Page 197 - Methods For Monitoring And Diagnosing The Efficiency Of Catalytic Converters A Patent - oriented Survey

Chapter I. 1 1

Suzuki Motor Corporation

The methods of Suzuki Motor Corp. for determining deterioration of a catalytic converter
have been applied for a layout similar to that of fig. 8 1 ,

The intake passage includes an air flow meter, an intake throttle valve and an intake manifold
which are sequentially connected from the upstream side. The intake passage in the intake
manifold is constructed by: a surge tank portion serving as an intake collecting section and first
to fourth parallel branch intake passage portions (only a single branch passage being shown in
fig. 81) which are branched from the surge tank portion. The first to fourth branch intake
passages are respectively communicated with first to fourth cylinders (only a single cylinder
being shown in fig. 8 1 ),

The exhaust passage is formed by an exhaust manifold, an upstream side exhaust pipe, a
catalytic converter, and a downstream side exhaust pipe which are sequentially connected from
the upstream side. The exhaust passage in the exhaust manifold is constructed by: first to
fourth parallel branch exhaust passages which are respectively communicated with the first to

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