CN117804669A

CN117804669A - Calibration device and calibration method

Info

Publication number: CN117804669A
Application number: CN202410123468.3A
Authority: CN
Inventors: 魏敏; 梁静强; 任强; 黎谦; 张浩华
Original assignee: SAIC GM Wuling Automobile Co Ltd
Current assignee: SAIC GM Wuling Automobile Co Ltd
Priority date: 2024-01-29
Filing date: 2024-01-29
Publication date: 2024-04-02

Abstract

The embodiment of the application provides a calibration device and a calibration method, wherein the method comprises the following steps: the device comprises: an upper computer; the magnetic field control system is used for receiving a magnetic field intensity control instruction which is sent by the upper computer and contains target magnetic field intensity, and outputting a uniform magnetic field with the target magnetic field intensity; a torque sensor for outputting a first torque signal according to the target magnetic field strength; and the calibration box is used for collecting the first torque signal and calibrating the torque sensor according to the first torque signal. The uniform magnetic field containing the target magnetic field intensity is provided through the magnetic field control system, so that the magnitude of the induced magnetic field of the torque sensor is uniform during calibration, and the calibration result is accurate; meanwhile, the calibration box of the embodiment of the application can acquire the first torque signal without being matched with production line equipment, and calibrate the torque sensor according to the first torque signal, so that the calibration box is complete in function.

Description

Calibration device and calibration method

Technical Field

The application relates to the technical field of automobile power-assisted steering systems, in particular to a calibration device and a calibration method.

Background

At present, the calibration of a torque sensor on an automobile power-assisted steering system (E lectr ic Power Steering, EPS) is mostly carried out by controlling a servo motor or a steering motor to drive a steering column to rotate a magnetic pole rotor to a specific position, then utilizing a magnetic conduction sheet to change the magnetic field around the torque sensor, and then acquiring a torque signal for processing by a signal acquisition device for calibration. However, this method has the following drawbacks: 1. due to equipment tooling, a gap may exist between the placement position of the torque sensor and the ideal position, so that the magnitude of a sensed magnetic field is different, and calibration is influenced; 2. the acquisition equipment has single function and needs to be matched with other production line equipment for use.

Disclosure of Invention

In view of this, the application provides a calibration device and a calibration method to in favor of solving the problem that in the prior art, there may be a gap between the torque sensor placement position and the ideal position, resulting in different magnetic fields induced, affecting calibration and single function of the acquisition equipment, and needing to be matched with other production line equipment.

In a first aspect, embodiments of the present application provide a calibration device, the device including:

an upper computer;

the magnetic field control system is used for receiving a magnetic field intensity control instruction which is sent by the upper computer and contains target magnetic field intensity, and outputting a uniform magnetic field with the target magnetic field intensity;

A torque sensor for outputting a first torque signal according to the target magnetic field strength;

and the calibration box is used for collecting the first torque signal and calibrating the torque sensor according to the first torque signal. .

In one possible implementation, the magnetic field control system includes:

the Gaussian meter is used for collecting the magnetic field intensity of the magnetic field generator and outputting a magnetic field intensity signal;

the current output control board is used for receiving a magnetic field intensity control instruction and the magnetic field intensity signal which are sent by the upper computer and contain target magnetic field intensity, and outputting an adjusted current signal according to the magnetic field intensity control instruction and the magnetic field intensity signal;

and the magnetic field generator is used for adjusting the magnetic field intensity according to the adjusted current signal so as to output a uniform magnetic field with the target magnetic field intensity.

In one possible implementation, the target magnetic field strength includes a first target magnetic field strength and a second target magnetic field strength:

the step of collecting the first torque signal, and calibrating the torque sensor according to the first torque signal comprises the following steps:

when the target magnetic field strength is the first target magnetic field strength, a first sub-torque signal output by the torque sensor under the first target magnetic field is acquired, and zero calibration is performed on the torque sensor according to the first sub-torque signal;

And when the target magnetic field intensity is the second target magnetic field intensity, acquiring a second sub-torque signal output by the torque sensor under the second target magnetic field, and calibrating the slope of the torque sensor according to the second sub-torque signal.

In a possible implementation manner, the upper computer is further configured to send a calibration start instruction, where the calibration start instruction is used to instruct the magnetic field control system and the calibration box to start performing a calibration operation.

In one possible implementation, the calibration box is further configured to:

when the zero calibration of the torque sensor is successful, outputting a zero calibration success signal, wherein the zero calibration success signal is used for indicating the upper computer to output a second target magnetic field intensity;

when the slope calibration of the torque sensor is successful, outputting a slope calibration success signal, wherein the slope calibration success signal is used for indicating the upper computer to store the zero calibration and the slope calibration result;

and outputting a calibration failure signal when the zero calibration or the slope calibration of the torque sensor fails, wherein the calibration failure signal is used for indicating the upper computer to resend the calibration starting instruction.

In one possible implementation manner, the device further comprises a temperature control system, wherein the temperature control system is used for receiving a temperature field control instruction containing a target working temperature sent by the upper computer and outputting a temperature field with the target working temperature.

In one possible implementation, the torque sensor is further configured to output a second torque signal based on the target operating temperature;

the calibration box is also used for collecting the second torque signal and sending the second torque signal to the upper computer;

the upper computer is also used for processing the second torque signal and judging whether the torque sensor is qualified or not according to a processing result.

In one possible implementation, the temperature control system includes:

the thermocouple sensor is used for collecting the working temperature of the temperature field and outputting a temperature signal;

the temperature control board is used for receiving a temperature field control instruction and the temperature signal which are sent by the upper computer and contain target working temperature, and outputting a temperature control signal according to the temperature field control instruction and the temperature signal;

and the heat flow instrument is used for adjusting the working temperature of the temperature field according to the temperature control signal so as to output the temperature field with the target working temperature.

In one possible implementation manner, the upper computer is further configured to output a temperature performance test start instruction, where the temperature performance test start instruction is used to instruct the temperature control system and the calibration box to start performing a temperature performance test.

