• 제목/요약/키워드: ECU (Engine Control Unit)

검색결과 43건 처리시간 0.022초

ECU 품질 개선을 위한 Accelerated Run-in Test 설계 및 효과고찰 (Design and Application of Accelerated Run-in Test for ECU Quality Improvement)

  • 조효근
    • 한국자동차공학회논문집
    • /
    • 제22권4호
    • /
    • pp.145-151
    • /
    • 2014
  • Modern vehicle has a lot of ECU(Electronic Control Unit) products to control many parts such as engine, transmission, brake, body and so on. ECU quality is one of important factors related to vehicle quality and driver's safety. Based on Bath-tub curve which presents failure rate during product lifetime, we designed and applied Accelerated Run-in Test into manufacturing line by simulating stress amount to ECU and developing the required software and efficient test equipment for mass production. This test makes ECU products stressed through electrical and thermal stresses under excessive driving condition, which induce potential initial failure of components in the ECU during production. The outcome until these days proved that Acceleration Run-in Test have reduced initial failure rates and increased quality of ECU products in the field outstandingly.

LPG 엔진의 공회전 영역에서 공연비 제어 특성 (Air-Fuel Ratio Control Characteristics of an LPG Engine at Idle)

  • 심한섭
    • 한국생산제조학회지
    • /
    • 제8권5호
    • /
    • pp.30-35
    • /
    • 1999
  • Since LPG has a higher octane number and a lower maximum combustion temperature than gasoline it is getting more popular for reducing emissions from the vehicle This paper when an LPG engine works in the range of idle analyzed the operating range preciously an provides reducing method of emissions for the LPG engine. An electronic control unit(ECU) for the LPG engine using a feedback mixer is presented. The ECU is built by using a microcontroller MC68HC05. A PI-controller is imple-mented in the ECU in order to handle to handle Air/Fuel ration control. The experimental results exhibit that the required engine performance are satisfied at idle.

  • PDF

PC-ECU를 이용한 SI 기관의 비정상상태 정밀공연비 제어 (Precise Air-Fuel Ratio Control on Transient Conditions with the PC-ECU in SI Engine)

  • 윤수한
    • 한국분무공학회지
    • /
    • 제5권3호
    • /
    • pp.9-16
    • /
    • 2000
  • In a SI engine, three-way catalyst converter has the best efficiency when A/F ratio is near the stoichiometry. The feedback control using oxygen sensors in the commercial engine has limits caused by the system delays. So it is necessary to control fuel quantity in accordance with intake air amount in order to reduce exhaust emission and improve the specific fuel consumption. Precise A/F ratio control requires measurement of air amount with respect to the cylinder and injection fuel according to the air amount In this paper, we applied nonlinear fuel injection model and developed the algorithm of A/F ratio control. This algorithm includes the methods of measurement of transient air mass flowing into each cylinder, of calculation of injection pulse width for measured air mass, and the method of feedback and engine control by using lambda sensor. Also we developed control program for IBM-PC by using C++ Builder, and tested it in the commercial engine.

  • PDF

Distributed ECU System Design for High Speed and High Precision Control of a Marine Engine

  • Lee, Jong-Nyun
    • Journal of information and communication convergence engineering
    • /
    • 제8권5호
    • /
    • pp.534-538
    • /
    • 2010
  • Efficient control of a marine engine requires an engine control unit (ECU) system that handles fast and precise signal processes for in-coming and out-going signals from fast running engines. In order to handle these roles, the sequential control has been adapted in the ECU system in small and medium size ship engines, which has caused high production cost and complexity of the system. Hence, this paper is focused on developing an distributed ECU system for high speed and high precision control of a marine engine by efficiently combining a CPLD chip and a microprocessor. By sharing load at the MCU with the designed CPLD chip, we could achieve in driving a marine engine with high speed and precise control so that the ECU board has been simplified and its production cost has been reduced.

자동차 엔진룸용 전장품 유무연 솔더 접합부의 열화특성 (Degradation Characteristics of Eutectic and Pb-free Solder Joint of Electronics mounted for Automotive Engine)

  • 김아영;홍원식
    • Journal of Welding and Joining
    • /
    • 제32권3호
    • /
    • pp.74-80
    • /
    • 2014
  • Due to environmental regulations (RoHS, WEEE and ELV) of the European Union, electronics and automotive electronics have to eliminate toxic substance from their devices and system. Especially, reliability issue of lead-free solder joint is increasing in car electronics due to ELV (End-of-Life Vehicle) banning from 2016. We have prepared engine control unit (ECU) modules soldered with Sn-40Pb and Sn-3.0Ag-0.5Cu (SAC305) solders, respectively. Degradation characteristics of solder joint strength were compared with various conditions of automobile environment such as cabin and engine room. Thermal cycle test (TC, $-40^{\circ}C$ ~ ($85^{\circ}C$ and $125^{\circ}C$), 1500 cycles) were conducted with automotive company standard. To compare shear strength degradation rate with eutectic and Pb-free solder alloy, we measured shear strength of chip components and its size from cabin and engine ECU modules. Based on the TC test results, finally, we have known the difference of degradation level with solder alloys and use environmental conditions. Solder joints degradation rate of engine room ECU is superior to cabin ECU due to large CTE (coefficient of thermal expansion) mismatch in field condition. Degradation rate of engine room ECU is 50~60% larger than cabin room electronics.

