Unique Valve Lift Land Rover Yingli 2.0T Engine

　　[car home Engine Analysis] Since Jaguar Land Rover launched the Ingenium Yingli engine independently developed in 2015, this model has become one of the main power sources of Jaguar Land Rover’s fuel vehicles, and three modular product series engines, namely gasoline/diesel, inline 3-cylinder, inline 4-cylinder and inline 6-cylinder, have been derived from it. With the Avionics engine entering the sixth year after its launch, the increasingly stringent environmental protection requirements have prompted Jaguar Land Rover to continuously improve this engine. Today, an improved model (code name AJ20) equipped with 48V micro-mixing system and electronically controlled hydraulic valve lift technology has come to us.

● The 2.0t four-cylinder machine is still the main specification, and the power parameters of the high-power version machine are slightly improved.

　　The launch of the Yingjieli engine means that Jaguar Land Rover brand can finally abandon the power sources that originated from Ford and BMW. Based on the single-cylinder "500mL" concept and modular design, there are several different displacement versions of the Yingjili engine. At present, the domestic version is a 2.0T four-cylinder gasoline version, but it is reported that the 1.5T three-cylinder version will be introduced in the future and will be produced in line with the four-cylinder engine.

　　Although many new technologies have been added, it is found that there is not much difference in power parameters between the sports version and the Shenxing version. The parameters of the low-power version are basically the same, and the maximum power and peak torque of the high-power version are slightly increased by 8Ps and 25 N m. As for the specific performance of the new car? We also tested it not long ago. For details, please clickBrand-new experience test Land Rover Discovery Sport 249PSLearn more.

● The cylinder body is made of all-aluminum material, and the surface is covered with silent heat preservation material.

　　At present, Yingjieli engine still follows the concept of "500mL" single cylinder, and the displacement of each cylinder is 0.5L, which is the same as that of BMW. The main parts of the engine, including the cylinder head, cylinder block and oil pan, are all made of aluminum, which is the same as before. But the difference is that in order to achieve better noise reduction and heat preservation functions, a large area of soft sound insulation material is added to the cylinder surface to improve NVH effect.

　　The piston connecting rod is made by expanding and breaking technology, that is, the connecting rod body and the tile cover are originally a whole, and then the two parts are forcibly pulled apart by machinery after processing. The advantage of this technology is that the cross sections of the connecting rod and the tile cover are one-to-one correspondence, and the combination is very tight after recombination, and the transverse shear force is also strong. In addition, the piston rod part has been strengthened to cope with the higher load of the engine.

　　Compared with Shenxing, the air intake system is also different. It is found that the sports version integrates the air intake on the hood. Although the position is higher, according to official data, its wading depth is still 600mm as Shenxing.

● Exhaust manifold and double scroll single turbocharger integrated in the cylinder head.

　　The cylinder head is mainly made of aluminum alloy. The technology worth mentioning is the integrated exhaust manifold design. The advantage of the integrated design is that the engine can use the high exhaust temperature to achieve better heat exchange, with the characteristics of high warm-up speed, timely arrival of warm air in winter, and optimized exhaust. This technology is also adopted by many OEMs.

　　The exhaust manifold is integrated in the cylinder head, which has the advantage of compact structure, and the water temperature rises rapidly after cold start. Nowadays, many engines adopt the same design concept. The exhaust manifold on the cylinder head has two outlets, which are used to match the double scroll single turbocharger. The two exhaust scrolls are independent of each other, and the exhaust pulses do not interfere with each other, thus achieving better exhaust efficiency and improving the intake situation.

●　The 48V generator at P0 position can improve NVH performance and fuel economy.

　　The 48V light mixing system is one of the biggest changes of the new machine. The all-in-one generator is installed in the position of the original starter, providing extra power through the belt. Compared with the traditional automatic start-stop, the 48V system can provide additional torque assistance under the conditions of high fuel consumption such as static start, and also has the advantages of fast starting speed and good starting smoothness. The upgrade cost of the whole system is much cheaper than that of many hybrid power systems (such as Toyota THS and Honda i-MMD).

　　Compared with the traditional hybrid power system, the 48V system has limited fuel-saving ability, but compared with the pure fuel version engine, it still has certain energy-saving potential, especially under some extremely low load conditions, the engine can be stopped for a short time, thus reducing fuel consumption.

● The continuously variable valve lift controlled by electromagnetic oil pressure is one of the highlights of the new machine.

　　The intake and exhaust sides of Yingli engine are equipped with valve timing system, and the purpose of adjusting the intake and exhaust timing is realized by adjusting the phase of sprocket with the solenoid valve at one end of camshaft. The principle of the timing system is basically the same as that of other brands of engines. By adjusting the valve phase, the intake demand of the engine under different working conditions can be met, and the dynamic response at low speed and the combustion efficiency at high speed can be improved.

　　The continuously variable valve lift system is a highlight of the new model. The system is set on the intake side, and the hydraulic pump is controlled by solenoid valve to adjust the length of valve tappet, so as to realize the purpose of adjusting valve lift. The valve lift of the intake side is stepless adjustment, and the lift range is between 0-11 mm.

　　As for the fuel injection system, Yingjieli engine adopts high-pressure common rail fuel injection system. At present, the fuel injection pressure of AJ20 engine is 200bar, and the fuel injection pressure of AJ21 engine in the future will be further increased. The piston side is coated with a dark anti-wear coating, and the labyrinth oil-gas separator is located at the top of the cylinder head. These are the anti-friction and separation forms that many mainstream models will adopt.

　　Considering that the national VI emission standard also puts forward restrictions on particulate emissions, in order to meet the standard, it is found that the Sports Edition has made changes in tail gas treatment and added a particulate collection device at the back of the three-way catalytic converter. However, with the increase of mileage, the particulate matter in the collection device is blocked, so it is found that the sports version also has a pressure sensor on the device. Once the risk of blockage is detected, the system will automatically increase the engine speed to burn these blockages.

Low article summary:

　　It is found that the power system of the sports version integrates many new technologies, such as 48V light mixing system, valve lift technology of electromagnetic oil pressure adjustment, sound insulation and vibration isolation foam material on the cylinder block, and particle collection device on the exhaust gas treatment system, which are all technical highlights worth mentioning on the new machine and are at the leading level in scientific and technological content. Among them, the valve lift technology controlled by electromagnetic oil pressure is a major feature. At present, this technology is still very rare in domestic engines. The stepless adjustment of intake valve lift with timing system can more accurately meet the detailed requirements of the engine for power and torque under different working conditions.

　　The 48V light mixing system is also a technical highlight of the sports version, which can be seen in many other brands, especially in mid-to high-end models. Although the 48V system can’t drive the vehicle independently for a long time like the hybrid system of Toyota or Honda, and the fuel saving effect is not so obvious, compared with the traditional fuel engine, the addition of the light hybrid system can improve the starting speed and ride comfort, and the NVH performance is also better, which is an effective supplement to the traditional engine. For the Discovery Sports Edition, its changes compared with the Discovery Spirit are not limited to this, and its chassis structure is also worth seeing. Please look forward to analyzing the Discovery Sports Edition: Chassis! (Text/photo/photo by car home Zhu Lishen)

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