In one possible implementation manner, a display screen is arranged on the calibration box, and the display screen is a human-computer interaction display screen.

In a second aspect, an embodiment of the present application provides a calibration method, which is based on the calibration device of any one of the first aspect, including:

receiving a magnetic field intensity control instruction containing a target magnetic field intensity, and outputting a uniform magnetic field with the target magnetic field intensity;

outputting a first torque signal according to the target magnetic field strength;

and acquiring the first torque signal, and calibrating the torque sensor according to the first torque signal.

In one possible implementation, the receiving a magnetic field strength control instruction including a target magnetic field strength and outputting a uniform magnetic field having the target magnetic field strength includes:

collecting magnetic field intensity and outputting a magnetic field intensity signal according to the magnetic field intensity;

receiving a magnetic field intensity control command containing target magnetic field intensity and the magnetic field intensity signal, and outputting an adjusted current signal according to the magnetic field intensity control command and the magnetic field intensity signal;

And adjusting the magnetic field intensity according to the adjusted current signal so as to output a uniform magnetic field with the target magnetic field intensity.

when the target magnetic field strength is a first target magnetic field strength, acquiring a first sub-torque signal output under the first target magnetic field, and performing zero calibration on the torque sensor according to the first sub-torque signal;

and when the target magnetic field strength is the second target magnetic field strength, acquiring a second sub-torque signal output under the second target magnetic field, and calibrating the slope of the torque sensor according to the second sub-torque signal.

In one possible implementation, the method further comprises;

when the zero calibration of the torque sensor is successful, the magnetic field intensity is adjusted to be the second target magnetic field intensity;

when the slope calibration of the torque sensor is successful, storing the zero calibration and the slope calibration result;

And when the zero calibration of the torque sensor fails or the slope calibration fails, re-executing zero calibration operation.

In one possible implementation, the method further includes:

receiving a temperature field control instruction containing a target working temperature, and outputting a temperature field with the target working temperature;

outputting a second torque signal according to the target working temperature;

and processing the second torque signal, and judging whether the torque sensor is qualified or not according to a processing result.

In one possible implementation, the receiving a temperature field control command including a target operating temperature and outputting a temperature field having the target operating temperature includes:

collecting the working temperature of the temperature field and outputting a temperature signal;

receiving the temperature field control instruction containing the target working temperature and the temperature signal, and outputting a temperature control signal according to the temperature field control instruction and the temperature signal;

and adjusting the working temperature of the temperature field according to the temperature control signal so as to output the temperature field with the target working temperature.

Compared with the prior art, the embodiment of the application provides the uniform magnetic field containing the target magnetic field strength through the magnetic field control system, so that the magnitude of the induced magnetic field of the torque sensor is uniform during calibration, and the calibration result is accurate; meanwhile, the calibration box of the embodiment of the application can acquire the first torque signal without being matched with production line equipment, and calibrate the torque sensor according to the first torque signal, so that the calibration box is complete in function.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic structural diagram of a calibration device according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a calibration box according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of another calibration device according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of another calibration device according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of another calibration device according to an embodiment of the present disclosure;

FIG. 6 is a schematic flow chart of a calibration method according to an embodiment of the present application;

FIG. 7 is a schematic flow chart of another calibration method according to an embodiment of the present application;

fig. 8 is a schematic flow chart of another calibration method according to an embodiment of the present application.

Detailed Description

For a better understanding of the technical solutions of the present application, embodiments of the present application are described in detail below with reference to the accompanying drawings.

It should be understood that the described embodiments are merely some, but not all, of the embodiments of the present application. All other embodiments, based on the embodiments herein, which would be apparent to one of ordinary skill in the art without making any inventive effort, are intended to be within the scope of the present application.

The terminology used in the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one way of describing an association of associated objects, meaning that there may be three relationships, e.g., a and/or b, which may represent: the first and second cases exist separately, and the first and second cases exist separately. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The torque sensor is an instrument for measuring torque and torsion angle and is widely applied to various fields of automobiles, aviation, ships and the like. In practical applications, to ensure accuracy and reliability of measurement results, it is often necessary to calibrate the torque sensor periodically. The calibration of the torque sensor means that the output value of the torque sensor is compared with a standard value through experimental test, and the torque sensor is calibrated according to a comparison result so as to ensure that the torque sensor can accurately measure the torque. Common torque sensor calibration comprises zero calibration and slope calibration, wherein the zero calibration aims at eliminating zero error of the torque sensor and enabling the zero error to be displayed as zero when no input signal or measurement object is available, and the slope calibration aims at correcting linearity of the torque sensor and enabling the torque sensor to maintain good linearity in the whole measurement range.

At present, the calibration of a torque sensor on an automobile power-assisted steering system (E lectr ic Power Steer ing, EPS) is mostly carried out by controlling a servo motor or a steering motor to drive a steering column to rotate a magnetic pole rotor to a specific position, then utilizing a magnetic conduction sheet to change the magnetic field around the torque sensor, and then acquiring a torque signal for processing by a signal acquisition device for calibration. However, this method has the following drawbacks: 1. due to equipment tooling, a gap may exist between the placement position of the torque sensor and the ideal position, so that the magnitude of a sensed magnetic field is different, and calibration is influenced; 2. the acquisition equipment has single function and needs to be matched with other production line equipment for use.

Aiming at the problems, the embodiment of the application provides a calibration device and a calibration method, wherein a magnetic field control system is used for providing a uniform magnetic field containing target magnetic field intensity, so that the magnitude of a magnetic field induced by a torque sensor during calibration is uniform, and the calibration result is accurate; meanwhile, the calibration box of the embodiment of the application can acquire the first torque signal without being matched with production line equipment, and calibrate the torque sensor according to the first torque signal, so that the calibration box is complete in function.

The following is a detailed description.

