The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 07, 1992
Filed:
Apr. 05, 1991
John T La Belle, Long Beach, CA (US);
Clayton Industries, Santa Fe Springs, CA (US);
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;