1. An input/output device (3) to identify mechanical constants of an electric power steering apparatus, the input/output device (3) being configured to be connected, via an in-vehicle communication network provided in a vehicle, to a control device (2) for controlling a motor (1) provided in an electric power steering apparatus that generates an auxiliary steering force applied to a steering provided in the vehicle,
generate a vibration start instruction signal for starting vibration in the motor (1) on the basis of a vibration start instruction input from outside,
transmit the vibration start instruction signal to the control device (2) over the in-vehicle communication network, and
receive response data relating to the vibration of the electric power steering apparatus, the response data being detected by the control device (2) while the vibration is underway, from the control device (2) over the in-vehicle communication network.
2. The input/output device (3) as claimed in claim 1, wherein the
input/output device (3) comprises a mechanical constant calculation unit (38)
that calculates a mechanical constant indicating a mechanical characteristic of the
electric power steering apparatus on the basis of the response data.
3. The input/output device (3) as claimed in claim 1 or 2, wherein the response data include at least one of a steering torque exerted on the steering (51, 53), a rotation angle of the motor (1), a rotation speed of the motor, and a detected current of the motor (1).
4. The input/output device (3) as claimed in any one of claims 1 to 3, wherein the input/output device (3) comprises a sound detector (37) that detects sound generated in the vehicle during the vibration and outputs the detected sound as sound data.
5. The input/output device (3) as claimed in claim 4, wherein the
input/output device comprises a display unit (32) that displays the response data,
the sound data, or the mechanical constant.

6. The input/output device (3) as claimed in any one of claims 1 to 5, wherein the input/output device (3) comprises an amplitude input unit (34) that receives an amplitude value input from outside and indicating a vibration amplitude value of a vibration command by which the motor (1) is to be vibrated, sets the amplitude value as the vibration amplitude value of the vibration command, and transmits the set vibration amplitude value to the control device (2) over the in-vehicle communication network.
7. The input/output device (3) as claimed in any one of claims 1 to 6, wherein the input/output device (3) comprises an amplitude setting unit (310) that sets the vibration amplitude value of the vibration command by which the motor (1) is to be vibrated on the basis of the response data, and transmits the set vibration amplitude value to the control device (2) over the in-vehicle communication network.
8. The input/output device (3) as claimed in any one of claims 2 to 7, wherein the input/output device (3) comprises a control constant calculation unit (311) that calculates a control constant of the control device from the mechanical constant calculated by the mechanical constant calculation unit (38).
9. A steering measurement device comprising:
the input/output device (3) as claimed in any one of claims 1 to 8; and
a control device (2) that is connected to the input/output device (3) via the in-vehicle communication network provided in the vehicle in order to control the motor (1) provided in the electric power steering apparatus that generates an auxiliary steering force applied to the steering provided in the vehicle,
wherein
the control device (2) excites the motor (1) upon reception of the vibration start instruction signal from the input/output device (3), detects a response of the electric power steering apparatus to the vibration during the vibration, and transmits the detected response to the input/output device (3) as the response data.
10. The steering measurement device as claimed in claim 9, wherein the
control device (2) comprises a vibration command generation unit (25) that

the control device (2) excites the motor (1) on the basis of the vibration command generated by the vibration command generation unit (25) upon reception of the vibration start instruction signal from the input/output device (3).
11. The steering measurement device as claimed in claim 9, wherein the
input/output device (3) comprises a vibration command generation unit (25B)
that generates the vibration command by which the motor (1) is to be vibrated,
and
the input/output device (3) transmits the vibration command generated by the vibration command generation unit (25B) to the control device (2) over the in-vehicle communication network, and
the control device (2) comprises a storage unit (28) for storing the vibration command received from the input/output device (3), and
excites the motor (1) on the basis of the vibration command stored in the storage unit (28) upon reception of the vibration start instruction signal from the input/output device (3).
12. The steering measurement device as claimed in any one of claims 9 to 11, wherein the control device (2) transmits the response data and the vibration command corresponding thereto to the input/output device (3) over the in-vehicle communication network.
13. The steering measurement device as claimed in any one of claims 10 to 12, wherein the vibration command generation unit (25) generates the vibration command using random numbers or pseudorandom numbers.
14. The steering measurement device as claimed in any one of claims 9 to 13, wherein the control device (2) excites the motor (1) in a condition where a steering wheel (51) of the electric power steering apparatus is released.
15. A control device (2) for supplying current to and controlling a motor (1) provided in an electric power steering apparatus that generates an auxiliary steering force applied to a steering (51, 53) provided in a vehicle, the control

Claims as amended on February 13, 2020
device (2) being connected, via an in-vehicle communication network, to an input/output device (3) that generates a vibration start instruction signal for starting vibration in the motor (1),
the control device (2) being configured to excite the motor (1) upon reception of the vibration start instruction signal from the input/output device (3), detect a response of the electric power steering apparatus to the vibration during the vibration, and transmit the detected response to the input/output device (3) as response data.