JP7312128B2 - Spoke angle measuring device and deviation determination method for spoke angle measuring device - Google Patents

Description

The present invention relates to a spoke angle measuring device for measuring spoke angles of a steering wheel of a vehicle, and a deviation determination method for the spoke angle measuring device.

Conventionally, methods are known for testing spoke angle deviation, which is the angle of the steering wheel of a vehicle. In a known method, a test device is attached to the steering wheel of the vehicle and the angle of the steering wheel is measured while the vehicle is running. For example, the method described in Patent Document 1 attaches a digital level to the steering wheel, and calculates the angular deviation amount of the steering wheel based on the measurement result of the digital level while the vehicle is traveling straight.

Japanese Patent No. 5836246

The apparatus used in the above-described tests often includes multiple components including fixtures and sensors that are fixed to the steering wheel. If looseness or distortion occurs in joints or connecting portions of these members, it becomes a factor that lowers the detection accuracy.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a spoke angle measuring device capable of measuring the angular deviation of a steering wheel of a vehicle with high accuracy, and a method of determining the deviation of the spoke angle measuring device. With the goal.

A mode for solving the above-mentioned problems includes an attachment jig detachably attached to a rim portion of a steering wheel, and a measuring instrument main body attached to the steering wheel via the attachment jig, wherein the attachment jig is , a rod-shaped central portion, and mounting portions positioned at both ends of the central portion and attached to the rim portion, the measuring instrument main body including an acceleration sensor and a gyro sensor, the measuring instrument main body is attached to the central portion so that the jig reference axis defining the horizontal direction of the central portion and the measuring device reference axis defining the horizontal direction of the measuring device main body are parallel, and the jig reference A deviation determination means for determining a deviation between the jig reference axis and the measuring instrument reference axis based on the detection value of the acceleration sensor when the axis is parallel to the horizontal plane and a preset reference value. A spoke angle measuring device characterized by:

According to this configuration, in the measuring device for measuring the spoke angle deviation of the steering wheel, it is possible to determine the deviation of the position and angle of the measuring device main body with respect to the mounting jig. Therefore, the spoke angle deviation of the steering wheel can be measured with high accuracy.

In the above configuration, the acceleration sensor defines an acceleration along a first axis that coincides with the reference axis of the measuring instrument, and defines a horizontal direction of the measuring instrument main body along with the first axis that is perpendicular to the reference axis of the measuring instrument. Acceleration of a second axis and acceleration of a third axis perpendicular to the horizontal direction of the measuring instrument main body are detected, and the deviation determination means detects the first axis and the third axis detected by the acceleration sensor. The deviation between the jig reference axis and the measuring instrument reference axis may be determined based on the detected acceleration value.
According to this configuration, by using the detection values of the acceleration sensor in a plurality of axes, it is possible to determine the deviation of the position and angle of the measuring device main body with respect to the mounting jig with higher accuracy. As a result, the spoke angle deviation of the steering wheel can be measured with higher accuracy.

In the above configuration, the deviation determination means calculates the deviation amount of the second axis based on the detected values of the accelerations of the first axis and the third axis detected by the acceleration sensor, and calculates the deviation amount. is greater than the reference value, it may be determined that there is a deviation between the jig reference axis and the measuring instrument reference axis.
According to this configuration, it is possible to obtain with high accuracy the amount of deviation of the angle of the measuring instrument main body with respect to the central portion of the mounting jig based on the angle of the plane formed by the first axis and the third axis. This makes it possible to more accurately determine the angular deviation of the measuring instrument body.

In the above configuration, the deviation determination means determines that the deviation amount of the second axis is larger than the reference value and does not exceed a preset upper limit value, the jig reference axis and the measuring instrument reference. The configuration may be such that the deviation from the axis is calibrated.
According to this configuration, the spoke angle deviation of the steering wheel can be measured with higher accuracy by calibrating the deviation of the position and angle of the measuring instrument main body with respect to the mounting jig.

