BMW N52 engine valve technology structure

Speaking of the valve technical aspects, I believe have paid attention to the automotive technology or some fans will understand, and TV ads are often able to see these valve technology. VVT-i, i-VTEC, CVVT, VVEL and so on, and they have their own differences. These terms represent that they have different functions, wherein the valve timing variable technology also has a variable valve timing together with valve lift technology, such as I-VTEC, VVEL both. However, these are just some Japanese engine valve technology, As regards the European Department of the engine, there exists what kind of valve technology. BMW engine series, the most common form of valve technology is the VANOS that BMW's variable valve technology. BMW has joined many engines Double-Vanos, also uses variable valve timing technology in the intake side and exhaust side. In addition Vanos technology, there is another called Valvetronic technology.

Although the N52 engine with Valvetronic technology, but only with the intake side, the exhaust side is lacking.

The principle and structure of the Valvetronic system is actually more complex compared to others such as Honda AVTEC similar systems. Valvetronic principle to change the valve lift is actually in the valve rocker an additional intermediate shaft, intermediate shaft connected to a computer-controlled stepping motor. The shaft has a semicircular circumferential rotation of the eccentric wheel. In addition, the valve rocker added in the middle of a floating arm, middle arm driven by the cam control valve opening and closing. Changing the valve lift is through rotation of the eccentric, to promote the branched intermediate arm, changing the position of the intermediate arm, so as to control the depth of the valve opening and closing. So as to achieve even in the same kind of the camshaft angle, can have from 0-10mm valve lift changes. This valve lift change is based on the engine speed, load and other conditions, and is automatically and stepless change the valve lift. Already mentioned above, the rotating eccentric use of a stepper motor, stepper motor through a worm gear worm structure to control the rotation of the eccentric axle via a computer-controlled stepper motor actuator speed is very fast. Valve lift from the shallowest to deepest requires only a speed of 0.3 seconds. I.e., in the blink of an eye will be able to complete the process of increase or decrease in the valve lift.