Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 6 of 6 for “"VVT"”.
-
Development and testing of a variable valve timing system (VVT) for a twincam automotive engine
Variable valve timing (VVT) is an innovative design that enhances automotive engine performance and is important in addressing fuel consumption and emission output concerns. The purpose of the research reported here was to examine the concept of a VVT system because it had the promise of …
-
Advanced modeling ,control, and design of an electromechanical engine value drive system with a limited-angle actuator
… ---- in order to provide variable valve timing (VVT) in internal combustion (IC) engines. This electromechanical valve drive (EMV) system was proposed by Dr. Woo Sok Chang and his colleagues in the Laboratory for Electromagnetic and Electronic Systems (LEES), who also validated the feasibility of …
-
Design and simulation of high-performance hybrid electric vehicle powertrains
… a modeled spark-ignited, Variable Valve Timing (VVT) equipped internal combustion engine. A control strategy has been developed for the operation of these powertrains for virtually any driving condition---the strategy was not optimized for any particular government regulated cycle. Computer …
-
Managing transient behaviors of a dual mode spark ignition-- controlled auto ignition engine with a variable valve timing system
… this technology employs a Variable Valve Timing (VVT) system and is also often referred to as Controlled Auto Ignition (CAI) combustion in the literature. The objective of the study can be divided into two topics. First, the dynamic nature of load trajectory and several important phenomena in CAI …
-
Closed-loop, variable-valve-timing control of a controlled-auto-ignition engine
… engine equipped with a variable-valve-timing (VVT) mechanism. The controller in this study was designed only for use in the CAI regime. Operation in the SI regime and control of transitions between the CAI and SI modes were considered to be outside the scope of this study. The first part of the …
-
Study of a Pneumatic Hybrid aided by a FPGA Controlled Free Valve Technology System
Urban traffic involves frequent acceleration and deceleration. During deceleration, the energy previously used to accelerate the vehicle is mainly wasted on heat generated by the friction brakes. If this energy that is wasted in traditional IC engines could be saved, the fuel economy would improve. …