In the above configuration, the deviation determining means may determine the deviation between the jig reference axis and the measuring device reference axis without using the detection value of the gyro sensor.
According to this configuration, it is possible to determine the displacement of the position and angle of the main body of the measuring device using the detection value of the acceleration sensor. Therefore, when measuring the spoke angle deviation using a gyro sensor, it is possible to effectively improve the measurement accuracy by using a plurality of sensors.

In the above configuration, an operation unit and gyro sensor inspection means for determining the state of the gyro sensor based on the detection value of the gyro sensor are provided, and the deviation determination unit determines the state of the gyro sensor according to the operation of the operation unit. and determination of the state of the gyro sensor by the gyro sensor inspection means.
According to this configuration, by executing the inspection mode, it is possible to determine the deviation of the position and angle of the measuring device main body with respect to the mounting jig, and inspect the gyro sensor.

Another aspect of solving the above problem is a spoke angle measuring device including a mounting jig that is detachably mounted on a rim portion of a steering wheel, and a measuring device main body that is mounted on the steering wheel via the mounting jig. In a measuring apparatus, a determination method for determining a deviation between the mounting jig and the measuring instrument main body, the measuring instrument main body having a jig reference axis defining a horizontal direction of the mounting jig and the measuring instrument It is mounted on the mounting jig in a direction parallel to the measuring instrument reference axis that defines the horizontal direction of the main body, and the jig reference axis is parallel to the horizontal plane, and the detection value of the acceleration sensor provided in the measuring instrument main body and a preset reference value.

According to this configuration, in the measuring device for measuring the spoke angle deviation of the steering wheel, it is possible to determine the deviation of the position and angle of the measuring device main body with respect to the mounting jig. Therefore, the spoke angle deviation of the steering wheel can be measured with high accuracy.

According to the present invention, in a measuring device for measuring the spoke angles of a steering wheel, it is possible to determine the deviation of the position and angle of the measuring instrument main body with respect to the mounting jig, and measure the spoke angle deviation of the steering wheel with high accuracy.

1 is a perspective view of a spoke angle measuring device according to an embodiment of the present invention; FIG. 2 is a block diagram showing the functional configuration of the spoke angle measuring device; FIG. 4 is a flow chart showing a procedure for inspecting the spoke angle measuring device; 4 is a flow chart showing a procedure for inspecting the spoke angle measuring device;

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing the configuration of a spoke angle measuring device 1. FIG.
A spoke angle measuring device 1 is a device for measuring a deviation of a mounting angle of a steering wheel of a vehicle, that is, a so-called spoke angle deviation. A vehicle whose spoke angle deviation is to be measured using the spoke angle measuring device 1 is called a target vehicle. In FIG. 1, the steering wheel 5 of the subject vehicle is shown in phantom lines.

The spoke angle measuring device 1 has a measuring device 2 containing a G sensor unit 205 and a gyro sensor unit 206 (to be described later) and a mounting jig 3 for fixing the measuring device 2 to the steering wheel 5 .

The measuring device 2 has a substantially box-shaped measuring device main body 21 . A start button 22 and a cancel button 23 that are operated by the operator are provided on the measuring instrument main body 21 . A display panel 24 for displaying various information and an indicator 25 are provided in the measuring instrument main body 21 . The display panel 24 is composed of, for example, a liquid crystal display panel, and displays characters and symbols under the control of the control unit 201, which will be described later. The indicator 25 has a light source such as an LED (light emitting diode), and turns on, off, or blinks the light source under the control of the control unit 201 .

The mounting jig 3 has a bar-shaped central portion 31 and a pair of mounting portions 35 arranged at both ends of the central portion 31 , and the measuring device main body 21 is fixed to the central portion 31 .
The mounting portion 35 includes a disk-shaped flange portion 36 fixed to the central portion 31 and a holding portion 37 arranged to face the flange portion 36 . 6 is sandwiched and grasped. The mounting portion 35 may include, for example, a moving mechanism that moves the pressing portion 37 toward the flange portion 36, a fixing portion that fixes the pressing portion 37, and the like. The spoke angle measuring device 1 is fixed to the steering wheel 5 by gripping the rim portion 6 with the pair of mounting portions 35 . The state in which the spoke angle measuring device 1 is attached to the steering wheel 5 via the mounting portion 35 is hereinafter referred to as the attached state of the spoke angle measuring device 1 .

