Within 2 years, a major European carmaker will offer an innovative eTurbo which is said to have reduced turbo lag; better low rpm engine torque and faster time-to-torque. BorgWarner, which developed and will produce the eTurbo, said it recently secured the supply contract for the high-performance turbocharger. While the carmaker’s name cannot be revealed at this time, it is confirmed that its passenger vehicle model will be the first mass-market eTurbo Application when it appears in 2022.
The eTurbo consists of a mechanical turbocharger with an electric motor directly coupled to the shaft which can serve as either a motor or a generator. The integrated solution delivers the traditional benefits of a standard turbocharger with the added advantage of electrified boost assistance for superior response.
Additional benefits include reduced emissions through after-treatment management and precise air/fuel ratio control. The electrical function can be deactivated to return it to normal turbocharger function, and EGR (Exhaust Gas Recirculation) can be driven on demand due to intentional back pressuring of the engine.
The eTurbo is claimed to deliver a more than 200% improvement in transient boost response along with steady state torque improvement. This enables further engine downsizing – an ongoing trend in the industry – resulting in better fuel economy and reduced emissions with no loss of performance.
BorgWarner says it is especially suited for Miller Cycle engines and can also improve performance for new combustion concepts due to electrical assist over complete engine speed range.
Beyond the vehicle performance aspects, the eTurbo can harvest excess exhaust energy and directly convert it to electrical energy to be used for accessory power or charging the battery. This has implications on the battery pack, which can be reduced in size and therefore have less weight.
While the eTurbo will be used first on a passenger vehicle, BorgWarner anticipates opportunities for future adoption in the commercial vehicle sector as well. The company has a range of eTurbo offerings, including full-performance 48-volt and high voltage compliant architectures. Additionally, customers have the choice of integrated or semi-integrated power electronics.
“BorgWarner’s eTurbo is a powerful and efficient solution, capable of delivering crucial benefits for our customers, including improved performance, better fuel economy, reduced emissions and more efficient energy usage,” said Joe Fadool, President & General Manager BorgWarner Emissions, Thermal and Turbo Systems. “We believe this is the largest industry award to date for this type of technology and is an important milestone for our company.”
