Chan-Woo Moon

A comparative study of fuzzy logic-based control strategies for a parallel mild Hybrid Electric Vehicle

In this paper, power distribution control strategies are applied to a mid-size parallel mild Hybrid Electric Vehicle (HEV) and the control performances are compared. The structure and the operation principle of a HEV are introduced, and it is shown that a conventional fuzzy logic-based power control strategy can be modified for fuel consumption optimization. Through simulation results, the fuel-optimized fuzzy logic-based power control method is shown to give better control performance than other methods especially for the urban driving conditions.

DESIGN AND FABRICATION OF THE MICRO-GRIPPER FOR MANIPULATING THE CELL

ABSTRACT A novel micro-gripper is designed and fabricated to manipulate the micro-sized object like a cell. In order to grip the cell, the micro-gripper should be operated in the liquid environment. Since the mechanical type micro-gripper is rarely affected by the surroundings, it is suitable to treat the cell. The other consideration for manipulating the cell is properties of the cell such as the bursting force and the maximum deformation of the cell for the applied force. Thus, the sensor system is needed to measure the force on the cell during the gripping. On this micro-gripper, a piezoresistive sensor is integrated for sensing the gripping force. Using the fabricated micro-gripper, micro-glass beads are successfully manipulated in the water. The resistance in the piezoresistor is changed by 0.06∼ 0.07% for each 10 μ N of the applied force. Therefore, since the proposed micro-gripper satisfies the requisite conditions, it can be utilized for manipulation of the cell.

Design and Development of a Functional Safety Compliant Electric Power Steering System

ISO 26262 is an international standard for the functional safety of electric and electronic systems in vehicles, and this standard has become a major issue in the automotive industry. In this paper, a functional safety compliant electronic control unit (ECU) for an electric power steering (EPS) system and a demonstration purposed EPS system are developed, and a software and hardware structure for a safety critical system is presented. EPS is the most recently introduced power steering technology for vehicles, and it can improve driver’s convenience and fuel efficiency. In conformity with the design process specified in ISO 26262, the Automotive Safety Integrity Level (ASIL) of an EPS system is evaluated, and hardware and software are designed based on an asymmetric dual processing unit architecture and an external watchdog. The developed EPS system effectively demonstrates the fault detection and diagnostic functions of a functional safety compliant ECU as well as the basic EPS functions.

Design and Implementation of a FlexRay-CAN gateway for Real-Time Control

As the amount of data between ECUs has increased, the FlexRay consortium proposed FlexRay network system which has larger bandwidth than CAN. But because of implementation cost, CAN and FlexRay hybrid network with FlexRay-CAN gateway will make up the largest part of in-vehicle networks for the present. In this paper, a FlexRay-CAN gateway for a real time feedback control system is implemented, and a data packing algorithm is presented. Finally, a real control experiment with multi-motor system is conducted to verify the proposed gateway system.

Design of a Model Based Controller with Safety

Model based design method reduces product development period and increases system software safety. In this paper, a BLDC motor controller based on model based design method is designed with Simulink and implemented with auto generated code which is written in C language. To retain the safety of software, this model is implemented according to MISRA AC SLSF guide. The validity of the implemented controller is verified with a real position control experiment, and execution times of each control loops are measured to compare the system performance of the conventional design and the model based design.

Implementation of approach to functional safety compliant brushless DC motor control system

In this paper, a brushless DC (BLDC) motor control system is implemented to apply to an x-by-wire system based on ISO 26262 which is a functional safety standard for road vehicle. Recently, conventional mechanical and hydraulic systems are replaced by electric/electronic (E/E) systems to enhance the vehicle driving performance and safety. Particularly, because x-by-wire systems have the safety-critical functions, the reliability of the systems is needed to be improved by considering functional safety. For hardware and software requirement considered functional safety, electronic control unit (ECU) of the proposed BLDC motor control system has a microcontroller with an asymmetric dual-core architecture and an external watchdog. Functional safety oriented monitoring functions are implemented by using the ECU design and also verified by using hardware-in-the-loop simulation (HILS). The proposed system is very effective for detecting the software faults and mitigating the influence of the hardware failures with the functional safety compliant ECU.

Fabrication and wafer-level packaging of Si electrostatic microgripper for micro assembly

The wafer-level packaging of an electrostatic Si microgripper was investigated. It is important to ensure safe handling and freedom from damage during fabrication and assembly of micro devices. Some reliability problems have occurred during packaging or handling of the microgripper, regardless of actuation principles. After pre-release of the sacrificial layer, a new wafer-level packaging was processed by anodic bonding between a glass wafer with through-holes and a Si wafer device. A laser dicing has been performed before wire bonding for freedom from damage during both dicing and packaging processes. After the laser dicing, post-releasing has been done. The diced chips were actuated by applied voltage from 0 V/sub dc/ to 15 V/sub dc/. The jaws of the fabricated microgripper have been actuated from 0 /spl mu/m to 25 /spl mu/m.

Design of Autonomous Cruise Controller with Linear Time Varying Model

Cruise control is a technology for automatically maintaining a steady speed of vehicle as set by the driver via controlling throttle valve and brake of vehicle. In this paper we investigate cruise controller design method with consideration for distance to vehicle ahead. We employ linear time varying (LTV) model to describe longitudinal vehicle dynamic motion. With this LTV system we approximately model the nonlinear dynamics of vehicle speed by frequent update of the system parameters. In addition we reformulate the LTV system by transforming distance to leading vehicle into variation of system parameters of the model. Note that in conventional control problem formulation this distance is considered as disturbance which should be rejected. Consequently a controller can be designed by pole placement at each instance of parameter update, based on the linear model with the present system parameters. The validity of this design method is examined by simulation study.

Image Processing Based a Wireless Charging System with Two Mobile Robots

This paper presents the image processing algorithm for wireless charging between each mobile robot. The image processing algorithm converts Red Green Blue (RGB) format of inputted image to detect edge. It calculates a specific area using Hough Transformation (HT) in detected edge and judges correct charging antenna using Speeded-Up Robust Features (SURF). Accordingly, the image processing algorithm can control position and direction of mobile robot and antenna for wireless charging. The image processing algorithm is implemented wireless charging systems, which are set up on each two mobile robot and it is verified with experiment.

A New Type of Remote Power Monitoring System Based on a Wireless Sensor Network Used in an Anti-islanding Method Applied to a Smart-Grid

Renewable energy and the smart grid have become a major focus in industry. The smart grid is an intelligent system which maximizes energy efficiency; it needs to continuously monitor power production and consumption. Remote Monitoring Systems (RMS) are a very useful tool for this purpose, however they are mostly implemented using hard-wired communications.