"As a high-end brand and strategic brand under Chery, Xingtu is the master of Chery’s technology, the pioneer of Chery’s technology, and the breakthrough of Chery’s upward trend. It is responsible for leading Chery, accelerating change, and making upward breakthroughs. It is an important mission to fully embrace the era of green and intelligent vehicles. Xingtu Lanyue is based on the 24-year research and development accumulation of the Chery brand, as well as the world’s five R & D centers and the top 500 supplier system, and the flagship product of Xingtu for the’new era elite ‘on the M3X Mars architecture."
I still remember at the launch conference of Xingtu Lanyue on March 18, Gao Xinhua, deputy general manager of Chery Automobile joint stock company, general manager of Xingtu brand, and director of the General Institute of Automotive Engineering Technology Research and Development, conveyed the responsibility and significance of Xingtu Lanyue as a flagship model. Since it represents the highest level of vehicle construction of Chery Group, how should Xingtu Lanyue interpret the label of "Technology Chery"? On April 8, six engineers of Xingtu "Star Nuclear Power Celestial Group" shared with us the "black technology" of Xingtu Lanyue Star nuclear power 2.0TGDI engine technology through online technical communication. Let’s find out together.
Four core advantages: strength, lightness, quietness, and purity
As the market can see, turbines are currently rampant on the market, and the 2.0T engine occupies the mainstream position in the mid-to-high-end models of independent brands and joint venture brands. Chen Weiguo, a Xingtu performance development engineer, said that in order to stand out in the market competition of strong players, the flagship engine of Xingtu must have eye-catching performance parameters.
The Star Nuclear-powered 2.0TGDI engine mounted on the Xingtu Lanyue has a maximum power of 187 kilowatts (254 horsepower) and a maximum torque of 390 Nm. Its power reserve has reached the traditional V6 3.5L large displacement level.With the cooperation of VVT mid-mounted technology and electronically controlled supercharger, the car’s nearly 5-meter-long Lanyue can accelerate 100 kilometers to 8 seconds, so its power level can be regarded as absolutely abundant, and it is also a leader among competitors of the same level.
Chen Weiguo introduced, "In terms of engine lightweight, our lightweight aluminum alloy material accounts for more than 38% of the total weight of the engine, making the total weight of the Star Nuclear Power 2.0TGDI engine only 137.5 kilograms, making it the’lightest engine in the 2.0T automotive market ‘.He said. At the same time, by taking the lead in adopting a number of black technologies such as the Miller cycle, low-resistance motion system, and 350Bar ultra-high pressure direct injection system, and completing three major inheritances and two major innovations on the basis of the first-generation intelligent combustion system, it has truly realized "can run fast and eat less".
The author noticed that in addition to the fact that "aluminum alloy materials account for more than 38% of the total weight of the engine", Chen Weiguo also mentioned another "38%": "The maximum thermal efficiency is actually the lowest specific fuel consumption value of the engine, which only represents the lowest point in many engine fuel consumption data.And we chose 38% gold thermal efficiency and provided 93.5 kilowatts of maximum power, achieving a balance between fuel consumption and power, leading the class. "
According to him, the engine as an organic whole, the maximum thermal efficiency and maximum power are engine performance indicators, both of which are indispensable. For traditional power passenger cars, the high thermal efficiency of the engine only represents a point, not a face. And the daily use of the vehicle only covers the medium and low loads of the engine operating conditions, so the main optimization work of this star nuclear power 2.0TGDI engine is reflected in the medium and low loads of the engine. With a high compression ratio of up to 1:10.2, Miller cycle technology is adopted to ensure the intake air volume while shortening the intake time and reducing the pump air loss in urban driving conditions. In high-speed driving conditions, by closing the intake valve in advance, the combustion temperature is reduced, the combustion efficiency is improved, and the fuel economy is greatly improved.
