• ICROS
• /
• v.2 no.2
• /
• pp.35-40
• /
• 1996

이 글에서는 자동차 Body 전자제어 시스템 개요 및 개발동향에 대하여 살펴보았다. 향후 Body 전자제어 분야에서는 사고예방을 위한 첨단 안전 시스템 개발, 정보 및 통신시스템을 이용한 Navigation 시스템 개발, 차량 LAN구축, ECU(Electronic Control Unit) 통합기술 개발을 위한 노력이 가속화될 것으로 전망된다. 이러한 시스템의 개발을 위해서는 자동차 부문과 관련 전자 부문의 긴밀한 공동 연구체제가 확립되어야 함과 동시에 통신기능을 갖춘 지능형 도로 시스템 구축, 교통전용 방송국 운용 등 정부차원에서의 Infra-structure 건설이 시급한 상황이다. 이를 위하여 정부 주관하에 자동차 각사, 유관업체 및 연구기관의 참여로 전국 도로에 대한 Digital Map 개발을 위한 G-7 Project 등의 다양한 계획이 진행중이거나 추진 예정으로 있는 바 성공적으로 수행될 경우 2005년을 전후로 하여 안전성 및 편의성 측면에서 완벽한 시스템을 구축할 수 있을 것으로 사료된다.

• Electronics and Telecommunications Trends
• /
• v.20 no.6 s.96
• /
• pp.24-35
• /
• 2005

지능형 순항 제어 시스템(Adaptive Cruise Control System)은 자동차가 정속을 기준으로 주행중 센서를 활용하여 감지하는 도로 상황에 대한 실시간 정보를 자동차의 전자제어부(ECU)로 연결하여 매 순간 안전상황을 확보하기 위한 조치를 자동으로 취한후 다시 정속 주행으로 복귀할 수 있도록 제어하는 차세대 첨단 자동차 주행용 안전 장치를 통칭하는 개념이다. 본 분석에서는 Global Industry Analysts의 보고 자료(2005.1.)를 바탕으로 시장 전망과 세계 업계의 개요를 소개하여 우리나라의 관련 기술에 대한 길잡이로 활용하고자 한다.

• Proceedings of the KSME Conference
• /
• 2008.11a
• /
• pp.1309-1313
• /
• 2008

This paper suggests an example of modification of the durability test specifications of electronic control unit for an automotive system in phase of design validation. The basic concept to redefine the specifications of durability test is based on the Arrhenius relationship for accelerated temperature test and the modified Coffin-Manson model for temperature cycle test. The ambient temperature of the powered-event durability test is increased to reduce the required test time of the current specification. Furthermore, the holding time between the events to cool down the temperature of the components is shortened and the resultant temperature rise affects the durability of the components. Thus, the acceleration factor due to the increased temperature range of temperature cycle is also estimated by the modified Coffin-Manson model.

• Journal of the Korean Society for Precision Engineering
• /
• v.17 no.7
• /
• pp.106-112
• /
• 2000

The purpose of this paper is to study on the control of the engine idle speed under sudden A/C load which is one of the most severe disturbances on engines. Three types of the closed-loop controller are developed for the stable engine idle speed control. The input of the controller is an error of rpm. The output of the controller is an ISCV duty cycle. The anticipation delay is considered to deal with the delay time of the air mass in engine. The PID, Fuzzy and PID-type Fuzzy controllers with the anticipation delay have improved the engine idle speed condition more than current ECU map table under the A/C load.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.4 no.3
• /
• pp.122-129
• /
• 1996

The spark timing is one of major parameters to the engine performance and emissions. The ECU controls the spark timing based on preset values, which are functions of load and speed, in most of today's automotive SI engine. In this system, the preset spark timing can be different from optimum value due to the deviations from mass production, aging effects and so on. In the present study, a control logic is investigated for real time adaptation of spark timing to optimal value. It has been found that crank angle of miximum cylinder pressure is one of the appropriate parameters to estimate the optimum spark timing throught experiment. It has also been observed for spark timing convergence by variation of engineering model factors. The simulation program including engineering model for cycle by cycle variation of combustion is developed for surveying spark timing control logic. It is also shown that simulation results reflect experiment outputs and reasonableness of spark timing control logic for crank angle of maximum cylinder pressure.

