Page 20 - Penske_Student Guide Book

Content Notes Content
Fuel Mixer
 Used on Cummins CNG
engines

 Fuel-control valve meters gas
flow

 Fuel mixer blends air, fuel,
EGR

Light-Duty Emissions Controls  Bi-fuel – same components

as gasoline
 EGR
 Catalytic converter
 Evaporative emissions

system

 Dedicated NGV
 EGR on most
 Catalytic converter
 No evaporative emissions

system

Cummins Natural Gas Engine  Exhaust gas recirculation -
Emissions Control System
EGR

 Three-way catalyst - TWC

 Not required for NGVs
 DEF – exhaust fluid
 DPF – diesel particulate

filter
 SCR – selective catalyst

reduction
 Regeneration procedure

Optional Methane Gas Detection  Alerts driver if there is

System natural gas leaking into

the vehicle

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