The power exceeds the BMW B48 high-power version, what is the "inside show" of SAIC's third-generation blue core 2.0T engine?

steam chat 2022-09-23 10:35:57 阅读数:707

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At the same time that the MG7 black-label coupe was launched, it also brought SAIC's third-generation Blue Core 2.0T high-performance black-label engine.This engine is also a product created by SAIC's completely independent technology, which can output a maximum power of 192kW and a maximum torque of 405N m.For reference, the high-power B48 engine on the BMW 330Li also has only 190kW and 400N m torque.The SAIC blue core engine has been jointly developed with GM from the first generation engine to the completely independent research and development of the third generation engine, which has also witnessed the evolution and development history of China's automobile internal combustion engine.

From a technical point of view, this engine does have a lot of technological content, using VGT variable section turbocharger, DVVL intelligent variable valve lift, 350bar high pressure direct injection system and many other core technologies.This also represents the first-line strength of Chinese auto brands at the 2.0T level.

01

Running texture is the focus of improvement

In fact, for the newer generation 2.0T engine, the improvement of power and energy efficiency is on the one hand, and the other is to improve the smoothness and sense of luxury of the engine.For example, the VGT variable-section turbocharging technology is like this, through the change of the internal blades of the turbine, so as to realize the switching between the large turbo and the small turbo.It's also a very effective technique for counteracting turbo lag. Porsche's 911 models, for example, have similar engine technology.

In the case of low exhaust flow at low speed, the nozzle ring controls the airflow through the section, thereby increasing the intake pressure and improving the inherent characteristics of traditional superchargersThe response lag defect, the speed to reach peak torque is only 1750rpm, and the time is also shortened by 30%.So this technology can very well eliminate the turbo lag felt by the driver and make the engine smoother.

Another thing worth mentioning is the DVVL intelligent variable valve lift technology.Under low-speed and low-load conditions, the low-lift control is used instead of the throttle control, the throttling loss at the throttle is reduced, the intake pressure increases, the in-cylinder pressure is higher, the work consumed in the ventilation process is less, and the pumping loss isLower, reduce fuel consumption.

The high lift state can increase the intake air volume, effectively improving the instantaneous response of the engine, and the response time at 2000rpm is increased by 28%.The comprehensive and precise calibration control strategy improves fuel economy by 5% and power by 3%.This is a very strong jump for this 2.0T engine.For the current engine, the response time is the focus of this improvement compared to the improvement in fuel economy and performance.Because it represents the driving quality that the driver can feel.

02

Ensure stability under extreme conditions

In addition to the texture of the engine running, the state under extreme conditions is another key.For this engine of SAIC, it represents the new needs of SAIC passenger cars in the new era, and it must be a benchmark for joint venture brands.Therefore, in addition to the silky texture, the stability under extreme working conditions is also very important.

For example, it is equipped with a low temperature prevention system, which can optimize the structure of the respiratory system in a low temperature environment, and comprehensively study the mechanism of gas temperature drop in the breathing circuit to ensure that theNo risk of breathing system icing and optimized fuel dilution levels to a minimum.

And it also adopts an integrated exhaust manifold, which greatly shortens the length of the exhaust system, realizes internal EGR, and reduces exhaust heat dissipation during cold start, speed up catalytic converter light-off, improve emissions.During cold start, the exhaust gas is used to heat the cooling water to shorten the engine warm-up time.At high load, the exhaust gas temperature is reduced by the coolant, which reduces the heat load of the supercharger.Reduce the number of engine exhaust system parts and achieve a compact and lightweight design.

In extreme sports conditions, this engine is also designed to maintain high temperature and plateau performance.Conduct a comprehensive study of the ambient temperature distribution in the front cabin and optimize the arrangement of the intake piping.In urban congestion conditions, the intake air temperature drops by 12% at high temperatures, thereby improving the power performance of the vehicle at high temperatures.

In general, this is a first-line engine in the independent brand camp.Judging from the book data, in fact, the domestic 2.0T engine did not lose to the joint venture brand in the early years, even Mercedes-Benz BMW.Therefore, it can be seen that SAIC's third-generation 2.0T engine has greatly improved its texture and quality.Let the driver feel the quality of the vehicle more smoothly and smoothly, which is also the focus of our own brand in the future.

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