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DESCRIPTION AND OPERATION
GLOSSARY OF TERMS
(ASET™ ENGINES)
Air Pressure and Temperature Sensors at
CMCAC
Sensors are mounted into the air intake between
the CMCAC outlet and the EGR mixture tube.
Sensors monitor CMCAC outlet air temperature
and pressure.
Atmospheric Pressure Sensor
A sensor incorporated into the EECU that detects
atmospheric (barometric) pressure. This pressure
is affected by altitude.
Boost Pressure Relief Valve (BRV)
A valve which allows high turbocharger boost
pressure to be released into the exhaust or intake
air streams.
Breather Canister
A canister through which blow-by gases are
filtered to remove engine oil for return of oil to the
crankcase. The canister is mounted on the
engine front cover.
Breather Filter
A meshed metal filtration element inside the
breather canister. The element can be removed,
cleaned and reinstalled in the canister.
Carbon Monoxide (CO)
An odorless, colorless gas resulting from
incomplete combustion of hydrocarbons; found in
diesel truck exhaust; poisonous to humans and
animals.
Combustion Air Temperature and Humidity
Sensor
Sensor is mounted in the air intake between the
air cleaner and the turbo compressor housing
which detects outside air temperature and
humidity, and relays these values to the EECU.
Compressor Discharge Temperature Sensor
Sensor is mounted between the turbocharger
compressor housing and CMCAC. Detects
compressor discharge air temperatures.
Cooled Exhaust Gas Recirculation (CEGR)
A system whereby a pre-determined amount of
exhaust gas is diverted through a heat
exchanger, where it is cooled, and then routed to
the inlet manifold for reintroduction into the
combustion chambers. Adding the cooled
exhaust gases to the combustible fuel and air
mixture lowers the overall combustion
temperatures for reduced formation of nitrogen
oxides (NOx).
EGR MASS Flow System (EGR MFS)
The EGR MASS Flow System consists of the
cool-side EGR tube with its two integral probes
and associated wiring, and a control module. One
probe is a combination flow sensor/heater and
the other, a temperature sensor. Together, these
components form a calibrated unit that measures
the amount of exhaust gas being recirculated to
the engine.
Electronic Unit Pump (EUP)
An electronically controlled fuel injection pump,
one for each cylinder of an engine. The electronic
unit pumps are actuated by roller followers and
lobes on the engine camshaft.
Engine Electronic Control Unit (EECU)
A microprocessor-based controller, sometimes
referred to as a module, mounted to the inlet
manifold on the left side of the engine. For
ASET™ AC (CEGR) engines, it is mounted to a
cooling plate near the front of the manifold. For
ASET™ AI (IEGR) engines, it is mounted near
the rear of the manifold. With the MACK
V-MAC III system, the EECU controls fuel timing
and delivery, exhaust gas recirculation, fan
operation, engine protection functions and engine
brake operation.
Hydrocarbons (HC)
Gasoline, diesel fuel and motor oil are all
hydrocarbons. These are all examples of a very
large group of chemical compounds composed
only of carbon and hydrogen; the largest source
of hydrocarbons is from petroleum crude oil.
5-111.bk Page 80 Monday, July 10, 2006 2:26 PM
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