FIG. 2 is a block diagram showing the functional configuration of the spoke angle measuring device 1. As shown in FIG.
The spoke angle measuring device 1 has a controller 201 and a memory 210 connected to the controller 201 . The control unit 201 includes a processor such as a CPU (Central Processing Unit) and a microcomputer, and the memory 210 stores programs executed by the processor of the control unit 201 and data processed by the processor. The control section 201 controls each section of the spoke angle measuring device 1 by executing a program stored in the memory 210 . The control unit 201 may be configured with a single processor, or may be configured with a plurality of processors. Also, the spoke angle measuring device 1 may include an SoC (System on Chip) that integrates the control unit 201, the memory 210, and the like. The control unit 201 corresponds to an example of deviation determination means and gyro sensor inspection means.

The measuring device 2 includes a display section 202 , an operation section 203 , an interface 204 , a G sensor unit 205 and a gyro sensor unit 206 , each of which is connected to the control section 201 .

The display unit 202 controls display of characters and symbols by the display panel 24 and lighting, blinking, and extinguishing of the indicator 25 under the control of the control unit 201 . The operation unit 203 detects operations on the start button 22 and the cancel button 23 and outputs signals indicating the detected operations to the control unit 201 .

The interface 204 includes a connector for connecting an external device different from the spoke angle measuring apparatus 1, and an interface circuit for communicating with the external device via the connector. The interface 204 includes, for example, a connector and an interface circuit conforming to the USB (Universal Serial Bus) standard, and can connect a USB memory device or the like. When a device is connected to the connector, the interface 204 identifies the device and outputs data indicating the identification result to the control unit 201 . The interface 204 performs processing such as writing data to the device and acquiring data from the device under the control of the control unit 201 .

The G sensor unit 205 is a sensor that detects acceleration, and is a sensor unit that integrates three-axis acceleration sensors in this embodiment. The gyro sensor unit 206 includes a gyro sensor that detects an angular velocity around a preset axis, and in this embodiment, is a unit integrating three-axis gyro sensors.

The detection axes of the G sensor unit 205 and the gyro sensor unit 206 are shown in FIG. 1 as the _XD axis, _YD axis, and _ZD axis. The _XD axis, the _YD axis, and the _ZD axis are orthogonal to each other, and the _XD axis is perpendicular to the surface of the measuring device body 21 on which the display panel 24 is arranged. The XD _- axis and the YD _- axis constitute a horizontal plane that serves as a reference for the posture of the measuring instrument main body 21 . The _ZD axis is perpendicular to the horizontal plane of the measuring instrument body 21 . The _YD axis corresponds to one example of a meter reference axis. The _XD axis corresponds to an example of the second axis of the G sensor unit 205, the _YD axis corresponds to an example of the first axis, and the _ZD axis corresponds to an example of the third axis.

The G sensor unit 205 detects the acceleration in the XD _- axis direction, the _YD- axis direction, and the _ZD- axis direction acceleration under the control of the control unit 201, and outputs the detection value of the acceleration of each axis to the control unit 201. output to
The gyro sensor unit 206 detects the angular velocity around the _XD axis, the angular velocity around the _YD axis, and the angular velocity around the _ZD axis under the control of the control unit 201, and outputs the detected value of the angular velocity of each axis to the control unit 201. output to

The memory 210 is configured by a semiconductor memory device or the like, and stores programs and data in a nonvolatile manner. The memory 210 stores reference value data 211 and calibration value data 212, for example. The reference value data 211 is data indicating a reference value and a calibration upper limit that are referred to in processing of the control unit 201 to be described later, and is stored in the memory 210 in advance. The calibration value data 212 is data indicating a calibration value for calibrating the detection value of the measuring device 2, and is created in a calibration mode to be described later.

