Method of controlling a dynamometer

Details Method of controlling a dynamometer Method of controlling a dynamometer

1988-01-25

1989-05-02

Ruehl, Charles A.

Measuring and testing

Vehicle chassis

Steering

7386218, G01L 322, G01L 513

Patent

active

048256900

ABSTRACT:
A method for controlling a dynamometer used to simulate the on-road operation of a vehicle during testing on a dynamometer so as to achieve a more accurate matching of the on-road speed profile of the vehicle by the dynamometer. The dynamometer includes means for drivingly connecting the dynamometer to the powertrain of the vehicle, such as rollers on which the drive wheels of the vehicle rest and which are rotated by the vehicle drive wheels, or a direct drive to the output shaft of the vehicle engine and transmission. A power absorption and motoring unit is connected to the rollers or direct drive to simulate road operating forces. A force transducer is provided for measuring the force of the power absorption and motoring unit and a speed transducer is provided for measuring the speed of the power absorption and motoring unit. The force and speed of the power absorption and motoring unit are determined at short, precise time intervals to determine changes in the force produced by changes in the power of the vehicle. The feed-forward force necessary to bring the force of power absorption and motoring unit to the force required to control vehicle acceleration and speed to road equivalency is determined, and the power absorption and motoring unit force is adjusted to the determined value. This feed-forward force includes a factor which compensates for speed matching errors which result from large differences between the effective mass of the vehicle and the dynamometer.

REFERENCES:
patent: 4161116 (1979-07-01), Fegraus et al.
patent: 4327578 (1982-05-01), D'Angelo
"Feed-Forward Dynamometer Controller for High Speed Inertia Simulation", Severino D'Angelo and R. D. Gafford; SAE Technical Paper Series; Passenger Car Meeting, Dearborn, Jun. 8-12, 1981.

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