Current requirements and potenti als of variable valve trains variable valve trains facilitate the adjustment of the valve lift functi on to match the operati ng conditi on of the engine. Apr has developed an excellent entry level turbocharger upgrade for the 2. Safety informationimport ant safety instructions iv. Audi uses it for different purposes in different engines, but the working principle is the same for all engines. How to replace an audi b7 cabriolet roof motor save. In internal combustion engines, variable valve timing vvt is the process of altering the timing.
Request pdf dynamic analysis of the audi valvelift system fully variable valve trains provide comprehensive means of adjustment in terms of variable valve. The system thus increases torque while also reducing fuel consumption. The audi valvelift system enables the volume of air drawn in to. This paper concentrates mainly on partiallyvariable valve trains. Intake and exhaust port pressure pulses at full load firing at 2000 rpm of an i6. Valve profile for an internal combustion engine cfd. Jlg models 1200sjp 50sjp service and maintenance manual pn 3121142 pdf download this is the most practical service repair manual for the jlg 1200sjp, 500sjp workshop. Basic method of operation using bump as an example bump absorption. Through this height limitation a lift up of the vehicle with the rotary. Pdf design evaluation of a follower cam with variable valve lift. Audi uses two versions of this innovative technology. And they will be leaders in their class with a newly developed engine, intelligent lightweight design and a package of innovative technologies from the fullsize class, especially in terms of. In the audi a6, the engine operates with the partial valve lift at up to 140 kmh in fifth gear, and at up to 150 kmh in sixth gear. Analytical synthesis and computeraided kinematic analysis of a.
A variety of twostage, or discrete, variable valve lift dvvl and continuously variable valve lift cvvl systems have recently been incorporated in production vehicles. The 4cylinder tfsi engine by audi represents the next evolutionary step forward, the basis being the thirdgeneration engine. This paper presents an original continuously variable intake valve lift. Cant find where to download files referred to in title bar. The audi valvelift system now achieves the next step variable control of the valve lift, thus influencing the crosssection of the intake duct. This is an input file for defining how valve lift varies with different crank angles. The audi valvelift system enables the volume of air drawn in to be controlled to a large extent by the opening of the inlet valves. The cylinder movement is controlled by using control valve which directs the fluid flow. Review of advancement in variable valve actuation of.
The audi valvelift system avs has brought audi a great deal closer to this goal. Audi valve lifting system is another design for valve lifting which. The oil cannot drain out of the reservoir until the oil drain valve is opened. Article information, pdf download for analytical synthesis and. Investigation of control system strategies for hydraulic valve. Elevating the performance of your a3, the audi valvelift system intelligently varies the lift and duration of the engines exhaust valves, helping deliver. In this case, it regulates the amount of intake air by adjusting the lift in two stages. Use only the vehicle manufacturer recommended coolant for your engine in the intercooler system as well. Caution indicates a potentially hazardous situation wh ich, if not avoided, may result in moderat e or minor injury to the operator or to bystanders.
The greater the degree of variability that is used, the greater the potential that can be achieved. Free pdf download for thousands of cars and trucks. Workshop, repair and owners manuals for all years and models audi q7. Audi ag the two inlet camshafts are equipped with teeth.
Dynamic analysis of the audi valvelift system request pdf. An overview of the principles of the audi valvelift system can be seen in. The new audi s4 and s4 avant assume top positions in the new a4 family. The entire piston unit 1 is moved downwards inside the cylinder tube 2 at speed v. Can anyone explain how where to go, thanks in advance. Audi a4 b8 20082015 factory repair manual factory manual. Exploded view of the components of the mechanism with variable valve lift positions. The oil pressure in the chamber below the main damping valve 3 increases. Audi valve lift system avs in the operating ranges 1 2 3 t f i ll e v l a v e g r a l t f i l e. It consists of a platform containing the poppet valves, spark plugs, etc. Apr s ecu upgrade is developed to work within the oem and tier 1 supplier specifications for engine component stress tolerances and performance specifications. Avec l audi valvelift system, audi invente le moteur deuxenun.
Audi ssp 411 2 8l and 3 2l fsi engines with audi valvelift. Auto parts catalog, free download auto parts catalogs,pdf. Introduction, bioethanol, modifi cations to the basic engine, fuel system, engine management, overview of the bosch med 17. This manual can be viewed on any computer, as well as zoomed and printed, makes it easy to diagnose and repair problems with your machines electrical system. Several systems that have been introduced with the objective of reducing fuel consumption are described in this appendix. The greater the flow resistance for the oil flowing through the valves, the higher the damping force. The audi valvelift system avs is a technology for variable valve control. Variable valve lift vvl is an automotive piston engine technology which varies the height a valve opens in order to improve performance, fuel economy or emissions. Hydraulic variable valve timing testing and validation. Vag selfstudy programs ssp courtesy of volkswagen group of america, inc. Audi a4 b8 2008 2009 2010 2011 2012 20 2014 2015 factory repair manual, it is the unique repair manual created by audi ag exactly for your car, in pdf. Audi ssp 411 2 8l and 3 2l fsi engines with audi valvelift system pdf manufactured by the company audi presented for you in electronic format page size 842 x 561. Even when the v6 is running at full lift, the driver will notice one particular strength of the new technology.
You can get over 30 qualified cylinder head manufacturers here. For example, the combination of a variable camshaft phasing unit and a partiallyvariable valve train has proven advantageous. The audi valvelift system, one of the major innovations of the brand with the four rings, regulates the lift of the valves in two stages depending on load and engine speed. The new engine is available with a displacement of 2 litres and in 2 performance classes, one of which supersedes the previous 1. Specifications, engine mechanicals, oil circulation system, cooling system, air circulation system, fuel system, exhaust system, engine management. Page 8 engine the variable valve timing the camshaft timing has been modi. The cylinder head sits above the cylinders on top of the cylinder block. It uses sliding electromagnetic sleeves on the camshaft to vary the lift of.
On each of them sit three cam elements cylindrical sleeves, on the ou. Audi engines have already been carrying the variable valve timing for many years, and this is an addition of valve lift. Variable valve lift systems cost, effectiveness, and. Sleeves are mounted onto the camshafts which have cam profiles with varying contours. Also included in this selfstudy program is a description of changes needed to make a nonavs 2. The audi valvelift system avs uses the cam profile switching concept cps with a high lift.