Industrial Consultancy & Sponsored Research (IC&SR) , IIT Madras
A Continuously Variable Valve Duration Mechanism for the Internal Combustion Engine
Categories for this Invention
Category: Internal Combustion engine and Transportation /Assistive, Test Equipment and Design Manufacturing
Industry: Automotive Industry.
Application: Internal Combustion(IC) Engine.
Market: The global Automotive Market size was valued at USD 108.10 Billion in 2022 and is poised to grow from USD 116.86 Billion in 2023 to USD 217.90 Billion by 2031, at a CAGR of 8.1% during the forecast period (2024-2031).
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Problem Statement
- The internal combustion engine basically works on a four-stroke process of induction, compression, combustion, and exhaust.
- The valves (intake and exhaust valves) are one of the major components of the engine and are characterized by valve duration, which describes how long a valve is open.
- Continuous variable valve lift (CVVL), adapted to change valve lift according to the engine speed.
- Later, a continuously variable valve timing (CVVT) device, adapted to enable different valve timing operations.
- However, CVVT devices are complex to design, high cost, and have a shorter valve operating range .
- The present invention is to overcome the configuration of continuous variable valve duration mechanism for the internal combustion engine.
Technology
- The continuously variable valve duration mechanism includes a camshaft, a fixed member and a movable member adjacently mounted to each other on the camshaft.
- The movable member is configured to displace between a first position and a second position relative to the fixed member.
- The mechanism further includes a disc which is rotatably positioned within the movable member and coupled to the camshaft by a first pin.
- Furthermore, the mechanism includes a cam, which is connected to the disc by a second pin and configured to rotate corresponding to the rotation of the disc.
- The cam can rotate at rotational speeds higher or lower than the rotational speed of the camshaft depending on position of the movable member between the first position and the second position based on duration of the valve (i.e., for how longer the valve must be opened).
- The movable member can be displaced to desired position/location between the first position and the second position and the first pin and the second pin displaces to adjust the relative velocities between the cam and camshaft.
- Therefore, this configuration of the continuously variable valve duration mechanism is customizable and results in providing a wide operating range of altering the valve duration.
Key Features / Value Proposition
- New configuration for continuously variable valve duration mechanism for IC Engine.
- The displacement of the movable member between the first position and the second position results in changing centre of rotation of the camshaft and the cam.
- The change in centre of rotation of the camshaft and the cam facilitates in changing relative velocities of the camshaft and the cam.
- Less cost for manufacturing due to simple design
- High engine efficiency
Questions about this Technology?
Contact For Licensing
sm-marketing@imail.iitm.ac.in
ipoffice2@iitm.ac.in
Research Lab
Prof. Jayaganthan R
Department of Engineering Design
Intellectual Property
IITM IDF Ref. 2086
Patent No: IN 530846
Technology Readiness Level
TRL – 4
Technology validated in lab scale.