CN111207866A - EPS motor external characteristic automatic test system and method - Google Patents
EPS motor external characteristic automatic test system and method Download PDFInfo
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- CN111207866A CN111207866A CN201910849211.5A CN201910849211A CN111207866A CN 111207866 A CN111207866 A CN 111207866A CN 201910849211 A CN201910849211 A CN 201910849211A CN 111207866 A CN111207866 A CN 111207866A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
- G01L5/0042—Force sensors associated with force applying means applying a torque
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/22—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force applied to control members, e.g. control members of vehicles, triggers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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Abstract
The invention provides an automatic test system for external characteristics of an EPS motor, which comprises a rack, wherein an industrial personal computer, a data acquisition card, a servo controller, a servo motor, an ECU controller, a power-assisted motor, a torque sensor and a test circuit are fixed on the rack, and the torque test circuit, the servo motor control circuit and the power-assisted motor control circuit are all connected with a power supply loop. The motor characteristic curve generated by the invention is not required to be fitted, the generated motor characteristic curve is accurate, the whole testing process is automatic, manual participation is not required, and the testing efficiency is high.
Description
Technical Field
The invention relates to the field of motor testing, in particular to an EPS motor external characteristic automatic testing system and method.
Background
In the development stage of the steering system, the external characteristics of the power-assisted motor need to be mastered, and whether the power-assisted characteristics provided by the power-assisted motor meet the application requirements or not is the input shaft under different rotating speeds and loads.
The existing test method is usually actual installation test, or the input shaft controls the rotating speed through a servo motor to simulate the actual situation. And setting the servo motor to a constant rotating speed in a segmentation mode in a rotating speed interval, recording the torque of the power-assisted motor at the corresponding rotating speed, and estimating the torque of the power-assisted motor at the rotating speed which is not measured in a fitting mode. However, the method has the disadvantages that the given rotating speed is limited in number of segments, so that the external characteristic curve is not accurate enough, the external influence is serious, and the testing efficiency is low.
Disclosure of Invention
The invention provides an automatic testing system for the external characteristics of an EPS motor, aiming at solving the problems that the measured external characteristic curve is not accurate enough, the external influence is serious and the testing efficiency is low in the existing testing method, so that the torque under the motor rotating speed covering the whole range is controlled at a more accurate speed, the external interference is deeply inhibited, real and accurate measuring data are obtained, and the data after fitting and processing are not used as the external characteristic data of the motor.
In order to achieve the above purpose, the present invention provides the following technical solutions:
an EPS motor external characteristic automatic test system comprises a rack, an industrial personal computer, a data acquisition card, a servo controller, a servo motor, an ECU controller, a power-assisted motor, a torque sensor and a test circuit are fixed on the rack,
the industrial personal computer is provided with an LABVIEW unit and a CANape unit, the LABVIEW unit sends a frequency conversion pulse instruction, and the CANape unit outputs a CAN control signal;
the data acquisition card is used for acquiring a variable frequency pulse instruction sent by the LABVIEW unit, producing a voltage signal and sending the voltage signal to the servo controller, and the data acquisition card is used for acquiring a torque signal produced by the torque sensor, producing a torque value and transmitting the torque value to the industrial personal computer;
the servo controller receives the voltage signal and controls the rotating speed of the servo motor;
the ECU controller receives the CAN control signal output by the CANape unit, generates power-assisted current and controls the power-assisted motor to rotate;
one end of the torque sensor is connected with the servo motor through a coupler, and the other end of the torque sensor is connected with the power-assisted motor through a coupler;
the test circuit comprises a power supply loop, a torque test circuit, a servo motor control circuit and a power assisting motor control circuit, wherein the torque test circuit, the servo motor control circuit and the power assisting motor control circuit are all connected to the power supply loop.
