Patent ID: 6634218
Filing Date: 2003-10-21
Classification: G01M

Abstract:
An engine testing apparatus comprising:a dynamometer connected to an output section of an engine under test which is to be tested to simulate an actual vehicle running on a chassis dynamo; a dynamo controller for controlling rotation of the dynamometer; an actuator for controlling a throttle opening degree of the engine under test; and a computer in communication with the dynamo controller and the actuator and capable of controlling the dynamo controller and the actuator to adjust an output of the engine under test, the computer configured to compute and store a constant speed driving slip ratio (Sa) in a constant speed running state in a target vehicle speed pattern, an acceleration driving slip ratio (Sb) in an acceleration running state, and a deceleration driving slip ratio (Sc) in a deceleration running state; wherein the computer is capable of obtaining an engine target rotation number (Rr) by converting the target vehicle speed pattern by values of the driving slip ratios (Sa), (Sb) and (Sc) and corrects the engine rotation number (Rr) for each of the running states thereby resulting in a new engine target rotation number to be used at the time of simulation and controls the rotation of the dynamometer and corrects for tire slippage.