DDEC System

All engines for 2010 are equipped with an electronic control system called Detroit Diesel Electronic Control (DDEC). The electronic engine control system regulates the fuel injection quantity and timing using solenoid valves, allowing extremely low-emission operation. Besides the engine and its related sensors, the system has three other control modules:

• Motor Control Module (MCM)
• Common Powertrain Controller (CPC)
• Aftertreatment Control Module (ACM)

The three control units are connected by a proprietary datalink through which all necessary data and information can be exchanged.

The MCM monitors both the engine and the datalink. When a malfunction or other problem is detected, the system selects an appropriate response; for example, the emergency running mode may be activated.

• The MCM processes the data received from the CPC, for example, the position of the accelerator pedal and engine brake.
• This data is evaluated together with the data from the sensors on the engine, such as coolant and fuel temperature and oil and charge pressure. The data is then compared to the characteristic maps or lines stored in the MCM. From this data, quantity and timing of injection are calculated.

The CPC broadcasts all information on datalinks. A certified service center technician can access the CPC via the datalink using the Detroit Diesel Diagnostic Link (DDDL) electronic diagnostic tool.

• The CPC communicates with the MCM unit installed on the vehicle over the proprietary datalink.
• Data for specific applications is stored in the CPC. Examples include idle speed, maximum running speed, and speed limitation.

The CPC receives data from several sources. Examples include:

• Accelerator pedal position, engine brake switch
• Anti-lock brake system and other electronic control units
• Oil pressure, coolant temperature and others, from the MCM

From this data, instructions are computed for controlling the engine and transmitted to the CPC via the proprietary datalink. The ACM monitors the Aftertreatment System (ATS). When a malfunction or other problem is detected, the system selects an appropriate response to deliver to the operator.