Lamborghini a dévoilé les détails de sa super voiture de sport hybride HPEV (High Performance Electrified Vehicle), LB744. Son nouveau groupe motopropulseur délivre plus de 1000 CV grâce à la combinaison d’un moteur à combustion interne avec trois moteurs électriques et d’une boîte de vitesses à double embrayage.
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New-Age Lamborghini
The new L545 engine has a capacity of 6.5 liters and is the lightest and most powerful 12-cylinder engine ever made by Lamborghini.
The naturally-aspirated 6.5-liter V12 mid-mounted engine is accompanied by three electric motors, one of which is integrated into the new double-clutch eight-speed gearbox. This is mounted transversely and placed for the first time behind the combustion engine.
A lithium-ion battery replaces the transmission tunnel, powering the electric motors. The electric motors boost power delivery at low revs and can also turn the new LB744 into a purely electric car.
In total the engine weighs just 218 kilograms, and the superquadro V12 puts out 825 CV at 9250 rpm, thanks to the redesigned distribution system that supports a maximum rev range of 9500 rpm. Specific power is 128 CV per liter, while maximum torque is 725 Nm at 6750 rpm (Photo: Lamborghini)
The air intake ducts to the cylinders have been re-engineered to increase the supply of air and guarantee optimal airflow in the combustion chamber. The combustion within the actual engine has also been optimized, thanks to the regulation of ionization in the chamber with two control units: a solution already used in the Aventador and now transferred to the new model.
The new combustion system is also characterized by an increased compression ratio of 12.6:1, and the fluid dynamics of the exhaust have also been improved to reduce counter-pressure at high revs and increase the specific power output.
Four-Wheel Drive
As well as the internal combustion engine that provides power to the rear wheels, a pair of electric motors now make their debut on the front axle, each supplying traction to one of the front wheels. There’s also a third electric motor positioned above the eight-speed double-clutch gearbox that can supply power to the rear wheels, depending on the selected driving mode and the conditions.
The two electric motors at the front are oil-cooled axial flux units and offer a weight-to-power ratio of 18.5kg from each of the 110 kW units.
As well as providing power to the front wheels, they also have a torque vectoring function, optimizing driving dynamics, and recuperating the energy produced under braking. When in electric mode, the LB744 is front-wheel drive only to optimize energy consumption, while electric drive to the rear axle is activated on demand when needed.
Zero-Emissions Performance
The Lamborghini LB744 is equipped with a lithium-ion high specific power (4500 W/kg) battery pack situated within the central tunnel, keeping the center of gravity as low as possible and ensuring optimal weight distribution. The battery is protected by a lower structural layer and is connected to the front electric motors, the rear electric motor, and an integrated recharging unit.
The combined torque from the combustion engine and three electric motors offers 725 Nm produced by the internal combustion engine, and 350 Nm from each of the front electric motors. In total, the power unit delivers a combined maximum output of 1015 CV (Photo: Lamborghini)
The battery is 1550mm long, 301mm high, and 240mm wide, containing pouch cells with an overall capacity of 3.8 kWh. When the charge drops down to zero it can be recharged using both ordinary domestic alternating and charging column current up to 7 kW in power, and completely recharges in just 30 minutes. It can also be recharged under regenerative braking from the front wheels or directly from the V12 engine in just six minutes.
New Transmission
The DCTis just 560mm long, 750mm wide and 580mm high. Total weight is just 193 kg, which includes a new component fundamental to the car’s hybrid architecture: the rear electric motor, with maximum power of 110kW and peak torque of 150Nm (Photo: Lamborghini)
Lamborghini has developed a new compact transmission unit, a wet double clutch capable of managing the 725 Nm of torque at 6750 rpm from the internal combustion engine. The development of an eight-speed Double Clutch Transmission (DCT) comes from the desire to create a unit that provides everything needed for sporty driving such as fast gear shifts, while the inclusion of an eighth ratio helps optimize fuel consumption and drivability while cruising.
How the system functions depends on which driving mode is engaged, thanks to an uncoupling mechanism with a dedicated synchroniser allowing the connection to the double-clutch gearbox.
The DCT is positioned transversally behind the longitudinal V12 engine, to leave space in the tunnel for the lithium-ion battery that feeds the electric motors. The layout helps to keep the car’s wheelbase contained and supports effective weight distribution for the best driving dynamics. (Photo: Lamborghini)
When it is providing additional power to the V12 internal combustion engine, the electric motor is in P3 position, separated from the gearbox, while it moves into the P2 position to recharge the battery at low speeds and when parked, also serving a starter motor.In the P3 position, the LB744 can become an electric four-wheel drive car, depending on the drive mode selected, continuing Lamborghini’s four-wheel drive tradition even with zero emissions.
Reverse gear is provided by the two front electric motors, although if extra momentum is needed the rear electric motor can also kick in, which activates the rear axle and wheels. As a result, the new LB744 can drive all four wheels in zero emission mode even when reversing in low grip conditions.