The invention connects an industrial personal computer, a data acquisition card, a servo controller, a servo motor, an ECU controller, a booster motor and a torque sensor for testing through a test circuit, wherein a certain number of pulses are required to be received by the motor during each rotation, the pulse output frequency is changed in a mode of outputting pulse instructions through an LABVIEW unit of the industrial personal computer, then the pulse output frequency is converted into a voltage signal by the data acquisition card and is transmitted to the servo controller, the servo controller adjusts the rotating speed of the servo motor according to the changed voltage signal, a CAN control signal is output by a CANape unit to enable the ECU controller to output a booster motor control current to control the rotation of the booster motor, the actual rotating speed of the motor is calculated according to the pulse frequency, the servo motor is locked and connected with a rotating speed torque sensor, constant torque is input at the other end, input is carried forward and input torque and output torque are recorded, the data points which are input progressively and measured are continuous, the data points are adjacent to form a motor characteristic curve, fitting is not needed, the generated motor characteristic curve is accurate, and the testing efficiency is high.
Preferably, the bottom of the rack is provided with a balancing weight, so that vibration in the testing process is reduced, and the stability under high rotating speed is improved, thereby reducing external influence in the testing process and enabling the testing result to be more accurate.
Preferably, the power supply loop comprises a main power supply input end, a torque sensor power supply end, a servo motor power supply end and a power assisting motor power supply end,
the input end of the main power supply is connected to a transformer through a first switch, and the output end of the transformer is used as the power supply end of the torque sensor;
the input end of the main power supply is connected to the input end of the filter transformer through a second switch, the output end of the filter transformer is connected to the input end of the servo electronic transformer, the output end of the servo electronic transformer is connected to the power supply voltage input end of the servo controller, and the control voltage output end of the servo controller serves as the power supply end of the servo motor;
the input end of the general power supply is connected with the input end of the programmable power supply through a third switch, the input end of the programmable power supply is connected with the power supply input end of the ECU controller, and the current output end of the ECU controller is used as the power supply end of the power-assisted motor.
Preferably, the torque testing circuit comprises a torque sensor, an optical coupling isolation module, an industrial personal computer and a data acquisition card, wherein the torque sensor is provided with a torque signal output end and a rotating speed signal output end, the optical coupling isolation module is provided with a first optical coupler and a second optical coupler, and the data acquisition card is an NI board card;
the utility model discloses a torque sensor, including NI integrated circuit board, torque sensor, first opto-coupler, NI integrated circuit board, torque sensor power supply input end, torque signal output end, first opto-coupler, second opto-coupler, NI integrated circuit board, torque sensor power supply input end connects in the torque sensor power supply end, torque signal output end connects in the positive pole of the first diode of first opto-coupler, and the negative pole of first diode is connected in the negative pole of the second diode of second opto-coupler, and the positive pole of second diode is connected in rotational speed signal output end, the first emitter of first opto-coupler connects in the earthing terminal of NI integrated circuit board, the second emitter of second opto-coupler connects in the earthing terminal of NI integrated circuit board, the torque signal receiving terminal of NI.
Preferably, the servo motor control circuit comprises a servo controller, an NI board card, an industrial personal computer, a servo motor and an optical coupling isolation differential pulse conversion module,
the transmission frequency conversion pulse instruction of the LABVIEW unit of industrial computer is to the frequency conversion pulse instruction receiving terminal of NI integrated circuit board, NI integrated circuit board control voltage signal output part is connected in servo controller control voltage signal receiving terminal, servo controller's control voltage output part is connected with servo motor as the servo motor power supply end, servo controller connects the transmitting end that the optical coupling keeps apart difference commentaries on classics pulse module, the receiving terminal that the optical coupling keeps apart difference commentaries on classics pulse module is connected in the NI integrated circuit board.
Preferably, the power-assisted motor control circuit comprises an industrial personal computer, an ECU controller and a power-assisted motor, the current output end of the ECU controller is connected with the power-assisted motor as the power supply end of the power-assisted motor, and the CAN control signal output end of the CANape unit of the industrial personal computer is connected with the CAN control signal receiving end of the ECU controller.
