Programming – Auto Retarder in Cruise

Description:
Auto Retarder in Cruise determines the miles per hour (km/h) value above the cruise set speed that the engine retarder will turn On. The Retarder switch must be in the On position and cruise control set, for this feature to operate. Programming the Auto Retarder in Cruise parameter to 0 (zero) will disable the feature. This parameter works in conjunction with the Auto Retarder in Cruise Increment parameter. The initial braking level (Low or Hi) of retarding is dependent on the value of the Auto Retarder in Cruise Increment parameter.

Example: The cruise speed is set at 55 MPH and Auto Retarder in Cruise parameter is programmed to 3 MPH. When the truck accelerates to 58 MPH, by going down hill, the retarder will activate.

Available:
All electronically programmed on-highway engines

Range:

Advantages:
Auto Retarder in Cruise can increase driver comfort and reduce driver fatigue while maintaining the desired road speed.

Note: The maximum Retarder level is determined by the Retarder Level switch position.

Disadvantages:
Programming this parameter to a speed that is too low can result in a degraded fuel economy. See Recommendations and the Auto Retarder in Cruise Increment parameter discussion to avoid this effect.

Recommendations:
If Auto Retarder in Cruise is desired, program the parameter to 3 – 5 MPH (5 – 8 km/h) to take advantage of SoftCruise. The minimum setting with Soft Cruise is 3 MPH due to the fact that Soft Cruise requires 2.5 MPH to work correctly.

 

 

 

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