New exhaust heat recovery system to help HEVs and PHEVs improve efficiency

by Autocar Pro News Desk , 01 Aug 2018


BorgWarner's Exhaust Heat Recovery System EHRS claimed to improve fuel economy by up to 8.5 percent and reduce emissions significantly.

BorgWarner, the global product leader in clean and efficient technology solutions for combustion, hybrid and electric vehicles, has announced development of an innovative solution for hybrid electric vehicles (HEVs) and plug-in hybrid electric vehicles (PHEVs). The company’s Exhaust Heat Recovery System (EHRS) is set to enter production later this year for vehicles from a major North American automaker.

By using the heat from exhaust gas which would normally be diverted through the exhaust pipes and wasted, the company’s technology reduces engine warm-up time, enhances efficiency and significantly improves fuel economy and reduces emissions. This cost-effective solution offers compact packaging, low weight and can easily be integrated into existing vehicles.

“Until a cold engine reaches its optimal operating temperature, it is much less fuel efficient and generates higher emissions, which is one of the challenges to master for upcoming emissions regulations. Our EHRS minimizes engine heat up time, helping automakers around the globe meet new and more stringent regulations,” said Joe Fadool, president and general manager, BorgWarner Emissions & Thermal Systems. “With the EHRS, BorgWarner serves the growing demand for highly efficient solutions to reduce emissions and strengthens its position as a leading supplier of clean technologies.”

Combining an exhaust gas recirculation (EGR) system with a waste heat recovery system (WHRS), BorgWarner leveraged its experience in heat transfer and exhaust gas aftertatment technologies, such as EGR coolers and valves, to come up with EHRS. The EHRS reduces mechanical losses by using the energy conserved within the exhaust gas. During engine cold starts, a valve controls the exhaust gas flow, routing it through a heat exchanger, where the thermal energy of the gas heats up the vehicle’s subsystem fluids. As a result, the engine warms up faster, reducing emissions and improving fuel efficiency. BorgWarner says its low-pressure EGR valve precisely controls the temperatures in the combustion chamber, improving engine efficiency and combustion timing. In addition, the technology reduces carbon monoxide (CO) and nitrogen oxide (NOx) emissions as well as particulate matter (PM).