Catalyst degradation test apparatus and catalyst degradation test method by exhaust flow measurement in actual driving of automobile

摘要

PPROBLEM TO BE SOLVED: To provide a device capable of easily displaying the accumulated deterioration function value of a catalyst by an integrated value of an exhaust gas flow rate, on the basis of a suction air volume, in particular, the device capable of finding easily the integrated value of the exhaust gas flow rate, representing the deterioration function value of the catalyst in actual travel inside a city or the like, without requiring special equipment. PSOLUTION: This device for testing the deterioration in the catalyst measures a gas temperature and pressure of an intake manifold 4 in a suction system, and an oxygen concentration therein, when necessary, in a bench test in a chassis dynamometer or the like of an automobile engine, measures the stroke volume and a rotation speed (intake process) of the engine 1 to be multiplied therewith, finds virtual suction air flow rate, compares a suction air flow rate measured accurately by another measuring instrument therewith, sets a correction factor for finding a suction air flow rate in the actual travel from singly the imaginary suction air flow rate, by each rotation speed region, to find the exhaust gas flow rate and the integrated value thereof, and displays the numerical value under actual travel conditions that affect the deterioration of a catalyst device. PCOPYRIGHT: (C)2007,JPO&INPIT