JP5074796B2 - Sensor correction information acquisition method and detection apparatus - Google Patents

Description

  The present invention relates to a sensor correction information acquisition method for acquiring correction information for correcting an output of a sensor such as a rotation sensor or a pressure sensor in response to a change in environmental temperature, and a detection apparatus using the correction information. About.

  Conventionally, various sensors such as a rotation sensor for detecting a rotation position and a pressure sensor for detecting pressure have been provided. These sensors have the property that their output characteristics change depending on their temperature. For this reason, temperature compensation is performed to correct the change in the output characteristics due to the temperature, thereby preventing the influence of the temperature change and performing stable output.

  As an example of such temperature compensation, the inductance of the coil is changed using a magnetic material having a shape in which the overlapping area with the coil gradually changes with the rotation of the detection object, and the rotation of the detection object is based on this change. A rotational position detector that detects an angle has been proposed (see Patent Document 1). This rotational position detector includes a thermistor having a negative temperature characteristic in the vicinity of the coil, and this thermistor reduces fluctuations in the output value due to temperature changes.

  In order to reduce the fluctuation of the output value of the temperature change using the thermistor in this way, the coil output characteristic corresponding to the current temperature is obtained from the memory, and the coil output value is corrected based on this output characteristic. Therefore, it is necessary to output the corrected value as an output value. For this reason, it is necessary to previously measure the output characteristics of the coil depending on the temperature and store them in the memory.

  On the other hand, as a method for measuring output characteristics depending on temperature in advance, a sensor and an inspection jig for the sensor are housed in a thermostatic chamber, and the output value of the sensor is acquired by the inspection jig with the temperature inside the thermostatic chamber set to a predetermined temperature. There is a way. This method raises or lowers the ambient temperature in the thermostatic chamber to the target temperature, and then maintains the ambient temperature until the inspection jig reaches the target temperature. It is such a thing.

  As a method for shortening this time, a temperature control method in a temperature characteristic inspection of a pressure sensor has been proposed (see Patent Document 2). In this temperature control method, the inspection jig can be set to a predetermined inspection temperature in a short time by circulating air having a temperature substantially equal to the atmospheric temperature in the thermostatic chamber in the inspection jig.

  However, even if the temperature of the inspection jig can be stabilized in a short time in this way, as shown in FIG. 8, it is unavoidable that a time t ′ for maintaining a constant temperature in the thermostatic bath is generated. Therefore, it took time to acquire temperature characteristics. And the shortening of the acquisition time of such temperature characteristics is obtained by measuring a large number of temperatures in a wide temperature range, such as automobile parts that require temperature compensation in the range from -40 ° C to + 125 ° C. It was highly desirable when it was necessary to do so.

JP 2001-296103 A Japanese Patent Laid-Open No. 9-178598

  In view of the above problems, an object of the present invention is to propose a sensor correction information acquisition method and a detection device that can acquire correction information for correcting the output of a sensor in a short time in accordance with the temperature characteristics of the sensor. To do.

According to the present invention, a workpiece having a correction target sensor is provided with a temperature sensor for detecting temperature, a sensor output acquisition step of acquiring a sensor output of the correction target sensor, and the temperature sensor at the time of output of the sensor output. A temperature output acquisition step of acquiring a temperature output; a reference output storage step of storing the sensor output of the correction target sensor at the start temperature in a memory as a reference output that the correction target sensor should originally output; and the sensor output; based on the said reference output, in association with temperature output, it has a correction information calculation step of calculating the correction information for correcting the sensor output, and at least the sensor output obtaining step said temperature output obtaining step, the workpiece the temperature from the start temperature at the start of processing by continuously changing within a predetermined range, until the process ends to return to the start temperature Between, in addition to at the start of processing and during processing is completed, and executes a plurality of times, with the reference output is a sensor output at the start of processing, by comparing the sensor output at the time of processing is finished, at the processing end and the reference output It is a sensor correction information acquisition method which has the determination process of determining whether sensor output corresponds .

The correction target sensor can be composed of an appropriate sensor such as a rotation sensor or a pressure sensor.
The predetermined range is a range from a low temperature side target temperature that is a preset low temperature side target temperature to a high temperature side target temperature that is a preset high temperature side target temperature, a range from normal temperature to a low temperature side target temperature, a high temperature side A range from the target temperature to room temperature or a plurality of these can be used.

