Vehicle Speed Governor (General Overview)
Vehicle Speed Governor is a feature designed to regulate the maximum vehicle speed as controlled by the
accelerator pedal.Programmable parameters within the engine control module (ECM) provide vehicle speed governor relatedoptions that can be adjusted to suit the customer’s needs. A parameter is used to set the maximum accelerator controlled vehicle speed.
Additional programming flexibility is included to allow a trade off to be made between performance and fuel
economy.
Operation
This feature limits the maximum vehicle speed. If your engine reaches a certain speed and feels like it
should have more power to travel faster, you are probably traveling at the governed maximum speed limit.
Verify the “Accelerator Vehicle Speed Limit” (7902) parameter setting.
The driver controls for this feature work through the accelerator pedal only. There are no other operator
interactions involved, such as switches or indicators.
The following interlocks must be satisfied for vehicle speed governor to be active:
As long as the “Vehicle Speed Governor Enable” (7900) parameter is “enabled” and there are no
active vehicle speed sensor (VSS) faults, then the feature will be active.
NOTE: If the vehicle speed sensor (VSS) is faulted, the engine speed will be limited to the
programmable “Engine Speed Limit with VSS Fault” (7901) parameter setting Cruise Control and Accelerator Pedals – Fuel economy improvements can be realized by
encouraging the driver to use cruise by setting the “Maximum Cruise Control Speed” (7604)
parameter higher than the “Accelerator Vehicle Speed Limit” (7902) setting used by the “Vehicle
Speed Governor” feature. High fuel economy drivers can be rewarded by setting (7902) higher
than (7604) to allow passing opportunities when the accelerator pedal is required.
Engine Speed Limit with VSSFault (7901)
1200 to 2100 rpm
Vehicle Speed Governor is a feature designed to regulate the maximum vehicle speed as controlled by the
accelerator pedal.Programmable parameters within the engine control module (ECM) provide vehicle speed governor relatedoptions that can be adjusted to suit the customer’s needs. A parameter is used to set the maximum accelerator controlled vehicle speed.
Additional programming flexibility is included to allow a trade off to be made between performance and fuel
economy.
Operation
This feature limits the maximum vehicle speed. If your engine reaches a certain speed and feels like it
should have more power to travel faster, you are probably traveling at the governed maximum speed limit.
Verify the “Accelerator Vehicle Speed Limit” (7902) parameter setting.
The driver controls for this feature work through the accelerator pedal only. There are no other operator
interactions involved, such as switches or indicators.
The following interlocks must be satisfied for vehicle speed governor to be active:
As long as the “Vehicle Speed Governor Enable” (7900) parameter is “enabled” and there are no
active vehicle speed sensor (VSS) faults, then the feature will be active.
NOTE: If the vehicle speed sensor (VSS) is faulted, the engine speed will be limited to the
programmable “Engine Speed Limit with VSS Fault” (7901) parameter setting Cruise Control and Accelerator Pedals – Fuel economy improvements can be realized by
encouraging the driver to use cruise by setting the “Maximum Cruise Control Speed” (7604)
parameter higher than the “Accelerator Vehicle Speed Limit” (7902) setting used by the “Vehicle
Speed Governor” feature. High fuel economy drivers can be rewarded by setting (7902) higher
than (7604) to allow passing opportunities when the accelerator pedal is required.
Engine Speed Limit with VSSFault (7901)
This parameter sets the maximum engine speed allowed when an active vehicle speed sensor (VSS) fault
exits and PTO engine speed control is not active. This parameter might be useful in preventing the
operator from exceeding the “Accelerator Vehicle Speed Limit” (7902) parameter setting by tampering
with the vehicle speed sensor.
1200 to 2100 rpm
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