In internal combustion engines have long valve controls the crankshaft via camshaft, to improve the combustion process and, consequently, capacity and consumption, the engineers make use of various tricks that make minor changes until recently fixed values: the start time and the end of the movement Vant, stroke valve and discrete or continuous control ernie of listed value. In spite of good solutions have also come to this technical limit, so engineers are looking for new, independent solutions that will - in addition to meet the basic already listed requirements - reliable, small (compact) and affordable.
Engines thus have various ways of adjusting the steering angle and the valve lift, but this is always carried out in conjunction with the position of the crankshaft. Solutions are actually the result of various patents, but they all have the same goal, namely to improve torque at lower engine speeds and reduce losses when changing materials and increase the flow of flue gas recirculation (EGR). Since all of these systems are connected directly to the crankshaft, their development is limited, as it is impossible to go beyond certain limits, which are dictated by such solutions. Quite a number of options allow the electric valves, which have instead of the cam curve to the shaft electro magnet, which valve is raised and lowered in relation to the electrical pulses and depending ernie on the control strategy of the engine. ernie This solution is independent from the physical connection to the crankshaft. The deterioration of this solution is noise nasedanju valve in extreme positions, the hard core of the magnet joints (which ernie can cause wear and tear) and relatively high electrical power required to drive the solenoid. It is possible synchronization valve to the crankshaft to approximately 6,000 to 7,000 revolutions per minute. Similarly, a solution is achieved by the use of a linear electric motor (instead of the solenoid), which allows somewhat greater flexibility in setting the time and the stroke of the valve.
New Solution Intelligent Valve Actuation System (IVA), which was to show the company Camcon, also has electric drive, ernie but the activator consists of an electric motor, scenery, which leads or restricts the movement of the valve in extreme positions (desmodromic), camshaft and springs, which allows easier movement, which improves the performance. Interestingly, each valve its activator, which because of the relatively good effect can be operated ernie at 12 V, and provides a completely free movement of the valve setting. ernie The actuator allows the camshaft to rotate 360 degrees, like the conventional cam shaft, ernie further, the continuous movement of the camshaft is possible only for a certain angle (displacement of the camshaft after the short or long steps up to a certain angle), but also may be relatively ahead or behind with respect to the crankshaft. This has enabled a number of things: setting the valve at the desired engine speed and torque, which can be great even at low speeds (downsizing), ernie insufficient EGR flow, throttle, suspension and reduction of loss when changing materials. Result or advantages are lower fuel consumption and CO 2 emissions by about 15 percent. The system can be adapted to new strategies combustion (HCCI ...), for use in 2-stroke ernie engines with a longitudinal or cross-flow and the Miller cycle, provides a simple switch or the possibility of the engine as a 2 - or 4-stroke in relation to the benefits that have one or the other way, but also allows the off rollers during operation of the engine. In Camconu assume that the system will come into use even before 2020, when they came into force even stricter legal standards regarding exhaust emissions and fuel consumption.
According to the theoretical and practical potential of such an independent system, especially with respect to all the sharper the set limits for exhaust emissions in the coming years, the internal combustion engine, if it wanted to survive as one of the propulsion systems of the car, had to adopt one of these solutions. Quite possible that this will Camconova. (AB)
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