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Failure Modes Investigation and Analysis of Electric Power Steering System with PMSM Drives

SAE International Journal of Passenger Cars - Electronic and Electrical Systems

MANDO Corp.-Jiyeol Kim, Seongjoo Kim
Changwon National University-Chinchul Choi, Wootaik Lee
  • Journal Article
  • 2009-01-0296
Published 2009-04-20 by SAE International in United States
This paper presents a method to investigate the failure modes of an electric power steering system and to analyze the faults effects systematically by use of an accurate simulation model. EPS is one of safety critical systems which should be designed to be fault-tolerant. In order to make a system fault-tolerant, some special design and analysis methods are indispensable. To analyze the effects of these faults the intuitive system model is developed using MATLAB/Simulink and the major failure modes of system are investigated. The developed model provides useful environments to inject and remove the various faults. The proposed model and method can be used to analyze faulty system dynamically, and it will be a great help to make a system more reliable.
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Model-Based Fault Detection of Advanced ESP

MANDO Corp.-Byoung-Joon Moon, Ho-Gi Jung, Hyung-Jin Kang, Pal-Joo Yoon
Kyung Hee Univ.-Chong-Kug Park
  • Technical Paper
  • 2006-05-0478
Published 2006-10-22 by Society of Automotive Engineers of Japan in Japan
This paper describes a model-based fault detection algorithm for an Advanced ESP System which consists of Hydraulic Control Unit (HCU) with built-in wheel pressure sensors. Advanced ESP System can be used for various value-added functions such as Stop & Go Function and Regenerative Brake Function. For these additional functions, HCU must operate at ordinary time. Therefore, HCU must have a reliable fault detection. Due to the huge amount of sensor signals, existing specific sensor-based fault detection of HCU cannot guarantee the safety of vehicle. However, proposed algorithm does not require the sensors. When model-based fault detection algorithm detects severe failures of the HCU, it warns the driver in advance to prevent accidents due to the failures. For this purpose, a mathematical model is developed and validated in comparison to actual data. Simulation results and data acquired from an actual system are compared with each other to obtain the information needed for the fault detection process.

3D Vision System for the Recognition of Free Parking Site Location

MANDO Corp.-Ho Gi Jung, Dong Suk Kim, Pal Joo Yoon
Yonsei Univ.-Jai Hie Kim
  • Technical Paper
  • 2005-03-0189
Published 2005-08-22 by Society of Automotive Engineers of Korea in South Korea
This paper describes a novel stereo-vision-based localization of free parking site, which recognizes the target position of automatic parking system. Pixel structure classification and feature-based stereo matching extract the 3D information of parking site in real time. The pixel structure represents intensity configuration around a pixel and the feature-based stereo matching uses step-by-step investigation strategy to reduce computational load. This paper considers only parking site divided by marking, which is generally drawn according to relevant standards. Parking site marking is separated by plane surface constraint and is transformed into bird's eye view, on which template matching is performed to determine the location of parking site. Obstacle depth map, which is generated from the disparity of adjacent vehicles, can be used as the guideline of template matching by limiting search range and orientation. Proposed method using both the obstacle depth map and the bird's eye view of parking site marking increases operation speed and robustness to visual noise by effectively limiting search range.

Fault Tolerant Protocol for CAN Flash Programming

MANDO Corp.-Ho Gi Jung, Jea Young Hwang, Pal Joo Yoon
Yonsei Univ.-Jai Hie Kim
  • Technical Paper
  • 2005-03-0099
Published 2005-08-22 by Society of Automotive Engineers of Korea in South Korea
This paper proposes a fault tolerant protocol for CAN (Control Area Network) flash programming. Recently, the need of CAN flash programming is rapidly increasing because the number of installed ECU (Electronic Control Unit) increases noticeably and the adoption rate of CAN are very high. Although some development tool companies and semiconductor companies provide solutions, there are no standards for CAN flash programming until now. Furthermore, there is always a risk, when programming an application into flash memory using downloaded programming algorithms, that an external disturbance may corrupt the programming process. This paper suggests that the standards of CAN flash programming should include mechanism for the recovery from faults and certification process.Interaction diagram between host PC and ECU summarizes the messages and includes an additional phase for the certification of the CAN communication capability of ECU. The state diagram of ECU with respect to CAN flash programming is developed and includes additional states for the recovery from faults and the certification of CAN communication. Proposed protocol guarantees that ECU can be programmed via CAN without the…
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A Study on the Dynamic Characteristics of the Continuously Variable Shock Absorber for Semi-Active Damping Control System

MANDO Corp.-Kyushik Park, Jeongrae Kim, Dongshin Kim
Published 2005-04-11 by SAE International in United States
The semi-active damping control system with continuously variable shock absorber is widely used to improve the vehicle dynamic characteristics such as ride comfort and driving safety. To achieve better vehicle performance, the continuously variable shock absorber must have a fast response time with wide range of damping force variation. In this paper, the analytic model is developed to estimate the effect of various parameters on dynamic behavior of the variable shock absorber, such as electromagnetic properties of solenoid, vibration of moving valve body and pressure prevailing time at damper stage due to compressibility of oil and container. By analyzing the derived model and carrying out the parametric studies, the response time of the shock absorber was reduced and it was verified by rig test.
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An Experimental Study on the Ball Screw Noise of Eps System

MANDO Corp.-Joo Namgung, Daijong Chung, Jaeyong Lee, Hegwon Jo
  • Technical Paper
  • 2004-05-0324
Published 2004-05-23 by Society of Automotive Engineers of Korea in South Korea
Recently the automobile makers tend to adopt an EPS (Electric Power Steering) system which uses an Electric motor for automobile steering assist force in order to reduce the fuel consumption and the emission.Among the electric power steering, Rack assist type EPS (R-EPS) which assists a rack bar has been a noise problem from the ball screw mechanism. And it is founded that this noise is generated from the ball screw gear itself, in other words, there is an obvious limit to reduce the rate of noise. In this reason, it is true that many steering system manufacturers are trying to develop the modified R-EPS system that can reduce the noise by decreasing RPM of the ball nut and that does not use the ball screw mechanism.This paper describes the process of understanding a change of noise property (frequency) while noise being transmitted from the ball screw to the driver and an approximate noise delivery path by testing and analyzing a noise in several states (a ball screw assembly, a steering gear assembly and a vehicle…