When it comes to valve technology, believe on automotive technology or some fans will understand, and TV commercials are often able to see these associated valve technology. For example, nissan consult 3 VVT-i, i-VTEC, CVVT, VVEL and so on, and they are all different. These nouns mean they have different functions, including valve timing variable technology also has a valve timing with variable valve lift technology, such as I-VTEC, VVEL two. But these are just some of the Japanese engine valve technology, as for the European engine and there is what kind of valve technology. BMW series engine, we are one of the most common valve technology is VANOS or BMW variable valve technology. Many of BMW engine has joined the Double-Vanos, is also on the side of the inlet and exhaust side the use of variable valve timing technology. In addition to Vanos technology, another is called Valvetronic technology.
Although the N52 engine equipped with the Valvetronic technology, but also is equipped on the side of the inlet, and the exhaust side is to owe from.
The principle of Valvetronic system and structure is relative to one another such as Honda AVTEC and other similar system is more complex. Valvetronic is used to change the valve lift of the principle is in fact the valve rocker to add an additional intermediate shaft, the intermediate shaft is connected to a computer to control the stepping motor. The shaft has a semicircular rotating eccentric wheel for. In addition, valve rocker arm, join a floating intermediate support arm, cam driven by the intermediate support arm to control valve opening and closing. Change valve lift is through the rotation of the eccentric wheel, push the intermediate arm, changing the intermediate arm position, to control valve opening and closing depth. Thus even in the same kind of camshaft angle, can have a 0-10mm valve lift changes. The valve lift of the changes are based on engine speed, load conditions, automatically and continuously changing valve lift. It has been said, by rotating the eccentric wheel is a stepper motor, stepper motor through a worm on the structure to control the rotation of the eccentric shaft, via a computer controlled stepper motor actuation speed is very fast. Valve lift from the shallow to deep need only 0.3 seconds. It is in the blink of an eye can complete the valve lift of the increase or decrease of the process.
The principle of Valvetronic system and structure is relative to one another such as Honda AVTEC and other similar system is more complex. Valvetronic is used to change the valve lift of the principle is in fact the valve rocker to add an additional intermediate shaft, the intermediate shaft is connected to a computer to control the stepping motor. The shaft has a semicircular rotating eccentric wheel for. In addition, valve rocker arm, join a floating intermediate support arm, cam driven by the intermediate support arm to control valve opening and closing. Change valve lift is through the rotation of the eccentric wheel, push the intermediate arm, changing the intermediate arm position, to control valve opening and closing depth. Thus even in the same kind of camshaft angle, can have a 0-10mm valve lift changes. The valve lift of the changes are based on engine speed, load conditions, automatically and continuously changing valve lift. It has been said, by rotating the eccentric wheel is a stepper motor, stepper motor through a worm on the structure to control the rotation of the eccentric shaft, via a computer controlled stepper motor actuation speed is very fast. Valve lift from the shallow to deep need only 0.3 seconds. It is in the blink of an eye can complete the valve lift of the increase or decrease of the process.
The ValveTronic system work process sketch map, A diagram schematic is not actuated state, the valve chamber to maintain normal lift, when the intake air amount is less, while the B diagram schematic of the eccentric rotation to the intermediate portion, a middle supporting arm slightly, then the valve lift is slightly increased, but no to the limits of the depth, C diagram schematic is an eccentric wheel complete actuation, the valve lift to reach the maximum level, intake air amount to get bigger promotion.
Stepless and continuous valve lift change is undoubtedly one of the great advantages of this system. Continuously variable valve lift can, for the power of the engine has a great help, lift is bigger, to enter the cylinder mixed gas is more, natural power output can be more robust. And with respect to a prior to the VTEC system, and does not use different lift cam to change the valve opening depth, so the power is not a level to rise, but relatively high linear to go. In addition to the power, oil consumption control aspect also has certain advantages, when idling or low speed running time, Valvetronic will automatically control valve lift decreases, achieved with less oil to drive the vehicle, achieve the purpose of saving oil. However, there are excellent natural degradation. There will always be above disadvantages, have referred to, rocker arm and cam are not directly connected together, but by a floating intermediate support arm, a middle supporting arm through a return spring fixed position. This design biggest bane is less rigid, although return spring specially crafted, but spring, there will always be fatigue phenomenon, especially at high engine rotates, cam shaft driving the increase in the number of natural springs, activity number increases, the metal fatigue may increase a lot. But in turn, if the return spring fatigue, then the consequences would be unbearable to contemplate. It actually can be determined, why in all M series engine, Valvetronic systems will invariably absent.
Stepless and continuous valve lift change is undoubtedly one of the great advantages of this system. Continuously variable valve lift can, for the power of the engine has a great help, lift is bigger, to enter the cylinder mixed gas is more, natural power output can be more robust. And with respect to a prior to the VTEC system, and does not use different lift cam to change the valve opening depth, so the power is not a level to rise, but relatively high linear to go. In addition to the power, oil consumption control aspect also has certain advantages, when idling or low speed running time, Valvetronic will automatically control valve lift decreases, achieved with less oil to drive the vehicle, achieve the purpose of saving oil. However, there are excellent natural degradation. There will always be above disadvantages, have referred to, rocker arm and cam are not directly connected together, but by a floating intermediate support arm, a middle supporting arm through a return spring fixed position. This design biggest bane is less rigid, although return spring specially crafted, but spring, there will always be fatigue phenomenon, especially at high engine rotates, cam shaft driving the increase in the number of natural springs, activity number increases, the metal fatigue may increase a lot. But in turn, if the return spring fatigue, then the consequences would be unbearable to contemplate. It actually can be determined, why in all M series engine, Valvetronic systems will invariably absent.
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