On the original Audi Q7, Audi chose to launch a deity model-Audi Q7? V 12？ TDI, this model is simply the flagship of the flagship, sweeping BMW X5 and Mercedes-Benz GLE in the same period with strong strength.
In Audi's product lines of past dynasties, Audi basically launched a model that demonstrated its technology and strength in the whole product cycle. In the history of Audi Q7, 6.0 liters V 12? Audi Q7 with TDI diesel engine? V 12？ There is no doubt that TDI mode exists in this way. At the same time, it is with this model that the old Audi Q7 has raised the height of the old Audi Q7 in the eyes of consumers by several levels.
Perhaps, when the early Audi Q7 was so dazzling, it was always difficult to catch up with the Audi Q7, which made consumers look forward to it again and again, but they were disappointed again and again in the release of the new Audi Q7.
Audi took out such a 6.0-liter V 12? Audi Q7 equipped with TDI diesel engine did not show its muscles to the world on a whim, but because Audi won the sixth championship of its own team at Le Mans circuit in 2006 with an Audi R 10 equipped with V 12 diesel engine. At that time, Audi became famous in Le Mans, and it became more and more brave, and it had a high voice on the track and in the market. With such a prominent reputation, Audi hopes to give fans a chance to win the Le Mans championship, and at the same time, Audi also wants to seek some practical returns in the market.
Therefore, in 2006, Audi began to build a 6.0-liter V 12, a civilian version, based on the V 12 diesel engine on the Audi R 10 model, on the premise of prestige, achievements, technology and manpower. TDI engine (this engine is also the first diesel engine with V 12 cylinder on passenger cars. Later, Volkswagen Group introduced the 5.0L version of V 10 on this basis. TDI diesel engine, and applied to the Touareg R50, staged a feat of pulling Boeing 747) and put it on its own Audi Q7.
Since this engine comes from the champion model of Audi R 10, it must be excellent in durability, fuel economy and power. Although it is not the champion heart of Audi R 10, it has excellent parameters in all aspects on this civil engine.
In terms of power parameters, this 6.0-liter V 12? TDI engine can still produce the maximum power of 368kW(500PS)/4000rpm and the peak torque of1000 N m/1750 ~ 3000 rpm. Equipped with a 6-speed Tiptronic gearbox, the transmission system adopts a set of Quattro mechanical four-wheel drive system with very high specifications. Power machinery as a whole, Audi QT can
In terms of power performance and fuel consumption, even a full-size SUV equipped with a 6.0L V 12 turbocharged engine can control the fuel consumption to 100 kilometers 1 1.9L diesel, which meets the Euro V standard after 20 10 years.
Going back to the technical level of this engine, although the racing version of the engine had been mounted on Audi R 10 before Audi developed the civilian version, it experienced a very severe test in the 24 hours of Le Mans, but Audi manufacturers still made some changes to the engine itself.
Audi 6.0 liter V 12? TDI engine is made of a new type of cast iron named GJV-450, which has a hardness 40% higher than that of gray cast iron and a metal fatigue resistance 40% higher. % and 100? %, less than the weight of gray cast iron 15? In addition, GJV-450 new cast iron has better thermal conductivity. It is precisely because of its superior characteristics that Audi can make this V 12 engine more compact and add more whimsical elements.
The first one is in this V 12? In the layout of TDI engine, a V-shaped 60-degree included angle is adopted, and the cylinder spacing is only 90 mm As a diesel engine, long stroke must be adopted. However, in order not to sacrifice speed and maximum power output, engineers finally set the stroke to 9 1.4mm and the cylinder diameter to 83 mm This cylinder layout can effectively reduce the engine's running inertia, thus improving the response speed and engine output.
On the engine crankshaft piston connecting rod three-piece sleeve, the crankshaft is made of Cr-Mo alloy steel, and the main bearing seat is reinforced with cast iron. The connecting rod and piston are made of aluminum to reduce the moment of inertia, and at the same time, they can be made lighter.
On the fuel supply system, Audi has equipped this engine with Bosch Piezo piezoelectric diesel injection system, the injection pressure is as high as 2000bar, and eight injection holes can ensure the diesel injection effect and atomization degree under various working conditions. One of the reasons why the piezoelectric diesel injection system is favored by engineers is its sensitive response speed, and the injector can be turned on and off within a few milliseconds after receiving the instruction. The biggest difference with ordinary fuel injectors is that the valve needle of piezoelectric fuel injectors is no longer a mechanical device, so the opening and closing time is shorter than that of ordinary fuel injectors, and at most five injection actions can be realized in one working cycle.
The crankshaft directly drives the oil pump and two high-pressure diesel pumps of the common rail fuel injection system through the chain, and cooperates with the Bosch piezoelectric injector to realize the high-precision injection effect of fuel injection, and the injection is uniform and fast, which lays a solid foundation for reducing the noise, emission and fuel consumption of the diesel engine and improving the combustion effect and performance of the engine.
The piston and cylinder head with special shapes can improve the compression ratio of the combustion chamber of the engine to 16, and through aerodynamic design, the combustion chamber can even form a special vortex according to the airflow at each intake, which helps the formation of mixed gas and makes the fuel mix more fully.
At the beginning of this engine production, Audi not only wanted to win a sigh of relief in the passenger car market, but also wanted to build a high-power diesel engine that could beat gasoline engines.
Therefore, when building the engine, we choose to equip this engine with double geometry variable turbines, which are arranged on both sides of the engine, and the maximum pressurization value can reach 1.3bar. One geometry variable turbine is responsible for providing enough fresh air for a row of cylinders, and the sensitive turbine control system can meet the low torque output. Although it is almost impossible for a large-displacement turbocharged diesel engine to have low torque shortage; You can also run at will when you need power. This setting allows the engine to have a long enough torque range and a very high output upper limit.
On the exhaust system, Audi V 12? TDII is equipped with a double-layer cross-flow exhaust pipe, and each exhaust pipe is equipped with a particle filter device, which can effectively reduce the emission of soot particles produced after diesel combustion; In addition, the EGR exhaust gas circulation system of this engine is about 50? % exhaust gas will re-enter the intake pipe for re-combustion, which can greatly reduce the generation of nitrogen oxides and further improve the fuel economy and emission energy consumption of this V 12 diesel engine. This engine is assembled on Audi Q7, and the emission standard can fully meet the Euro V standard implemented in 20 10.
For 40 years, Audi has been a leader in the field of high-performance diesel engines. It has won many championships in Le Mans with its high-performance and high-reliability engines, writing a new chapter in the history of diesel engines. Audi decided to assemble this engine through the Hungarian factory, which excited many fans at that time, because this engine can be said to have completely changed the status of high-performance engines in the passenger car field, and gasoline engines have always been dominant.
With the appearance of this engine, Audi saw that many fans of diesel engines had a high voice for this high-performance and large-displacement diesel engine, and even had plans to quit the 6.0L at one time? V 12？ TDI version of Audi R8 and Audi A8, but later it was abandoned for some objective reasons.
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