Specimen test apparatus controlled in part based on tire diameter in deformed state

Patent metadata

Field	Value
Publication number	US-11255754-B2
Application number	US-202016811399-A
Country	US
Kind code	B2
Filing date	Mar 6, 2020
Priority date	Mar 8, 2019
Publication date	Feb 22, 2022
Grant date	Feb 22, 2022

Abstract

The present invention is one that reproduces behavior close to an actual run of a vehicle in a test using a loading device, and is a specimen test apparatus that tests a specimen that is a vehicle or a part of a vehicle. The vehicle test apparatus includes: a loading device that is connected to a rotating shaft of the specimen and gives running resistance to the rotating shaft; a storage part that stores tire diameter data indicating the relationship between a running state of the specimen and a tire diameter; and a control part that, from the tire diameter data, calculates a tire diameter corresponding to a running state of the specimen, and controls the loading device with use of running resistance obtained from the calculated tire diameter.

First claim

The invention claimed is:

1. A specimen test apparatus that tests a specimen that is a vehicle or a part of a vehicle, the specimen test apparatus comprising:
a loading device that is connected to a rotating shaft of the specimen and gives running resistance to the rotating shaft;
a storage part that stores tire diameter data indicating a relationship between a running state of the specimen and a tire diameter during deformation; and
a load control part that acquires the running state of the specimen, calculates a tire diameter in a deformed state corresponding to the running state of the specimen based on the acquired running state and the tire diameter data, and controls the loading device with use of running resistance obtained from the calculated tire diameter in the deformed state, wherein the tire diameter in the deformed state is different than the tire diameter in an undeformed state.

2. The specimen test apparatus according to claim 1 , wherein
the load control part gives running resistance corresponding to running speed obtained from the calculated tire diameter and the rotating shaft of the specimen to the loading device.

3. The specimen test apparatus according to claim 1 , wherein
the tire diameter data is one indicating a relationship between at least any of rotation speed of the rotating shaft of the specimen, and running speed and acceleration of the specimen, and a tire diameter, and
from the tire diameter data, the load control part calculates a tire diameter corresponding to at least any of the rotation speed of the rotating shaft of the specimen, and the running speed and the acceleration of the specimen.

4. The specimen test apparatus according to claim 3 , wherein
the load control part calculates temporary running speed or temporary acceleration from the rotation speed of the rotating shaft of the specimen and a set tire diameter, and calculates a tire diameter from the calculated temporary running speed or the calculated temporary acceleration and the tire diameter data.

5. The specimen test apparatus according to claim 3 , wherein
the load control part calculates any of the rotation speed of the rotating shaft of the specimen, and the running speed and the acceleration of the specimen from a predetermined running pattern used to control the specimen, and from the tire diameter data, calculates a tire diameter corresponding to any of the rotation speed of the rotating shaft of the specimen, and the running speed and the acceleration of the specimen.

6. The specimen test apparatus according to claim 1 , wherein
the specimen is a four-wheel drive vehicle drive train,
the storage part stores front wheel tire diameter data indicating a relationship between a running state of the specimen and a front wheel tire diameter and rear wheel tire diameter data indicating a relationship between a running state of the specimen and a rear wheel tire diameter,
the loading device includes a front wheel side loading device connected to a front wheel rotating shaft and a rear wheel side loading device connected to a rear wheel rotating shaft, and
the load control part calculates a front wheel tire diameter corresponding to a running state of the specimen from the front wheel tire diameter data, calculates a rear wheel tire diameter corresponding to the running state of the specimen from the rear wheel tire diameter data, and controls the respective loading devices so that running resistances calculated with use of first running speed obtained from the calculated front wheel tire diameter and rotation speed of the front wheel rotating shaft and second running speed obtained from the calculated rear wheel tire diameter and rotation speed of the rear wheel rotating shaft are given.

7. The specimen test apparatus according to claim 6 , wherein
the load control part controls rotation speed of the front wheel side loading device and rotation speed of the rear wheel side loading device so that the first running speed and the second running speed coincide with each other.

8. A specimen test method that connects a loading device to a rotating shaft of a specimen that is a vehicle or a part of a vehicle, and gives running resistance to the rotating shaft to test the specimen, the specimen test method comprising:
calculating a tire diameter in a deformed state corresponding to a running state of the specimen based on an acquired running state and tire diameter data indicating a relationship between a running state of the specimen and a tire diameter during deformation, and controlling the loading device with use of running resistance obtained from the calculated tire diameter in the deformed state, wherein the tire diameter in the deformed state is different than the tire diameter in an undeformed state.

9. A tangible, non-transitory computer readable media that stores a specimen test program for connecting a loading device to a rotating shaft of a specimen that is a vehicle or a part of a vehicle, and giving running resistance to the rotating shaft to test the specimen, the specimen test program instructing a computer to comprise functions as:
a storage part that stores tire diameter data indicating a relationship between a running state of the specimen and a tire diameter during deformation; and
a control part that acquires the running state of the specimen, calculates a tire diameter in a deformed state corresponding to the running state of the specimen based on the acquired running state and the tire diameter data, and controls the loading device with use of running resistance obtained from the calculated tire diameter in the deformed state, wherein the tire diameter in the deformed state is different than the tire diameter in an undeformed state.

Assignees

• Horiba Ltd

Inventors

• Ikeda Hiroyuki

Classifications

• G01M17/0072

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• G01M15/04

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• G01M13/022

  Power-transmitting couplings or clutches · CPC title

• G01M13/023

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• G01M17/02 Primary

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