Patent ID: 6378359
Filing Date: 2002-04-30
Classification: F01N,Y02T

Abstract:
A method of evaluating an on-board diagnostics system by using an emissions threshold catalytic brick in a laboratory exhaust system, the method comprising the steps of:determining a set of characteristics of the emissions threshold catalytic brick to be used in the laboratory exhaust system; thermally aging the emissions threshold catalytic brick; chemically aging the emissions threshold catalytic brick; normalizing the emissions threshold catalytic brick in an exhaust gas circulating oven; placing said emissions threshold catalytic brick in an exhaust system having the on-board diagnostics system to be evaluated; determining a set of values for the on-board diagnostics system in the laboratory exhaust system with said emissions threshold catalytic brick; and comparing said set of values with a set of known values to determine whether said on-board diagnostics system is functioning properly.