  According to the present invention, correction information for correcting the output of the correction target sensor in accordance with the temperature can be acquired in a short time. In other words, since the temperature output and the sensor output are acquired continuously while changing the temperature, there is no need to stabilize at a constant temperature as in the past, and the time required to stabilize at this constant temperature is shortened. can do.

Further, based on the reference output storage step of storing the sensor output of the correction target sensor at the start temperature in the memory as a reference output that should be output by the correction target sensor, the temperature output based on the sensor output and the reference output The correction information calculation step of calculating correction information for correcting the sensor output in association with the sensor output , so that accurate correction information based on the sensor output of the correction target sensor and the temperature output of the temperature sensor provided on the workpiece Can be calculated.

In addition, at the start of the process and at the end of the process, the process is executed a plurality of times during the period from the start temperature at the start of the process to the end of the process by continuously changing within a predetermined range from the start temperature. A step of comparing the reference output, which is the sensor output at the start time, with the sensor output at the end of the process at the start temperature, and determining whether the reference output and the sensor output at the end of the process match; Thus, if they match in the determination, it can be confirmed that the sensor adjustment processing has been executed correctly.

  As an aspect of the present invention, the predetermined range can be a range from a low temperature side target temperature that is a preset low temperature side target temperature to a high temperature side target temperature that is a preset high temperature side target temperature.

The low temperature side target temperature can be configured at a temperature lower than the low temperature side operation compensation temperature, which is the low temperature side temperature at which the operation compensation of the correction target sensor is required.
The high temperature side target temperature can be configured to be higher than the high temperature side operation compensation temperature, which is the high temperature side temperature at which the operation compensation of the correction target sensor is required.

  According to the present invention, it is possible to calculate correction information for the entire temperature range for which operation compensation is required. Therefore, the operation compensation for the required temperature range can be reliably executed.

According to another aspect of the present invention, there is provided an input unit that receives an input of a correction information creation instruction, a correction target sensor that outputs a sensor to be corrected, a temperature sensor that outputs a temperature when the sensor output is output, and the correction information creation instruction. And the output acquisition means for acquiring the sensor output and the temperature output when the signal is input, and the sensor output of the correction target sensor at the start temperature is stored as a reference output that the correction target sensor should originally output. Storage means for storing correction information for correcting the sensor output in association with the temperature output based on the sensor output and the reference output, the reference output that is the sensor output at the start of the process, and at the end of the process comparing the sensor output and the reference output, a determination executing means or the sensor output matches at process end, the Wherein the positive information creation instruction is a detecting device and a correction execution means for applying the correction by the correction information to the sensor output by the correction target sensor when not input.

  The correction information can be calculated by correction information calculation means provided in the detection apparatus, or can be calculated by an external apparatus by outputting the sensor output and temperature output acquired by the output acquisition means to the outside. When the calculation is performed by an external device, the calculated correction information may be registered from the external device in a storage unit in the detection device.

  According to the present invention, correction information for correcting the output of the correction target sensor in accordance with the temperature can be acquired in a short time. In other words, since the temperature output and the sensor output are acquired continuously while changing the temperature, there is no need to stabilize at a constant temperature as in the past, and the time required to stabilize at this constant temperature is shortened. can do.

Further, the sensor output of the correction target sensor at the start temperature is stored as a reference output that the correction target sensor should originally output, and the sensor output is associated with the temperature output based on the sensor output and the reference output. By providing storage means for storing the correction information for correcting the output , the detection device can calculate and register the correction information by itself, and easily register the correction information individually calculated and customized by each detection device. it can.

In addition, a determination execution unit is provided that compares the reference output, which is a sensor output at the start of processing, with the sensor output at the end of processing, and determines whether the reference output matches the sensor output at the end of processing. Thus, if they match in the determination, it can be confirmed that the sensor adjustment processing has been executed correctly.

As an aspect of the present invention, the temperature sensor can be made of the same material as the correction target sensor.
According to the present invention, the temperature dependence of the output can be made substantially equal.

