Device and method for testing rotating speed response time of driving motor of electric vehicle

Abstract

The invention provides an electric vehicle driving motor rotating speed response time test device and method, and belongs to the technical field of electric automobiles, the electric vehicle driving motor rotating speed response time test device comprises a driving motor, a rotating speed sensor and an upper computer, the rotating speed sensor is connected to the tail end of the driving motor through a flange, and the driving motor is connected with a motor controller for controlling the driving motor to move. And the upper computer is in communication connection with the motor controller. According to the invention, the rotating speed response time test can be carried out on the driving motor of the electric vehicle, different starting and ending points of the response time are determined, and a reference can be provided for the rotating speed response time test of the driving motor of each vehicle manufacturer.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric vehicles, and in particular relates to a device and method for testing the speed response time of a driving motor of an electric vehicle. Background Art

[0002] Speed ​​response time generally refers to the time it takes for a motor or control system to reach the target speed after receiving a command. Speed ​​response time is an important parameter for measuring the dynamic characteristics of electric vehicles. It directly affects the vehicle's power performance, driving performance, and vehicle response in emergency situations.

[0003] Since the current national standard does not provide a detailed description of the speed response time test method, and different manufacturers define the start and end points of "response time" differently, the test results are not comparable. Summary of the Invention

[0004] In response to the defects or shortcomings in the existing technology, the present invention provides an electric vehicle drive motor speed response time test device and method, which can perform speed response time tests on electric vehicle drive motors and clarify the different starting and ending points of the "response time", which can provide a reference for the drive motor speed response time tests of various automobile manufacturers.

[0005] To achieve the above object, the present invention adopts the following technical solutions: In the first aspect, an embodiment of the present invention provides an electric vehicle drive motor speed response time test device, including a drive motor, a speed sensor and a host computer, wherein the speed sensor is connected to the end of the drive motor through a flange, the drive motor is connected to a motor controller that controls the movement of the drive motor, and the host computer is communicatively connected to the motor controller.

[0006] Furthermore, it also includes a DC power supply module, which is electrically connected to the motor controller and is used to provide high-voltage power supply to the motor controller.

[0007] Furthermore, it also includes a mobile power supply cart, which includes a CAN module for receiving host computer instructions and sending them to the motor controller.

[0008] Furthermore, the mobile power supply cart also includes a battery module for providing low-voltage power supply for the vehicle wiring harness.

[0009] In a second aspect, an embodiment of the present invention provides a method for testing the speed response time of an electric vehicle drive motor, using the electric vehicle drive motor speed response time testing device described above, comprising the following steps: Step 1: Test component installation; Connect the speed sensor to the end of the drive motor through a flange, and connect the motor driver that controls the drive motor to the host computer; Step 2: Write the DBC file and configure the CAN channel; Write a DBC file according to the motor controller communication protocol, and import the DBC file into the host computer to configure the CAN channel; Step 3: Set the original test data and save it; Set the test condition data and original test data acquisition signal according to the test requirements, and record the test condition data and original data acquisition signal into the host computer for storage; Step 4: Send the required speed signal value; Obtaining actual speed data: The host computer sends the required speed signal value to the motor controller. The motor controller drives the motor to output the speed, and the speed sensor obtains the actual speed data of the drive motor. Step 5: Calculate the drive motor speed response time and end the test; The acquired original test data and actual speed data are processed to calculate the speed response time of the drive motor.

[0010] Furthermore, the test condition data includes low voltage supply voltage, DC bus voltage, required speed Test value, original test data collection time interval, original test data storage time; The original test data acquisition signal includes time, required speed Signal value, speed sensor sampling value N.