Referring to fig. 1, a schematic structural diagram of a calibration device according to an embodiment of the present application is provided. As shown in fig. 1, the calibration device includes a host computer 100, a magnetic field control system 200, a torque sensor 300 and a calibration box 400, wherein the host computer 100 is in communication connection with the magnetic field control system 200 through CAN communication, the magnetic field control system 200 is used for providing a uniform magnetic field, the torque sensor 300 is placed at the uniform magnetic field of the magnetic field control system 200, the torque sensor 300 is in communication connection with the calibration box 400 through a serial port, and the calibration box 400 is in communication connection with the host computer 100 through RS232 communication/CAN communication. In the calibration process, the upper computer 100 is used for sending a magnetic field intensity control instruction containing a target magnetic field intensity to the magnetic field control system 200, the magnetic field control system 200 is used for outputting a uniform magnetic field with the target magnetic field intensity according to the magnetic field intensity control instruction containing the target magnetic field intensity, the torque sensor 300 is used for outputting a first torque signal according to the target magnetic field intensity, the calibration box 400 is used for collecting the first torque signal, and the calibration process is performed on the torque sensor 300 according to the first torque signal.

In a specific implementation, the communication network between the upper computer 100 and the magnetic field control system 200, and between the calibration box 400 and the upper computer 100 may be a wifi hotspot network, a wifi P2P network, a bluetooth network, a zigbee network, or a near field communication (near field communication, NFC) network. This is not a particular requirement of the embodiments of the present application. It should be noted that in some embodiments, the upper computer 100 may also be referred to as a host or a control device.

In a possible implementation, the upper computer 100 is further configured to send a calibration start instruction to the magnetic field control system 200 and the calibration box 400 at the start of calibration, where the calibration start instruction is used to instruct the magnetic field control system 200 and the calibration box 400 to start performing a calibration operation. In particular embodiments, the calibration operation for the torque sensor 300 includes zero calibration and slope calibration, the zero calibration is to calibrate the zero point of the torque sensor when no input signal is present, i.e. the magnetic field strength is 0, so as to eliminate zero point error, the slope calibration is to calibrate the slope of the torque sensor in the torque measurement range, so as to compensate the nonlinear characteristic of the torque sensor, thus, according to the calibration procedure, the zero calibration of the torque sensor 300 is generally performed first, and then the slope calibration of the torque sensor 300 is performed after the zero calibration is successful, so that the calibration start instruction is specifically used to instruct the magnetic field control system 200 and the calibration box 400 to start performing the zero calibration operation, and to perform the slope calibration operation after the zero calibration is successful.

In one possible implementation, the upper computer 100 is further configured to send the target magnetic field strength to the magnetic field control system 200 after the magnetic field control system 200 starts performing the null calibration operation. In particular, the target magnetic field strength includes a first target magnetic field strength and a second target magnetic field strength, the first target magnetic field strength is used for zero calibration of the torque sensor 300, and the second target magnetic field strength is used for slope calibration of the torque sensor 300, so that according to the calibration procedure, the upper computer 100 sends the first target magnetic field strength to the magnetic field control system 200 after the magnetic field control system 200 starts to perform zero calibration operation, and sends the second target magnetic field strength to the magnetic field control system 200 after the zero calibration is successful. For example, the first target magnetic field strength may be 0gs and the second target magnetic field strength may be 250gs.

In one possible implementation, after receiving the calibration start instruction sent by the host computer 100, the magnetic field control system 200 starts to perform the zero calibration operation, and adjusts the magnetic field strength to the target magnetic field strength after receiving the target magnetic field strength sent by the host computer 100.

In particular implementations, referring to fig. 1, the magnetic field control system 200 may be a magnetic field PID closed loop control system, including a gauss meter 210, a current output control board 220, and a magnetic field generator 230, where the gauss meter 210 is configured to collect a magnetic field strength of the magnetic field generator 230 and output a magnetic field strength signal; the current output control board 220 is configured to receive a magnetic field intensity control command including a target magnetic field intensity and a magnetic field intensity signal output by the gaussmeter 210, which are sent by the upper computer 100, and output an adjusted current signal according to the magnetic field intensity control command and the magnetic field intensity signal; the magnetic field generator 230 is used for adjusting the magnetic field intensity according to the adjusted current signal to output a uniform magnetic field having the target magnetic field intensity. Specifically, the current output control board 220 collects the magnetic field intensity signal output by the gaussmeter 210 through RS232 communication, compares the magnetic field intensity signal with the received target magnetic field intensity, adjusts the output current signal according to the difference between the magnetic field intensity signal and the target magnetic field intensity when the magnetic field intensity signal is inconsistent with the target magnetic field intensity, and changes the output magnetic field intensity according to the adjusted current signal after the magnetic field generator 230 receives the adjusted current signal.

According to the embodiment of the application, the output magnetic field intensity is dynamically regulated through the magnetic field PID closed-loop control system, the magnetic field intensity finally reaches the target magnetic field intensity, the controllability and the accuracy of the magnetic field intensity are guaranteed, and meanwhile, the magnetic field generator can generate a uniform magnetic field, and the accuracy and the reliability of the calibration of the torque sensor are guaranteed.

In particular embodiments, the current output control board 220 is further communicatively connected to the calibration box 400, and is configured to send a notification to the calibration box 400 when the magnetic field strength is adjusted to the target magnetic field strength, so that the calibration box 400 collects a torque signal under the target magnetic field strength to perform the calibration process.

In one possible implementation, the torque sensor 300 is placed at the uniform magnetic field of the magnetic field generator 230 before calibration begins and outputs a corresponding torque signal based on the sensed magnetic field strength after calibration begins, the torque sensor 300 outputting a first torque signal at a target magnetic field strength, the torque sensor 300 outputting a first sub-torque signal when the target magnetic field strength is the first target magnetic field strength and the torque sensor 300 outputting a second sub-torque signal when the target magnetic field strength is the second target magnetic field strength.

