characterized in that: The power supply module adopts a battery.

6. The current calibration tool for the electric power steering controller according to claim 1, characterized in that: The power supply module includes an AD / DC converter and a DC / DC converter.

7. The current calibration tool for the electric power steering controller according to claim 3, characterized in that: The display and control module adopts a touch liquid crystal display screen.

8. The current calibration tool for an electric power steering controller according to claim 1, characterized in that: The communication module is connected to the host computer via a CAN bus, an RS232 bus and / or an RS485 bus.

9. The current calibration tool for an electric power steering controller according to claim 1, characterized in that: The communication module and the main control MCU use SPI communication.

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