When the spoke angle deviation of the steering wheel 5 is detected using the spoke angle measuring device 1, the target vehicle may be in a state in which it is traveling straight, or in a state in which the steered wheels of the target vehicle are in the same position as in straight traveling. be done. This state is called a straight-ahead state. The target vehicle travels on the test track or is placed on the test platform, so that it goes straight.

By fixing the mounting portion 35 to the steering wheel 5 , the spoke angle measuring device 1 is mounted at a specific position on the steering wheel 5 . For example, the mounting portion 35 has a shape that can be fixed to the rim portion 6 at a position where it contacts the spokes of the steering wheel 5 . Therefore, when there is no deviation of the spoke angles of the steering wheel 5, _{the YD} axis of the spoke angle measuring device 1 attached to the steering wheel 5 is horizontal in the straight running state.
Therefore, the deviation of the spoke angles can be detected by actually measuring the spoke angles while the target vehicle is in a straight-ahead state.

In the spoke angle measuring device 1, if looseness or distortion occurs in the connection between the measuring instrument 2 and the mounting jig 3, the measurement results of the spoke angles are affected. Therefore, the spoke angle measuring device 1 of the present embodiment has a function of determining whether or not the relative position and angle of the measuring instrument 2 with respect to the mounting jig 3 are appropriate. This determination is performed, for example, in the start-of-work inspection of the workplace where the spoke angle measuring device 1 is used, or in the periodic inspection regarding the performance of the spoke angle measuring device 1 .

Specifically, the control unit 201 can execute an inspection mode and a calibration mode.
The inspection mode is an operation mode for inspecting the spoke angle measuring device 1 and includes operations for determining the position and angle of the measuring instrument 2 with respect to the mounting jig 3 . The inspection mode also includes operations for inspecting the gyro sensor unit 206 .
Calibration mode is an operational mode that can be performed in inspection mode. In the calibration mode, the detected value of the measuring device 2 is calibrated according to the position and angle of the measuring device 2 with respect to the mounting jig 3 .

YJ _- axis, XJ _- axis and ZJ _- axis are set as indicators of the direction of the mounting jig 3 . The XJ _- axis, YJ _- axis, and ZJ _- axis are perpendicular to each other, and the YJ _- axis is the virtual central axis of the central portion 31 of the mounting jig 3, and corresponds to an example of the jig reference axis. The _XJ axis and the _YJ axis constitute the horizontal plane of the mounting jig 3 when the spoke angle measuring device 1 is mounted. This X _J axis-Y _J axis plane is parallel to the plane of the flange portion 36 . When the measuring instrument 2 and the mounting jig 3 are properly connected, the _XD axis and the _XJ axis are parallel, the _YD axis and the _YJ axis are parallel, and the _ZD axis and the _ZJ axis are parallel. are parallel.

3 and 4 are flow charts showing the inspection procedure of the spoke angle measuring device 1. FIG.
In the following description, in order to explain the installation angle of the spoke angle measuring device 1, the X axis, Y axis, and Z axis in the inspection space where the spoke angle measuring device 1 is inspected are assumed. The X-axis, Y-axis, and Z-axis form an orthogonal coordinate system perpendicular to each other, the Z-axis indicates the upward vertical direction of the examination space, and the X-axis and the Y-axis form a horizontal plane.

When the operator operates the start button 22, the control unit 201 starts the inspection mode and waits for the operator's operation (step S11). In step S<b>11 , the control unit 201 displays, for example, a notification to the operator on the display panel 24 that the inspection mode has started.
After confirming that the measuring device 2 is in the standby state by looking at the display panel 24, the operator sets the spoke angle measuring device 1 on the pedestal for inspection (step S12). The pedestal for inspection is a pedestal adjusted for inspecting the spoke angle measuring device 1, and the spoke angle measuring device 1 can be fixed in a specific orientation. In step S12, the spoke angle measuring device 1 is set on a base for inspection so that the display panel 24 of the measuring instrument 2 faces upward in the vertical direction. Here, in the spoke angle measuring device 1, the _XJ axis is parallel to the Z axis, that is, vertically upward, and the plane formed by the _YJ axis and the _ZJ axis is horizontal.

