Speed Control - Volvo D9 Installation Manual

Engine control interface, Speed control

Speed control

Pedal
BB1::VP70
evaluation
1
TSC1
BB1::TSC1
evaluation
speed
::SA 0x03
control
::SA 0x11
2
Target engine
speed/torque
P0021265
Schematic overview of speed control selection.
1 Pedal evaluation
2 TSC1 evaluation speed control
3 Pedal target engine speed
4 Target engine speed/torque
5 Source selector
16
Pedal target
engine speed
3
Source
selector
4
5
Target engine
speed/torque
4
There are two ways of controlling the engine speed:
1 'Accelerator pedal position' in the CAN message
VP70.
2 Speed control mode in TSC1.
Source selector
On Variable speed engines, 'Idle speed select' can be
used as 'limp home' in the event of faulty pedal.
Pedal evaluation
Pedal evaluation is primarily through Volvo Proprietary
message VP70 received on the BB1 CAN link.
If no valid VP70 messages are received, engine speed
will be set to idle speed.
Pedal evaluation considers one signal in the VP70
message: 'Accelerator pedal position'
Variable speed
The 'Accelerator pedal position' signal is interpreted as
a 0-100% request where 0% means idle speed and
100% equals maximum engine speed. In the case of a
pedal signal fault the engine will go to idle speed.
When all pedal signal requirements are fulfilled again,
the pedal signal will be considered valid only after a
valid zero (0%) pedal demand.
The VP70 pedal request will also be overridden if an
external request is received in a TSC1 CAN message.
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