The new engine plant will start production of the BMW Group's latest generation of 3-cylinder and 4-cylinder turbocharged engines. These two high-efficiency engines, which represent the world's leading level and have excellent performance, will gradually equip all of BMW's domestically produced models.
“In the next few years, our domestically produced models will be increased from the current three models to six models. The new engine factory will undoubtedly play an important strategic role, so that the BMW cars we produce in China can convey the original BMW brand spirit, that is, pure driving. Fun.†Dr. Hessen, President and CEO of BMW Brilliance Automotive Co., said at the opening of the new engine plant.
BMW's new generation of 3-cylinder/4-cylinder engines will completely replace the prestigious N20 engine. The new engine is the latest achievement in the modular design and production of the BMW Group. It upgrades the level from the layout and leaves enough interfaces to connect the new technology to become the industry. New benchmark. In the past two weeks, we have used ten questions to understand it, but now, just read it in one breath.
The first question: modular, parameter-set single cylinder arrangement
BMW's latest generation of 3-cylinder and 4-cylinder engines, one of which is "modular"; the basic unit of 0.5 liter per cylinder is extended to 1.5 liters for three cylinders and 2.0 liters for four cylinders.
The cylinder diameter and stroke of the engine are unified. The parts sharing rate of different cylinders reaches 60%, the parts supply becomes more coordinated, and the engine design follows a set of such ideas, with higher precision and more stable performance. . Engineers can quickly combine engines for vertical and horizontal placement.
Second question: long stroke, playing long punch
The new four-cylinder engine, which was put into production at BMW's new engine plant, has a cylinder diameter and stroke of 82mm and 94.6mm. Compared with the previous generation engine, the stroke of the cylinder piston is longer, which leads to an increase in engine torque.
The long-stroke movement is more powerful. Compared to the previous generation of fast-fighting engines, the torque of the new engine has been significantly improved. For the driver, it can be felt in the first foot oil. Taking the European version of F30320i as an example (the domestic engine parameters are based on data released by future manufacturers), the engine can explode a maximum torque of 290Nm from 1350rpm, which is 20Nm more than the previous generation, which is almost the first outbreak on the market. The maximum torque of the 2.0T engine, while the maximum torque output is maintained to 4250rpm. It is also necessary to mention the high compression ratio of 11.0, which means that the fuel consumption is force, the comprehensive fuel consumption is 5.5 liters per 100 kilometers, and the carbon dioxide emissions are only 124g/km.
Third question: Arc spraying, do you know?
At present, many engines use cylinders made of aluminum alloy. Aluminum itself is not wear-resistant. Many manufacturers have to put a liner on the inside of the cylinder; but BMW's solution is to use an arc spray process.
The cylinder wall coating of this process is only 0.33 mm, which is integrated with the cylinder. The high arc spraying process ensures that the strength of the coating is more than twice that of the inner wall bushing. Arc spraying can greatly reduce the friction coefficient of the cylinder wall, smoother piston movement, and make the engine lighter, with better thermal conductivity and longer service life.
Fourth question: high-precision in-cylinder direct injection, every drop of oil is completely burned
The new engine uses BMW's new HPI high-precision in-cylinder direct injection system. The injection pressure of 200 bar is controlled at 0.14 milliseconds, allowing multiple fuel injections in a single combustion process.
On the new six-hole injector, the diameter of each hole is different, in which the two injection holes near the exhaust valve are reduced by 20%, and the four holes near the intake valve are increased by 10 each. % of fuel injection, this design can make the fuel mixture on the exhaust valve side burn more fully, which brings the fuel economy to the engine.
Every drop of fuel should play its own role, otherwise its short "oil" will come to a cylinder, to atomize it to the maximum extent, and to exert its own heat, which is the value of high-precision in-cylinder direct injection.
Fifth question: I am not afraid that the three-cylinder vibration has lost the luxury style of BMW?
"Three cylinders are naturally more vibrating than four cylinders" is a folk saying, but is it really the same as experience? Of course not. In order to ensure the smoothness of the three-cylinder engine, a balance shaft is installed in the crankcase, driven by the crankshaft, and the rotation direction is opposite to that of the crankshaft. The rotation speed is the same as the crankshaft speed, which minimizes the first-order vibration of the engine.
As for the elimination of noise, BMW has added soundproof covers to almost every aspect of the latest generation of engines, even under the oil pan. This has the direct benefit of reducing the noise of oil pumps, pulleys, pumps, etc. that are transmitted to the cockpit. .
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