After setting the spoke angle measuring device 1 on the inspection base, the operator operates the start button 22 (step S13). In response to the operation of the start button 22, the control unit 201 starts checking the deviation around the X axis (step S14). The control unit 201 acquires the detection value of _{the YD} axis and the detection value of the _ZD axis of the G sensor unit 205 in the preset measurement time (step S15). The control unit 201 calculates the amount of deviation from the acquired detection value of the _YD- axis acceleration and the acquired detection value of the _ZD- axis acceleration (step S15). That is, the control unit 201 calculates the deviation amount _{θX_CALI} about the X-axis by the following formula (1), with GY_ZG as the detected value of the _YD -axis acceleration and GZ_ZG as the detected value of the _ZD- axis acceleration.

The displacement amount _{θX_CALI} around the X axis corresponds to the angle of the YD-axis- _ZD -axis plane with respect to the horizontal plane, that is, the X-axis- _Y- axis plane. showing. Further, the deviation amount _{θX_CALI} can be said to be the inclination of the _XD axis with respect to the X axis when the spoke angle measuring device 1 is installed as shown in FIG. That is, the deviation amount _{θX_CALI} around the X axis is the deviation amount of the position of the measuring device 2 in the direction around the _ZD axis when the spoke angle measuring device 1 is attached to the steering wheel 5 as shown in FIG. It is an index expressed in .

The control unit 201 compares the amount of deviation calculated in step S16 with the reference value indicated by the reference value data 211 stored in advance in the memory 210, and determines whether or not the amount of deviation is equal to or less than the reference value (step S17). ). The reference value indicated by the reference value data 211 is a value indicating the allowable range of the deviation amount _{θX_CALI} around the X axis.
If the deviation amount is equal to or less than the reference value (step S17; YES), the control unit 201 terminates the deviation inspection around the X axis (step S18). In step S18, for example, the display panel 24 may notify that the check for deviation about the X-axis has been completed.

If the deviation amount is larger than the reference value (step S17; NO), the control section 201 starts the calibration mode (step S41). In the calibration mode, the _YD- axis detection value and the ZD _- axis detection value of the G sensor unit 205 at a preset measurement time are obtained (step S42). The control unit 201 calculates the deviation amount _{θX_CALI} about the X-axis from the acquired YD _- axis acceleration detection value and _ZD- axis acceleration detection value, for example, by the above equation (1) (step S43). The control unit 201 compares the calculated deviation amount _{θX_CALI} about the X-axis with the calibration upper limit indicated by the reference value data 211, and determines whether or not the deviation amount is equal to or less than the calibration upper limit (step S44).

Here, if the deviation amount is equal to or less than the calibration upper limit (step S44; YES), the control unit 201 calculates the calibration value of the detection value of the measuring device 2 and stores it in the memory 210 as the calibration value data 212 (step S45). ). A calibration value is a value for correcting the detection value of the measuring device 2 .

The following formula (2) is a formula for correcting the detection value _GZ of the acceleration in the _ZD- axis direction of the G sensor unit 205 . The following formula (3) is a formula for correcting the detected value of acceleration in the Y _-D axis direction of the G sensor unit 205 . _GY is a detection value in the _YD axis direction output by the G sensor unit 205 and _GZ is a detection value in the _ZD axis direction output by the G sensor unit 205 . _G'Y is the corrected YD _- axis acceleration, and _G'Z is the corrected ZD _- axis acceleration. _{θX_CALI} is the amount of deviation calculated by the above equation (1).

The calibration values indicated by the calibration value data 212 may be, for example, Cos θ _{X_CALI} and Sin θ _{X_CALI} , which are the parameters of the above equations (2) and (3), or G It may be an arithmetic expression or a program for obtaining ' _Y and _G'Z .

