# US 10,371,589 B2 · Control device for dynamometer system

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- Number: US 10,371,589 B2
- Document ID: US10371589B2
- Status: Granted
- Kind: B2
- Application number: 15/544,492
- Filed: 2016-01-08
- Published: 2017-12-07
- Granted: 2019-08-06
- Earliest claimed: 2015-01-19
- Assignees: Meidensha Corporation
- Applicants: Meidensha Corporation
- Inventors: Takao Akiyama; Nobuhiko Asakura
- Web page: https://patentgrep.com/patent/US10371589B2

## CPC

- G01L 3/04: wherein the torque-transmitting element comprises a torsionally-flexible shaft
- G01L 3/242: {by measuring and simultaneously multiplying torque and velocity}
- G01L 25/006: {for measuring work or mechanical power or mechanical efficiency}
- G01M 15/04: Testing internal-combustion engines
- G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G)
- G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR

## Abstract

The purpose of the present invention is to provide a control device for a dynamometer system, with which, by a simple method, an unloaded state can be reproduced highly accurately when a test piece is started. A dynamo control device 6 is provided with: an integral control input computation unit 611 for computing the integral value of axle torque deviation, and multiplying the sum thereof and a correction value by an integral gain to compute an integral control input; a correction value computation unit 612 for multiplying an inertia compensation quantity Jcmp by the dynamo rotation frequency to compute a correction value; a non-integral control input computation unit 613 for designating, as a non-integral control input, the output of a prescribed transmission function Ge0(s) having axle torque deviation as input; and a totaling unit 614 for totaling the integral control input and the non-integral control input in order to generate a torque current command signal to the dynamometer. The transmission function Ge0(s) of the non-integral control input computation unit 613 is derived by separating the integrator from a transmission function Ge(s) having an axle torque control function, in such a way as to satisfy the relational equation (Ge(s)=Ki/s+Ge0(s)).

## Claims

### Claim 1

A dynamometer system including a dynamometer, a shaft that connects the dynamometer and a test piece, a shaft torque sensor that detects torque acting on the shaft, a rotation speed detector that detects a rotation speed of the dynamometer, an inertia compensation control device that generates a torque current command signal by executing an inertia compensation control based on a detection value of the shaft torque sensor and a detection value of the rotation speed detector such that an apparent inertia of the test piece observed from the test piece side diminishes by an amount corresponding to a correction coefficient, and an inverter that supplies electric power to the dynamometer according to the torque, the inertia compensation control device comprising:
an integral operation amount calculation unit that calculates an integral value of a deviation between the detection value of the shaft torque sensor and a command value thereof, and calculates an integral operation amount by multiplying a sum of the integral value and a predetermined correction value by an integral gain;
a correction value calculation unit that calculates the correction value by multiplying the detection value of the rotation speed detector by the correction coefficient;
a non-integral operation amount calculation unit that calculates a non-integral operation amount that is an output of a predetermined transfer function, into which the deviation is input; and
a totaling unit that generates a part of the torque current command signal by totaling the integral operation amount and the non-integral operation amount,
wherein a transfer function Ge0(s), of the non-integral operation amount calculation unit, is defined by separating an integrator from a transfer function Ge(s), of a feedback controller that outputs a torque current command signal, so as to cancel the deviation when the deviation is input, so as to satisfy the following formula where Ki represents the integral gain of the integrator and s represents a Laplacian operator:
Ge
⁡
(
s
)
=
Ki
s
+
Ge
⁢
⁢
0
⁢
(
s
)
.

### Claim 2 (depends on 1)

The dynamometer system according to claim 1, wherein the transfer function Ge(s) is designed based on a control system design method that is referred to as μ synthesis or H∞design method.