The world's top power system research and development enterprise, BYD's good partner.
He is the "founder of Dharma" in the world's engine rivers and lakes and a leader in the engine industry.
AVL Liszt was founded in 1948, and its founder, Professor Liszt Lao, once taught at Tongji University, an old friend of China. Today, AVL· Liszt has developed into one of the three authoritative R&D internal combustion engine companies in the world, with 45 subsidiaries. He has high attainments in power system design, R&D, internal combustion engine noise reduction, test system and equipment development. Nowadays, with the development of new energy vehicles, AVL Liszt has also expanded its business to the research and development and testing of power systems in the whole industry. You know BMW, Mercedes-Benz, Audi, Volvo and Jaguar Land Rover are all partners of AVL Liszt.
In China, AVL· Liszt certainly has partners. BYD has always insisted on cooperating with world-class suppliers to achieve a strong alliance. In BYD's spare parts supplier list, there is a long list of world-class suppliers, such as Bosch, Faurecia, Haakinson, NEXT, ZF Trina Solar, Kubo and Dirac, among which AVL· Liszt is one.
AVL Liszt helped BYD Tang become a "silent master"
BYD and AVL Liszt joined hands to continuously optimize the noise of their power plants, and Qi Li created BYD Tang, whose NVH far exceeded that of peers. It should be noted that when it comes to noise reduction, a high-end model with luxury technology not only reduces wind noise and road noise, but also reduces engine noise.
BYD Tang Fuel and Tang DM both use 2.0TI turbocharged engines. For engine noise reduction in the industry, the conventional means are usually to improve the manufacturing accuracy of moving parts and reduce friction noise; Optimize engine damping design to reduce vibration; In addition, by adding sound insulation materials to the front fender, firewall and cockpit, the engine noise introduced into the cockpit is reduced. In addition to doing this, BYD Tang has a deeper means of noise reduction.
Byd Tang optimized the structure of oil pan, cylinder block, intake manifold and cylinder head cover, and added sound insulation covers to high-pressure oil pump, oil pipe and oil rail, which reduced the structural noise and radiation noise of the whole machine. Aiming at the turbocharger of 2.0TI engine, Liszt AVL optimized the intake system and eliminated the gas vortex noise. At the same time, the calibration software is optimized to effectively eliminate the air leakage sound of the supercharger; Finally, the phase of the four-way cam of the high-pressure oil pump is optimized and adjusted, which effectively reduces the noise of the engine.
Sounds too professional? Never mind, let's see what simple and clear practical effects these means will produce. Taking Tang DM as an example, it can be seen from the above figure that the idle noise is reduced by 5.0dB, and the acceleration noise is reduced by 2.0 ~ 5.0 dB. This is equivalent to two mosquitoes buzzing in your ear disappearing in a quiet night. Before noise optimization, the noise value of Tang DM is within the blue industry average, which seems to belong to the upstream. After optimization, Tang DM is better than the industry average.
Tang DM
In addition, Liszt also has noise reduction methods for the hybrid and pure electric systems used by Tang New Energy. Aiming at the hybrid power system, the vibration and noise of the engine at high speed and low speed can be avoided by accurately coordinating the complementary advantages of the engine and the motor and working together with the timely participation of the motor.
Tang EV
On the motor side, BYD cooperated with AVL Liszt to improve the motor control accuracy and reduce the motor rotation error through professional motor rotor gradient optimization technology, thus reducing the vibration and noise of the power system. This kind of noise reduction for motors is just what many ordinary brands have no time to take care of. Even BMW i3 and i8, the pioneers of luxury electric vehicles, are not as thorough in motor noise reduction as today's Tang DM and EV, so that many users have to endure the discomfort of buzzing ears when driving i3.
Therefore, BYD walks on the road, even if the acceleration of 100 kilometers reaches an astonishing 4.3 seconds, it is always "quiet" inside and outside the car. ?
BYD Tang not only has Liszt to provide power system noise optimization, but also Siemens to provide vehicle NVH performance optimization. Through reasonable topology analysis, the assembly process structure is optimized, sound-absorbing and vibration-isolating materials and patches are added for sound insulation and fine sealing, and cavity blocking technology is adopted to effectively block full-speed noise, so as to achieve the quietness comparable to that of top executive cars. The Mobile Listening Room belongs to the Tang Dynasty, which brings users a higher level of enjoyment.
This article comes from car home, the author of the car manufacturer, and does not represent car home's position.