After calculating the calibration value in step S45, the control unit 201 terminates the calibration mode (step S46) and proceeds to step S19. In step S46, for example, the display panel 24 may notify that the calibration mode has ended.

On the other hand, if the amount of deviation exceeds the calibration upper limit (step S44; NO), the spoke angle measuring device 1 determines that the relative position or angle between the measuring instrument 2 and the mounting jig 3 exceeds the range that can be handled by calibration. It can be said that it is out of alignment. Therefore, it is necessary for the operator to check the mounting state of the measuring instrument 2 and the mounting jig 3 . In this case, the control unit 201 notifies the display panel 24 that calibration is not possible (step S47), and shifts to a standby state (step S48). As a result, the control unit 201 waits for the operator to turn off the spoke angle measuring device 1 or to operate the cancel button 23 to stop the inspection mode.

In step S19, the operator sets the spoke angle measuring device 1 again on the pedestal for inspection (step S19). In step S19, the spoke angle measuring device 1 is set on the inspection base so that the XJ _- axis, YJ _- axis, and ZJ _- axis are parallel to the X-axis, Y-axis, and Z-axis, respectively. In this state, the plane formed by the _XD axis and the _YD axis is horizontal.
The operator operates the start button 22 after setting the spoke angle measuring device 1 .

The control unit 201 starts checking the steering angle in response to the operation of the start button 22 (step S20). The control unit 201 acquires the detection value of the _XD axis and the detection value of the _YD axis of the G sensor unit 205 in a preset measurement time (step S21). The control unit 201 calculates the difference between the _XD -axis- _YD- axis plane and the horizontal plane from the acquired _XD- axis acceleration detection value and _YD- axis acceleration detection value (step S22). The difference calculated in step S22 corresponds to the deviation amount of the measured value when the spoke angle measuring device 1 measures the steering angle. In step S<b>22 , the control unit 201 displays the calculated difference on the display panel 24 . Thereafter, when the operator confirms the display on the display panel 24 and operates the start button 22, the control section 201 ends the steering angle inspection (step S23).

Subsequently, the control unit 201 starts gyro sensor inspection (step S24), and notifies through the display panel 24 that the gyro sensor inspection is to be performed.
When the operator operates the start button 22 to instruct the start of inspection (step S25), the control section 201 starts acquiring the detection value of the gyro sensor unit 206 (step S26). After operating the start button 22 in step S25, the operator rotates the inspection base on which the spoke angle measuring device 1 is set by 180° around the Z axis (step S27). The control unit 201 acquires the detection value of the gyro sensor unit 206 while the spoke angle measuring device 1 rotates together with the inspection base.

The control unit 201 calculates the difference between the amount of rotation of the spoke angle measuring device 1 obtained from the detection value of the gyro sensor unit 206 and the amount of rotation of the test base, and displays it on the display panel 24 (step S28). The difference calculated in step S28 corresponds to the error in the measurement using the gyro sensor unit 206. FIG. Thereafter, when the operator confirms the display on the display panel 24 and operates the start button 22, the control section 201 terminates the gyro sensor inspection (step S29). Furthermore, when the operator operates the start button 22, the control section 201 terminates the inspection mode (step S30).

As described above, the spoke angle measuring device 1 of the embodiment to which the present invention is applied includes the attachment jig 3 detachably attached to the rim portion 6 of the steering wheel 5 , and the steering wheel 5 via the attachment jig 3 . The mounting jig 3 has a rod-shaped central portion 31 and mounting portions 35 positioned at both ends of the central portion 31 and attached to the rim portion 6 to measure The measuring instrument main body 21 includes a G sensor unit 205 and a gyro sensor unit 206. The measuring instrument main body 21 has a _YJ axis as a jig reference axis that defines the horizontal direction of the central portion 31, and the measuring instrument main body 21. The detection value of the G sensor unit 205, which is attached to the central part 31 so as to be parallel to the _YD axis as the measuring instrument reference axis that defines the horizontal direction, and the _YJ axis is parallel to the horizontal plane, and the preset A control unit 201 is provided to determine the deviation between the _YJ axis and the _YD axis based on the reference value.