[0011] Furthermore, in step 5, the obtained original test data and actual speed data are processed, including the following steps: Record the time when the required speed signal value in the original test data is first sent ; After the host computer sends the required speed signal, the signal value reaches the motor controller immediately. The motor controller reacts after a period of delay. , start to control the output speed of the drive motor; The actual speed rises after a period of time , reaching the first speed peak; After the actual speed reaches the first speed peak, it enters the dynamic speed fluctuation range ; After the actual speed gradually stabilizes, it enters the static speed fluctuation range ; Calculate the static speed: Static speed is the average value of actual speed within the static speed fluctuation range ; ; Where n is the number of data points in the static speed fluctuation range; is the actual speed of the current data point within the static speed fluctuation range; The end time is the moment when the actual speed rises to the static speed for the first time within the static speed fluctuation range. ; Calculate the drive motor speed response time: .

[0012] Furthermore, the dynamic speed fluctuation range is the range where the absolute value of the speed difference between any adjacent peaks and troughs on the actual speed curve is greater than the speed tolerance. The static speed fluctuation range is the absolute value of the speed difference between any adjacent peaks and troughs on the actual speed curve is not greater than the speed tolerance The fluctuation range, the speed tolerance

[0013] ; in,

[0014] Furthermore, the peak or trough moment of the dynamic speed fluctuation interval and the static speed fluctuation interval is the critical moment .

[0015] Furthermore, ignoring the time consumption of the signal in the process of wiring harness transmission, that is, the moment when the host computer sends the required speed signal value is the moment when the motor controller first receives the required speed signal; The time from the start of saving the original data to sending the required speed test value is the idle time .

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention sets a speed sensor at the end of the drive motor, which is electrically connected to the host computer. The host computer directly obtains the speed of the drive motor, which can perform a drive motor speed response time test on the electric vehicle and ensure the accuracy of the test results.

[0017] 2. The present invention uses the time when the required speed signal value in the original test data is first sent as the initial time, and the time when the actual speed first rises to the static speed within the static speed fluctuation range as the end time. This clarifies that the starting and ending points of the "response time" are different, and can provide a reference for the drive motor speed response time tests of various automobile manufacturers. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the test device in Example 1 of the present invention; Figure 2 This is a flow chart of the test method in Example 2 of the present invention; Figure 3 is the actual speed fluctuation curve in the second embodiment of the present invention; Among them, 1. DC power supply module; 2. Motor controller; 3. Drive motor; 4. Speed ​​sensor; 5. Mobile power cart; 6. Host computer. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Example 1 A typical embodiment of the present invention is as follows Figure 1 As shown, a test device for the speed response time of an electric vehicle drive motor includes a drive motor 3 and a speed sensor 4. The speed sensor 4 is connected to the end of the drive motor 3 through a flange and is used to collect the real-time speed of the end of the drive motor 3. The drive motor 3 is connected to the motor controller 2 for controlling the action of the drive motor 3. The motor controller 2 is connected to the DC power supply module 1, and the DC power supply module 1 is used to provide high-voltage power supply for the motor controller 2.

[0021] It also includes a host computer 6 and a mobile power cart 5. The host computer 6 is used to send command signals and receive information from the speed sensor 4 and the motor controller 2. The mobile power cart 5 includes a CAN module for receiving instructions from the host computer 6 and sending them to the motor controller 2. The mobile power cart 5 includes a battery module to provide low-voltage power supply for the entire vehicle wiring harness.

[0022] During use, the speed sensor 4 is connected to the end of the drive motor 3 via a flange. The host computer 6 communicates with the motor controller 2 via the CAN network. Communication between the host computer 6 and the motor controller 2 requires the compilation of a DBC file based on the vehicle's CAN communication protocol. This file contains control signals such as the motor's required speed, required motor speed, motor controller enable, motor control mode, cycle counter, fault code, and rotation direction. The DBC file is imported into the host computer 6 software, and the signal channels are configured to form a communication network. The host computer 6 sends a speed command, which is then transmitted to the motor controller 2 via the CAN module in the mobile power cart 5. This command is used to control the output speed of the drive motor 3 for testing.

[0023] Example 2 This embodiment provides a method for testing the speed response time of an electric vehicle drive motor, using the electric vehicle drive motor speed response time testing device as described in the first embodiment. Figure 2 As shown, the following steps are included: Step 1: Test component installation; The speed sensor is connected to the end of the drive motor through a flange, and the motor driver that controls the drive motor is connected to the host computer. The host computer is used to send command signals and receive information from the speed sensor and motor controller.