As an aspect of the present invention, the correction target sensor may be a rotation sensor in a rotation angle detection device attached to a steering shaft .
According to the present invention, the rotation angle can be detected from the sensor output of the rotation sensor.

  According to the present invention, correction information for correcting the output value of the sensor corresponding to the temperature characteristic of the sensor can be acquired in a short time.

  An embodiment of the present invention will be described below with reference to the drawings.

  1 shows a cross-sectional plan view of a rotation angle detection device 1 attached to a steering shaft S of an automobile, and FIG. 2 shows a cross-sectional view of the rotation angle detection device 1 taken along the line AA.

  The rotation angle detection device 1 includes a rotor 8 attached to the steering shaft S, a sensing unit 6 attached to the rotor 8 via two stays 5, four fixed cores 13, and these fixed cores 13. The four temperature sensors 17, the circuit board 23, and the case 2 (see FIG. 2) for storing them are configured.

Case 2 includes an upper case 3 and a lower case 4.
The sensing unit 6 is formed in a ring shape whose width continuously changes using a conductive metal such as aluminum, copper, silver, or brass.

  The fixed core 13 is fixed to the case 2 by the core holder 11, and the two fixed cores 13 are arranged opposite to each other above and below the sensing unit 6. This fixed core 13 has an excitation coil 14 and a core body 15 inside, and when an AC excitation current is passed through the excitation coils 14 of the two fixed cores 13 arranged opposite to each other, the excitation coil 14 is moved to the surroundings. An alternating magnetic field is formed, and the opposing core bodies 15 cooperate to form a magnetic circuit. Here, when the magnetic flux generated by the excitation coil 14 crosses the sensing unit 6, an eddy current is induced on the surface of the sensing unit 6, and the impedance of the excitation coil 14 in each fixed core 13 changes. The amount of impedance variation varies depending on the area of the sensing unit 6 corresponding to the fixed core 13. Thereby, the exciting coil 14 transmits a coil output signal whose output value changes due to a change in impedance to the rotation angle detection circuit 16 (see FIG. 1) of the circuit board 23.

  The rotation angle detection circuit 16 includes an oscillation unit, a phase shift unit, a phase shift amount detection unit, a conversion unit, and a signal processing unit. The rotation angle detection circuit 16 shifts the phase of the oscillation signal of a specific frequency input from the oscillation unit by the phase shift unit according to the magnitude of the eddy current of the sensing unit 6, and detects the phase shift amount. The signal is detected by the conversion unit, converted into a parameter by the conversion unit, the rotation angle is detected by the signal processing unit from the parameter, and the detected rotation angle is transmitted to the control unit 25. Thereby, the rotation angle detection circuit 16 can detect the rotation angle of the rotor 8 based on the coil output signal of the exciting coil 14.

  The temperature sensor 17 (see FIG. 2) is directly attached to the fixed core 13, detects the temperature of the fixed core 13, and transmits a temperature output signal to the control unit 25 of the circuit board 23. The temperature sensor 17 is preferably made of the same material as that of the exciting coil 14 that is a sensor to be corrected. As a result, the temperature dependence of the output can be made substantially equal.

  The circuit board 23 is mounted with a rotation angle detection circuit 16 that detects the rotation angle of the rotor 8 based on a coil output signal of the exciting coil 14 and a control unit 25 that performs various control operations and stores information. An excitation coil 14 is electrically connected to the rotation angle detection circuit 16. A rotation angle detection circuit 16 and a temperature sensor 17 are electrically connected to the control unit 25.

  The control unit 25 corrects the rotation angle signal output from the rotation angle detection circuit 16 in the memory 26 of the control unit 25 in accordance with a program stored in the memory 26 (see FIG. 3 described later). And the correction process which correct | amends based on the temperature output signal which the temperature sensor 17 outputs is also performed.

  When the control unit 25 receives a correction information generation instruction from the outside in accordance with a program stored in the memory 26, the control unit 25 acquires a rotation angle signal output from the rotation angle detection circuit 16 and a temperature output signal of the temperature sensor 17. Then, a correction information creating process is also executed in which the difference between the rotation angle signal and the reference signal to be output and the temperature output signal are associated with each other and stored in the memory 26 as correction information.

