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Camless Engine

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KONGU ENGINEERING COLLEGE
PERUNDURAI , ERODE -638052 Tamil Nadu. (Approved by AICTE, New Delhi)

CAMLESS IC ENGINE WITH ELECTRO HYDRAULIC VALVETRAIN AND CRANKSHAFT POSITION FEEDBACK

V.PIRANESH, Second Year Mechanical Engineering, piraneshhh@gmail.com ph:9597848518

R.YOGESHWARAN Second Year Mechanical Engineering , yogesh260615@gmail.com ph :9894882579

ABSTRACT Presented within is a synopsis of the conceptual design, analysis and testing of a camless engine (CLE) with an electro hydraulic valve train. The system makes use of a piezoelectric controlled hydraulic actuator. This actuator serves as a replacement for the camshaft in an internal combustion engine (ICE). In essence, the actuator is an electro hydraulic device capable …show more content…

The concept of variable valve timing has existed for some time. Unfortunately, the ability to achieve truly variable valve timing has eluded automotive manufacturers. Most variable timing mechanisms were created as tools for the automotive engineer. Their use was limited to the laboratory as a means of testing multiple, “virtual” cam profiles. These early camless engines allowed for the designers to choose the best cams for the engine under scrutiny, but were less than energy efficient. Furthermore, they were laboratory machines and were not capable of being mass produced or utilized in an automobile. There have been a few attempts at developing production models of camless engines, most notably by Ford, but the use of solenoids has impeded their implementation. Using solenoids to control hydraulic fluid and ultimately the opening and closing of the engine valves introduces its own limitations. The solenoids consume considerable energy and are a binary control device – they are either on or off. Therefore the hydraulic fluid, controlled

LIMITATIONS OF THE CAM: NEED FOR VARIABLE VALVE TIMING
Automobile manufacturers have recognized the compromises associated with

by the solenoids, is either flowing or blocked. This design allows for some variance of valve timing, but is still limited by the response capabilities of the solenoids. Furthermore, it cannot directly address valve velocity or displacement changes.

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