ELYRIA, Ohio-Consider these three requirements for modern full-featured air dryer technology: provide more dry air for the systems that today's trucks rely on; improve energy efficiency; and air system diagnostics. The new Bendix® AD-HFi™ air dryer implements all three functions by adding electronic pressure control.
The AD-HFi model uses the same cutting-edge design as Bendix® AD-HF® dryers — introduced by Bendix Commercial Vehicle Systems LLC (Bendix) in 2019 — but uses solenoid valves to replace traditional mechanical governors.
"The electronically controlled governor means that we can use Bendix's Electronic Air Control (EAC) software to precisely adjust the dryer's charging and regeneration cycles," explains Rich Nagel, Bendix's director of air supply and drivetrain marketing and customer solutions. "This function enables the dryer to operate under different conditions under different parameters, thereby improving its dry air handling capacity and saving energy. The same software also provides diagnostic functions to help fleets and owner operators make full use of their dryers and ink cartridges. ."
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AD-HFi can be ordered through several major North American commercial vehicle manufacturers.
When using a traditional mechanical governor, the commercial vehicle air dryer has two fixed set points to determine when the compressor is charged and unloaded. When the system pressure is fully charged-usually 130 psi-the mechanical governor sends a pressure signal to tell the compressor to unload.
When the vehicle brakes—or any other pneumatic system using compressed air supply—the pressure drops, and at 110 psi, the governor sends a signal to the compressor again to build up pressure and charge the system.
When the state of the mechanical governor is operating within two fixed pressure settings, the solenoid valve of the Bendix® AD-HFi™ air dryer is controlled by electronic air control (EAC) software, which monitors a series of data on the truck's J1939 network Broadcast, including speed, engine torque and rpm.
"With the help of EAC software, the AD-HFi device can modify its charging cycle according to the air system and engine requirements," Nagel said. "If the software determines that the air system requires additional drying capacity-for example, if you are towing multiple trailers or have additional axles-then it can order additional short purge cycles.
"This patent-pending technology is called Interrupted Charge Regeneration (ICR). This enhanced purge capability provides more dry air for vehicles that need it."
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Brian Hagman Tel: 1 270 300 7001 Email: [Email protection] www.hagmanmedia.com
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