Trucks are the core value! Brief comment on Volvo's three major engine technologies

When it comes to luxury brands, we first think of Mercedes-Benz, BMW and Audi. The sales volume and influence of these three brands in China market are obvious to all, and they are the "top three" properly, but if we look at the international market, I'm afraid the situation is not so absolute.

At present, among the second-tier luxury brands in China, Volvo has been widely recognized by consumers for its outstanding performance in safety, economy and cost performance. But when it comes to the core technology of the engine, many people will feel that "holding a 2.0T four-cylinder engine for thousands of years has no future." This idea is undoubtedly one-sided, and it is also the core factor that Volvo is seriously underestimated in China.

●2.0T？ Drive-E？ T6

▲ Core selling point: mechanical+turbo double pressurization

▲ Related models: Volvo XC90, Polestar.

Volvo sports car -Polestar? 1

Drive-E？ According to different adjustments, the maximum power output of 2.0T inline four-cylinder turbocharged gasoline engine can be between 140 HP and 306 HP. As a high-power version of pure fuel, T6 engine adopts the idea of turbo+mechanical double pressurization in hardware to replace the previous inline five-cylinder and inline six-cylinder engines.

The advantage of mechanical supercharging is rapid response and no hysteresis, and the advantage of turbocharging is high-speed performance, which will not dilute the engine power output. These two series connections can be complementary. At low speed, mechanical supercharging is used to ensure the low torque output of the engine, while at high speed, the energy of high-speed exhaust gas can be fully utilized to improve supercharging efficiency and further squeeze the dynamic performance.

In terms of parameters, this 2.0T? The T6 engine has a maximum power of 306 HP and a peak torque of 400 Nm. Compared with the turbocharged engine with the same displacement, whether it is double scroll or single scroll, whether it is in-cylinder direct injection or manifold+direct injection, it has obvious advantages. Take XC90 as an example. If compared with BMW X5 and Mercedes-Benz GLE, is it really only 3.0T? L6 or 3.0T? V6 can achieve such power output.

Mercedes-Benz inline 6-cylinder engine

Of course, a small displacement is always a small displacement, and a four-cylinder engine is always a four-cylinder engine. Although the book data is equivalent to V6 and L6 engines, XC90 is worse than BMW X5 and Mercedes-Benz GLE in ride comfort and NVH. It's a little dynamic when you step on the accelerator deeply, and it's not so easy to pull a car with a weight of nearly 2 t.

●2.0T？ Drive-E？ T8

▲ Core selling point: dual-motor plug-in, electric four-wheel drive

▲ Involved models: Volvo XC90 new energy, S90 new energy.

XC90？ T8 interpolation

The power system of Volvo XC90 hybrid vehicle consists of a 2.0-liter dual-supercharged gasoline engine (T6 engine) and an electric motor with a power of 65 kW (88 HP). The maximum power of the system is 298 kW (406 HP) and the maximum torque is 640 Nm. In pure electric mode, XC90? The T8 is only driven by the rear axle motor, and the lithium battery pack is located in the center of the chassis, with a pure electric cruising range of 40 kilometers.

In the hybrid mode, the engine and the rear axle motor are driven at the same time to realize electric four-wheel drive. Compared with the traditional four-wheel drive, its biggest advantage is that it has no central transmission shaft, higher working efficiency and faster response speed. Of course, without the transmission shaft, there would be no differential, and there would be no torque distribution between the front and rear axles, while the traditional four-wheel drive, such as BMW X-drive, could transfer 100% of the power to the rear wheels.

Plug-in and hybrid electric vehicles must have the functions of charging and energy recovery, mainly through the generator integrated between the engine and the transmission, and can also "guest start" the motor function. According to official sources, Volvo will further strengthen the T8 plug-in system on the XC90, which will be launched in the mid-term. A driving motor is added to the front axle, which is connected with the engine crankshaft through belt transmission, and can directly drive the front axle.

● 13L？ D 13TC diesel engine

▲ Core selling point: compound turbocharging, wavy piston.

▲ Related models: FH series trucks

As we all know, trucks are the "soul" of Volvo. Today's protagonist is this brand-new D/KOOC-0/3TC diesel engine released in 20/KOOC-0/9, with a displacement of/KOOC-0/3L and a six-cylinder layout, which is no different from the previous D/KOOC-0/3. In fact, after technological innovation, the fuel efficiency of D 13TC has increased by 3%, saving fuel 1 1% compared with the same period last year.

First of all, D 13TC adopts the wavy piston design with "wide brain opening", which can further optimize the tumble flow in the cylinder and make the diesel fuel burn more fully compared with the traditional piston. At the same time, the air compression ratio in the cylinder will be increased from 17: 1 to 18: 1, and the smoke in the cylinder will be reduced. In terms of parameters, its high-power version has a maximum power of 500 HP and a peak torque of 2800 Nm, which has obvious advantages in the same displacement, especially the burst torque.

How to use exhaust energy has always been an important topic for internal combustion engines. Traditional turbocharging restored the engine's high heat and high speed exhaust to a certain extent, while Volvo's D 13TC went further and adopted a set of turbocharging. Composite mechanical heat recovery system. When the exhaust gas passes through the exhaust gas turbine, it can not only drive the intake turbine to increase the intake pressure (turbocharging part), but also directly integrate the kinetic energy of the exhaust gas turbine into the crankshaft through a set of gear sets, thus improving the power output.

According to the official, with the blessing of this "TC system", the engine can get an extra torque output of 300 Nm, which is also the core factor of its higher peak torque compared with the same displacement.

● Summary:

Obviously, Volvo has never lacked hard-core technology, and it is not afraid of "BBA" at all. In the field of passenger cars, although the Drive-E series is limited by the displacement and the number of cylinders, its influence is not as good as that of the L6, V6 and V8 engines of Mercedes-Benz BMW. However, thanks to the application of the dual-supercharging system, its power experience has not held up the whole vehicle, and its cost-effective advantage is also very obvious. In the field of trucks, the patented technology of compound turbine and wavy piston demonstrated by this D 13TC diesel engine is only the tip of the iceberg. Volvo trucks are the best of their kind in technology application, safety and reliability, power experience and so on.

This article comes from car home, the author of the car manufacturer, and does not represent car home's position.