Method of and apparatus for determining the engine power of an automotive vehicle
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United States of America Patent
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Aug 6, 1991
Grant Date -
N/A
app pub date -
Mar 3, 1989
filing date -
Mar 10, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of and an apparatus for determining the engine power of an automotive vehicle on a roller dynamometer, the rollers of which can be braked with a constant brake poower. In accordance with the invention, in a first measuring operation the net power of the engine acting on the vehicle wheels is determined by sensing the braking power acting on the dynamometer rollers. In a second measuring operation, the slowing-down time is measured within which the speed has decreased from a predetermined value to a second preselected value with unbraked dynamometer rollers. In a third measuring operation the dynamometer rollers are braked with a consant brake power and the slowing-down time is measured within which the speed has decreased from the initial value to the preset final value. Thereafter, the internal power loss of the automotive vehicle is calculated. The gross power of the vehicle engine may be determined by adding the calculated power loss to the previously measured net power.
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