Engine test apparatus

Patent metadata

Field	Value
Publication number	US-10309869-B2
Application number	US-201715658518-A
Country	US
Kind code	B2
Filing date	Jul 25, 2017
Priority date	Jul 27, 2016
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

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.

First claim

What is claimed is:

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.

2. 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.

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.

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.

Assignees

• A&D Co Ltd

Inventors

• Sugita Mitsuharu
• Egashira Yuta
• Yasuno Keisuke

Classifications

• G01S17/58

  Velocity or trajectory determination systems; Sense-of-movement determination systems · CPC title

• G01M15/02

  Details or accessories of testing apparatus · CPC title

• G01L3/16

  Rotary-absorption dynamometers, e.g. of brake type · CPC title

• G01L3/08

  involving optical means for indicating · CPC title

• G01M15/05

  by combined monitoring of two or more different engine parameters · CPC title