Racing Car ECU 의 제어에 의한 가속성능 향상에 관한 연구 (Electronic Control Unit Based Control of Racing Car to Enhance the Acceleration Performance)

  • 황의준;허장욱
    • 한국기계가공학회지
    • /
    • 제19권11호
    • /
    • pp.58-63
    • /
    • 2020
  • The fuel injection amount and timing along with the ignition timing for the gasoline engine of a racing car were adjusted using an electronic control unit (ECU), and the engine performance was evaluated through an acceleration test. The fuel map for the fuel injection amount and ignition map for the ignition timing were derived. Using the transient throttle control, the air-fuel ratio could be maintained at a constant value even in the case of a sudden throttle operation. In the flat shift, ignition blocking was more effective than fuel blocking. In a 75 m acceleration test, the required duration without and with ECU control was 4.47 s and 3.99 s, respectively. Notably, the acceleration could be improved by approximately 10.7% when the ECU control was implemented.

전자식 가속제어장치 안전기준에 대한 실험적 고찰 (An Experimental Study on the Safety Standard of Electronic Throttle Control System)

  • 윤경철;용기중
    • 자동차안전학회지
    • /
    • 제11권1호
    • /
    • pp.48-54
    • /
    • 2019
  • Optimal engine control is needed to cope with the global environmental regulations that are globally enforced. For optimum engine control, the electronic throttle control system (ETCS) is a prerequisite. Automotive makers are having an effect on reducing emissions and improving fuel economy by applying ETCS which is designed to secure stability. The ETCS controls the output of the throttle valve by passing the output value of the accelerator position sensor (APS) to the engine control unit (ECU). In this study, the authors investigated the safety standards of domestic and overseas accelerator control system and tried to understand how the air flow control affects the engine output by replacing the throttle. The authors suggest an improvement proposal of safety standard based on the result of driving evaluation by various modes.

Charged Cable Model (CCM) 정전기 방전(ESD)에 의한 전자제어장치의 손상 (Charged Cable Model (CCM) ESD Damage to ECU)

  • 하명수;정재민
    • 한국자동차공학회논문집
    • /
    • 제21권2호
    • /
    • pp.159-165
    • /
    • 2013
  • ESD damage by Charged Cable Model (CCM) is introduced. Due to its own impedance characteristic unlike Human Body Model (HBM) or Machine Model (MM) electric component can be destroyed even though it is located after typical protection circuit. Possible mechanism of ESD damage to automotive electric control unit (ECU) in vehicle environment by CCM discharge was investigated. Based on investigation, field-returned vehicle whose ECU is expected to be damaged by CCM discharge was tested to reproduce it and similar electric component destruction inside ECU was observed. Suggestions to reduce the possibility of ESD damage by CCM are introduced.

ECU 및 TCU 신호를 이용한 자동차의 공회전 자동정지 제어 시스템 개발 (Development of Automatic Idle Stop Control System with Signals of ECU and TCU)

  • 김성수
    • 한국정보통신학회논문지
    • /
    • 제9권7호
    • /
    • pp.1601-1606
    • /
    • 2005
  • 본 연구에서는 자동차가 정지하면 지정된 수초이내에 자동차의 공회전 상태를 자동적으로 정지시키고, 운전자가 출발하고자 할 때는 약속된 전기신호로 엔진의 시동을 거는 차량용 공회전 자동정지 제어시스템을 개발하였다. 이 장치는 다수의 선별된 엔진제어유닛과 변속기제어유닛의 전기신호를 입력신호로 하는 마이크로프로세서와 기타 주변 전자회로로 구성되어 있으며 자동차의 운전상태를 인식할 뿐 아니라 냉각수 온도에 따라 그 작동을 조정하고 재시동시 연료분사스킵 기법을 적용하여 자동차의 연료절약 및 유해배출가스를 저감하는 효과를 가지고 있다. 국내의 자동차 연비 및 유해배출가스측정 공인기관에서 ECE15+EUDC모드에서 본 제어시스템 장착차량의 주행시험을 실시하여 그 효과를 확인하였고 실차 적용가능성을 확보하였다.

차량주행 모사 조건에서 로드셀을 이용한 인젝터 누적 연료 분사량 측정 (A Cumulative Injected Fuel Mass Measurement Under a Vehicle Driven Condition using Loadcells)

  • 조성근;이충훈
    • 한국분무공학회지
    • /
    • 제21권1호
    • /
    • pp.1-6
    • /
    • 2016
  • A gasoline injector rig which can measure cumulative injected fuel mass under a vehicle driving condition was developed. The measurement system consists of an engine control unit (ECU), data acquisition (DAQ) and injected fuel collection system using loadcells. By supplying reconstructed sensor signals which simulate the real vehicle's sensor signals to the ECU, the ECU drives injectors as if they were driven in the vehicle. The vehicle's performance was computer simulated by using $GT-Suite^{(R)}$ software based on both engine part load performance and automatic transmission shift map. Throttle valve position, engine and vehicle speed, air mass flow rate et al. were computer simulated. The used vehicle driving pattern for the simulation was FTP-75 mode. For reconstructing the real vehicle sensor signals which are correspondent to the $GT-Suite^{(R)}$ simulated vehicle's performance, the DAQ systems were used. The injected fuel was collected with mess cylinders. The collected fuel mass in the mess cylinder with elapsed time after starting FTP-75 driving mode was measured using loadcells. The developed method shows highly improved performance in fast timing and accuracy of the cumulative injected fuel mass measurement under the vehicle driven condition.