An automatic test method for the external characteristics of an EPS motor, which adopts the automatic test system for the external characteristics of the EPS motor of claim 6, and is characterized by comprising the following steps:
s1, confirming that the main power supply loop, the control loop, the signal transmission loop and the power-assisted motor are connected with the controller loop without errors and have no error report condition after being electrified;
s2, the LABVIEW unit of the industrial personal computer sends out a frequency conversion pulse instruction, and the CANape unit of the industrial personal computer outputs a CAN control signal;
s3, the data acquisition card receives the frequency conversion pulse instruction and outputs the control voltage of the servo motor, the servo controller receives the control voltage of the servo motor and controls the servo motor to rotate, the servo motor drives the power-assisted motor to rotate through the torque sensor, and the ECU controller receives the CAN control signal and outputs the power-assisted current to enable the power-assisted motor and the servo motor to rotate in the same direction;
s4, configuring the lowest rotating speed and the highest rotating speed according to the test specification, controlling the ECU controller to load the maximum power-assisted current to enable the rotating directions to be opposite and the same, and reading the torque value and the rotating speed of the power-assisted motor;
s5, controlling the rotating speed of the servo motor to accelerate from 0 to the highest rotating speed by the industrial personal computer, and recording the servo motor torque under different rotating speeds in real time;
and S6, the industrial personal computer saves the test data and automatically generates a motor characteristic curve.
The invention connects an industrial personal computer, a data acquisition card, a servo controller, a servo motor, an ECU controller, a booster motor and a torque sensor for testing through a test circuit, wherein a certain number of pulses are required to be received by the motor during each rotation, the pulse output frequency is changed in a mode of outputting pulse instructions through an LABVIEW unit of the industrial personal computer, then the pulse output frequency is converted into a voltage signal by the data acquisition card and is transmitted to the servo controller, the servo controller adjusts the rotating speed of the servo motor according to the changed voltage signal, a CAN control signal is output by a CANape unit to enable the ECU controller to output a booster motor control current to control the rotation of the booster motor, the actual rotating speed of the motor is calculated according to the pulse frequency, the servo motor is locked and connected with a rotating speed torque sensor, constant torque is input at the other end, input is carried forward and input torque and output torque are recorded, the data points which are input and measured in a progressive mode are continuous, the data points are adjacent to form a motor characteristic curve, fitting is not needed, the generated motor characteristic curve is accurate, the whole testing process is automatic, manual participation is not needed, and the testing efficiency is high.
Preferably, the industrial control computer controls the rotating speed of the servo motor to accelerate from 0 to the highest rotating speed, and the process of recording the servo motor torque under different rotating speeds in real time comprises the following steps,
s501, receiving a servo motor control voltage, controlling the output torque of a motor to change from 0N to 10N at a constant speed within T time by a servo controller, generating N torque instructions, setting the speed of acquiring the torque value of a torque sensor, and acquiring N torque values within T time;
s502, collecting n torque instructions to generate a first torque table, and collecting n torque values to generate a second torque table;
and S503, integrating the first torque table and the second torque table to generate a torque input value and torque sampling value corresponding table.
And testing to obtain a sampling value, and obtaining a corresponding torque input value according to the torque input value and the torque sampling value corresponding table.
Therefore, the invention has the following beneficial effects: (1) the method is characterized in that the pulse output frequency is changed in real time to control the real-time change of the rotating speed of the servo motor in a mode that an LABVIEW unit of an industrial personal computer outputs a pulse instruction, a torque sensor measures the torque change in real time and transmits the torque change to the industrial personal computer, the industrial personal computer automatically generates a motor characteristic curve, the whole process is automatically tested, the measured data points are continuous, the data points are connected to form the motor characteristic curve, fitting is not needed, the generated motor characteristic curve is accurate, manual participation is not needed, and the testing efficiency is high; (2) the balancing weight is added to the rack, vibration in the test process is reduced, stability under the high rotating speed is improved, external influence in the test process is reduced, and the test result is more accurate.