In practice, the torque sensor may also be referred to as a torque sensor, torque sensor or torque sensor.

In one possible implementation manner, after receiving the calibration start instruction sent by the upper computer 100, the calibration box 400 acquires the torque signal output by the torque sensor in real time, and displays the torque signal in real time through a display screen of the calibration box, or sends the acquired data to the upper computer 100 for real time display through CAN communication or RS232 communication, and after receiving the notification sent by the current output control board 220, acquires the torque signal under the target magnetic field for calibration processing. Specifically, when the target magnetic field strength is the first target magnetic field strength, the calibration box 400 collects a first sub-torque signal output by the torque sensor 300 under the first target magnetic field, and performs zero calibration on the torque sensor 300 according to the first sub-torque signal, and when the target magnetic field strength is the second target magnetic field strength, the calibration box 400 collects a second sub-torque signal output by the torque sensor 300 under the second target magnetic field, and performs slope calibration on the torque sensor 300 according to the second sub-torque signal. For example, when the first target magnetic field strength is 0gs, the calibration box 400 collects the first sub-torque signal output by the torque sensor 300 at 0gs, and performs zero calibration on the torque sensor 300 according to the first sub-torque signal, where in reality, the output value (output voltage value) of the first sub-torque signal after zero calibration is 2.5V; when the second target magnetic field strength is 250gs, the calibration box 400 collects a second sub-torque signal output by the torque sensor 300 under 250gs, and performs slope calibration on the torque sensor 300 based on the zero calibration result and the second sub-torque signal.

In one possible implementation, when the calibration box 400 performs zero calibration on the torque sensor 300 successfully, a zero calibration success signal is output, and the zero calibration success signal is used for indicating the upper computer 100 to output the second target magnetic field strength; when the calibration box 400 is successful in calibrating the slope of the torque sensor 300, a slope calibration success signal is output, and the slope calibration success signal is used for indicating the upper computer 100 to store zero calibration and slope calibration results; when the calibration box 400 fails to calibrate the zero position or the slope of the torque sensor 300, a calibration failure signal is output, and the calibration failure signal is used for indicating the upper computer 100 to resend a calibration start instruction.

In some embodiments, the calibration failure signal is further used to instruct the upper computer 100 to output a calibration failure result, and directly end the calibration until the user selects to start calibration again, and then the upper computer 100 resends a calibration start instruction to instruct the magnetic field control system 200 and the calibration box 400 to start performing the calibration operation.

Unlike the prior art, referring to fig. 2, in the embodiment of the present application, the calibration box 400 is provided with a display screen 410, and data collected by the calibration box 400, calibration process, calibration result, and the like may be displayed by the display screen 410, and the display screen 410 may be a serial display screen, for example.

In one possible implementation, the display screen 410 may be configured as a man-machine interaction display screen, and the user may perform parameter setting and instruction output through the man-machine interaction display screen, where numerous instructions for the whole calibration process may be issued by the calibration box. Based on this, the present application provides another calibration device.

Referring to fig. 3, a schematic structural diagram of another calibration device according to an embodiment of the present application is provided. As shown in fig. 3, the calibration device comprises a magnetic field control system 200, a torque sensor 300 and a calibration box 400, wherein the calibration box 400 is in communication connection with the magnetic field control system 200 through RS232 communication/CAN communication, the magnetic field control system 200 is used for providing a uniform magnetic field, the torque sensor 300 is placed at the uniform magnetic field of the magnetic field control system 200, and the torque sensor 300 is in communication connection with the calibration box 400 through a serial port. In the calibration process, the calibration box 400 is used for sending a magnetic field intensity control command containing a target magnetic field intensity to the magnetic field control system 200, the magnetic field control system 200 is used for outputting a uniform magnetic field with the target magnetic field intensity according to the magnetic field intensity control command containing the target magnetic field intensity, the torque sensor 300 is used for outputting a first torque signal according to the target magnetic field intensity, the calibration box 400 is also used for collecting the first torque signal, and the calibration processing is performed on the torque sensor 300 according to the first torque signal.

In one possible implementation, the calibration box 400 is further configured to send a calibration start instruction to the magnetic field control system 200 and the torque sensor 300, where the calibration start instruction is configured to instruct the magnetic field control system 200 and the torque sensor 300 to start performing a zero calibration operation.

In one possible implementation, the calibration box 400 is further configured to send the target magnetic field strength to the magnetic field control system 200 after the magnetic field control system 200 begins performing a null calibration operation. In particular embodiments, the target magnetic field strength includes a first target magnetic field strength and a second target magnetic field strength, where the first target magnetic field strength is used for zero calibration of the torque sensor 300, and the second target magnetic field strength is used for slope calibration of the torque sensor 300, so that according to the calibration procedure, the calibration box 400 sends the first target magnetic field strength to the magnetic field control system 200 after the magnetic field control system 200 starts to perform zero calibration operation, and sends the second target magnetic field strength to the magnetic field control system 200 after the zero calibration is successful. For example, the first target magnetic field strength may be 0gs and the second target magnetic field strength may be 250gs.

In this embodiment, the description of the magnetic field control system 200 and the torque sensor 300 may refer to the description of the magnetic field control system 200 and the torque sensor 300 in the embodiment of fig. 1, and for brevity, the description is omitted herein.

In the embodiment of the application, the upper computer equipment is omitted, and the functions executed by the upper computer are integrated on the calibration box, so that the functions of the calibration box are more comprehensive, the application range is wider, and the convenient use of multiple scenes can be realized.

In practical application, the torque signal output by the torque sensor is also affected by the working temperature of the torque sensor, so that the temperature performance of the torque sensor is required to be tested after the calibration work of the torque sensor is completed.