  Here, the reference signal may be a rotation angle signal output from the rotation angle detection circuit 16 based on a coil output signal output from the exciting coil 14 at room temperature. Note that a rotation angle signal that should be output in advance may be registered in the memory 26 of the control unit 25, and this rotation angle signal may be adopted as a reference signal.

  FIG. 3 shows a block diagram of a sensor adjustment system 30 that adjusts an output value by acquiring an output change due to a temperature change of the rotation angle detection device 1 in the thermostatic chamber 35.

  The sensor adjustment system 30 includes a thermostatic chamber 35, a controller 33, and a temperature adjustment device 31.

  The temperature adjustment device 31 continuously lowers and raises the atmospheric temperature in the thermostatic chamber 35 according to the temperature adjustment signal received from the controller 33, and maintains the atmospheric temperature at a constant temperature as necessary.

  The controller 33 controls the temperature adjustment device 31 according to a program stored therein to change the atmospheric temperature in the thermostatic chamber 35, and correction information is sent to each of the plurality of connected rotation angle detection devices 1. Correction information creation instruction processing for instructing creation of the data is executed.

  The rotation angle detection device 1 is connected to the controller 33 via the interface 24, receives a correction information creation instruction signal from the controller 33, and also receives power supply. In the rotation angle detection device 1, the control unit 25 executes the above-described correction information creation process in accordance with the correction information creation instruction signal.

  FIG. 4 is a flowchart of the correction information creation process executed by the control unit 25 of the rotation angle detection device 1.

  When the control unit 25 receives the correction information creation instruction signal from the controller 33 via the interface 24, the control unit 25 acquires the rotation angle signal from the rotation angle detection circuit 16 based on the coil output signal of the excitation coil 14, and the temperature sensor 17 An output signal is acquired (step S1). The rotation angle signal and the temperature output signal are acquired simultaneously or substantially simultaneously. The almost simultaneous means that the rotation angle signal is acquired and the temperature output signal is acquired in order without much time interval.

  The control unit 25 reads the reference signal stored in the memory 26 (step S2), and calculates a correction value based on the reference signal and the rotation angle signal (step S3). This correction value can be composed of a simple value that becomes the reference signal by adding or subtracting the rotation angle signal and the correction value, or a coefficient used in an appropriate calculation formula.

  The control unit 25 registers the calculated correction value in the memory 26 (step S4), and ends the correction information creation process.

  FIG. 5 shows a flowchart of sensor adjustment processing executed by the controller 33 of the sensor adjustment system 30.

  The controller 33 transmits a reference signal registration instruction signal to the rotation angle detection device 1 and registers the reference signal in the memory 26 (step S10). At this time, the control unit 25 of the rotation angle detection device 1 acquires a rotation angle signal from the rotation angle detection circuit 16 based on the coil output signal of the excitation coil 14, and uses the rotation angle signal as a reference signal at room temperature to store the memory 26. Register with.

  The controller 33 transmits a correction information creation instruction signal to the rotation angle detection device 1 to execute a correction information creation process (step S11). At this time, the ambient temperature of the thermostatic chamber 35 is normal temperature as shown in the timing chart of FIG. 6, and the correction information creation processing is executed at the normal temperature timing T1.

  The controller 33 transmits a temperature adjustment signal to the temperature adjustment device 31, and the low temperature side target whose ambient temperature in the thermostatic chamber 35 is slightly lower than the low temperature side operation compensation temperature (for example, −40 ° C.) of the rotation angle detection device 1. The temperature is lowered to a temperature (for example, an arbitrary temperature of −42 ° C. to −50 ° C.) (step S12).

  The controller 33 maintains the ambient temperature of the thermostatic chamber 35 at the low temperature side target temperature until the temperature of the rotation angle detection device 1 stabilizes at a temperature equal to or lower than the low temperature side operation compensation temperature (step S13: NO).

  If the temperature of the rotation angle detection device 1 is stabilized (step S13: YES), the controller 33 transmits a correction information generation instruction signal to the rotation angle detection device 1 to execute correction information generation processing (step S14). At this time, as shown in the timing chart of FIG. 6, the ambient temperature of the thermostatic chamber 35 is slightly lower than the low-temperature side operation compensation temperature, and the correction information is obtained at a timing T2 when the temperature of the rotation angle detection device 1 is stabilized at this temperature. Run the creation process.