Drawings
FIG. 1 is a system block diagram of the present invention
FIG. 2 is a circuit diagram of the present invention
FIG. 3 is a power supply circuit diagram of the present invention
FIG. 4 is a circuit diagram of a torque test according to the present invention
FIG. 5 is a circuit diagram of a servo motor control circuit according to the present invention
FIG. 6 is a circuit diagram of an assist motor control circuit of the present invention
FIG. 7 is a torque profile obtained from testing of the present invention
Wherein: 1. the device comprises an industrial personal computer 2, an LABVIEW unit 3, a data acquisition card 4, a servo controller 5, a servo motor 6, a torque sensor 7, a power-assisted motor 8, an ECU controller 9, a CANape unit 10, a power supply loop 11, a power-assisted motor control circuit 12, a servo motor control circuit 13, a torque test circuit 14, a filter transformer 15 and an optical coupling isolation differential rotary pulse module.
Detailed Description
Example (b):
the embodiment provides an automatic testing system for external characteristics of an EPS motor, which comprises a rack, wherein an industrial personal computer 1, a data acquisition card 3, a servo controller 4, a servo motor 5, an ECU controller 8, a power-assisted motor 7, a torque sensor 6 and a testing circuit are fixed on the rack in combination with a figure 1,
the industrial personal computer 1 is provided with an LABVIEW unit 2 and a CANape unit 9, wherein the LABVIEW unit 2 sends a frequency conversion pulse instruction, and the CANape unit 9 outputs a CAN control signal;
the data acquisition card 3 is used for acquiring a frequency conversion pulse instruction sent by the LABVIEW unit 2, producing a voltage signal and sending the voltage signal to the servo controller 4, and the data acquisition card 3 is used for acquiring a torque signal produced by the torque sensor 6, producing a torque value and transmitting the torque value to the industrial personal computer 1;
the servo controller 4 receives the voltage signal and controls the rotating speed of the servo motor 5;
the ECU controller 8 receives the CAN control signal output by the CANape unit, generates boosting current and controls the boosting motor 7 to rotate;
one end of the torque sensor 6 is connected with the servo motor 5 through a coupler, and the other end of the torque sensor 6 is connected with the power-assisted motor 7 through a coupler;
the test circuit, with reference to fig. 2, includes a power supply circuit 10, a torque test circuit 13, a servo motor control circuit 12, and a power assist motor control circuit 11, where the torque test circuit 13, the servo motor control circuit 12, and the power assist motor control circuit 11 are all connected to the power supply circuit 10.
The invention connects an industrial personal computer 1, a data acquisition card 3, a servo controller 4, a servo motor 5, an ECU controller 8, a power-assisted motor 7 and a torque sensor 6 through a test circuit for testing, a certain number of pulses are required to be received by the motor per circle, the pulse output frequency is changed in a mode of outputting pulse instructions through an LABVIEW unit of the industrial personal computer 1, then the pulse output frequency is converted into voltage signals by the data acquisition card 3 and is transmitted to the servo controller 4, the servo controller 4 adjusts the rotating speed of the servo motor 5 according to the changed voltage signals, a CANape unit outputs CAN control signals to enable the ECU controller 8 to output control current of the power-assisted motor 7 and control the power-assisted motor 7 to rotate, meanwhile, the actual rotating speed of the motor is calculated according to the pulse frequency, the servo motor 5 is locked and connected with the rotating speed torque sensor 6, constant torque is input at the other end, input is carried out in, the motor characteristic curve is generated, the data points which are input progressively and measured are continuous, the data points are adjacent to form the motor characteristic curve, fitting is not needed, the generated motor characteristic curve is accurate, and the testing efficiency is high.
As the preferred, the rack bottom is equipped with the balancing weight, reduces the vibration in the testing process to this stability under promoting high rotational speed, thereby reduce the external influence in the testing process, make the test result more accurate.
