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Volvo Cars introduces Twin Engine technology in world’s most powerful and cleanest SUV

The first Volvo designed from the ground up for plug-in/electrification compatibility, the XC90 T8 delivers all the performance of a luxury SUV, but with emission levels that even small hybrid cars struggle to match. When designing the XC90 T8, Volvo Cars chose not to compromise on performance, driving pleasure, efficiency or even luggage space. By … Continued

The first Volvo designed from the ground up for plug-in/electrification compatibility, the XC90 T8 delivers all the performance of a luxury SUV, but with emission levels that even small hybrid cars struggle to match.

When designing the XC90 T8, Volvo Cars chose not to compromise on performance, driving pleasure, efficiency or even luggage space. By building on the new modular Scalable Product Architecture (SPA) platform and successful Drive-E petrol powertrain, the company has created a uniquely roomy 7-seater SUV that delivers 400hp/640Nm combined with ultra-low emissions (59g/km) and high fuel efficiency (2.5 l/100km). The fuel economy according to the U.S. driving cycle is 59 MPGe.

“The XC90 T8 is a plug-in electric car, hybrid car and high-performance car rolled into one,” says Dr Peter Mertens, Senior Vice President Research and Development of Volvo Car Group. “The Drive-E engines already offer highly competitive performance versus the competition. The T8 takes it further into a leading position.”

The first Volvo designed from the ground up for plug-in/electrification compatibility, the XC90 T8 delivers all the performance of a luxury SUV, but with emission levels that even small hybrid cars struggle to match.

When designing the XC90 T8, Volvo Cars chose not to compromise on performance, driving pleasure, efficiency or even luggage space. By building on the new modular Scalable Product Architecture (SPA) platform and successful Drive-E petrol powertrain, the company has created a uniquely roomy 7-seater SUV that delivers 400hp/640Nm combined with ultra-low emissions (59g/km) and high fuel efficiency (2.5 l/100km). The fuel economy according to the U.S. driving cycle is 59 MPGe.

“The XC90 T8 is a plug-in electric car, hybrid car and high-performance car rolled into one,” says Dr Peter Mertens, Senior Vice President Research and Development of Volvo Car Group. “The Drive-E engines already offer highly competitive performance versus the competition. The T8 takes it further into a leading position.”

Under the shell

Many of the XC90 T8’s powertrain features have been optimised specifically for hybrid technology. Here are the main components of the system:

Drive-E engine

A specially modified version of the 4-cylinder Drive-E petrol engine is under the hood. Already known for its ability to more efficiently deliver the power of an engine twice its size, the Drive-E engine is enhanced in the XC90 T8 by a supercharger and a turbocharger for a total power output of 318hp and 400Nm torque.

Automatic gearbox

The 8-speed automatic gearbox has also been specially adapted for the hybrid: shift-by-wire technology allows drivers to control the transmission electrically (a luxurious touch is the gearshift is made of handmade Swedish crystal). A larger oil pump provides the necessary lubrication during electric drive and enables quicker pressure build-up when seamlessly going from electric to combustion drive.

CISG

The crankshaft-mounted starter generator (CISG), located between the engine and the gearbox, performs three important functions: it is a powerful, 34kW starter motor that allows the car to go from pure electric drive to combination combustion drive seamlessly, so drivers can experience the car’s petrol engine and electric motor as one unit; it is also a powerful electric generator; and finally, it acts as an electric engine booster, working with the supercharger and turbocharger when extra power is needed, providing up to 150 Nm of extra torque.

Battery

The high-voltage (270–400V) battery, delivering 65kW of power, is an excellent example of Volvo’s success with the XC90 T8. While other carmakers have struggled to combine the bulk of a battery pack with a luxurious and spacious interior, Volvo has managed to overcome this challenge by placing the battery centrally in the tunnel of the car. There are several advantages to this position. For example, the battery does not impact the amount of available space inside the car. This means that there is room for three rows of seats – plenty of space for people and luggage. Furthermore, the battery placement gives the SUV a low and central centre of gravity, making the XC90 T8 easier to handle and safer to drive.

Rear electric motor

Delivering 82hp (60kW) and 240Nm torque, the large electric motor sits on the rear axle and drives the back wheels in electric and power-boost modes. The rear placement is significant because it allows for a larger motor, which is useful for following stop-and-go city traffic rhythms. This placement also makes efficient all-wheel drive possible because each axle has its own power source.

Two-step braking system

The XC90 T8 blended braking system partly uses brake-by-wire technology to recover and transmit energy back into the car, either to recharge the battery or for immediate use. The system is also equipped with a unique stability function that controls the amount of energy that may be safely regenerated.

Unique cooling and climate system

The unique cooling system is composed of two extra circuits. The first cools the CISG and the large electric motor on the rear axle, while the second cools the battery in one of two ways: either passively, via the radiator, or actively through integration with the car’s climate system.

Pre-conditioning

For convenience and efficiency, drivers can pre-condition the XC90 T8’s drivetrain, battery and cabin, either directly from within the car or by using the Volvo On Call mobile app. This ensures that, whether it’s freezing or hot and humid outside, the car will be heated or cooled as necessary and ready to go by the time the driver enters. Pre-conditioning can be done while the car is plugged in, which is beneficial from a CO2 perspective since it ensures that the battery will last as long as possible in Pure Electric Drive mode.

A heritage of innovation

As the world’s most powerful and cleanest SUV, the XC90 T8 joins a long list of Volvo Cars innovations designed to create a more comfortable driving experience, a cleaner environment and safer roads.

The data in the press release is based on the NEDC certification cycle used in the EU. The figures are preliminary. 

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