Method and apparatus for testing internal combustion engines

Details Method and apparatus for testing internal combustion engines Method and apparatus for testing internal combustion engines

1987-11-24

1989-03-07

Myracle, Jerry W.

Measuring and testing

Vehicle chassis

Steering

73115, G01M 1500

Patent

active

048095400

ABSTRACT:
In a method and apparatus for the evaluation of a starter motor current or of a magnitude proportional to it for determining the relative compressions of the cylinders of an internal combustion engine, in order to eliminate the distortion of the compression relationships between the individual cylinders, account is taken of the current/speed characteristic of the starter motor. Using a direct current series motor as the starter, from the starter current there is derived a magnitude N proportional to the actual speed according to the relationship N =1/i+k*i where i is the motor current. The correction factor K serves to take account of the departure of the characteristic from a hyperbolic curve.

REFERENCES:
patent: 3952586 (1976-04-01), Hanson et al.
patent: 4062232 (1977-12-01), Sutphin, Jr.
patent: 4309900 (1982-01-01), Kreft et al.

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