Referring to fig. 3, the power supply circuit 10 includes a main power input terminal, a torque sensor 6 power supply terminal, a servo motor 5 power supply terminal, and a power assisting motor 7 power supply terminal,
the input end of the main power supply is connected to a transformer through a first switch, and the output end of the transformer is used as the power supply end of the torque sensor 6;
the input end of the main power supply is connected to the input end of the filter transformer 14 through a second switch, the output end of the filter transformer 14 is connected to the input end of the servo electronic transformer, the output end of the servo electronic transformer is connected to the power supply voltage input end of the servo controller 4, and the control voltage output end of the servo controller 4 is used as the power supply end of the servo motor 5;
the input end of the main power supply is connected with the input end of the programmable power supply through a third switch, the input end of the programmable power supply is connected with the power supply input end of the ECU controller 8, and the current output end of the ECU controller 8 is used as the power supply end of the power-assisted motor 7.
Referring to fig. 4, the torque testing circuit 13 includes a torque sensor 6, an optical coupling isolation module, an industrial personal computer 1 and a data acquisition card 3, the torque sensor 6 is provided with a torque signal output end and a rotation speed signal output end, the optical coupling isolation module is provided with a first optical coupler and a second optical coupler, and the data acquisition card 3 is an NI board card;
the 6 power supply input ends of torque sensor connect in the 6 power supply ends of torque sensor, torque signal output end connects in the positive pole of the first diode of first opto-coupler, the negative pole of first diode is connected in the negative pole of the second diode of second opto-coupler, the positive pole of second diode is connected in rotational speed signal output end, the first emitter of first opto-coupler connects in the earthing terminal of NI integrated circuit board, the second emitter of second opto-coupler connects in the earthing terminal of NI integrated circuit board, the torque signal receiving terminal of NI integrated circuit board is carried with torque signal to the first collecting electrode of first opto-coupler, rotational speed signal carries the rotational speed signal receiving terminal of NI integrated circuit board with rotational speed signal to the second collecting electrode of second opto-coupler, the integrated circuit board generates torque value.
Referring to fig. 5, the servo motor control circuit 12 includes a servo controller 4, an NI board, an industrial personal computer 1, a servo motor 5, and an optical coupling isolation differential transfer pulse module 15,
the frequency conversion pulse instruction of the LABVIEW unit of industrial computer 1 is transmitted to the frequency conversion pulse instruction receiving terminal of NI integrated circuit board, NI integrated circuit board control voltage signal output end is connected in servo controller 4 control voltage signal receiving terminal, servo controller 4's control voltage output end is connected with servo motor 5 as servo motor 5 power supply end, servo controller 4 connects the transmitting terminal that the optical coupling keeps apart difference and changes pulse module 15, the receiving terminal that the optical coupling keeps apart difference changes pulse module 15 is connected in the NI integrated circuit board.
With reference to fig. 6, the servo motor control circuit 11 comprises an industrial personal computer 1, an ECU controller 8 and a servo motor 7, a current output end of the ECU controller 8 is connected with the servo motor 7 as a power supply end of the servo motor 7, and a CAN control signal output end of a CAN unit of the industrial personal computer 1 is connected with a CAN control signal receiving end of the ECU controller 8.
