F - Mech Eng,Light,Heat,Weapons – 01 – N
Patent
F - Mech Eng,Light,Heat,Weapons
01
N
172/4, 341/38.13
F01N 9/00 (2006.01) F01N 3/18 (2006.01) F01N 3/28 (2006.01) F02D 41/14 (2006.01)
Patent
CA 2033400
Apparatus system to control unwanted automotive emissions by use of a closed loop feedback system between an engine and catalyst, the system providing a feedback response time of less than 60 milliseconds and a resolution control for maintaining A/F ratio within ~ .01-.02% of stoichiometry irrespective of random combustion effects, variations in fuel injection, variations in intake air, variations in cylinder-to-cylinder conditions, and variations in exhaust turbulence. The system has: a low mass, three-way filter catalyst stationed close to the source of the stream and effective to filter out random combustion effects within the stream; a high mass, three-way main catalyst stationed downstream of the filter catalyst and effective to convert the remainder of noxious emissions in the stream to desired levels; (c) a continuous universal exhaust gas sensor stationed in the stream between said catalysts effective to rapidly and accurately indicate the level of oxygen within the stream leaving the filter catalyst; and (d) proportional, integral control means for adjusting in a closed loop the A/F of the mixture in response to a deviation of the sensed oxygen level from stoichiometry. The exhaust gas oxygen sensor is interactively related to the filter catalyst in time response to eliminate chemical noise, slow sensor response, and compensate for aging.
Ford Motor Company Of Canada Limited
Sim & Mcburney
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