What is the Auto Desorb feature on MX Powered Peterbilt Chassis?

Automatic regens, also known as Auto Desorb, is a feature that gives new Peterbilt trucks the ability to perform a hydrocarbon (HC) desorb on its own. For example, on the MX Powered Peterbilt Chassis, this functionality is integrated into the aftertreatment system and doesn’t require a driver to perform regen functions manually. Without Auto Desorb, drivers need to complete a manual HC desorb after idling.
 

How does Auto Desorb work?

Auto Desorb maintains a low level of HC accumulation during extended idling by increasing engine speed and exhaust temperatures. By keeping a level of accumulated hydrocarbons in the aftertreatment, trucks are safe to drive with minimal risk of damage to Peterbilt truck parts. Auto Desorb is especially beneficial for cold climates and truckers who need to idle for more than three continuous hours. 
 

What are the benefits of Auto Desorb?

This functionality removes the burden on drivers to perform a manual HC desorb. Some of the benefits this provides include:

• Reduced downtime
• Less operational costs from lost time
• Prevent shortened aftertreatment life
• Prevent damages
• Reduce Peterbilt services on trucks
• Less maintenance costs

When activating Auto Desorb, drivers may experience unexpected speed changes. The speed returns to its previous setting when the Auto Desorb process is complete. 

Auto Desorb is activated when the: 

• Peterbilt truck is in neutral
• Truck’s speed is 0
• Accelerator pedal is not pressed
• Clutch is not pressed
• Foot brake is not pressed
• Diesel particulate filter (DPF) is not set to ‘regen inhibit’ 
• Aftertreatment or related engine devices have no faults
• Engine load is less than 600 lb-feet
• Engine speed is greater than 900 RPM, if the power take-off (PTO) is active
• Coolant is at operating temperature

Auto Desorb is deactivated when the:

• Speed is over 0
• Accelerator pedal is pressed
• Clutch is pressed
• Foot brake is pressed
• Parking brake is not set
• DPF switch is set to ‘regen inhibit’
• Aftertreatment or related engine devices have faults (overtemps, pre-DOC temp, etc.)
• Engine load is more than 600 lb-feet
• Engine speed is less than 900 RPM, if PTO is active
• Coolant is no longer at operating temperature

Auto Desorb adds a high degree of functionality to the MX Powered Peterbilt Chassis, benefiting the vehicle, businesses, as well as the driver. Contact our team at any one of our Brandt Truck & Trailer dealership locations across Ontario and Saskatchewan to learn more and help you decide on the cost-benefits of Auto Desorb.