An automatic test method for the external characteristics of an EPS motor, which adopts the automatic test system for the external characteristics of the EPS motor of claim 6, and is characterized by comprising the following steps:
s1, confirming that the main power supply loop, the control loop, the signal transmission loop and the power-assisted motor 7 are connected with the controller loop without errors and have no error report condition after being electrified;
s2, the LABVIEW unit of the industrial personal computer 1 sends out a frequency conversion pulse instruction, and the CANape unit of the industrial personal computer 1 outputs a CAN control signal;
s3, the data acquisition card 3 receives the frequency conversion pulse instruction and outputs the control voltage of the servo motor 5, the servo controller 4 receives the control voltage of the servo motor 5 and controls the servo motor 5 to rotate, the servo motor 5 drives the power-assisted motor 7 to rotate through the torque sensor 6, the ECU controller 8 receives the CAN control signal and outputs the power-assisted current, and the power-assisted motor 7 and the servo motor 5 rotate in the same direction;
s4, configuring the lowest rotating speed and the highest rotating speed according to the test specification, controlling the ECU controller 8 to load the maximum power-assisted current by the industrial personal computer 1 to enable the rotating directions to be relatively the same, and reading the torque value and the rotating speed of the power-assisted motor 7;
s5, the industrial personal computer 1 controls the rotating speed of the servo motor 5 to accelerate from 0 to the highest rotating speed, and records the servo motor torque under different rotating speeds in real time;
s501, receiving a servo motor 5 to control a voltage servo controller 4 to control the output torque of a motor to change from 0N to 10N at a constant speed within T time, generating N torque instructions, setting the speed of acquiring the torque value of a torque sensor 6, and acquiring N torque values within T time;
s502, collecting n torque instructions to generate a first torque table, and collecting n torque values to generate a second torque table;
and S503, integrating the first torque table and the second torque table to generate a torque input value and torque sampling value corresponding table.
And testing to obtain a sampling value, and obtaining a corresponding torque input value according to the torque input value and the torque sampling value corresponding table.
And S6, storing the test data and automatically generating a motor characteristic curve by the industrial personal computer 1, establishing a rectangular coordinate system by taking the input torque as an x axis and the measured torque as a y axis in combination with the graph shown in FIG. 7, marking the torque value points measured in real time into the coordinate system, connecting adjacent torque value points to obtain the motor characteristic curve, and knowing that the torque at the moment is 5N through the torque input value and torque sampling value corresponding table when the acquired torque is 4.5N.
The invention connects an industrial personal computer 1, a data acquisition card 3, a servo controller 4, a servo motor 5, an ECU controller 8, a power-assisted motor 7 and a torque sensor 6 through a test circuit for testing, a certain number of pulses are required to be received by the motor per circle, the pulse output frequency is changed in a mode of outputting pulse instructions through an LABVIEW unit of the industrial personal computer 1, then the pulse output frequency is converted into voltage signals by the data acquisition card 3 and is transmitted to the servo controller 4, the servo controller 4 adjusts the rotating speed of the servo motor 5 according to the changed voltage signals, a CANape unit outputs CAN control signals to enable the ECU controller 8 to output control current of the power-assisted motor 7 and control the power-assisted motor 7 to rotate, meanwhile, the actual rotating speed of the motor is calculated according to the pulse frequency, the servo motor 5 is locked and connected with the rotating speed torque sensor 6, constant torque is input at the other end, input is carried out in, the motor characteristic curve is generated, the data points which are input progressively and measured are continuous, the data points are adjacent to form the motor characteristic curve, fitting is not needed, the generated motor characteristic curve is accurate, the whole testing process is automatic, manual participation is not needed, and the testing efficiency is high.
Therefore, the invention has the following advantages:
(1) the method comprises the steps that the pulse output frequency is changed in real time to control the real-time change of the rotating speed of the servo motor 5 in a mode that an LABVIEW unit of the industrial personal computer 1 outputs a pulse instruction, the torque sensor 6 measures the torque change in real time and transmits the torque change to the industrial personal computer 1, the industrial personal computer 1 automatically generates a motor characteristic curve, the whole process is automatically tested, the measured data points are continuous, the data points are connected to form the motor characteristic curve, fitting is not needed, the generated motor characteristic curve is accurate, manual participation is not needed, and the testing efficiency is high;
(2) the balancing weight is added to the rack, vibration in the test process is reduced, stability under the high rotating speed is improved, external influence in the test process is reduced, and the test result is more accurate.
