Installation Manual

Electrical & Electronic Application And Installation Manual
Production Release Version 1.0
Page 249 12/16/2014
above 1800rpm is requested then the engine speed will not respond and be
limited to 1800rpm.
20.2.1.4 Engine Torque Limiting
The Engine Torque limiting function, when configured limits the max torque
output of the engine to a value determined as a percentage of the max
available torque for the particular rating curve being operated. Figure 20.0
shows an example of an engine torque curve and the resulting engine
Figure 20.0 TSC1 Torque Limiting Operation
response once an 80% torque limit is transmitted via TSC1. As with the
speed limiting function the engine will operate as normal while the engine
torque requirement is less than 80% but will limit the engine torque output to
80%.
20.2.1.5 Arbitration For Multiple TSC1 Messages
Some OEM applications require the engine to respond to TSC1 messages
sent from more than one controller. The Perkins product range can support
TSC1 messages sent from more than 1 source address and the arbitration
applied adheres to the flow chart specified within the SAEJ1939-71 section
Appendix D. For more information please consult the SAE J1939-71
standard. If multiple controllers are used to send TSC1 messages to the
engine ECM the following rules must be applied.
• Each controller must have an individual Source Address
• Override control mode priority must be used to determine which
controller is master i.e. highest priority wins.
Please Contact your Applications Engineer for more information.
Torque (Nm)
Engine Speed (rpm)
Max Available Torque Value
(Peak Torque 1400rpm)
TSC1 Torque Limiting
Torque Limit = % of Max Available Torque Value
Torque Limit set to 80%
Engine Operating Area With A TSC1
Torque Limit Setting of 80%