Process for determining the movement resistance characteristics

Details Process for determining the movement resistance characteristics Process for determining the movement resistance characteristics

1978-03-16

1979-01-16

Ruehl, Charles A.

Measuring and testing

Brake testing

Single wheel rotating and resistance measuring means

73 9, 73432SD, G01M 1706

Patent

active

041342917

ABSTRACT:
To determine the characteristics of resistance to movement of an automobile vehicle several test runs are made with the internal combustion engine and transmission replaced by a working electric motor and drive to the wheels, and dummy engine and drive components to simulate the airflow resistance of these parts. Two separate tests at the same speed are made with and without a tare weight and from the power absorbed by the electric motor, in each case measured in terms of the electric power fed to the motor, and taking into account the efficiency of the motor and of the drive transmission connecting it to the drive wheels, the delivered power is determined. Subtraction of the delivered power values gives an indication of the power loss due to the effect of the tare weight on the rolling resistance, and hence the rolling resistance coefficient. Knowing that either one of the delivered power values will be equivalent to the sum of rolling power losses and air drag power losses enables the just computed rolling coefficient to be used to compute the rolling power losses in either of the previous runs and thereby allows the air drag losses, and hence the aerodynamic drag coefficient to be calculated.

REFERENCES:
patent: 3921446 (1975-11-01), Ludloff
patent: 3955410 (1976-05-01), Wakabayashi et al.
patent: 4003241 (1977-01-01), Thomas
patent: 4073188 (1978-02-01), Slezinger et al.

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