Common Powertrain Controller - Detroit Diesel MBE 900 Operator's Manual

The data is then compared to the
characteristic maps or lines stored in
the MCM. From these data, quantity
and timing of injection are calculated
and the unit pumps are actuated
accordingly through the solenoid
valves.
NOTE:
To obtain a replacement MCM, all
the data given on the MCM label are
required.
The MCM data label has the 10 digit
engine serial number.
Common Powertrain
Controller
The CPC communicates with any
other MCM unit installed on the
vehicle over the J1939 data link.
See Figure 19.
Data for specific applications is stored
in the CPC. These include idle speed,
maximum running speed, and speed
limitation.
All information subject to change without notice. (Rev. 04/08)
DDC-SVC-MAN-0040 0704 Copyright © 2008 DETROIT DIESEL CORPORATION
MBE 900 ENGINE 2007 OPERATOR'S GUIDE
Figure 19
The CPC receives data from the
following sources:
□ The operator (accelerator pedal
position, engine brake switch)
□ Other electronic control units
(for example, the anti-lock brake
system)
□ The MCM (oil pressure and
coolant temperature)
From these data, instructions are
computed for controlling the engine
and transmitted to the CPC via the
proprietary datalink.
The CPC controls various systems,
for example, communications with
the datalink, the engine brake, and the
constant-throttle valves.
CPC
41