Claims (8)
1. An EPS motor external characteristic automatic test system comprises a rack, and is characterized in that an industrial personal computer (1), a data acquisition card (3), a servo controller (4), a servo motor (5), an ECU controller (8), a power-assisted motor (7), a torque sensor (6) and a test circuit are fixed on the rack,
the industrial personal computer (1) is provided with an LABVIEW unit (2) and a CANape unit (9), the LABVIEW unit (2) sends a frequency conversion pulse instruction, and the CANape unit (9) outputs a CAN control signal;
the data acquisition card (3) is used for acquiring a frequency conversion pulse instruction sent by the LABVIEW unit (2), producing a voltage signal and sending the voltage signal to the servo controller (4), and the data acquisition card (3) is used for acquiring a torque signal produced by the torque sensor (6), generating a torque value and transmitting the torque value to the industrial personal computer (1);
the servo controller (4) receives the voltage signal and controls the rotating speed of the servo motor (5);
the ECU controller (8) receives CAN control signals output by the CANape unit (9), generates boosting current and controls the boosting motor (7) to rotate;
one end of the torque sensor (6) is connected with the servo motor (5) through a coupler, and the other end of the torque sensor (6) is connected with the power-assisted motor (7) through the coupler;
the test circuit comprises a power supply loop (10), a torque test circuit (13), a servo motor control circuit (12) and a power assisting motor control circuit (11), wherein the torque test circuit (13), the servo motor control circuit (12) and the power assisting motor control circuit (11) are all connected to the power supply loop (10).
2. The automatic test system for the external characteristics of the EPS motor as claimed in claim 1, wherein a balancing weight is arranged at the bottom of the rack.
3. The automatic test system for the external characteristics of the EPS motor according to claim 1, wherein the power supply loop (10) comprises a main power input end, a power supply end of the torque sensor (6), a power supply end of the servo motor (5) and a power supply end of the power-assisted motor (7),
the input end of the main power supply is connected to a transformer through a first switch, and the output end of the transformer is used as the power supply end of the torque sensor (6);
the input end of the main power supply is connected to the input end of a filter transformer (14) through a second switch, the output end of the filter transformer (14) is connected to the input end of a servo electronic transformer, the output end of the servo electronic transformer is connected to the power supply voltage input end of a servo controller (4), and the control voltage output end of the servo controller (4) is used as the power supply end of a servo motor (5);
the input end of the main power supply is connected with the input end of the programmable power supply through a third switch, the input end of the programmable power supply is connected with the power supply input end of the ECU controller (8), and the current output end of the ECU controller (8) is used as the power supply end of the power-assisted motor (7).
4. The automatic test system for the external characteristics of the EPS motor according to claim 3, wherein the torque test circuit (13) comprises a torque sensor (6), an optical coupling isolation module, an industrial personal computer (1) and a data acquisition card (3), the torque sensor (6) is provided with a torque signal output end and a rotating speed signal output end, the optical coupling isolation module is provided with a first optical coupler and a second optical coupler, and the data acquisition card (3) is an NI board card;
torque sensor (6) power supply input end is connected in torque sensor (6) feed end, torque signal output end connects in the positive pole of the first diode of first opto-coupler, and the negative pole of first diode is connected in the negative pole of the second diode of second opto-coupler, and the positive pole of second diode is connected in rotational speed signal output end, the first emitter of first opto-coupler connects in the earthing terminal of NI integrated circuit board, the second emitter of second opto-coupler connects in the earthing terminal of NI integrated circuit board, the torque signal receiving terminal of NI integrated circuit board is carried with torque signal to the first collecting electrode of first opto-coupler, the rotational speed signal receiving terminal of NI integrated circuit board is carried with rotational speed signal to the second collecting electrode of second opto-coupler, and NI integrated circuit board generation torque value and rotational speed value transmit industrial computer (1.
