US 6,662,637 B1 · Engine testing apparatus and map preparing method for an engine testing apparatus/vehicle testing apparatus

Abstract

The present invention provides a map preparing method for an engine testing apparatus or a vehicle testing apparatus capable of preventing a peculiar driving state from being generated. The method includes varying a throttle valve from its fully closed position to its fully opened position while maintaining a constant engine rotation number, carrying out operation for storing an output torque Nm at that time using at least three kinds of different engine rotation numbers, determining each obtained torque curves A˜E as actual machine data, and preparing a map based on the actual machine date. The map is prepared by describing each of the torque curves A˜E on the same X-Y plane based on the actual machine data, converting actual machine data function for describing torque approximation curves a˜e 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 a˜e and automatically correcting one of the torque approximation curves c which can be determined peculiar such that a value Y1 of y-component of the torque approximation curve c which appears peculiar among the intersecting torque approximation curves b and c in the determining step assumes a median value Y2, Y3 of values of y-components of the vertically adjacent torque approximation curves b and d.

Claims3

Dependent claims

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.

6 more elements

Dependencies are inferred from the claim text.

Engine testing apparatus and map preparing method for an engine testing apparatus/vehicle testing apparatus

Life of this patent

Engine testing apparatus and map preparing method for an engine testing apparatus/vehicle testing apparatus

Life of this patent

Abstract

Claims3