  The controller 33 transmits a temperature adjustment signal to the temperature adjustment device 31, and continuously increases the ambient temperature so that the ambient temperature of the thermostatic chamber 35 increases along a constant temperature increase line (step S15).

  The controller 33 waits until a predetermined measurement time (for example, a fixed time such as an interval of 10 minutes) elapses (step S16: NO), and when the measurement time elapses (step S16: YES), the rotation angle detector 1 A correction information creation instruction signal is transmitted to the CPU to cause correction information creation processing to be executed (step S17). At this time, as shown in the timing chart of FIG. 6, the ambient temperature of the thermostatic chamber 35 continuously changes between the low temperature side target temperature and the high temperature side target temperature. Let it run. Here, the high temperature side target temperature is a temperature (for example, any temperature between 102 ° C. and 110 ° C.) slightly higher than the high temperature side operation compensation temperature (for example, 100 ° C.) of the rotation angle detection device 1.

  The controller 33 repeats steps S15 to S17 until the ambient temperature of the thermostatic chamber 35 reaches the high temperature target temperature (step S18: NO). If the high temperature side target temperature is reached (step S18: YES), the thermostatic chamber 35 is reached. Is maintained at the target temperature on the high temperature side (step S19).

  If the time necessary for the temperature of the rotation angle detection device 1 to stabilize at a temperature equal to or higher than the high temperature side operation compensation temperature has elapsed (step S20: YES), the controller 33 notifies the rotation angle detection device 1 of a correction information creation instruction signal. And the correction information creation process is executed (step S21). At this time, the atmospheric temperature of the thermostatic chamber 35 is a high temperature side target temperature as shown in the timing chart of FIG. 6 and is corrected at a timing T4 at which the temperature of the rotation angle detection device 1 is stable at a temperature equal to or higher than the high temperature side operation compensation temperature. Execute information creation processing.

  The controller 33 transmits a temperature adjustment signal to the temperature adjustment device 31, and lowers the ambient temperature of the thermostatic chamber 35 to room temperature (step S22).

  If the ambient temperature reaches room temperature, the controller 33 maintains the ambient temperature of the thermostatic chamber 35 at room temperature (step S23). When the temperature of the rotation angle detection device 1 is stabilized at room temperature (step S24: YES), the controller 33 transmits a correction information generation instruction signal to the rotation angle detection device 1 to execute correction information generation processing (step S25). The process ends. At this time, the ambient temperature of the thermostatic chamber 35 is normal temperature as shown in the timing chart of FIG. 6, and the correction information creation processing is executed at timing T5 when the temperature of the rotation angle detection device 1 is stabilized at this normal temperature.

  In this embodiment, the correction information is created and registered in steps S16 to S17 while the correction information is raised from the low temperature side target temperature to the high temperature side target temperature. Correction information is created and registered until it is lowered (between steps S12 and S13), or is created until it is lowered from the high-temperature target temperature to room temperature (between steps S22 and S23). The registration may be executed.

  Further, contrary to increasing from the low temperature side target temperature as the first temperature to the high temperature side target temperature as the second temperature, from the high temperature side target temperature as the first temperature to the low temperature side target temperature as the second temperature. It may be configured that the correction information is created and registered during this time. However, since it is easier to raise the temperature than to lower it, the correction information can be created and registered more efficiently if it is raised as in this embodiment.

  FIG. 7 shows a flowchart of the rotation angle output process executed by the control unit 25 of the rotation angle detection device 1 that has been subjected to the sensor adjustment process described above.

  The control unit 25 detects the rotation angle of the rotor 8 by the fixed core 13 and the rotation angle detection circuit 16 to acquire a rotation angle signal (step S31), detects the temperature of the fixed core 13 by the temperature sensor 17, and outputs the temperature. A signal is acquired (step S32).

  The control unit 25 acquires correction information from the memory 26 (step S33), and applies the correction value corresponding to the value of the temperature output signal acquired in step S32 to the value of the rotation angle signal acquired in step S31. The rotation angle is corrected (step S34).

  The control unit 25 outputs a corrected rotation angle, which is a corrected rotation angle, from an external output terminal (not shown) to the outside (step S35), and ends the process. The corrected rotation angle output to the outside is used by, for example, an automobile equipped with the rotation angle detection device 1.