• Journal of the Korean Institute of Gas
• /
• v.20 no.6
• /
• pp.37-42
• /
• 2016

The purpose of this paper is to study for the emission gas control of passenger car. The first example, the PCSV never open when operating condition, but it opened by causing malfunction because of trouble. As a result, the purge gas entered into surge tank, a mount of fuel was displayed with excessive supply on tester. Therefore, it certified the bad-condition of the engine when idling by decreasing of fuel injection quantity from engine ECU. The second example, the hose activating a EGR valve didn't supply the vacuum pressure because of assembling the other part. Thus, it knew the bad-condition of engine that the EGR valve would not work normally by leaking with the other port. The third example, as the rear oxygen sensor of two sensor were fault-installing by changing the sensor of other a car it could not detect of oxygen quantity. Finally, it found the phenomenon of abruptly decreasing vehicle speed when braking a car. Therefore, the system including with emission control has to drastically manage by maximizing condition to role decreasing the emission gas.

• Journal of Institute of Control, Robotics and Systems
• /
• v.17 no.1
• /
• pp.1-5
• /
• 2011

The basic signals for electronic engine control are velocity and degree of the engine cam shaft. The CPS sensor used for this signal and magnetic pick-up type CPS sensor is more popular. It is very important thing analyze this signal correctly. If there are some mistakes at the analysis, like a noise, The engine do not working at the best status, it will generate some noise, emit exhaust fumes and waste more gases. In general way to analysis this signal, you use zero-level detector circuit and in order to reduce the error you must use another sensor like a TDC sensor. In this paper, We proposed the analysis method using electronics circuits for magnetic pick-up type CPS sensor. We designed Comparison level detector circuit, Differential circuit and Full-rectifier circuit for detected the Long tooth and Short tooth level correctly without another sensor. We expected it is useful for more reliable engine control.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.7 no.9
• /
• pp.36-47
• /
• 1999

Three-way catalyst converter, cleaning up the exhaust gas contamination of SI engine, has the best efficiency when A/F ratio is near the stoichiometry . The feedback control using oxygen sensors in the exhaust manifold has limits caused by the system delays. So the accurate measurement of air flow rate to an engine is essential to control the fuel injection rate especially on transient condition like the rapid throttle opening and closing. To measure the rapid change of flow rates. the air flow meter for the engine requires quick response, flow reversal detection, and linearity . Tjhe proposed integration type air flow meter (IFM), composed of an ultrasonic flow meter with an integration circuit, has significantly improved the measurement accuracy of air mass inducted through the throttle body. The proposed control method estimated the air mass at the cylinder port using the measured air mass at the throttle . For the fuel dynamic model, the two constant fuel model is introduced . The control parameters from air and fuel dynamics are tuned to minimize the excursion of the air fuel ratio. As a result A/F ratio excursion can be reduced within 5% when throttle rapidly opens and closes at the various engine conditions.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.10 no.4
• /
• pp.175-180
• /
• 2002

In order to satisfy the requirements of time reduction and cost saving for development of electronic control systems(ECU) in automotive industry, the applications of a standardized real-time operating system(RTOS) and a communication protocol to ECUs are increased. In this study, a body control module(BCM) that employs OSEK/VDX(open system and corresponding interfaces for automotive electronics/vehicle distributed executive) OS tour the RTOS and a controller area network(CAN) fur the communication protocol is designed, and the performances of the system are evaluated. The BCM controls doors, mirrors, and windows of the vehicle through the in-vehicle network. To identify all the transmitted and received control messages, a PC connected with the CAN communication protocol behaves as a CAN bus emulator. The control system based upon in-vehicle network improves the system stability and reduces the number of wiring harness. Furthermore it is easy to maintain and simple to add new features because the system is designed based on the standards of RTOS and communication protocol.

• Journal of Welding and Joining
• /
• v.31 no.5
• /
• pp.54-58
• /
• 2013

Joint properties of vehicle ECU (Electric Control Unit) module which was manufactured by using Sn-Cu-Cr-Ca alloy were investigated. A new solder which has a middle melting temperature about $231^{\circ}C$ was fabricated as the type of 300um solder ball and paste type. The prototype modules were made by reflow process and measured spreadability, wettability shear strength and estimated interface reaction. The spreadability of the alloy was about 84% from the measurement of contact angle of the solder ball and the wetting force was measured 2mN. The average shear strength of the module which was manufactured by using the solder paste, was 1.9 $kg/mm^2$. Also, the thickness of IMC(intermetallic compound) was evaluated with various aging temperature and time in order to understand Cr effect on Sn-0.7Cu solder. $Cu_6Sn_5$ IMC was formed between Cu pad and the solder alloy and the average thickness of the $Cu_6Sn_5$ IMC was measured about 4um and it was about 50% of thickness of $Cu_6Sn_5$ IMC in Sn-0.7Cu. It is expected to have a positive effect on reliability of the solder joint.