Referring to fig. 4, a schematic structural diagram of another calibration device according to an embodiment of the present application is provided. As shown in fig. 4, the apparatus includes a host computer 100, a temperature control system 500, a torque sensor 300, and a calibration box 400. The upper computer 100 is in communication connection with the temperature control system 500 through CAN communication, the temperature control system 500 is used for providing a uniform and stable temperature field, the torque sensor 300 is placed at the uniform temperature field of the temperature control system 500, the torque sensor 300 is in communication connection with the calibration box 400 through a serial port, and the calibration box 400 is in communication connection with the upper computer 100 through RS232 communication/CAN communication. In the test process, the upper computer 100 is configured to send a temperature field control instruction including a target operating temperature to the temperature control system 500, the temperature control system 500 is configured to output a temperature field having the target operating temperature according to the temperature field control instruction including the target operating temperature, the torque sensor 300 is configured to output a second torque signal according to the target operating temperature, the calibration box 400 is configured to collect the second torque signal, and send the second torque signal to the upper computer 100; the upper computer 100 is further configured to process the second torque signal, and determine whether the torque sensor 300 is qualified according to the processing result.

In a specific implementation, the communication network between the upper computer 100 and the temperature control system 500, and between the calibration box 400 and the upper computer 100 may also be a wifi hotspot network, a wifi P2P network, a bluetooth network, a zigbee network, or a near field communication (near fie ld communicat ion, NFC) network. This is not a particular requirement of the embodiments of the present application.

In one possible implementation, the upper computer 100 is further configured to send a temperature performance test start instruction to the temperature control system 500 and the calibration box 400, where the temperature performance test start instruction is used to instruct the temperature control system 500 and the calibration box 400 to start performing a temperature performance test.

In one possible implementation, the upper computer 100 is further configured to send the target operating temperature to the temperature control system 500 after the temperature control system 500 starts to perform the temperature performance test operation. In a specific implementation, the target working temperature may be set to be multiple, so as to test the performance of the torque sensor 300 at different working temperatures, and ensure the comprehensiveness of the test result. By way of example, the target operating temperature may be set at 20 ℃, 25 ℃, 30 ℃, 35 ℃, 40 ℃, 45 ℃, etc.

In one possible implementation, after receiving the temperature performance test start instruction sent by the upper computer 100, the temperature control system 500 starts to perform the temperature performance test operation, and adjusts the operating temperature of the temperature field to the target operating temperature after receiving the target operating temperature sent by the upper computer 100.

In particular, referring to fig. 4, the temperature control system 500 may be a temperature PID closed loop control system, including a thermocouple sensor 510, a temperature control board 520, and a heat flow meter 530, where the thermocouple sensor 510 is configured to collect an operating temperature of a temperature field and output a temperature signal; the temperature control board 520 is configured to receive a temperature field control instruction including a target operating temperature and a temperature signal output by the thermocouple sensor 510 and output a temperature control signal according to the temperature field control instruction and the temperature signal, which are sent by the host computer 100; the heat flow meter 530 is used for adjusting the operating temperature of the temperature field according to the temperature control signal to output the temperature field having the target operating temperature. Specifically, the temperature control board 520 collects the temperature signal output by the thermocouple sensor 510 through RS232 communication, compares the temperature signal with the received target operating temperature, adjusts the output current signal according to the difference between the temperature signal and the target operating temperature when the temperature signal is inconsistent with the target operating temperature, and changes the operating temperature according to the adjusted current signal after the heat flow meter 530 receives the adjusted current signal.

According to the embodiment of the application, the output working temperature is dynamically regulated through the temperature PID closed-loop control system, and finally the working temperature reaches the target working temperature, so that the controllability and the accuracy of the working temperature are guaranteed, and meanwhile, the heat flow instrument can generate a uniform temperature field, and the accuracy and the reliability of the temperature performance test of the torque sensor are guaranteed.

In a specific implementation, the temperature control board 520 is further in communication with the calibration box 400, and is configured to send a notification to the calibration box 400 that the target operating temperature adjustment is completed when the operating temperature of the temperature field is adjusted to the target operating temperature, so that the calibration box 400 collects a torque signal at the target operating temperature.

In one possible implementation, the torque sensor 300 is placed at a uniform temperature of the heat flow meter 530 before the temperature performance test begins and outputs a corresponding torque signal based on the sensed operating temperature after the temperature performance test begins. Illustratively, the torque sensor 300 outputs a second torque signal when the operating temperature is the target operating temperature.

In a possible implementation manner, after receiving a temperature performance test start instruction sent by the upper computer 100, the calibration box 400 acquires a torque signal output by the torque sensor in real time, and displays the torque signal in real time through a display screen of the calibration box, or sends acquired data to the upper computer 100 for real time display through CAN communication or RS232 communication, and after receiving a notification sent by the temperature control board 520, acquires a second torque signal at a target working temperature, sends the second torque signal to the upper computer 100, and the upper computer 100 performs temperature performance test data processing.

In one possible implementation, the second torque signal collected by the calibration box 400 may also be processed by the calibration box 400, and the calibration box 400 determines whether the torque sensor 300 is qualified according to the processing result of the second torque signal.

In a specific implementation, when the target working temperatures are multiple, the calibration box 400 or the upper computer 100 judges whether the results of the torque sensor 300 are qualified or not to include the results of the multiple target working temperatures, only when the torque sensor 300 is qualified at the multiple target working temperatures, the calibration box 400 or the upper computer 100 can output the conclusion that the torque sensor 300 is qualified, and when the torque sensor is unqualified at certain working temperatures, the calibration box 400 or the upper computer 100 can output the conclusion that the torque sensor 300 is unqualified and give the specific unqualified target working temperature.

When the torque sensor 300 is failed, the failure cause of the torque sensor 300 may be analyzed, and the temperature performance test may be re-performed based on the analysis result selection. For example, when the failure cause is due to an external cause such as voltage instability, test line failure, etc., the temperature performance test may be re-performed after the external factor is removed.

In the embodiment of the application, the upper computer can be removed, the functions executed by the upper computer are integrated on the calibration box, and the calibration box executes the sending of the temperature performance test start instruction and the sending of the target working temperature.