5. The automatic test system for the external characteristics of the EPS motor according to claim 4, wherein the servo motor control circuit (12) comprises a servo controller (4), an NI board card, an industrial personal computer (1), a servo motor (5) and an optical coupling isolation differential rotary pulse module (15),
the variable frequency pulse instruction of transmission frequency conversion pulse instruction to the NI integrated circuit board of LABVIEW unit (2) of industrial computer (1) instructs the receiving terminal to, NI integrated circuit board control voltage signal output part is connected in servo controller (4) control voltage signal receiving terminal, the control voltage output part of servo controller (4) is connected with servo motor (5) power supply end as servo motor (5), servo controller (4) are connected the transmitting end that the optical coupling keeps apart difference commentaries on classics pulse module (15), the receiving terminal that the optical coupling keeps apart difference commentaries on classics pulse module (15) is connected in the NI integrated circuit board.
6. The automatic EPS motor external characteristic testing system of claim 5, wherein the power-assisted motor control circuit (11) comprises an industrial personal computer (1), an ECU controller (8) and a power-assisted motor (7), a current output end of the ECU controller (8) is connected with the power-assisted motor (7) as a power supply end of the power-assisted motor (7), and a CAN control signal output end of a CANape unit (9) of the industrial personal computer (1) is connected with a CAN control signal receiving end of the ECU controller (8).
7. An automatic test method for the external characteristics of an EPS motor, which adopts the automatic test system for the external characteristics of the EPS motor of claim 6, and is characterized by comprising the following steps:
s1, confirming that the main power circuit, the control circuit, the signal transmission circuit and the booster motor (7) are connected with the ECU controller (8) without errors and have no error reporting condition after being electrified;
s2, the LABVIEW unit (2) of the industrial personal computer (1) sends a frequency conversion pulse instruction, and the CANape unit (9) of the industrial personal computer (1) outputs a CAN control signal;
s3, a data acquisition card (3) receives a frequency conversion pulse instruction and outputs a control voltage of a servo motor (5), a servo controller (4) receives the control voltage of the servo motor (5) to control the servo motor (5) to rotate, the servo motor (5) drives a power-assisted motor (7) to rotate through a torque sensor (6), and an ECU controller (8) receives a CAN control signal and outputs a power-assisted current to enable the power-assisted motor (7) and the servo motor (5) to rotate in the same direction;
s4, configuring the lowest rotating speed and the highest rotating speed according to the test specification, controlling the ECU controller (8) to load the maximum power-assisted current by the industrial personal computer (1) to enable the rotating directions to be opposite to the same direction, and reading the torque value and the rotating speed of the power-assisted motor (7);
s5, controlling the rotating speed of the servo motor (5) to accelerate from 0 to the highest rotating speed by the industrial personal computer (1), and recording the servo motor torque under different rotating speeds in real time;
and S6, the industrial personal computer (1) stores the test data and automatically generates a motor characteristic curve.
8. The automatic test method for the external characteristics of the EPS motor according to claim 7, wherein the process that the industrial personal computer (1) controls the rotating speed of the servo motor (5) to accelerate from 0 to the highest rotating speed and records the servo motor torque under different rotating speeds in real time comprises the steps of,
s501, receiving a servo motor (5) to control a voltage servo controller (4) to control the output torque of the motor to change from 0N to 10N at a constant speed within T time, generating N torque instructions, setting the speed of acquiring the torque value of a torque sensor (6), and acquiring N torque values within T time;
s502, collecting n torque instructions to generate a first torque table, and collecting n torque values to generate a second torque table;
and S503, integrating the first torque table and the second torque table to generate a torque input value and torque sampling value corresponding table.
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Denomination of invention: An automated testing system and method for external characteristics of power assisted motors Granted publication date: 20210910 Pledgee: Zhejiang Fuyang Rural Commercial Bank branch Limited by Share Ltd. Silver Lake Pledgor: ZHEJIANG HANGQU AUTOMOBILE TECHNOLOGY CO.,LTD. Registration number: Y2024980003084 |