Mohammed Ataur Rahman

Design of a current comparator for quaternary multi valued Analog to Digital Converter

A low-power quaternary comparator circuit using current-mode CMOS multiple-valued logic (MVL) circuits has been presented in this paper. Existing MVL comparator circuits consume high power. The circuit presented in this paper has been shown low power digital output. It has been simulated with PSPICE using the transistor model parameter values of the BSIM3 NMOS model V3.2 for 0.13 μm CMOS process. With a 1.3-volt power supply, simulations show that the proposed quaternary comparator consumes 0.107 mW total average static power and a sampling rate 500MHz. Power and speed for comparators designed in these technologies are discussed. The comparator design is suitable for the needs of mixed-signal integrated circuit design and can be implemented as a conversion circuit for systems based on multiple-valued logic design.

Application of Multi-Objective Genetic Algorithm (MOGA) for Design Optimization of Valve Timing at Various Engine Speeds

This paper aims to demonstrate the effectiveness of Multi-Objective Genetic Algorithm Optimization and its practical application on the automobile engine valve timing where the variation of performance parameters required for finest tuning to obtain the optimal engine performances. The primary concern is to acquire the clear picture of the implementation of Multi-Objective Genetic Algorithm and the essential of variable valve timing effects on the engine performances in various engine speeds. Majority of the research works in this project were in CAE software environment and method to implement optimization to 1D engine simulation. The paper conducts robust design optimization of CAMPRO 1.6L (S4PH) engine valve timing at various engine speeds using multiobjective genetic algorithm (MOGA) for the future variable valve timing (VVT) system research and development. This paper involves engine modelling in 1D software simulation environment, GT-Power. The GT-Power model is run simultaneously with mode Frontier to perform multiobjective optimization.

Design of a 2-bit multi valued analog-to-digital converter

A 2-bit higher radix analog-to-digital converter (ADC) circuit consisting of a combination of a pipelined ADC(and a set of cascaded current comparator cell has been proposed. The ADC generates multi-valued logic outputs rather than the conventional binary output system. The design is implemented using 0.13|im CMOS process. The performance analysis of the design shows desirable performance parameters in terms of response and low power consumption. The ADC design is suitable for the needs of mixed-signal integrated circuit design and can be implemented as a conversion circuit for systems based on multiple valued logic design.

Intelligent Control Electromagnetic Actuated Continuously Variable Transmission System for Passenger Car

Continuously variable transmission (CVT) system transmits the engine /battery power to the car driving wheel smoothly and efficiently. Cars with CVT produces some noise and slow acceleration to meet the car power demand on initial start-ups and slow speed. The car noise is produced as a result of CVT adjustment the engine speed with the hydraulic pressure. The current CVT problems incurred due to the slow response of hydraulic pressure and CVT fluid viscosity due to the development of heat.The aim of this study is to develop electromagnetic actuated CVT (EMA-CVT) with intelligent switching controlling system (ICS). The experimental results of ¼ scale EMA shows that it make the acceleration time of the car in 3.5-5 sec which is 40% less than the hydraulic CVT in the market. The EMA develops the electromagnetic force in the ranged of 350 –1200 N for the supply current in the range of 10-15 amp. This study introduced fuzzy intelligent system (FIS) to predict the EMA system dynamic behaviour in order to identify the current control for the EMA actuation during operation of the CVT. It is expecting that the up scale EMA-CVT would reduce the 75% of vehicle power transmission loss by accelerating vehicle in 5 sec and save the IC engine power consumption about 20% which will makes the vehicle energy efficient (EEV) and reduction of green house gas reduction.

Electromagnetic Actuated CVT system for vehicle

Electromagnetic Actuated Continuously Variable Transmission (CVT) system offers an opportunity to meet the challenge due to its improving automotive drivability and better fuel economy and dramatically reducing greenhouse gas emissions. The pushing and pulling the sheaves of the pulleys are conducted in this study in order to maintain the desired transmission ratio or gear ratio of the passenger car in all types of the road by developing electromagnetic solenoids (electromagnetic actuators). The operation of the solenoid is performed by controlling the eddy current with the aids of the lead acid battery, magnetic pick-up sensor and potentiometer. The response of the electromagnetic actuator is so fast that it can move both the sheaves of pulley at desired distance within fraction of seconds (0.01 s) in order to maintain the desired torque to the driving wheels in any road condition. The ability of the actuator is examined by applying additional load, voltage and number of turns of the solenoid. Experimentally, it was found that the EMA-CVT system was able to improve the 60% transmission losses of the car.

Performance of Ad Hoc Routing Protocols in Mobile WiMAX Environment

Worldwide Interoperability for Microwave Access (WiMAX) is a technology that bridges the gap between fixed and mobile access and offer the same subscriber experience for fixed and mobile user. Demand for such type of mobile broadband services and applications are growing rapidly as it provides freedom to the subscribers to be online wherever they are at a competitive price with other significant facilities such as increasing amounts of bandwidth, using a variety of mobile and nomadic devices etc. The earliest version of WiMAX is based on IEEE 802.16 and is optimized for fixed and nomadic access, which is further extended to support portability and mobility based on IEEE 802.16e, also known as Mobile WiMAX. However, frequent topology changes caused by node mobility make routing in Mobile WiMAX networks a challenging problem. In this study, we focus upon those routing protocols especially designed for wireless networks. Here, we compare the performance of four ad hoc routing protocols (AODV, DSR, OLSR and ZRP) for Mobile WiMAX environment under the assumption that each of the subscriber station has routing capabilities within its own network. From our simulation, we found that ZRP and AODV protocols outperform DSR and OLSR.