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Drive-dynamometer system

  • US 3,942,363 A
  • Filed: 02/28/1975
  • Issued: 03/09/1976
  • Est. Priority Date: 05/23/1973
  • Status: Expired due to Term
First Claim
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1. In a test stand for vehicle engines, means supporting an engine to be tested, and a hydrostatic system comprising a fixed displacement motor connected to the engine crankshaft and a variable displacement pump spaced from said motor and having motive means for driving it, said system being a closed hydraulic loop system connecting said motor and pump whereby the engine may be selectively cold-tested or hot-tested, the motor during hot-testing acting as a pump and the pump acting as a motor, means for adjusting the displacement of said pump, and a control loop system for said pump adjusting means to simulate different load or inertia conditions.

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