# US 10,309,869 B2 · Engine test apparatus

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- Number: US 10,309,869 B2
- Document ID: US10309869B2
- Status: Granted
- Kind: B2
- Application number: 15/658,518
- Filed: 2017-07-25
- Published: 2018-02-01
- Granted: 2019-06-04
- Earliest claimed: 2016-07-27
- Assignees: A&D Company, Limited
- Applicants: A&D Company, Limited
- Inventors: Mitsuharu Sugita; Yuta Egashira; Keisuke Yasuno
- Web page: https://patentgrep.com/patent/US10309869B2

## CPC

- G01M 15/042: {by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12}
- G01L 3/08: involving optical means for indicating
- G01L 3/16: Rotary-absorption dynamometers, e.g. of brake type
- G01M 15/02: Details or accessories of testing apparatus
- G01M 15/05: by combined monitoring of two or more different engine parameters
- G01P 3/36: Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light (G01P3/68 takes precedence; gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams G01C19/64)
- G01S 17/58: Velocity or trajectory determination systems; Sense-of-movement determination systems
- G01S 17/88: Lidar systems specially adapted for specific applications
- G01L 1/25: using wave or particle radiation, e.g. X-rays {, microwaves}, neutrons (G01L1/24 takes precedence)
- G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G)
- G01P: MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT (measuring or recording blood flow A61B5/02, A61B8/06; monitoring speed or deceleration of electrically-propelled vehicles B60L3/00; vehicle lighting systems adapted to indicate speed B60Q1/54; determining position or course in navigation, measuring ground distance in geodesy or surveying G01C; combined measuring devices for measuring two or more variables of movement G01C23/00; measuring velocity of sound G01H; measuring velocity of light G01J7/00; measuring direction or velocity of solid objects by reception or emission of radiowaves or other waves and based on propagation effects, e.g. Doppler effect, propagation time, direction of propagation, G01S; measuring speed of nuclear radiation G01T; measuring acceleration of gravity G01V; {measuring or recording the speed of trains B61L23/00; speed indicators incorporated in motor vehicles B60K35/00; measuring frequency or phase G01R; traffic control G08G})
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES

## Abstract

An engine test apparatus includes a dynamometer connected to an engine through a shaft, and a control device configured to control operations of the engine and the dynamometer, and the engine test apparatus further includes a speed measuring device configured to measure a rotation speed of the output shaft of the engine and transmit the rotation speed to the control device the control device includes an engine control unit configured to control operation of the engine, and a dynamometer control unit configured to control operation of the dynamometer, the dynamometer control unit uses the rotation speed transmitted from the speed measuring device to generate a torque current command corresponding to a torque value to be generated by the dynamometer, in order to operate the engine controlled to be operated by the engine control unit in an unloaded state as if the shaft and the dynamometer are not connected.

## Claims

### Claim 1

An engine test apparatus comprising:
a dynamometer connected to an engine through a shaft; and
a control device configured to control operations of the engine and the dynamometer,
wherein the shaft has one end connected to an output shaft at one end of a rotation shaft of the engine, and the other end connected to a rotation shaft of the dynamometer, and
includes a speed measuring device configured to measure a rotation speed of the output shaft of the engine and transmit the rotation speed to the control device,
the control device includes an engine control unit configured to control operation of the engine, and a dynamometer control unit configured to control operation of the dynamometer,
the dynamometer control unit performs inertia compensation control by using the rotation speed transmitted from the speed measuring device to generate a torque current command corresponding to a torque value to be generated by the dynamometer, and outputting the torque current command to the dynamometer, in order to control operation of the dynamometer to operate the engine controlled to be operated by the engine control unit in an unloaded state as if the shaft and the dynamometer are not connected, wherein
the speed measuring device may be an encoder including a rotating slit disk mounted to the one end of the shaft or the rotation shaft of the engine, a light emitting element configured to emit light to the rotating slit disk, and a light reception control device configured to receive light passing through a slit of the rotating slit disk, detect a rotation speed from the received light, and transmit the rotation speed to the control device.

### Claim 2 (depends on 1)

The engine test apparatus according to claim 1, wherein
the dynamometer control unit removes predetermined high-frequency noise from the rotation speed transmitted from the speed measuring device, performs resonance correction process to reduce a gain of a preset specific frequency from a rotation speed from which the high-frequency noise has been removed, recovers a phase delay amount of a preset frequency range by a phase lead compensation process for a rotation speed subjected to the resonance correction, and uses a rotation speed subjected to the phase lead compensation process to generate the torque current command.

### Claim 3

An engine test apparatus comprising:
a dynamometer connected to an engine through a shaft; and
a control device configured to control operations of the engine and the dynamometer,
wherein the shaft has one end connected to an output shaft at one end of a rotation shaft of the engine, and the other end connected to a rotation shaft of the dynamometer, and
includes a speed measuring device configured to measure a rotation speed of the output shaft of the engine and transmit the rotation speed to the control device,
the control device includes an engine control unit configured to control operation of the engine, and a dynamometer control unit configured to control operation of the dynamometer,
the dynamometer control unit performs inertia compensation control by using the rotation speed transmitted from the speed measuring device to generate a torque current command corresponding to a torque value to be generated by the dynamometer, and outputting the torque current command to the dynamometer, in order to control operation of the dynamometer to operate the engine controlled to be operated by the engine control unit in an unloaded state as if the shaft and the dynamometer are not connected, wherein
the dynamometer control unit removes predetermined high-frequency noise from the rotation speed transmitted from the speed measuring device, performs resonance correction process to reduce a gain of a preset specific frequency from a rotation speed from which the high-frequency noise has been removed, recovers a phase delay amount of a preset frequency range by a phase lead compensation process for a rotation speed subjected to the resonance correction, and uses a rotation speed subjected to the phase lead compensation process to generate the torque current command.

### Claim 4

An engine test apparatus comprising:
a dynamometer connected to an engine through a shaft; and
a control device configured to control operations of the engine and the dynamometer,
wherein the shaft has one end connected to an output shaft at one end of a rotation shaft of the engine, and the other end connected to a rotation shaft of the dynamometer, and
includes a speed measuring device configured to measure a rotation speed of the output shaft of the engine and transmit the rotation speed to the control device,
the control device includes an engine control unit configured to control operation of the engine, and a dynamometer control unit configured to control operation of the dynamometer,
the dynamometer control unit performs inertia compensation control by using the rotation speed transmitted from the speed measuring device to generate a torque current command corresponding to a torque value to be generated by the dynamometer, and outputting the torque current command to the dynamometer, in order to control operation of the dynamometer to operate the engine controlled to be operated by the engine control unit in an unloaded state as if the shaft and the dynamometer are not connected, wherein
the speed measuring device is a Doppler velocimeter configured to emit laser light to the one end of the shaft or the output shaft of the engine to contactlessly measure a rotation speed of the output shaft of the engine, and transmit the rotation speed to the control device, wherein
the dynamometer control unit removes predetermined high-frequency noise from the rotation speed transmitted from the speed measuring device, performs resonance correction process to reduce a gain of a preset specific frequency from a rotation speed from which the high-frequency noise has been removed, recovers a phase delay amount of a preset frequency range by a phase lead compensation process for a rotation speed subjected to the resonance correction, and uses a rotation speed subjected to the phase lead compensation process to generate the torque current command.