Referring to fig. 5, a schematic structural diagram of another calibration device according to an embodiment of the present application is provided. As shown in fig. 4, the apparatus includes a temperature control system 500, a torque sensor 300, and a calibration box 400. The calibration box 400 is in communication connection with the temperature control system 500 through CAN communication, the temperature control system 500 is used for providing a uniform and stable temperature field, the torque sensor 300 is placed at the uniform temperature field of the temperature control system 500, and the torque sensor 300 is in communication connection with the calibration box 400 through a serial port. In the test process, the calibration box 400 is used for sending a temperature field control instruction containing a target working temperature to the temperature control system 500, the temperature control system 500 is used for outputting a temperature field with the target working temperature according to the temperature field control instruction containing the target working temperature, the torque sensor 300 is used for outputting a second torque signal according to the target working temperature, the calibration box 400 is also used for collecting the second torque signal, processing the second torque signal and judging whether the torque sensor 300 is qualified according to the processing result.

In one possible implementation, the calibration box 400 is further configured to send a temperature performance test start instruction to the temperature control system 500 and the torque sensor 300, where the temperature performance test start instruction is configured to instruct the temperature control system 500 and the torque sensor 300 to start performing the temperature performance test.

In one possible implementation, the calibration box 400 is further configured to send the target operating temperature to the temperature control system 500 after the temperature control system 500 begins performing the temperature performance test operation. In a specific implementation, the target working temperature may be set to be multiple, so as to test the performance of the torque sensor 300 at different working temperatures, and ensure the comprehensiveness of the test result. By way of example, the target operating temperature may be set at 20 ℃, 25 ℃, 30 ℃, 35 ℃, 40 ℃, 45 ℃, etc.

In this embodiment of the present application, the descriptions of the temperature control system 500 and the torque sensor 300 may refer to the descriptions of the temperature control system 500 and the torque sensor 300 in the embodiment of fig. 4, and are not repeated herein for brevity.

Compared with the prior art, the embodiment of the application has the following technical effects:

according to the embodiment of the application, a uniform and stable magnetic field and an accurate temperature environment are provided for the torque sensor through magnetic field PID closed-loop control and temperature PID closed-loop control, so that calibration and test results are more reliable;

According to the embodiment of the application, the display screens of the upper computer and the calibration box can be used for checking torque signal data, calibration progress, calibration results, test progress and test results in real time, and man-machine interaction and instruction output can be performed through the upper computer interface and the calibration box interface, so that multi-scene convenient use is realized;

the calibration box of the embodiment of the application can not only calibrate the torque chip, but also perform other performance tests, is multipurpose and saves cost;

the embodiment of the application can be used as calibration equipment of a torque sensor production line, realizes automatic detection and greatly improves the production efficiency of products;

the embodiment of the application has CAN communication interfaces and RS232 communication interfaces, CAN use any communication mode to carry out function expansion, and is flexible and convenient to use.

It should be appreciated that the illustrations in the embodiments above are intended to assist those skilled in the art in understanding the embodiments of the application, and are not intended to limit the embodiments of the application to the particular values or particular scenarios illustrated. It will be apparent to those skilled in the art from the foregoing description that various equivalent modifications or variations can be made, and such modifications or variations are intended to be within the scope of the embodiments of the present application.

The calibration device provided in the embodiment of the present application is described in detail above with reference to fig. 1 to 5, and the method embodiment of the present application will be described in detail below with reference to fig. 6 to 8. It should be understood that the method in the embodiment of the present application may be applied to the corresponding apparatus in the embodiment of the present application, that is, the following specific flow of the various methods may refer to the corresponding descriptions in the embodiment of the apparatus.

Referring to fig. 6, a flow chart of a calibration method according to an embodiment of the present application is provided. As shown in fig. 6, the method is applicable to the apparatus shown in fig. 1 and 3, and the specific steps are as follows:

s601: the magnetic field control system receives a magnetic field strength control instruction containing a target magnetic field strength and outputs a uniform magnetic field having the target magnetic field strength.

In one possible implementation, the magnetic field control system may be a magnetic field PID closed loop control system, including a gauss meter, a current output control board, and a magnetic field generator, where the gauss meter is configured to collect a magnetic field strength of the magnetic field generator and output a magnetic field strength signal according to the magnetic field strength; the current output control board is used for receiving a magnetic field intensity control instruction and a magnetic field intensity signal containing target magnetic field intensity and outputting an adjusted current signal according to the magnetic field intensity control instruction and the magnetic field intensity signal; the magnetic field generator is used for adjusting the magnetic field intensity according to the adjusted current signal so as to output a uniform magnetic field with target magnetic field intensity.

In one possible implementation, the target magnetic field strength includes a first target magnetic field strength for null calibration of the torque sensor and a second target magnetic field strength for slope calibration of the torque sensor. In a specific implementation, after receiving the first target magnetic field strength or the second target magnetic field strength, the magnetic field control system dynamically adjusts the magnetic field strength of the magnetic field generator so that the magnetic field strength of the magnetic field generator reaches the first target magnetic field strength or the second target magnetic field strength.

S602: the torque sensor outputs a first torque signal according to the target magnetic field strength.

In one possible implementation, the torque sensor is placed at a uniform magnetic field of the magnetic field generator and outputs a corresponding torque signal according to the sensed magnetic field strength after calibration begins, and illustratively, the torque sensor outputs a first torque signal at a target magnetic field strength, the torque sensor outputs a first sub-torque signal when the target magnetic field strength is the first target magnetic field strength, and the torque sensor outputs a second sub-torque signal when the target magnetic field strength is the second target magnetic field strength.

S603: the calibration box collects a first torque signal and performs calibration processing on the torque sensor according to the first torque signal.

