May 26, 2022 — Power management company Eaton announced its eMobility business has introduced a 48-volt programmable power electronics control unit for electrically heated catalysts that can be used by commercial vehicle manufacturers to meet tightening global emissions regulations. Rapidly warming up the exhaust aftertreatment catalyst, and keeping it warm during low engine load operation, is essential for optimal performance to reduce harmful nitrogen oxide (NOx) exhaust emissions.

“Commercial vehicle manufacturers face new challenges generating and controlling this level of electrical power for a single vehicle accessory,” said Tom Stoltz, chief engineer, 48-volt Systems, Eaton’s eMobility business. “Our control unit helps them overcome these challenges and enables electrical integration in meeting future ultralow nitrogen oxide emissions regulations.”

The air-cooled electric catalyst heater controller is part of Eaton’s broader 48-volt electrical system portfolio, which contains several technologies that allow manufacturers to integrate 48-volt architectures in next-generation vehicles. Eaton’s family of electric heater power electronics controllers are being developed for solutions between 2 kW and 15 kW of power and operate with up to 99% peak efficiency. The controller is designed to receive power commands from the aftertreatment system, provide soft-start and soft-stop capabilities for assisting in maintaining system voltage control, and diagnostic feedback of the heater element.

“The aftertreatment catalyst heater controller contains all the necessary power electronics to smoothly deliver power to the heater and ensure the vehicle electrical system remains stable during heater operation,” Stoltz said.