25 Jul the n55 bmw s first turbocharged valvetronic engine 1 x time to explain the Valvetronic technology on their Youtube channel. The common feature of BMW’s future reciprocating-piston petrol engines will be VALVETRONIC. 1 Nov Effective relationship in between Valvetronic Engine & BMW.
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Valvetronic is one of engibe terms often thrown around by BMW in their press releases, but seldom is being explained to the masses. Valvetronnic position of the lever converts the cam action into a smaller or larger valve lift, as requested by the engine management system. Download your Reports for Valvetronic Engine Technology. The folks at Engineering Explained took the time to explain the Valvetronic technology on their Youtube channel.
All of this should tecgnology achieved with a maximum standard of comfort and safety on the road. DME provides raw data to an on-board computer that uses an alphanumeric display to provide you with information such as the average fuel consumption, the distance you can still cover with fuel in the tank, an average speed, outside temperature and more.
A good opportunity to have a closer tecbnology. DME has a fail-safe program in the event of certain electrical faults. The primary objectives in developing drive systems are?
Clearly, the development engineer is unable to influence these external parameters? Its most important feature is that valvetroniv is able to save at least 10 per cent fuel throughout the entire operating range relevant to the customer, with a corresponding reduction in exhaust emissions, regardless of fuel quality.
A further advantage of this concept is that it allows worldwide use of the proven three-way catalyst for emissions management, thus meeting even the strictest emissions standards in the US. The three main tasks DME has to perform are 1 injecting the right amount of fuel and 2 providing a spark at the correct time. The voluntary commitment assumed by the European Automobile Manufacturers Association ACEA is to reduce the fleet emission average of all newly introduced cars to g of CO2 per kilometer by EnginesVideos July 25th, by Horatiu Boeriu 2.
Valvetronic allows the engine to run without a throttle butterfly, the cylinder charge being determined under part load as a function of the valve-opening period. In order to do this, the system needs to know things about the engine’s current state. The Valvetronic engine is the world’s first engine without a throttle butterfly. This movement alone, without any movement of the intake camshaft, can open or close the intake valves.
In the homologation of motor vehicles, Europe, Japan and the US apply different driving cycles to determine emissions and fuel consumption.
Looking at the overall concept of a vehicle, the development engineer must therefore optimize the efficiency chain formed by all of the car? The first objective is to minimise emission components such as hydrocarbon, CO2 and nitrogen oxides NOx subject to specific limits.
The pistons are still running, taking air from the partially closed intake manifold. Intake vale lift can be altered from a minimum of 0. Cylinder heads with Valvetronic use an extra set of rocker arms, called intermediate arms lift scalerpositioned between the valve stem and the camshaft. However, at the same time, this concept demanded the utmost of the electronic control and management systems in the engine.
Whenever we are required to make a great effort, we human beings breathe in a deep and long process of ventilation. Because the intake valves now have the ability to move from fully closed to fully open positions, and everywhere in between, the primary means of engine load control is transferred from the throttle plate to the intake valve train.
During part-throttle operation, the injector pulse-width is also modified by the readings from the oxygen sensor, a device that sits in the exhaust collector and determines how much oxygen is left over in the exhaust. It typically works in conjunction with the independent Double VANOS system that continuously varies the timing on both intake and exhaust camshafts.
DME then literally fine-tunes the engine hundreds of times a second to provide maximum performance and efficiency. Now Valvetronic replaces this conventional function by infinitely variable intake valve lift, offering a quantum leap in technology quite comparable to the changeover from the carburetor to fuel injection.
Are you interested in this topic. To make more efficient use of the energy in fuel, the actual process of using energy must reach a higher standard of efficiency. Thus, Valvetronic has the ability to get deep, long ventilation large valve lift and flat, short ventilation short valve liftdepending on the demands placed on the engine. Are you interested in any one of this Seminar, Project Topics. Whenever we need less air, we do not throttle the supply of air by, say, closing our nose or our mouth, but simply breathe in a shorter, flatter process of ventilation.
At light throttle, the throttle butterfly partially or even nearly closes. The Valvetronic system has a conventional intake cam, but it also uses a secondary eccentric shaft with a series of levers and roller followers, activated by a stepper motor.
Valvetronic – Wikipedia
By eliminating the throttle plate’s “bottleneck” in the intake track, pumping losses are reduced, fuel economy and responsiveness are improved. The intake manifold between the throttle and the combustion chamber has a partial vacuum, resisting the sucking and pumping action of the pistons, wasting energy. The additional, variable valve lift adjusts the effective cam action and, accordingly, the opening cross-section of the valves.
Latest Seminar Topics for Engineering Students. The cams controlling the eccentric shaft are machined to tolerances of a few hundredths of a millimeter. Digital Motor Electronics DME is a microprocessor-based system that controls the ignition, the fuel injection, the oxygen sensor and numerous ancillary functions.