BETTER PARTSFresh from a kit
Munich, August 1, 2016
BMW's modular engines are particularly consistently applied: all actuators have an aluminium crankcase with same position of inlet and outlet side, a volume of 500 cubic centimeters per cylinder, as well as the same arrangement of auxiliary units. Now, the engines were developed. BMW has already presented in the 750 the technology holder, a 400 HP Quad-turbo-diesel with six cylinders, xDrive. Well, there is information about the three and four cylinders diesel and Otto page.
Diesel: All four-cylinder with twin-turbo
When the auto fuses BMW is planning three-cylinder 95 and 116 HP four-cylinder with 150 231 to 190 HP. CO2 emissions should fall by four to five percent, in the future more stringent exhaust emission standards are adhered to and improves the acoustics. All four-cylinder diesel in the future get a twin turbochargers. Get among other things to reduce the NOx emissions both three as four-cylinder a high temperature - exhaust gas recirculation (EGR). She leads back the exhaust from the manifold through an adjustable valve (and depending on the need in cooled or cooled State) in the intake system. Because the high pressure EGR with the three cylinders in all fields of characteristic field can be enabled, this Additionally get a low temperature EGR. She takes the Abags only after the diesel particulate filter and leads to (cool) the clean air line.
High injection pressure and "Form honing"
The injection pressure was also increased now, depending on the engine he is 2,200 to 2,700 bar. So is the diesel more finely atomized and improves combustion. The so-called "form honing" future fixes a problem of cylindrical shape. So far, the cylinders were at the top and bottom just far. But in the operation of the motor is the upper range expanded by the forces. This leads either to play at the top (and in accordance with inferior acoustics) or doing the cylinder down close to more friction down (and thus higher consumption). At the new, used for the first time for production engines production way are the cylinders expanded now at the bottom slightly. In the operation of the motor, a uniform diameter for the whole cylinder set then.
Store cat plus AdBlue
To the exhaust gas cleaning, the future diesel have not only through a NOX storage catalytic converter, but also through a SCR (selective catalytic reduction) system with AdBlue. The AdBlue tanks are designed at BMW in General so that they normally every 15,000 km must be refilled which means the buyer must fill up once between the dates of service. So, the more stringent requirements on NOx emissions can be fulfilled by the new RDE rules (real driving emission), BMW believes. From September 2017, RDE measurements, so emissions testing in real traffic situations, are mandatory. Diesel cars may then exceed the limit for the dynamometer in everyday traffic to no more than 110 percent, so maximum launch 168 milligrams per kilometre.
Gasoline: More economical and more
Even when the petrol consumption and emissions by around five percent should fall, performance increases in addition to seven horsepower. Here too, the RDE limits should be respected. All are direct-injection in which aggregates a particulate filter, will be required is not yet fixed. The weight of the engines is reduced by five to eight kilos; to do this, including the crankshaft around one or two kilos became easier. Exhaust manifold and turbocharger are now integrated in the cylinder head. Also, the engineers have increased the injection pressure 350 bar (right, the pressures are much lower than for diesel engines with petrol engines). This allows a more precise dosing and improved quality of exhaust gas. Also a further developed cooling system helps to optimize the combustion process: the new coolant pump has separate outputs for cylinder head and engine block, which allows a better cooling. A one-piece control chain, in addition to optimizing the acoustic properties raise the efficiency. Which Motors of the changes are affected, still does not reveal BMW. (sl)