• Title, Summary, Keyword: Electronic Control Unit

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

  • Lee, Kyung-Jung;Lee, Ki-Ho;Moon, Chanwoo;Chang, Hyuk-Jun;Ahn, Hyun-Sik
    • Journal of Electrical Engineering and Technology
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    • v.10 no.4
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    • pp.1915-1920
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    • 2015
  • 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.

Ripple Analysis and Control of Electric Multiple Unit Traction Drives under a Fluctuating DC Link Voltage

  • Diao, Li-Jun;Dong, Kan;Yin, Shao-Bo;Tang, Jing;Chen, Jie
    • Journal of Power Electronics
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    • v.16 no.5
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    • pp.1851-1860
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    • 2016
  • The traction motors in electric multiple unit (EMU) trains are powered by AC-DC-AC converters, and the DC link voltage is generated by single phase PWM converters, with a fluctuation component under twice the frequency of the input catenary AC grid, which causes fluctuations in the motor torque and current. Traditionally, heavy and low-efficiency hardware LC resonant filters parallel in the DC side are adopted to reduce the ripple effect. In this paper, an analytical model of the ripple phenomenon is derived and analyzed in the frequency domain, and a ripple control scheme compensating the slip frequency of rotor vector control systems without a hardware filter is applied to reduce the torque and current ripple amplitude. Then a relatively simple discretization method is chosen to discretize the algorithm with a high discrete accuracy. Simulation and experimental results validate the proposed ripple control strategy.

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

  • Cho, Hyogeun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.22 no.4
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    • pp.145-151
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    • 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.

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

  • Yun, Kyungcheol;Yong, Geejoong
    • Journal of Auto-vehicle Safety Association
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    • v.11 no.1
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    • pp.48-54
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    • 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.

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

  • Hwang, Ui-Jun;Hur, Jang-Wook
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.19 no.11
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    • pp.58-63
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    • 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.

A study on the Development of an electronic control unit using digital sensors for propulsion systems (디지털센서를 이용한 추진 시스템 전자 제어장치 연구)

  • Son, Jong-Dae;Kim, Jung-Hoe;Lee, Jae-Yun;Kim, Tae-Wan;Yoon, Soo-Hee;Lee, Yong-Hwan;Kwak, Geunn-Yeong;Chung, Soon-Bae
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.167-169
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    • 2010
  • Electronic control units for propulsion systems are devices which compute control algorithm by processing the systems' internal sensor signals. Due to the effect of transmission between sensors and a control unit, previous analog systems have drawbacks of signal attenuation and susceptibility to noises. However, a digital sensor can be less influenced by the electrical cable line as it includes sensor, AMP, and AD converter in one module. In addition, it can reduce the process time for control algorithm because extra S/W filtering process is not needed. The current study shows how to process signals for an electronic control unit using digital sensors.

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Study on the Characteristics of Control by High Frequency ECU for Braking System (제동 시스템을 위한 고주파수 ECU의 제어 특성 연구)

  • Yeon, Kyu-Bong;Chong, Jong-Wha
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.6
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    • pp.2428-2434
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    • 2012
  • This paper describes the control of a solenoid valve of ESC(Electronic Stability Control) with hydraulic modulator in braking system. ESC ECU(Electronic Control Unit) to control the high-frequency control and slope control method was applied, the surge pressure and EMI(electromagnetic interference) reduction characteristics were studied. The stage of ECU output was added the slope shaping function to reduce electromagnetic emission at higher frequencies. Measurements show that this high frequency ECU manages to reduce the surge pressure and electromagnetic emission by the control of solenoid valve. In conclusion, by using the results of this study for the high frequency ECU control, we could expect enhancement of braking system performance.

Auxiliary Power Unit Control Algorithm for Input Voltage Disturbance Suppression (입력 급변 대응을 위한 철도 차량용 보조전원장치 외란 억제 알고리즘 구현)

  • Kim, Ji-Chan;Baek, Seoung-Gil;Cha, Hanju
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.12
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    • pp.1810-1817
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    • 2015
  • The railway vehicle has an auxiliary power unit for supplying power to the associated electronic control devices and passenger service unit. Typically, input voltage from the catenary for rolling stock is highly fluctuating according to the substation capacity, vehicle propulsion and regeneration. Especially, the frost and freezing on contact wire in winter can cause a blackout inside vehicle, and also brings about electronic components damaging and the system down. To prevent this problem, a large filter and capacitor is used. But this is not a perfect solution, because it is increasing weight of the unit. In this paper, a new algorithm is proposed to suppress the disturbance without adding devices. Simulation and experimental results show that the proposed algorithm has performance to suppress the disturbance at the sudden input voltage variations.

FPGA-based Centralized Controller for Multiple PV Generators Tied to the DC Bus

  • Ahmed, Ashraf;Ganeshkumar, Pradeep;Park, Joung-Hu;Lee, Hojin
    • Journal of Power Electronics
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    • v.14 no.4
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    • pp.733-741
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    • 2014
  • The integration of photovoltaic (PV) energy sources into DC grid has gained considerable attention because of its enhanced conversion efficiency with reduced number of power conversion stages. During the integration process, a local control unit is normally included with every power conversion stage of the PV source to accomplish the process of maximum power point tracking. A centralized monitoring and supervisory control unit is required for monitoring, power management, and protection of the entire system. Therefore, we propose a field-programmable gate array (FPGA) based centralized control unit that integrates all local controllers with the centralized monitoring unit. The main focus of this study is on the process of integrating many local control units into a single central unit. In this paper, we present design and optimization procedures for the hardware implementation of FPGA architecture. Furthermore, we propose a transient analysis and control design methodology with consideration of the nonlinear characteristics of the PV source. Hardware experiment results verify the efficiency of the central control unit and controller design.

Design of FIR System and Hilbert Transformer Having Ability of Selecting Filter Length (필터 Length를 가변할 수 있는 FIR 디지털 필터 및 힐버트 변환기의 설계)

  • Kim, Se-Jung;Hwang, Ho-Jung
    • Proceedings of the KIEE Conference
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    • pp.567-570
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    • 1988
  • This paper describes the design of FIR filtering DSP-chip that can be operated without programming. The proposed DSP-chip has not only the improvement of execution time but also selectivity of filter length from N=1 to N=128. Hilbert Transformer can be designed from this chip. FIR filter system is composed of Data memory/Control Unit, external memory and multiplier-accumulator. Data memory/Control Unit is laid out in this paper.

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