[0024] The motor driver is also connected to a DC power module and a mobile power cart. The DC power module provides high-voltage power supply for the motor controller, and the mobile power cart contains a battery module, which provides low-voltage power supply for the vehicle wiring harness.

[0025] Furthermore, the mobile power supply vehicle also includes a CAN module for receiving host computer instructions and sending them to the motor controller.

[0026] Step 2: Write the DBC file and configure the CAN channel; Write a DBC file according to the motor controller communication protocol, import the DBC file into the host computer software, configure the signal channel to form a communication network, and the host computer sends instructions through the CAN channel to the motor controller to control the operation of the drive motor.

[0027] The DBC file contains control signals such as motor required speed, motor required speed, motor controller enable, motor control mode, cycle counter, fault code, and rotation direction.

[0028] Step 3: Set the original test data and save it: Set the test condition data and original test data acquisition signal according to the test requirements, and record the test condition data and original data acquisition signal into the host computer for storage; The test condition data includes low voltage supply voltage, DC bus voltage, required speed Test value, original test data collection time interval, original test data storage time; The original test data acquisition signal includes time, required speed Signal value, speed sensor sampling value N; Step 4: Send the required speed signal value and obtain the actual speed data: The host computer sends a required speed signal value, the motor controller receives and processes the required speed signal value and sends instructions to control the operation of the drive motor, and the drive motor outputs the speed.

[0029] The actual speed data is obtained through the speed sensor at the end of the drive motor and transmitted to the host computer to obtain the actual speed fluctuation curve; Step 5: Calculate the drive motor speed response time and end the test; The acquired original test data and actual speed data are processed to calculate the speed response time of the drive motor.

[0030] Specifically, the original test data of the speed response time test process is obtained; Ignore the time consumption of the signal during the wiring harness transmission process, that is, the moment when the host computer sends the required speed signal value is the moment when the motor controller first receives the required speed signal; The time from the start of saving the original data to sending the required speed test value is the idle time ; Record the time when the required speed signal value in the original test data is first sent ; Get target speed ; = ; in, is the required speed.

[0031] like Figure 3 As shown in the figure, after the host computer sends the required speed signal, the signal value reaches the motor controller immediately, and the motor controller reacts after a period of delay. , start to control the output speed of the drive motor; The actual speed rises after a period of time , reaching the first speed peak; After the actual speed reaches the first speed peak, it enters the dynamic speed fluctuation range ; After the actual speed gradually stabilizes, it enters the static speed fluctuation range ; The dynamic speed fluctuation range is when the absolute value of the speed difference between any adjacent peaks and valleys on the actual speed curve is greater than the speed tolerance. The fluctuation range of The static speed fluctuation range is the absolute value of the speed difference between any adjacent peaks and troughs on the actual speed curve is not greater than the speed tolerance fluctuation range.

[0032] The peak or trough moment of the dynamic speed fluctuation range and the static speed fluctuation range is the critical moment ; The speed tolerance is ; Calculate the static speed: Static speed is the average value of actual speed within the static speed fluctuation range ; ; Where n is the number of data points in the static speed fluctuation range; is the actual speed of the current data point within the static speed fluctuation range; The end time is the moment when the actual speed rises to the static speed for the first time within the static speed fluctuation range. ; Calculate the drive motor speed response time:

[0033] The following is an example of a speed response time test for an electric vehicle drive motor; Get the raw data of speed response time, see the table below.

[0034]

[0035] Look up the table to get the time when the required speed signal value is first sent 2.64s; The actual speed is collected by the speed sensor , see the table above; Get the target speed = =13000rpm: Calculate the speed tolerance: ; Calculate the absolute value of the speed difference between adjacent peaks and troughs, refer to the table above; Get the critical moment 4.09s; Therefore, the dynamic speed fluctuation range is 3.07s~4.09s; the static speed fluctuation range is 4.09s~4.47s; Calculate static speed : ; The table shows that the end time is 4.09s; Calculate the drive motor speed response time: .