According to the spoke angle measuring device 1 and the determination method executed by the spoke angle measuring device 1, the deviation of the position and angle of the measuring instrument main body 21 with respect to the mounting jig 3 of the spoke angle measuring device 1 can be determined. Therefore, the spoke angles of the steering wheel 5 can be measured after confirming the accuracy of the spoke angle measuring device 1, and the spoke angle deviation can be measured with high accuracy.

The G sensor unit 205 has an acceleration of the _YD axis (first axis) that coincides with the _YD axis, and an _XD axis that is perpendicular to the _YD axis and defines the horizontal direction of the measuring instrument main body 21 together with _{the YD} axis. (second axis) acceleration and _ZD- axis (third axis) acceleration perpendicular to the horizontal direction of the measuring instrument main body 21 are detected _. A deviation between the _YJ axis and the _YD axis is determined based on the detected values of acceleration on the axis and the _ZD axis.
According to this configuration, by using the detection values of the G sensor unit 205 in the _YD axis and the _ZD axis, it is possible to determine the deviation of the position and angle of the measuring instrument main body 21 with respect to the mounting jig 3 with higher accuracy. . Thereby, the spoke angle deviation of the steering wheel 5 can be measured with higher accuracy.

The control unit 201 calculates the amount of deviation around the _XD axis based on the detected values of the _YD -axis and _ZD- axis acceleration detected by the G sensor unit 205 , and the calculated amount of deviation is used as the reference value data 211 . If it is larger than the indicated reference value, it is determined that there is a deviation between the _YJ axis and the _YD axis.
According to this configuration, the amount of deviation of the angle of the measuring instrument main body 21 with respect to the mounting jig 3 can be obtained with high accuracy based on the angle of the plane formed by the _YD axis and the _ZD axis. Thereby, the deviation of the angle of the measuring device main body 21 can be determined more accurately.

The control unit 201 calibrates the deviation between the _YJ axis and the _YD axis when the deviation amount is larger than the reference value and does not exceed the preset upper limit value.
According to this configuration, by calibrating the position and angle deviation of the measuring device body 21 with respect to the mounting jig 3, the spoke angle deviation of the steering wheel 5 can be measured with higher accuracy.

The control unit 201 determines the deviation between the _YJ axis and the _YD axis without using the detection value of the gyro sensor unit 206 .
According to this configuration, the detection value of the G sensor unit 205 can be used to determine the deviation of the position and angle of the measuring device main body 21 . Therefore, when measuring the spoke angles of the target vehicle using the gyro sensor unit 206, it is possible to effectively improve the measurement accuracy by using a plurality of sensors.

The spoke angle measuring device 1 includes an operation unit 203 , and the control unit 201 functions as gyro sensor inspection means for determining the state of the gyro sensor unit 206 based on the detection value of the gyro sensor unit 206 . Spoke angle measuring device 1 executes an inspection mode including determination by control unit 201 and determination of the state of gyro sensor unit 206 by control unit 201 in response to operation of operation unit 203 .
According to this configuration, the gyro sensor unit 206 can be inspected by determining the position and angle deviation of the measuring instrument body 21 with respect to the mounting jig 3 by executing the inspection mode.

The above-described embodiment is merely an example, and it goes without saying that modifications can be made as appropriate without departing from the gist of the present invention.
In the above-described embodiment, the controller 201 exemplifies the configuration for determining deviation based on the reference value indicated by the reference value data 211 stored in the memory 210, but the present invention is not limited to this. For example, the control unit 201 may acquire data from a USB memory device connected to the interface 204 and make the determination in step S17 based on the reference value indicated by the acquired data. In this case, the control unit 201 may cause the USB memory device connected to the interface 204 to store the calibration value calculated in step S45.