In one possible implementation, after the magnetic field control system adjusts the magnetic field strength to the target magnetic field strength, a notification is sent to the calibration box, so that the calibration box collects the torque signal under the target magnetic field strength for calibration processing. Specifically, when the target magnetic field strength is the first target magnetic field strength, the calibration box collects a first sub-torque signal output by the torque sensor under the first target magnetic field, zero calibration is performed on the torque sensor according to the first sub-torque signal, and when the target magnetic field strength is the second target magnetic field strength, the calibration box collects a second sub-torque signal output by the torque sensor under the second target magnetic field, and slope calibration is performed on the torque sensor according to the second sub-torque signal.

In one possible implementation manner, when the calibration box is successful in calibrating the zero position of the torque sensor, a zero position calibration success signal is output, and the zero position calibration success signal is used for indicating the upper computer to output a second target magnetic field intensity so that the magnetic field control system adjusts the magnetic field intensity to the second target magnetic field intensity; when the slope calibration of the torque sensor by the calibration box is successful, a slope calibration success signal is output, and the slope calibration success signal is used for indicating an upper computer to store zero calibration and slope calibration results; when the calibration fails to zero calibration or slope calibration of the torque sensor, a calibration failure signal is output, and the calibration failure signal is used for indicating the upper computer to resend a calibration starting instruction so as to enable the magnetic field control system and the calibration box to execute zero calibration operation again.

In some embodiments, the calibration failure signal is further used for indicating the upper computer to output a calibration failure result, and directly ending the calibration until the user selects to start calibration again, and then the upper computer resends a calibration start instruction to instruct the magnetic field control system and the calibration box to start executing zero calibration operation.

In one possible implementation, in the apparatus shown in fig. 1, the upper computer is further configured to send a calibration start instruction to the magnetic field control system and the calibration box at the start of calibration, where the calibration start instruction is configured to instruct the magnetic field control system and the calibration box to start performing a zero calibration operation.

In a possible implementation manner, in the apparatus shown in fig. 1, the upper computer is further configured to send the first target magnetic field strength to the magnetic field control system after the magnetic field control system starts to perform the zero calibration operation, and send the second target magnetic field strength to the magnetic field control system after the zero calibration is successful.

In one possible implementation, in the apparatus shown in fig. 2, the calibration box is further configured to send a calibration start instruction to the magnetic field control system and the torque sensor at the start of calibration, the calibration start instruction being configured to instruct the magnetic field control system and the torque sensor to start performing a zero calibration operation.

In a possible implementation, in the apparatus shown in fig. 2, the calibration box is further configured to send the first target magnetic field strength to the magnetic field control system after the magnetic field control system starts performing the zero calibration operation, and send the second target magnetic field strength to the magnetic field control system after the zero calibration is successful.

The embodiment of the application provides a uniform and stable magnetic field which can be adjusted according to the calibration requirement through the magnetic field control system, so that the reliability of the calibration result of the torque sensor is ensured, and meanwhile, the embodiment of the application can be used as calibration equipment of a torque sensor production line, so that the automatic detection of the torque sensor is realized, and the production efficiency is greatly improved.

The calibration method is described in detail below in connection with specific implementations.

Referring to fig. 7, a flow chart of another calibration method according to an embodiment of the present application is provided. As shown in fig. 7, after calibration starts, the magnetic field PID closed loop control system adjusts the magnetic field strength to X1gs according to the received first target magnetic field strength, and notifies the calibration box that the magnetic field adjustment is completed, the calibration box performs zero calibration according to the first sub-torque signal notified that the acquisition torque sensor outputs at the first target magnetic field strength, calculates a correction value, if the zero calibration fails, re-performs zero calibration operation, if the zero calibration succeeds, the magnetic field PID closed loop control system adjusts the magnetic field strength to X2gs according to the received second target magnetic field strength, notifies the calibration box that the magnetic field adjustment is completed, the calibration box performs slope according to the second sub-torque signal notified that the acquisition torque sensor outputs at the second target magnetic field strength, calculates the correction value, if the slope calibration fails, re-performs zero calibration operation, and if the slope calibration succeeds, stores the zero calibration and the slope calibration result.

In the embodiment shown in fig. 7, the first target magnetic field strength and the second target magnetic field strength received by the magnetic field PID closed loop control system may be transmitted by a host computer or a calibration box.

Referring to fig. 8, a flow chart of another calibration method according to an embodiment of the present application is provided. As shown in fig. 8, the method is applicable to the apparatus shown in fig. 4 and 5, and the specific steps are as follows:

s801: the temperature control system receives a temperature field control command including a target operating temperature and outputs a temperature field having the target operating temperature.

In one possible implementation, the temperature control system may be a temperature PID closed loop control system, including a thermocouple sensor, a temperature control board, and a heat flow meter, where the thermocouple sensor is used to collect the working temperature of the temperature field and output a temperature signal; the temperature control board is used for receiving a temperature field control instruction containing target working temperature and a temperature signal output by the thermocouple sensor and sent by the upper computer, and outputting a temperature control signal according to the temperature field control instruction and the temperature signal; the heat flow meter is used for adjusting the working temperature of the temperature field according to the temperature control signal so as to output the temperature field with the target working temperature.

In one possible implementation, the temperature control board is also in communication with the calibration box for sending a notification to the calibration box that the target operating temperature adjustment has been completed when the operating temperature of the temperature field is adjusted to the target operating temperature.

S802: the torque sensor outputs a second torque signal according to the target operating temperature.

In one possible implementation, the torque sensor is placed at a uniform temperature of the heat flow meter before the start of the temperature performance test, and outputs a corresponding torque signal based on the sensed operating temperature after the start of the temperature performance test. For example, the torque sensor outputs a second torque signal when the operating temperature is the target operating temperature.

S803: and the upper computer processes the second torque signal and judges whether the torque sensor is qualified or not according to a processing result.

In one possible implementation manner, the calibration box collects a second torque signal output by the torque sensor at the target working temperature, the second torque signal is sent to the upper computer, and after the upper computer receives the second torque signal, the upper computer processes the second torque signal and judges whether the torque sensor is qualified or not according to a processing result.

