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Intake Exhaust Emissions

Intake Exhaust Emissions - Low to medium ‘speed stage...

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Unformatted text preview: Low to medium ‘speed stage High speed stage Fig. 24.2 Front View of dual-stage induction manifold sy Intake Air cleaner ' throttle valve Power—valve Valve 0 enin osition sensor Plenum p g p chamber Electronic motor servo I [’13 \ \ z» .s ~.. .‘ ~: H \i k: ‘! a~ 3: ~ ~ a: as a: n a! M i. \~ \ \ ‘ N H M N M Short secondary tract Long primary tract Long tract only open - Both tracts open i Engine torque (N m) .L __J__ L__ 1000 2000 3000 4000 5000 Engine speed (rev/min) Fig. 24.3 Torque-speedcharacteristics for dual-stage induction manifold system ' stem with merging primary and secondary tracts Ceramic E honeycomb CO l r — l HC {/””//A\\\\\\\\\\\\\\V Stainless steel casin ‘ I 9 l . NOX é} 4‘ V C02 . i Alumina ¥ 64 H20 Wire mesh support ‘ washcoat ’74)); ( N2 Platinum and ‘@/%W Ceramic honeycomb Three—pass absorbent rhodium ‘ matrix chamber C O a t ‘ n g “— "CEQEQI‘IJAIL'. Exhaust manifold JVIKWA'UJJEJW‘ Flange Joint l Exhaust 1/ ;. Intermediate silencer i] Twin forked ’ ' ‘ ‘ . exhaust pipe : down—pipe pipe Exhautst pipe l -Lambda . Shield Catalytic moun mg l sensor . converter l l l Fig. 24.13 Exhaust system with catalytic converter 626 3 2 . 1 03$ oEoEoEoEHw 16 4 1| 12 O 8 6 4 2 41 EEEO> >8 momma mExocoE :onomo Ucm mEXEU 5088 .com>xo woommucwome 10 12 14 Air/fuel ratio by mass Fig; 24.12 Exhaust gas composition for a typical petrol engine NO, CO, and HC concentrations (not to scale) 1.1 1.2 ...
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