In BMW's automobile production history of nearly a hundred years, the development of automobile power unit has experienced the development from naturally aspirated engine to turbocharged engine, and then to hybrid power system. BMW has always had a soft spot for the inline six-cylinder engine, and its inline six-cylinder engine has always been well received by the market.
In the past decade, BMW has made great progress in the field of turbocharging, from N54 series engines to N55 engines, and then to B48 and B58 engines. Each model represents the latest research and development achievements of BMW in the field of turbocharging technology.
The in-line six-cylinder turbocharged engine currently used by BMW has been very competitive in the market, and it has done very well in many aspects such as power performance, fuel economy and emission efficiency. In order to dig the performance of the inline six-cylinder engine more thoroughly, I choose to upgrade my powertrain with various technologies.
Recently, as an old supplier of technical solutions, Borgwarner confirmed that its dual-channel turbocharger has been carried by BMW on its in-line six-cylinder engine.
After Borgwarner's new dual-channel turbocharger kit is adapted to BMW's 3.0L inline six-cylinder gasoline engine, BMW's new engine is expected to provide two engine versions with different power outputs: 250kW, 500n·m and 280kW, 550n·m, which will be widely used in BMW's 3-series, 5-series, 7-series, X5, Z4 and other passenger cars currently on sale.
BMW has always been keen to attribute all kinds of high-tech technologies to its own production models, and the development of powertrain is even more radical. In the field of turbocharging, the technologies adopted by various manufacturers are endless, and the dual-channel turbocharging technology provided by Borgwarner this time can produce similar effects to the dual-turbine technology, and at the same time, because of its smaller size, it can reduce weight and cost, so it is gradually favored by various automobile manufacturers.
This brand-new technology is based on Joe, President and General Manager of Borgwarner Thermal Management and Turbine Systems. Fador said: "Borgwarner cooperated with BMW to develop and deliver this latest design. Advanced high-temperature resistant alloy and casting technology enable customers to develop low-emission engines with the advantages of comfortable driving, excellent performance and low-speed agile response. With the completion of this project, it is expected that a large number of BMW passenger cars will be equipped with Borgwarner turbochargers. "
Compared with the common single-channel turbocharger, the biggest difference of the dual-channel turbocharger is that it replaces the original single large-diameter pipeline with two small-diameter pipelines, which can reduce the exhaust interference of the engine, optimize the supercharging system of the engine and improve the supercharging performance.
When the engine is idling or at low power output, the exhaust airflow of the engine is not strong, so a single large-diameter pipeline will be in a state of insufficient pressure, which is not enough to drive the turbine, thus causing extremely serious hysteresis;
For a dual-channel turbocharger, it is different. When the engine is equipped with two channels, when the engine is idling or at low power output, it only needs to open one channel to let the airflow pass, and at the same time, it can generate higher exhaust pressure and quickly push the turbine; When the engine is at high speed or high power output, once a single flow passage cannot meet the engine's supercharging demand, ECU will control the valve of another flow passage to improve the supercharging efficiency of the engine, which is equivalent to the output of a large-diameter single flow passage to meet the engine's high-performance output demand.
Each flow passage of the dual-channel turbocharger provided by Borgwarner for BMW can be used by three cylinders at the same time, the exhaust manifold and the turbocharger pipeline are arranged separately, and the pulsating exhaust gas is guided by two independent spiral air chambers inside the turbocharger, which effectively prevents the air flow in the intake and exhaust manifold of the engine from interfering with each other, greatly helps to reduce the turbo lag of the engine at low speed, and makes the engine closer to the linear power output and sensitive response speed of the high-performance naturally aspirated engine in power output.
Generally speaking, compared with the ordinary single-channel turbocharger, the double-channel turbocharger has a stronger supercharging coefficient, and the power output and thermal efficiency of the engine are naturally higher. Compared with the turbocharger with single-channel design, the dual-channel design can significantly improve the performance, recover the energy in the exhaust gas more effectively, reduce the parasitic reverse loss, and improve the response speed, low torque output and emission problems of the engine at low speed, although the process is more complicated.
As an old-fashioned hard-core technology manufacturer, Borgwarner also demonstrated that its dual-channel turbocharger is also suitable for some small-displacement engines. However, as far as the models currently on the market are concerned, they are only seen in a few entry-level models such as Buick Regal and Haval H7. After all, without further optimizing this technology, most manufacturers will not easily reduce it to entry-level models on a large scale.
However, at present, this brand-new dual-channel turbocharger is specially tailored for BMW's high-performance models. It uses high-temperature resistant materials at all costs to meet the working requirements of the engine with high supercharging coefficient at high temperature, thus increasing the turbocharging upper limit, and at the same time helping to improve the combustion conversion rate of fuel and air and reduce exhaust emissions.
At present, BMW's own engine technology can be described as painstaking. Looking at the market, from the power output curve, BMW's turbocharged engine is the closest to the naturally aspirated engine among many manufacturers. Now the dual-channel turbocharger equipped with this Borgwarner is even more powerful.
This article comes from car home, the author of the car manufacturer, and does not represent car home's position.