[0036] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An electric vehicle drive motor speed response time test device, characterized in that: It includes a driving motor, a speed sensor and a host computer. The speed sensor is connected to the end of the driving motor through a flange. The driving motor is connected to a motor controller that controls the movement of the driving motor. The host computer is in communication with the motor controller.

2. The electric vehicle drive motor speed response time test device according to claim 1, characterized in that: It also includes a DC power supply module, which is electrically connected to the motor controller and is used to provide high-voltage power supply to the motor controller.

3. The electric vehicle drive motor speed response time test device according to claim 1, characterized in that: It also includes a mobile power supply cart, which contains a CAN module for receiving commands from a host computer and sending them to a motor controller.

4. The electric vehicle drive motor speed response time test device according to claim 3, characterized in that: The mobile power cart also includes a battery module, which is used to provide low-voltage power supply for the vehicle wiring harness.

5. A method for testing the speed response time of an electric vehicle drive motor, using the electric vehicle drive motor speed response time testing device according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Test component installation; Connect the speed sensor to the end of the drive motor through a flange, and connect the motor driver that controls the drive motor to the host computer; Step 2: Write the DBC file and configure the CAN channel; Write a DBC file according to the motor controller communication protocol, and import the DBC file into the host computer to configure the CAN channel; Step 3: Set the original test data and save it; Set the test condition data and original test data acquisition signal according to the test requirements, and record the test condition data and original data acquisition signal into the host computer for storage; Step 4: Send the required speed signal value; Obtaining actual speed data: The host computer sends the required speed signal value to the motor controller. The motor controller drives the motor to output the speed, and the speed sensor obtains the actual speed data of the drive motor. Step 5: Calculate the drive motor speed response time and end the test; The acquired original test data and actual speed data are processed to calculate the speed response time of the drive motor.

6. A method for testing the speed response time of an electric vehicle drive motor according to claim 5, characterized in that: Test condition data include low voltage supply voltage, DC bus voltage, required speed Test value, original test data collection time interval, original test data storage time; The original test data acquisition signal includes time, required speed Signal value, speed sensor sampling value N.

7. The electric vehicle drive motor speed response time test method according to claim 5, characterized in that: In step 5, the obtained original test data and actual speed data are processed, including the following steps: Record the time when the required speed signal value in the original test data is first sent ; After the host computer sends the required speed signal, the signal value reaches the motor controller immediately. The motor controller reacts after a period of delay. , start to control the output speed of the drive motor; The actual speed rises after a period of time , reaching the first speed peak; After the actual speed reaches the first speed peak, it enters the dynamic speed fluctuation range ; After the actual speed gradually stabilizes, it enters the static speed fluctuation range ; Calculate the static speed: Static speed is the average value of actual speed within the static speed fluctuation range ; ； Where n is the number of data points in the static speed fluctuation range; is the actual speed of the current data point within the static speed fluctuation range; The end time is the moment when the actual speed rises to the static speed for the first time within the static speed fluctuation range. ; Calculate the drive motor speed response time: 。 8. The electric vehicle drive motor speed response time test method according to claim 7, characterized in that: The dynamic speed fluctuation range is when the absolute value of the speed difference between any adjacent peaks and troughs on the actual speed curve is greater than the speed tolerance The static speed fluctuation range is the absolute value of the speed difference between any adjacent peaks and troughs on the actual speed curve is not greater than the speed tolerance The fluctuation range, the speed tolerance ； in, .

9. A method for testing the speed response time of an electric vehicle drive motor according to claim 8, characterized in that: The peak or trough moment of the dynamic speed fluctuation range and the static speed fluctuation range is the critical moment .

10. Ignore the time consumption of the signal during the wiring harness transmission process, that is, the moment when the host computer sends the required speed signal value is the moment when the motor controller first receives the required speed signal; The time from the start of saving the original data to sending the required speed test value is the idle time .

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