We know that Xingtu Lanyue is positioned as a "concierge-class seven-seat SUV". In order to be worthy of this title, Xingtu’s R & D team has also made many optimizations in quietness. According to Lan Jun, NVH engineer of Starcore Engine, through the application of a variety of advanced NVH technologies, including dual balance shaft system, CPA dual mass flywheel system, bending and torsion shock absorber, silent timing chain system, and silent generator assembly, the NVH performance of Starcore 2.0TGDI engine is at an industry-leading level. Among them, the engine idling speed of 1 meter sound pressure level is only 61.8 decibels, and the engine suspension vibration of the whole vehicle under lifting conditions is only 0.49 grams.Ultimately, the NVH quality of the Starcore 2.0TGDI engine has reached the international first-class level, the engine idle sound pressure level is as low as 61.8 dBA, and the sound pressure level in the car is as low as 39 dBA, truly achieving a "library-level" quiet cockpit.
At the same time, environmental protection is the theme of the current era. Liu Yike, an engineer of Xingtu combustion system, introduced that in order to meet the national energy conservation and emission reduction requirements, the Star Nuclear Power 2.0TGDI engine is equipped with the second-generation intelligent combustion system, which has completed the "three major inheritances, two major innovations". The second-generation intelligent combustion system inherits the fish belly type intake port, Masking combustion chamber, and airflow guiding spray. At the same time, the cylinder bore stroke ratio is optimized to 1.22, making it a long-stroke combustion architecture.The in-cylinder tumble ratio can be increased by 30% and the combustion speed can be increased by 20%, which is comparable to the level of TNGA architecture. The 350bar ultra-high pressure direct injection system can use more than 3 injection strategies, so that the average diameter of the fuel particles after atomization is only 8 microns, which is equivalent to 1/6 of the diameter of the hair, which greatly improves the fuel atomization effect and gas mixing effect, so that the fuel burns more fully.Reduce particulate emissions by 90% and HC emissions by 40%, eliminating particulate emissions at the source.
Chery ACTECO third generation refined products
Recently, Xingtu Lanyue launched the promise of "the first owner’s engine lifelong quality assurance" and formulated corresponding service policies. In this regard, Xingtu believes that it is the extremely reliable quality that gives it the confidence to make such marketing measures.
According to reports, relying on Chery’s 24-year mature forward R & D system and mature technical strength, Xingtu has an engine laboratory, a semi-muffler laboratory, an airway laboratory, an optical laboratory, a constant temperature laboratory and a low temperature laboratory, etc., and undertakes the combustion verification, durability, reliability, power and other tests of various models, and has been operating at full capacity for a long time. At the same time, it always follows the "V-shaped forward R & D system", is guided by market demand, and conducts targeted development according to different driving habits, so that the goal comes from the market and eventually returns to the market.
At the same time, Xingtu took the lead in building a world-class supplier system with international leading level and strictly controlled the quality. During the engine development and verification process, every engine delivered to the user will be tempered by a rigorous five-level development verification system, and the bench verification is greater than 20,000 hours. From extreme cold to extreme heat, from plains to plateaus, the vehicle environmental adaptation development footprint is all over the world in extreme environments, and the vehicle durability and reliability verification is greater than 2 million kilometers. Finally, according to the end point market and after-sales department research data, the failure rate of Xingtu’s moon engine can be achieved only 0.38 within 3 months of normal use after lifting the car, exceeding the mainstream joint venture level.
Chen Weiguo revealed to Buycar, a car buying network, that Xingtu currently has 1.6TGDI and 2.0TGDI already on the market, as well as a hybrid multi-power combination planned in the future. This time, the Xingtu brand is the first model to carry the 2.0TGDI engine, and there will be a low-power version to carry the Chery brand in the future.
"The market is the only criterion for testing product quality. The ACTECO 1.6TGDI engine has been unanimously recognized at the customer end point in terms of performance, NVH and reliability, and the Star Nuclear Power 2.0TGDI engine, as the third-generation product of Chery ACTECO, will be better than the 1.6TGDI. So we also believe that the performance, NVH and reliability of the Star Nuclear Power 2.0TGDI will be unanimously praised by the market again," Chen Weiguo said.
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