Diesel-Chapter 37 Detroit Diesel
synchronous reference sensor (SRS)
Detroit Diesel's term for a camshaft position sensor
timing reference sensor (TRS)
Detroit Diesel's term for a crankshaft position sensor
GHG14 aftertreatment device (ATD)
Detroit Diesel's term for aftertreatment system components that use electrically controlled DEF pumps and fluid dosing of the SCT rather than air pressure
virtual technician
a brand name for telematics communications package used to exchange information between a vehicle chassis and a central dispatch monitoring the operation of a vehicle.
axial power turbine (APT)
a device located after the turbocharger that uses a turbine wheel to capture exhaust energy and convert it to usable engine power
ethylene glycol
a fluid used by an antifreeze base and to lubricate O-rings and other types of elastomer seals that are not oil compatible.
nozzle return circuit
a fuel pathway from the ACR injectors leading to the low-pressure fuel module, which drains fuel from the NCV; also known as a needle return circuit
back leakage
a general term used to describe any fuel circuit or component that supplies or transports fuel from the engine to the fuel tank.
amplified common rail (ACR)
a high-pressure injection system that multiplies the fuel rail pressure inside the injector
rootes blower
a high-volume positive displacement air pump used to pressurize intake air for Detroit Diesel two-stroke cycle diesels
poppet control valve
a mushroom shaped valve used by unit injectors that operates under the influence of a magnetic field to open and close and injector spill port
balance shaft
a rotating shaft having an eccentric weight that is used to offset torsional vibration produced by an engine
heavy-duty on-board (HD-OBD) executive
a software program inside the MCM used to run monitors and make decisions about concerning the on-board diagnostic system.
height gauge
a tool used by technicians that is used to adjust the plunger travel of a unit injector for Detroit Diesel N2 injectors.
E3 EUI
a type of electronically controlled unit injector containing a nozzle control valve and spill control valve. Delphi manufactures E3 injectors for several OEM engine producers
asymmetrical turbocharger (AT)
a type of turbocharge that has one turbine volute made smaller than the other in order to increase exhaust backpressure for the EGR system
intake throttle valve
a valve used to regulate the quantity of fresh air entering the cylinders of an engine
calibration codes
alpha and/or numerical information assigned to a specific injector used by the ECM to correct for manufacturing tolerances of an injector; also called injector codes or fuel trim codes
common power train controller (CPC)
an ECM used to store and process vehicle-and application specific information
aftertreatment control module (ACM)
an electronic control module used to process sensor data and control the outputs for the DPF and SCR system
right-hand rotation engine
an engine that turns clockwise when viewed from the flywheel
left-hand rotation engine
an engine that turns counterclockwise when viewed from the flywheel
CR14 injector
another term for the amplified common rail injector
supercharger
any mechanical device used to pressurize the intake air above atmospheric pressure. Superchargers include rootes blowers and turbochargers
hydraulically balanced nozzle valve
fast-acting nozzle valve that opens and closes by slight changes in fuel pressure applied to the top and bottom of a nozzle valve.
spill control valve (SCV)
one of two control valves used in E3 and ACR injectors, which are used to vary spray in pressure of injectors. The timing of the SCV operation lowers or increases injection pressures
motor control module (MCM)
the electronic control module used by Detroit Diesel to control engine operation. The MCM receives sensor input, processes information using operating algorithms, and produces output signals
EPA07 emission standards
the emissions standard set by the EPA for medium and heavy duty diesel emissions in 2007. These standard are similar to Euro 5.
EPA10 emission standards
the emissions standard set by the EPA for medium and heavy duty diesel emissions in 2010. These standard are similar to Euro 6.
quantity control valve
the pulse-width modulated inlet metering valve used on the high-pressure pump of Detroit Diesel's ACR system. Its operation controls the pressure supplied to the high pressure fuel rail.
torsional vibration
the speeding up and slowing down of a crankshaft due to deceleration during compression strokes and acceleration during power strokes
injector response time (IRT)
the time it takes for each injector to build a magnetic field strong enough to operate the valve.
nozzle control valve (NCV)
the valve that controls the balancing of hydraulic pressure on either side of a hydraulically balanced nozzle valve; it opens and closes the nozzle valve.
