Method and apparatus for enabling two or four wheel drive vehicl

Details Method and apparatus for enabling two or four wheel drive vehicl Method and apparatus for enabling two or four wheel drive vehicl

1991-04-05

1992-04-07

Myracle, Jerry W.

Measuring and testing

Vehicle chassis

Steering

G01L 322

Patent

active

051016605

ABSTRACT:
A dynamometer apparatus and a method for testing two and four wheel drive vehicles under simulated road conditions is described. The apparatus includes a front roll and a rear roll for engaging the front and rear wheels of the vehicle. A power supplying and/or absorbing unit such as an electric motor is coupled to each roll. In addition, a force transducer and speed sensor is coupled to each roll for providing signals representative of (a) the forces imported to or received by the rolls from the vehicle wheels minus the forces attributed to the parasitic losses of the rolls and (b) the speed of the rolls. Elements are also included for providing signals representative of the desired vehicle inertia and the forces attributable to the parasitic losses of the rolls. A system controller in response to the above signals controls the power supplying and/or absorbing units in accordance with: ##EQU1## where: V.sub.d =the desired velocity of the driven and driving rolls;

REFERENCES:
patent: 4161116 (1979-07-01), Fegraus et al.
patent: 4327578 (1982-05-01), D'Angelo
Roy F. Knudsen, Inertia--Electronically, ISA Journal, vol. 5, No. 4, Apr. 1958, pp. 52-54.
S. D'Angelo and R. D. Gafford, Feed-Forward Dynamometer Controller for High Speed Inertia Simulation, SAE, Jun. 8-12, 1981.

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