Patent ID: 6571616
Filing Date: 2003-06-03
Classification: F02D

Abstract:
A method of easily measuring a brake mean effective pressure of a running vehicle using a chassis dynamometer, comprising the steps of:measuring an intake air amount with a flow meter; measuring a ratio of excessive air with a &lgr; sensor; measuring an intake air temperature with an intake air temperature sensor; measuring an intake air humidity with an intake air humidity sensor; measuring an intake air atmospheric pressure with an intake air atmospheric pressure sensor; calculating a specific fuel consumption based on the intake air amount and the ratio of excessive air; calculating an output of an engine based on a relation between the specific fuel consumption and an engine revolution number, the engine revolution number received from an engine revolution sensor; calculating a fuel supply weight based on an measurement from said flow meter, said intake air atmospheric pressure sensor, an engine speed sensor, and a vehicle speed sensor; and extrapolating a brake mean effective pressure from a characteristic curve based on said calculated fuel supply weight.