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Bendix Launches AD-HFi Air Dryer With Electronic Pressure Control Capabilities

By on September 16, 2021 0

Bendix announced a new AD-HFi air dryer which the company says features the same design as the previous AD-HF dryer, but incorporates a solenoid valve that replaces the traditional mechanical regulator.

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The new Bendix AD-HFi air dryer aims to meet three key requirements: more dry air for the systems that today’s trucks depend on; improved energy efficiency; and air system diagnostics – with the addition of electronic pressure control, the manufacturer said in a press release.

“An electronically controlled governor means we precisely regulate the dryer load and regeneration cycles using Bendix Electronic Air Control (EAC) software,” said Rich Nagel, Director of Marketing and customer solutions from Bendix, Air Supply and Drivetrain. “This function allows the dryer to operate under different parameters under different conditions, increasing its dry air handling capacity and saving energy. This same software also provides diagnostics that help fleets and owner-operators get the most out of their dryers and cartridges.

The Bendix AD-HFi air dryer solenoid is controlled by EAC software and monitors a range of data broadcast over a truck’s J1939 network, including speed, engine torque, and rpm.

“With the EAC software, the AD-HFi unit can change its charge cycle based on the demands of the air system and the engine,” Nagel said. “If the software determines that the air system requires additional drying capacity – say you tow multiple trailers or have additional axles, for example – then it can order additional short purge cycles. This patent pending technology is called interrupted charge regeneration (ICR). This improved bleeding capability provides much more dry air for vehicles that need it.

Efficiency and energy savings are also built into the EAC software in the form of overflow and overflow functions, Bendix noted. When a compressor increases pressure, it consumes approximately 8-10 HP from the engine. The EAC software uses the vehicle’s operating information to determine optimum compressor run times, Bendix explains.

The EAC software provides status messages related to the air dryer on the J1939 network, with the ability to monitor excessive air demand, which may indicate system leaks or other issues. It also monitors regeneration cycles and the amount of air processed over the life of a dryer cartridge. Using this information along with other compressor data, the EAC can signal when it is time to replace the cartridge.

A message that broadcasts the remaining life of the dryer cartridge can be reset after replacement using the Bendix ACom Pro diagnostic software.

The AD-HFi includes cartridge-type field-usable pressure protection valves (PPVs) and is designed to work only with a Bendix PuraGuard oil-coalescing screw-in cartridge, Bendix notes.

AD-HFi is available to order from several major North American commercial vehicle manufacturers.

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