Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Active cylinder technology(ACT)


Published on

It's a technology which made over fuel saving concept , so it's very useful and popular technology in automobile industry.

Published in: Technology
  • Find your dream house:
    Are you sure you want to  Yes  No
    Your message goes here

Active cylinder technology(ACT)

  1. 1. Subrata Mete a, Krishanu Dutta b a. Student, Durgapur Institute of Advanced Technology & Management,,9733644067 b. Student, Durgapur Institute of Advanced Technology & Management,,7679255941
  2. 2. • ACT(Active Cylinder Technology) is a fuel efficient technology of multi- cylinder IC(gasoline & diesel) engines, which based on cylinder deactivation concept .This technology is also known as CDT (Cylinder Deactivation Technology).ACT simply deactivates some cylinders when the vehicle doesn’t need(when vehicle run in level rode condition at constant speed or in downhill condition) the total generated power of engine. There should be at least 4 cylinders in engine to perform ACT. The concept of ACT is first practically applied by MERCEDES BENZ on their V12 & V8 engines. ACT is mainly perform by ECU (brain of engine). ECU simply deactivates the valves & injectors that results stop of combustion hence cylinders. By using ACT we can increase the fuel efficiency by 30% & Breathing capacity of engine(volumetric efficiency) increase. But it also has some disadvantages such as the total weight of the engine increase ,tougher to balance. But in front of advantages ,the disadvantages are minor & can be neglected. Hence we should definitely use ACT if we want greater fuel efficiency. : multi cylinder engine, cylinder deactivation , sensors & ECU , increase fuel & volumetric efficiency .
  3. 3. • Active Cylinder technology which can reduce emissions and increase the engine efficiency. Cylinder deactivation will change the dynamics and vibration behavior of the engine . When vehicle not need the total amount power of engine then cylinder deactivation concept working by ECU which technically known as ACT. In This technology half of cylinders are shutdown, out of total number of cylinders. Now, • When we see ACT in a research manner , many questions arises:- I. What will be the benefit in terms of engine efficiency? II. What are the advantages & disadvantages of cylinder deactivation? & iii. How this ACT system works ? We shall discuss all these questions briefly. • This is a technology of Internal Combustion engine(gasoline & diesel) by which we can make a revolutionary change in automobile industry.
  4. 4. • The concept of ACT is first practically applied by MERCEDES-BENZ on their v12 & v8 engines, after that HONDA applied this technology on their v6 engine & then VOLKSWAGEN in 2012 and won “Engine of the year” award for applying this technology successfully in 4 cylinder engine. • After that AUDI adopt this concept in their new car AUDI A3. Recently BOSCH is experimenting on some new concept with ACT.
  5. 5. The total working principle of ACT is based on electronic control unit (ECU).which known as “ brain ” of engine. The running condition of engine such as speed , torque , rpm of wheel ,engine valves speed ,etc, is all time sensed by the different kind of sensors and sensors transfer all this information to the ECU and when ECU detects the right condition(when vehicle doesn’t need the total amount of power of engine when it goes on constant speed or in deceleration condition)then ECU quickly stop exhaust & inlet valves respectively and fuel injector in selective cylinders that’s why cylinder stops combustion process within just 0.5microsec . Now again when engine need more power at acceleration or uphill condition then ECU again activate the cylinders which were deactivated . In this way ACT works. Now we need to know that, when combustion process is stopped(by closing valves)then the movement of pistons are not shutoff, why? Because its need to work as “air spring” with running crank shaft . This air spring perform as periodical compression and expansion cycle, Which eliminates the pumping losses . There are three condition to start deactivation ,before exhaust stroke , after intake stroke & after exhaust stroke. Now we need to know that ,1. which condition is more preferable in the time of deactivation of cylinders ? And ACT actually deactivate the cylinders ?
  6. 6. 1.If we use after exhaust stroke condition as “air spring” then it is more preferable then the others because the concept shown below- Before exhaust after exhaust or after intake 1. air spring 1.Air spring 2.Slow cool down 2.engine running smoothly 3.Highly irregular engine running 3.high torque neutrality. 4.No torque neutrality.
  7. 7. 2.Now Lets start the dicussion on total working procedure of deactivation process -- Electronic control unit also known as brain of engine contains many parts such as CDCM(cylinder deactivation control model) , SSM(solenoid system model),HSM(hydraulic system model),LLPM(Lifter locking pin model).This SSM,HSM,LLPM is collectively known as cylinder deactivation hardware dynamic model. when solenoid valve is energized by CDCM then a pressure is generated in oil control port that is connect with solenoid. Now as oil is pressurized, this pressure transferred to HSM & this pressure force lock the lifter pin .Now the fuel injection system is turned off by ECU. These two action deactivates the cylinder.
  9. 9.  Now we need to know how lifter pin system works? lets starts- Lifter Pin mechanism is divided into two parts:- I. Finger follower II. Cam sliding system Solenoid is connected with a hydraulic control system Which contains oil. Now when solenoid energized a pressure is developed in oil & this pressurized oil goes to finger follower & it Engage with cam sliding system which is in secondary cam shaft .Now the selected cam is displaced from their own position & that’s why inlet and Exhaust valve disengage from cam which result in deactivation of cylinder .The remaining gas now works as “air spring” & its help to eliminate the pumping loss.
  10. 10.  Increased fuel efficiency (10-30 %)  Decreased emissions from deactivated cylinder.  Better breathing capability of engine.  Reducing the power consumed in suction stroke.
  11. 11. Engine balancing-by deactivating cylinders can cause of change in engine balancing. Increased the cost of engine. Overall increase in weight. Complexity of engine became high.
  12. 12. • To reduce the pollution from the internal combustion engines and the demand of automobile which burns less fuel • With increase the price the petroleum products the fuel is burnt according to power requirement. • So , ACT solves this problem to a great extend without compromising engine performance thus satisfies both manufacturer and consumer.
  13. 13.  Cylinder deactivation system on 4 cylinder engine (peters ,G)  Internet  Wikipedia (u k)  Volkswagen act system (u k)