Patent ID: 6662637
Filing Date: 2003-12-16
Classification: G01M

Abstract:
A map preparing method used for an engine testing apparatus or a vehicle testing apparatus comprising the steps of:varying a throttle valve from a fully closed position to a fully open position while maintaining an engine at a constant rotation; storing an output torque of the engine at at least three different engine RPMs relative to an throttle valve position; determining each of the obtained torque curves as actual machine data; and preparing a map based on the actual machine data, comprising: describing each of the torque curves on the same X-Y plane when preparing a map based on the actual machine data; converting actual machine data function for describing torque approximation curves with respect to throttle opening degrees (X axis) on the same X-Y plane while making approximations to the torque curves; determining the existence of intersecting torque approximation curves; and automatically correcting one of the torque approximation curves determined to be peculiar such that a value of a y-component of the torque approximation curve which appears peculiar among the intersecting torque approximation curves in the determining step assumes a median value of y-components of each of the vertically adjacent torque approximation curves.