There are a number of interfaces available to control Volvo Penta engine. The interfaces are:
• Bus interface
• CIU
• DCU
The common thing about the three first interfaces is that the engine is controlled over two serial communication buses. The CIU and DCU uses the bus interface to communicate with the engine.
IMPORTANT!
If not, Volvo Penta equipment is always jeopardized.
Abbreviations
BAM Broadcast Announce Message
CAN Controller Area Network
DEF Diesel Emission Fluid
EATS Engine After Treatment System
EIC Engine Interface Connector
EECU Engine Electronic Control Unit
EMS Engine Management System
EMS 2 EMS used on TAD734GE, D9,
TAD125xVE, D13 and D16 engines FMI Failure Mode Identifier
OEM Original Equipment Manufacturer
SPN Suspect Parameter Number
VP Volvo Penta
Relevant documentation
• 7748665
Electrical interface specification industrial engines EMS and EMS2
• SAE J1939-73 • SAE J1939-71
Engine control interface
Volvo Penta industrial engines can be controlled in three different ways. Via bus interface, CIU or DCU. The bus interface is used by those who own control system and wants to control the engine over SAE J1939 and J1587. Volvo Penta provided two different systems to control the engines, the CIU that provides a number of digital / analogue outputs to the engine. The DCU has some digital / analog inputs and outputs.
CIU
This is the interface for those who want to make it.
DCU
This is the interface for the person who wants to make the engine without any button. But the possibility to make some customization is still here.
The DCU is equipped with a display that shows engine data and diagnostics translated to text.
Electrical interface
Bus interface
8-pole german connector recepticle.
Pin Description
1 CAN H
2 CAN L
3 Battery -
4 Battery +
5 Ignition and stop request if energized to run 6 Stop request energized to stop
7 J1587A
8 J1587B
Power up sequence
The system powers up when the ignition is switched on.
begin
A start request is addressed by the start signal. The engine will then start to crank and it will continue to do so until one of the following conditions becomes true.
• The start signal goes inactive.
• The engine speed exceeds a stated limit, typical about 480 rpm.
• The cranking time exceeds a stated limit, typical about 20 s. 30 s for genset engines.
Bus interface
Associated message:
J1939: Start request in VP status
J1587: Start request in PPID 98
CIU
Associated hardware / input:
Start request.
DCU
Associated hardware / input:
Start request.
Power down sequence
To perform a power down following sequence:
1 switch off the ignition
2 Send a stop request to the system.
3 When the power down sequence is finished the engine wants to stop communicating.
Auto shutdown wants power down the system. (Running engine wants to continue to run until a request is sent to the system).
External stop
External stop is placed in the 8-pin connector on pin 6.
Energized to STOP / RUN
Default external stop function is set to Energized to STOP. To use the stop function as Energized to STOP, apply EMS supply voltage on pin 6 to stop the engine.
By option or changing a parameter it can be set to Energized to RUN. To use the stop function as Energized to RUN, pin 6 needs EMS supply voltage for the engine to start and run. To stop the engine EMS supply voltage needs to be removed from pin 6.
Energized to RUN on Pin5
If the function "energized to run" is used on the pin 5 together with the ignition.
The main power MUST NOT be off before the power down is finished.
Stop
A stop request is addressed by the stop signal and stop the engine.
Bus interface
Associated message:
J1939: Stop request in VP status
J1587: Stop request in PPID 98
CIU
Associated hardware / input:
Stop request.
DCU
Associated hardware / input:
Stop request.
Throttle (Synchronizing / Load sharing)
Versatile
The driver pedal demand is realized by the throttle request signal. The signal is interpreted as 0-100% request where 0% means idle speed and 100% maximum engine speed. This demand only wants to be overridden if an error occurs that may damage the engine or a request with the CAN message TSC1.
Genset
This is used to control the engine speed in order to synchronize and to perform load sharing. 50% throttle to 1500 or 1800 rpm.
Bus interface
Associated message:
J1939: Throttle in VP status
J1587: PPID 132
CIU
Associated hardware / input:
Potentiometer supply, signal and ground.
DCU
Associated hardware / input:
Increase decrease engine speed buttons or potentiometer supply, signal and ground.
Torque speed control
It is possible to override the throttle that is sent in VP status. This is done with TSC1. When controlling the engine speed from the gear box (SA = 0x03) it always has the highest priority.
Bus interface
Associated message:
J1939: TSC1
J1587: N / A
CIU
Associated message:
J1939: TSC1
J1587: N / A
DCU
Associated message:
J1939: TSC1
J1587: N / A
Governor mode
The engine is normally running in isochronal mode. If there is a need for a smoother controller this can be realized by an active droop mode signal. When the governor mode signal is active then the functionality is added to the engine speed controller.
Bus interface
Associated message:
J1939: Governor mode in VP status
J1587: N / A
CIU
Associated hardware / input:
Governor mode request.
DCU
Associated hardware / input:
Available in the menu.
Idle switch
Versatile
If the throttle request is malfunctioning, the idle switch can be used for limp home driving.
If there is a fault on the pedal signal then the engine will go to idle speed. If then the idle switch first goes active and then goes inactive then the engine slowly ramps up the engine speed. The engine speed will be ramped up to a maximum of 80% of normal maximum engine speed. When releasing the pedal the engine will immediately go down to idle speed.
If an idle request is sent to the engine it will go to idle speed if the engine unloaded.
Bus interface
Associated message:
J1939: Idle request in VP status
J1587: N / A
2.11.2 CIU
Associated hardware / input:
Idle request.
CIU
Associated hardware / input:
Idle request.
DCU
Available in the menu
Preheat
This function is not valid for 124xGE.
If the following conditions are fulfilled.
• The coolant temperature is low.
• The engine is not running.
The preheat device wants to be activated for a time dependent on the coolant temperature. The engine therefore wants to decide, using the coolant temperature, if after heating should be used.
Preheating wants to be terminated immediately if the driver starts cranking.
It is possible for the costumers, using the Volvo Penta parameter setting tool, to choose if it should be preassembled.
Bus interface
Associated message:
J1939: Preheat request in VP status
J1587: N / A
CIU
Associated hardware / input:
Preheat request.
DCU
Associated hardware / input:
Available in the menu.
Frequency select
This function is only valid for genset applications.
The frequency switch is used to change the nominal engine speed (ie switching between 1500 and 1800 rpm). For safety reasons the frequency can only be changed when the engine is stopped.
EMS2 systems
Wait 2 second after the last stop request. Then change the state of frequency to the desired engine speed. Then send a stop request within 10 seconds after the first stop. The frequency select signal must change value during the frequency change. By the time the first time it is finished, the second stop request is issued.
It is possible to change the frequency using the Volvo Penta aftermarket tool.
Bus interface
Associated message:
J1939: Frequency select in VP status and diagnostic request in VP status.
J1587: N / A
CIU
Associated hardware / input:
Frequency select.
DCU
Associated hardware / input:
Available in the menu.
Engine protection override
It is possible to request engine protection override. When a request is made the engine will deactivate the engine protection for a predefined time.
Genset engines
The engine protection is disabled as long as the request is active and for another 10s.
Mobile / Versatile / Powerpack
The engine protection is disabled as long as the request is active and for another 10 seconds, but is maximized to 60 seconds.
Bus interface
Associated message:
J1939: Engine protection override request in VP status J1587: N / A
CIU
Associated hardware / input:
Engine protection override request.
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