| 摘要 |
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. The present invention provides a map preparing method used for an engine testing apparatus or a vehicle testing apparatus capable of enhancing the simulation accuracy by calculating an average value in throttle valve opening direction S and an average value in throttle valve closing direction G from variation of the throttle valve operation speed 33, determining the average value of the throttle valve in the throttle valve opening direction S obtained by the calculation as a representative value corresponding to the throttle valve operating in the throttle valve opening direction in a driving mode, operating the throttle valve in its opening direction in a state where the engine rotation number is made constant by the representative value and describing the torque curves 35 with a plurality of different engine rotation number, and preparing a map for the throttle valve opening direction based on the obtained torque curves 35, determining the average value of the throttle valve in the throttle valve closing direction G obtained by the calculation as a representative value corresponding to the throttle valve operating in the throttle valve closing direction in a driving mode, operating the throttle valve in the closing direction in a state where the engine rotation number is made constant by the representative value G and describing the torque curves 36 with a plurality of different engine rotation numbers; and preparing a map for the throttle valve closing direction based on the obtained torque curves 36. The present invention provides an engine testing apparatus capable of carrying out a simulation of an actual vehicle running with high accuracy. The testing apparatus comprises a dynamometer 3 connected to an output section 2a of an engine 2 which is to be tested, a dynamo controller 3' for controlling the dynamometer 3, and an actuator 5 for controlling a throttle opening degree of the engine 2 under test. The dynamo controller 3&
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