  Correction information for correcting the rotation angle signal that is the output value of the rotation angle detection circuit 16 in accordance with the temperature characteristics of the excitation coil 14 and the rotation angle detection circuit 16 in the rotation angle detection device 1 by the configuration and operation described above. Can be acquired in a short time.

  In other words, the temperature can be continuously changed from the low temperature side target temperature to the high temperature side target temperature, and the time for maintaining the temperature until it stabilizes at a constant temperature other than the low temperature side target temperature and the high temperature side target temperature as in the past (for example, About 2 hours per temperature).

  The controller 33 simply transmits a correction information creation instruction signal to the plurality of rotation angle detection devices 1, and each rotation angle detection device 1 acquires its own rotation angle signal and temperature output signal to create correction information. Correction information individually corresponding to a plurality of rotation angle detection devices 1 can be created simultaneously. Therefore, highly accurate correction information can be created in a short time.

  Since the correction information is created based on the excitation coil 14, the rotation angle detection circuit 16, and the temperature sensor 17 mounted on the rotation angle detection device 1, there is no difference between the created correction information and the actually required correction. Highly accurate correction information can be created.

  Since the temperature sensor 17 is close to the fixed core 13, the difference between the actual temperature of the fixed core 13 and the temperature detected by the temperature sensor 17 can be almost eliminated, and highly accurate correction information can be created.

  Further, since the temperature output signal output from the same temperature sensor 17 is used in the correction information creation process and the rotation angle output process described above, it is possible to reliably apply a correct correction value to the rotation angle signal output in practical use. it can.

  The rotation angle detection device 1 is configured to receive an input of a correction information creation instruction from the external controller 33 through the interface 24. However, an appropriate input device such as a push button is provided on the circuit board 23, and the input device is connected to the input device. The input may be a correction information creation instruction.

  Further, the information acquired at the timing T1 and the information acquired at the timing T5 may be compared to determine whether or not both pieces of information match. In this case, if they match in the determination, it can be confirmed that the sensor adjustment processing has been executed correctly.

  The correction information is configured as information for correcting the rotation angle signal output from the rotation angle detection circuit 16, but is configured as information for correcting the coil output signal output from the excitation coil 14, and the corrected coil output signal is expressed as A configuration may be adopted in which the rotation angle detection circuit 16 is input.

  Further, the temperature sensor 17 may not be directly attached to the fixed core 13 but may be provided at a position near the fixed core 13 on the circuit board 23. Also in this case, the temperature near the exciting coil 14 can be detected, and an error from the actual temperature of the exciting coil 14 in the fixed core 13 can be eliminated as much as possible.

  In the first embodiment described above, the control unit 25 of the rotation angle detection device 1 is configured to execute all the correction information creation processing. However, as shown in the flowchart of FIG. 8, the correction information calculation processing is executed by the controller 33. It is good also as a structure.

  In this case, the controller 33 configured by a PC (personal computer) or the like first transmits a signal acquisition instruction signal instructing acquisition of the rotation angle signal and the temperature output signal from the interface 24 to the control unit 25 (step S41).

  When receiving the signal acquisition instruction signal, the control unit 25 acquires the rotation angle signal from the rotation angle detection circuit 16 based on the coil output signal of the excitation coil 14, and acquires the temperature output signal from the temperature sensor 17 (step S42). . And the control part 25 transmits the acquired rotation angle signal and temperature output signal to the controller 33 (step S43).

  The controller 33 reads the reference signal of the rotation angle detection device 1 stored in the storage unit provided in itself (or the storage unit of the memory 26 or other device such as a server connected via a communication line) (step) In step S44, a correction value is calculated based on the reference signal and the rotation angle signal (step S45).

Then, the controller 33 transmits a correction value registration instruction signal for instructing to register the calculated correction value as a correction value corresponding to the temperature output signal to the control unit 25 (step S46).
The control unit 25 registers the received correction value in the memory 26 (step S47), and ends the correction information creation process.

  Since other configurations and operations are the same as those in the first embodiment, detailed description thereof is omitted.