In the specific implementation, the calibration box collects torque signals output by the torque sensor in real time, and displays the torque signals in real time through a display screen of the calibration box, or sends collected data to the upper computer for real-time display, and after receiving a notification sent by the temperature control board and used for completing target working temperature adjustment, the calibration box collects second torque signals output by the torque sensor at the target working temperature and sends the second torque signals to the upper computer.

In one possible implementation manner, the second torque signal collected by the calibration box can also be processed by the calibration box, and the calibration box judges whether the torque sensor is qualified according to the processing result of the second torque signal.

In one possible implementation, in the apparatus shown in fig. 4, the upper computer is further configured to send a temperature performance test start instruction to the temperature control system and the calibration box at the start of the temperature performance test, where the temperature performance test start instruction is used to instruct the temperature control system and the calibration box to start performing the temperature performance test operation.

In one possible implementation, in the apparatus shown in fig. 4, the upper computer is further configured to send the target operating temperature to the temperature control system after the temperature control system starts to perform the temperature performance test operation.

In one possible implementation, in the apparatus shown in fig. 5, the calibration box is further configured to send a temperature performance test start instruction to the temperature control system and the torque sensor at the start of the temperature performance test, where the temperature performance test start instruction is configured to instruct the temperature control system and the torque sensor to start performing the temperature performance test operation.

In one possible implementation, in the apparatus shown in fig. 5, the calibration box is further configured to send the target operating temperature to the temperature control system after the temperature control system begins to perform the temperature performance test operation.

According to the embodiment of the application, the temperature field which is uniform and stable and adjustable in temperature is provided through the temperature control system, and the accuracy of the temperature performance test of the torque sensor is guaranteed. Meanwhile, the embodiment of the application can check torque signal data, calibration progress, calibration results, test progress and test results in real time through the display screens of the upper computer and the calibration box, and can also perform man-machine interaction and instruction output through the upper computer interface and the calibration box interface, so that multi-scene convenient use is realized.

Corresponding to the above embodiments, the embodiments of the present application further provide a computer readable storage medium, in which instructions are stored, which when run on a computer, cause the computer to perform part of the implementation steps of the calibration method of the embodiments of the present application.

In particular implementations, embodiments of the present application also provide a computer program product comprising instructions that, when executed on a computer or on any of the at least one processors, cause the computer to perform some of the steps of implementing the calibration methods of embodiments of the present application.

In a specific implementation, the embodiment of the application further provides a chip, which comprises a processor and a data interface, wherein the processor reads instructions stored in a memory through the data interface so as to execute corresponding operations and/or processes executed by the calibration method.

Optionally, the chip further comprises a memory, the memory is connected with the processor through a circuit or a wire, and the processor is used for reading and executing the computer program in the memory. Further optionally, the chip further comprises a communication interface, and the processor is connected to the communication interface. The communication interface is used for receiving data and/or information to be processed, and the processor acquires the data and/or information from the communication interface and processes the data and/or information. The communication interface may be an input-output interface.

The memory may be read-only memory (ROM), other types of static storage devices that can store static information and instructions, random access memory (random access memory, RAM) or other types of dynamic storage devices that can store information and instructions, electrically erasable programmable read-only memory (electrically erasable programmable read-only memory, EEPROM), compact disc read-only memory (compact disc read-only memory) or other optical disk storage, optical disk storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media, or any other magnetic storage device that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, etc.

In this embodiment, "and/or" describes an association relationship of an association object, which means that there may be three relationships, for example, a and/or B, and may mean that there is a alone, a and B together, and B alone. Wherein A, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of the following" and the like means any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural.

Those of ordinary skill in the art will appreciate that the various elements and algorithm steps described in the embodiments disclosed herein can be implemented as a combination of electronic hardware, computer software, and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In several embodiments provided herein, any of the functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely specific embodiments of the present application, and any person skilled in the art may easily conceive of changes or substitutions within the technical scope of the present application, which should be covered by the protection scope of the present application. The protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A calibration device, the device comprising:

an upper computer;

and the calibration box is used for collecting the first torque signal and calibrating the torque sensor according to the first torque signal.

2. The apparatus of claim 1, wherein the magnetic field control system comprises:

3. The apparatus of claim 1, wherein the target magnetic field strength comprises a first target magnetic field strength and a second target magnetic field strength:

4. The apparatus of claim 3, wherein the host computer is further configured to send a calibration start instruction, the calibration start instruction being configured to instruct the magnetic field control system and the calibration box to begin performing a calibration operation.

5. The device of claim 4, wherein the calibration box is further configured to:

6. The apparatus of claim 1, further comprising a temperature control system for receiving a temperature field control command including a target operating temperature sent by the host computer and outputting a temperature field having the target operating temperature.

7. The apparatus of claim 6, wherein the torque sensor is further configured to output a second torque signal based on the target operating temperature;

8. The apparatus of claim 6, wherein the temperature control system comprises:

9. The apparatus of claim 7, wherein the host computer is further configured to output a temperature performance test start instruction, the temperature performance test start instruction being configured to instruct the temperature control system and the calibration box to start performing a temperature performance test.

10. The device of claim 1, wherein the calibration box is provided with a display screen, and the display screen is a human-machine interaction display screen.

11. Calibration method, characterized in that it is based on a calibration device according to any one of claims 1 to 10, comprising:

12. The method of claim 11, wherein receiving a magnetic field strength control command containing a target magnetic field strength and outputting a uniform magnetic field having the target magnetic field strength comprises:

13. The method of claim 11, wherein the target magnetic field strength comprises a first target magnetic field strength and a second target magnetic field strength:

14. The method of claim 13, further comprising;

15. The method of claim 11, wherein the method further comprises:

outputting a second torque signal according to the target working temperature;

16. The method of claim 15, wherein receiving a temperature field control command comprising a target operating temperature and outputting a temperature field having the target operating temperature comprises: