# US 11,441,971 B2 · Testing system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,441,971 B2 - Document ID: US11441971B2 - Status: Granted - Kind: B2 - Application number: 17/619,932 - Filed: 2020-03-18 - Published: 2022-06-30 - Granted: 2022-09-13 - Earliest claimed: 2019-06-19 - Assignees: Meidensha Corporation - Applicants: Meidensha Corporation - Inventors: Takao Akiyama - Web page: https://patentgrep.com/patent/US11441971B2 ## CPC - G01M 13/025: Test-benches with rotational drive means and loading means; Load or drive simulation - G01L 3/02: Rotary-transmission dynamometers - G01M 15/02: Details or accessories of testing apparatus - G01P 3/00: Measuring linear or angular speed; Measuring differences of linear or angular speeds (G01P5/00 - G01P11/00 take precedence; {direction and speed indication G01P13/045}; counting mechanisms G06M) - 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}) ## Abstract This testing system is provided with: an input side control device 5 for controlling an input side dynamometer to eliminate a deviation between a speed command signal w1ref and a speed detected signal w1; and an output side control device 6 for controlling output side dynamometer to eliminate a deviation between a torque command signal Tk1 ref and a torque detected signal Tk1. A control gain of the control device 5 is set such that the real part of a pole of a transfer function (w1/w1 ref) becomes greater toward the negative side than a value obtained by multiplying a resonant frequency by the negative sign, and a control gain of the control device 6 is set such that the real part of a pole of a transfer function (Tk1/Tk1 ref) becomes smaller toward the negative side than the real part of the pole of speed control system closed loop transfer function. ## Claims ### Claim 1 A testing system comprising: dynamometers which are respectively coupled to an input shaft and an output shaft of a test piece which can change a transmission gear ratio between input and output; a speed detector that generates a speed detection signal corresponding to a shaft speed of either one of the input shaft and the output shaft; a torque detector that generates a torque detection signal corresponding to a shaft torque of one other of the input shaft and the output shaft; a speed controller that controls the dynamometer coupled to the one of the input shaft and the output shaft such that a deviation between a speed command signal corresponding to a command for the speed, and the speed detection signal is eliminated; and a torque controller that controls the dynamometer coupled to the other one of the input shaft and the output shaft such that a deviation between a torque command signal corresponding to a command for the torque, and the torque detection signal is eliminated, wherein a control gain of the speed controller is set such that a real part of a pole of a speed control system closed-loop transfer function from the speed command signal to the speed detection signal becomes larger in a negative direction than a value obtained by multiplying a resonant frequency of a control target including the test piece by a negative sign, and a control gain of the torque controller is set such that a real part of a pole of a torque control system closed-loop transfer function from the torque command signal to the torque detection signal becomes smaller in the negative direction than the real part of the pole of the speed control system closed-loop transfer function. ### Claim 2 (depends on 1) The testing system according to claim 1, wherein the control gain of the torque controller is set such that the real part of the pole of the torque control system closed-loop transfer function becomes smaller in the negative direction than the value obtained by multiplying the resonant frequency of the control target by a negative sign. ### Claim 3 (depends on 1) The testing system according to claim 1, wherein the resonant frequency of the control target varies between a lowest frequency and a highest frequency by the transmission gear ratio varying, the control gain of the speed controller is set such that the real part of the pole of the speed control system closed-loop transfer function becomes larger in the negative direction than a value obtained by multiplying the highest frequency by a negative sign, and the control gain of the torque controller is set such that the real part of the pole of the torque control system closed-loop transfer function becomes smaller in the negative direction than a value obtained by multiplying the lowest frequency by a negative sign. ### Claim 4 (depends on 1) The testing system according to claim 1, wherein the control gain of the speed controller is set such that an imaginary part of the pole of the speed control system closed-loop transfer function becomes zero, and the control gain of the torque controller is set such that an imaginary part of the pole of the torque control system closed-loop transfer function becomes zero. ### Claim 5 (depends on 2) The testing system according to claim 2, wherein the resonant frequency of the control target varies between a lowest frequency and a highest frequency by the transmission gear ratio varying, the control gain of the speed controller is set such that the real part of the pole of the speed control system closed-loop transfer function becomes larger in the negative direction than a value obtained by multiplying the highest frequency by a negative sign, and the control gain of the torque controller is set such that the real part of the pole of the torque control system closed-loop transfer function becomes smaller in the negative direction than a value obtained by multiplying the lowest frequency by a negative sign. ### Claim 6 (depends on 2) The testing system according to claim 2, wherein the control gain of the speed controller is set such that an imaginary part of the pole of the speed control system closed-loop transfer function becomes zero, and the control gain of the torque controller is set such that an imaginary part of the pole of the torque control system closed-loop transfer function becomes zero. ### Claim 7 (depends on 3) The testing system according to claim 3, wherein the control gain of the speed controller is set such that an imaginary part of the pole of the speed control system closed-loop transfer function becomes zero, and the control gain of the torque controller is set such that an imaginary part of the pole of the torque control system closed-loop transfer function becomes zero. ### Claim 8 (depends on 5) The testing system according to claim 5, wherein the control gain of the speed controller is set such that an imaginary part of the pole of the speed control system closed-loop transfer function becomes zero, and the control gain of the torque controller is set such that an imaginary part of the pole of the torque control system closed-loop transfer function becomes zero.