Through the above processing, even when the memory 26 of the rotation angle detection device 1 has a small capacity, the controller 33 can calculate the correction value and register the calculated correction value in the memory 26.
In the second embodiment, the correction value is calculated and registered in the memory 26 at each measurement timing (steps S11, S14, S17, S21, and S25) described with reference to FIG. The registration may be performed collectively at the end. Even in this case, the correction value can be registered in the memory 26.

In correspondence between the configuration of the present invention and the above-described embodiment,
The workpiece and the detection device of the present invention correspond to the rotation angle detection device 1 of the embodiment,
Similarly,
The sensor to be corrected corresponds to the excitation coil 14,
The output acquisition means corresponds to the control unit 25 that executes step S1,
The input means corresponds to the interface 24,
The correction information calculation means corresponds to the control unit 25 that executes step S3,
The correction execution means corresponds to the control unit 25 that executes steps S31 to S35,
The storage means corresponds to the memory 26,
The sensor output acquisition step and the temperature output acquisition step correspond to step S1,
The correction information calculation step corresponds to step S3,
The sensor output corresponds to the rotation angle signal,
The temperature output corresponds to the temperature output signal,
The reference output corresponds to the reference signal,
The predetermined range corresponds from the low temperature side target temperature to the high temperature side target temperature,
The correction information creation instruction corresponds to the correction information creation instruction signal,
The present invention is not limited only to the configuration of the above-described embodiment, and many embodiments can be obtained.

The cross-sectional top view of the rotation angle detection apparatus attached to the steering shaft. AA arrow sectional drawing of a rotation angle detection apparatus. The block diagram of a sensor adjustment system. The flowchart of a correction information creation process. The flowchart of a sensor adjustment process. Timing chart of temperature change and correction information acquisition. The flowchart of a rotation angle output process. A conventional temperature change and correction information acquisition timing chart. 10 is a flowchart of correction information creation processing according to the second embodiment.

DESCRIPTION OF SYMBOLS 1 ... Rotation angle detection apparatus 14 ... Excitation coil 16 ... Rotation angle detection circuit 17 ... Temperature sensor 24 ... Interface 25 ... Control part 26 ... Memory

Claims (5)

A temperature sensor that detects the temperature of the workpiece having the sensor to be corrected is provided,
A sensor output acquisition step of acquiring a sensor output of the correction target sensor;
A temperature output acquisition step of acquiring the temperature output of the temperature sensor at the time of output of the sensor output ;
A reference output storage step of storing the sensor output of the correction target sensor at the start temperature in a memory as a reference output that the correction target sensor should output;
Based on said reference output and the sensor output, in association with temperature output, have a correction information calculation step of calculating the correction information for correcting the sensor output,
At least the sensor output acquisition step and the temperature output acquisition step are performed by continuously changing the temperature of the workpiece within a predetermined range from the start temperature at the start of processing until returning to the start temperature . In addition to executing at the start and end of processing, it is executed multiple times ,
A step of comparing the reference output, which is a sensor output at the start of processing, with a sensor output at the end of processing, and determining whether the reference output and the sensor output at the end of processing match; Information acquisition method. The sensor correction information acquisition method according to claim 1, wherein the predetermined range is a range from a low temperature side target temperature that is a preset low temperature side target temperature to a preset high temperature side target temperature that is a high temperature side target temperature. . An input means for receiving an input of a correction information creation instruction;
A correction target sensor that outputs a sensor to be corrected; and
A temperature sensor that outputs a temperature when the sensor output is output;
Output acquisition means for acquiring the sensor output and the temperature output when the correction information creation instruction is input;
The sensor output of the correction target sensor at the starting temperature is stored as a reference output that the correction target sensor should originally output, and the sensor output is related to the temperature output based on the sensor output and the reference output. Storage means for storing correction information to be corrected ;
The reference execution that is the sensor output at the start of the process is compared with the sensor output at the end of the process that has reached the start temperature, and the determination execution that determines whether the reference output matches the sensor output at the end of the process Means,
And a correction execution unit that corrects the sensor output from the correction target sensor using the correction information when the correction information generation instruction is not input. The detection device according to claim 3 , wherein the temperature sensor is made of the same material as the correction target sensor . The detection device according to claim 4 , wherein the correction target sensor is a rotation sensor in a rotation angle detection device attached to a steering shaft .

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