Further, in the above-described embodiment, the control unit 201 mounted on the measuring instrument 2 exemplifies a configuration in which it functions as deviation determination means and gyro sensor inspection means, but a device connected to the measuring instrument 2 by wire or wirelessly , deviation determination means, and gyro sensor inspection means, and may perform the processing shown in FIGS.
Further, for example, in the above-described embodiment, the gyro sensor unit 206 detects angular velocities in three axes of the _XD axis, _{the YD axis} , and the ZD axis. gyro sensor.
Moreover, the specific aspect of the operation unit 203 is not limited to the start button 22 and the cancel button 23, and can be appropriately changed in consideration of operability and the like.

REFERENCE SIGNS LIST 1 spoke angle measuring device 2 measuring device 3 mounting jig 21 measuring device body 22 start button 31 central portion 35 mounting portion 36 flange portion 37 holding portion 201 control portion (deviation determination means, gyro sensor inspection means)
203 operation unit 205 G sensor unit (acceleration sensor)
206 gyro sensor unit (gyro sensor)

Claims (7)

a mounting jig detachably attached to the rim of the steering wheel;
a measuring instrument body attached to the steering wheel via the attachment jig,
The mounting jig has a rod-shaped central portion and mounting portions positioned at both ends of the central portion and attached to the rim portion,
The measuring instrument body includes an acceleration sensor and a gyro sensor,
The measuring instrument main body is attached to the central part such that a jig reference axis defining the horizontal direction of the central part and a measuring instrument reference axis defining the horizontal direction of the measuring instrument main body are parallel,
deviation determination for determining a deviation between the jig reference axis and the measuring instrument reference axis based on a detection value of the acceleration sensor when the jig reference axis is parallel to a horizontal plane and a preset reference value; to have the means
A spoke angle measuring device characterized by: The acceleration sensor has a first axis of acceleration that coincides with the measuring instrument reference axis, and a second axis that is perpendicular to the measuring instrument reference axis and defines the horizontal direction of the measuring instrument main body together with the first axis. detecting acceleration and acceleration in a third axis perpendicular to the horizontal direction of the measuring instrument body;
The deviation determining means determines the deviation between the jig reference axis and the measuring instrument reference axis based on the acceleration values detected by the acceleration sensor in the first axis and the third axis. 2. The spoke angle measuring device according to claim 1. The deviation determination means calculates the deviation amount of the second axis based on the detected values of the accelerations of the first axis and the third axis detected by the acceleration sensor, and the calculated deviation amount is the reference value. 3. The spoke angle measuring device according to claim 2, wherein when the distance is larger than the jig reference axis, it is determined that there is a deviation between the jig reference axis and the measuring instrument reference axis. The deviation determination means determines the deviation between the jig reference axis and the measuring instrument reference axis when the deviation of the second axis is greater than the reference value and does not exceed a preset upper limit. 4. The spoke angle measuring device according to claim 3, wherein the spoke angle measuring device is calibrated. 4. The apparatus according to any one of claims 1 to 3, wherein the deviation determination means determines the deviation between the jig reference axis and the measuring device reference axis without using the detection value of the gyro sensor. The spoke angle measuring device according to . an operation unit;
gyro sensor inspection means for determining the state of the gyro sensor based on the detected value of the gyro sensor;
5. The apparatus according to claim 4, wherein an inspection mode including determination by said deviation determination means and determination of the state of said gyro sensor by said gyro sensor inspection means is executed according to an operation of said operation unit. Spoke angle measuring device. A spoke angle measuring device comprising: an attachment jig detachably attached to a rim portion of a steering wheel; and a measuring instrument main body attached to the steering wheel via the attachment jig, wherein the attachment jig and the measuring instrument A determination method for determining deviation from the main body,
The measuring device main body is mounted on the mounting jig in a direction in which the jig reference axis defining the horizontal direction of the mounting jig and the measuring device reference axis defining the horizontal direction of the measuring device main body are parallel to each other. ,
The jig reference axis is in a state parallel to the horizontal plane,
Determining a deviation between the jig reference axis and the measuring instrument reference axis based on a detection value of an acceleration sensor provided in the measuring instrument main body and a preset reference value;
A deviation determination method for a spoke angle measuring device, characterized by:

Images