|The Infiniti Essence concept hybrid. Click to enlarge.|
Infiniti Europe unveiled the Infiniti Essence concept car at the Geneva Motor Show. The front-engined, rear-wheel drive, two-seat, 592 bhp (441 kW) luxury coupe provides the first motor show preview of Infiniti’s gasoline-electric hybrid drivetrain.
The Essence uses Infiniti’s familiar 3.7-liter V6 gasoline engine, but fitted with twin turbochargers, boosting power to 434 bhp (324 kW). The engine is equipped with a new direct-injection fuel system. The hybrid system uses a version of Nissan’s 3D Motor (also applied in the PIVO 2 electric vehicle concept), that offers twice the torque of a conventional unit.
|Conventional motor vs. Nissan’s 3D Motor. Click to enlarge.|
The performance of the 3D Motor is achieved by optimizing the layout of its electromagnetic coils and permanent magnets, and by adopting a 3D magnetic-flux-path structure to help the flux flow efficiently, according to Nissan.
Performance in an electric motor is determined by how the magnetic flux passes through the electromagnetic coil. By optimizing the layout of the electromagnetic coil and permanent magnet in the 3D Motor, it has been possible to use multi-phase current to deliver highly efficient control of the coil and effective use of the magnetic flux.
|The Essence hybrid system. Click to enlarge.|
In the Essence, the motor is positioned between the engine and transmission and provides 158 bhp (118 kW) with 500 Nm (369 lb-ft) of torque, drawing power from a compact lithium-ion battery pack in the trunk area. Because the 3D Motor operates in both propulsion and power regeneration modes, the battery pack is kept charged up.
Both the V6 and the electric motor feed their power only to the rear wheels, with two separate clutches “switching in” the engine and/or the motor as required. The Essence can operate in all-electric, all-engine or blended power-assist modes as a parallel hybrid system. In power assist mode, the full 592 hp is unleashed.
Estimated fuel consumption for the hybrid system is 8 L/100km (29.4 mpg US), with CO2 emissions of an estimated 190 g/km.