• Title, Summary, Keyword: Active Hood

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An active system for unnecessary noise reduction in kitchen range hoods

  • Kim, Eunhee;Jang, Jaechun;Lim, Changmok
    • Journal of the Korea Society of Computer and Information
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    • v.21 no.3
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    • pp.91-96
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    • 2016
  • We have surrounded undesired living noises in our life. One of biggest noises coming out of range hood during cooking in the kitchen. A range hood is one of the most important appliances in the kitchen because it ventilates polluted air out during cooking, and maintains air quality in the kitchen. But current kitchen range hoods bring up some issues; First, the range hoods consume massive amount of standby power not in use condition. Second, current models have designed manual fan operating system with sudden onset of noise with starting. In this paper, we propose an auto control system entire processes from air ventilation to noise reduction. Our system is consist of three parts (Eco-sensors pack, Main Controller and Active Noise Controller); Eco-sensors pack detects air pollution of kitchen areas and sends the detection values to Main Controller. Main Controller determines operation of range hood by detected values. Active Noise Controller is located inside of the range hood. It received starting signals from Main Controller which elicits degrees of polluted air condition and fan operating speed from 1 to 3. Once Active Noise Controller detected the signals, it runs a ventilating fan until new value from Main Controller becomes 0. while the range hood works, A noise cancellation algorithm inside of Active Noise Controller become activated to reduce levels of noise. As a result, the proposed system clearly shows reduction in power consumption include standby power and decreases in levels of noise.

Design of the Active Hood Lift System Using Orthogonal Arrays (직교배열표를 이용한 액티브 후드 리프트 시스템의 설계)

  • Shin, Moon-Kyun;Park, Kyung-Taek;Lee, Keun-Bae;Bae, Han-Il;Park, Gyung-Jin
    • Transactions of the Korean Society of Automotive Engineers
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    • v.14 no.4
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    • pp.123-131
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    • 2006
  • The majority of pedestrian fatalities and injuries are caused by vehicle-pedestrian accidents. Recently, it has been recognized as a serious problem. Injuries of occupants in a vehicle have been decreased considerably. However, efforts for protection of pedestrians are still insufficient. These days, many advanced industries are striving for a better protection of pedestrians by using an active hood lift system, rather than reforming the existing structure. In this research, the active hood lift system is designed to enhance the performance for protection. The active hood lift system is analyzed by using the nonlinear finite element method. An optimization problem is formulated by incorporation of the analysis results. Orthogonal arrays are utilized to solve the formulated problem. An iterative optimization algothrithm using orthogonal arrays is utilized for design in the discrete space. It is found that the method can remarkably decrease the number of function evaluations.

Performance Analysis of an Active System for Pedestrian Protection Using Impact Analysis (충돌 해석을 이용한 능동형 보행자 보호 시스템의 성능 분석)

  • Park, Jong-Sun;Jeong, Seong-Boem;Yun, Yong-Won;Park, Gyung-Jin
    • Transactions of the Korean Society of Automotive Engineers
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    • v.21 no.6
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    • pp.100-107
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    • 2013
  • Although automotive safety technologies have been developed steadily, the efforts for pedestrian protection still seems to be insufficient. In a car-pedestrian accident, the structures such as the engine under a hood, the lower part of a windshield and the A-pillar are the major causes of fatal pedestrian injuries. Recently, there have been several studies on the active safety system to reduce the pedestrian injuries. The safety system consists of an active hood lift system and a pedestrian airbag. In this research, the safety performance of the active hood lift system and the pedestrian airbag is investigated by using the finite element method. The finite element model of the system is set up based on the head impact test, and the impact analyses are performed. The necessity and the usefulness of the safety system are verified.

Effectiveness of Active Hood and Pedestrian Protection Airbag Based on Real Vehicle Impact Test (실차평가시험을 기반으로 한 액티브 후드 및 보행자 보호 에어백 효과)

  • Yun, Yong-Won;Park, Gyung-Jin;Kim, Tai-Kyung
    • Transactions of the Korean Society of Automotive Engineers
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    • v.22 no.1
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    • pp.36-45
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    • 2014
  • Pedestrian to vehicle traffic accidents show a very high mortality rate compared to the frequency of occurrence. In order to improve the pedestrian protection performance of the vehicle, the korean government added a "pedestrian safety" entry from the year 2007. The performance for pedestrian protection of current vehicles gradually improved compared to the past, but it is still insufficient. It was found that the pedestrian protection performance was very weak, such as the top of the bonnet, the A-pillar and under the front windshield. A application of an active hood and pedestrian protection airbags can be countermeasures for these weak points of pedestrian safety. The active hood and pedestrian protection airbags are designed and manufactured to apply to the top of the hood and to the bottom of the windshield. The manufactured system is equipped in a test vehicle and evaluated based on the Korea New Car Assessment Program(KNCAP) test procedures for the performance of pedestrian safety. As a result, the outstanding effect of pedestrian protection has been achieved by the active hood and the pedestrian protection airbag. The rates of pedestrian injury are reduced by 82.2% and 95.4%, respectively.

Assessing the Safety Benefit of an Advanced Vehicular Technology for Protecting Pedestrian(Focused on Active Hood Lift System (AHLS)) (첨단안전차량 효과분석(보행자보호를 위한 Active Hood Lift System (AHLS)을 중심으로))

  • O, Cheol;Gang, Yeon-Su;Kim, Beom-Il;Kim, Won-Gyu
    • Journal of Korean Society of Transportation
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    • v.24 no.3
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    • pp.95-102
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    • 2006
  • This study develops a methodology on how to assess the traffic safety benefit of advanced vehicular technology for Protecting pedestrian in pedestrian-vehicle collision. Safety benefit is defined here as the reduction of Pedestrian fatality by employing advanced vehicular technology. As an application of the proposed methodology the safety benefit of active hood lift system (AHLS) is assessed. Both actual accident data analysis and simulation experiment are conducted to establish statistical models that are used for estimating the reduction of pedestrian fatality It is believed that the developed methodology and outcomes would be greatly useful in developing various advanced vehicular technologies and establishing more effective traffic safety policies.

A Study on Deploying Time of Active Hood Lift System of Passenger Vehicles with Principal Design Parameters (중요 설계변수에 따른 승용차 능동후드리프트 시스템의 전개시간 연구)

  • Lee, Tae-Hoon;Yoon, Gun-Ha;Choi, Seung-Bok
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.26 no.1
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    • pp.63-68
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    • 2016
  • This research investigates the deployment time of an active hood lift system(AHLS) activated a gunpowder actuator for the passenger vehicle. The deployment time of the system is investigated by changing the principal design parameters of the system. In order to achieve this goal, after introducing the geometric structure and operating principle of the AHLS, the dynamic equations of the system are formulated for deploying motion. Subsequently, using the dynamic equations, the deployment time of the system is determined by changing several geometric design parameters such as location of actuator. It is then identified which design parameters are main factors to affect the deployment time of AHLS.

Experimental Evaluation of Deployment Time of Active Hood Lift System According to Structural Improvement (능동후드리프트 시스템의 구조 설계에 따른 전개시간의 실험적 평가)

  • Lee, Tae-Hoon;Yoon, Gun-Ha;Park, Chun-Yong;Kang, Je-Won;Choi, Seung-Bok
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.26 no.3
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    • pp.265-269
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    • 2016
  • In this research, the performances of active hood lift system(AHLS) are investigated according to the structural improvement through the experimental test. After introducing the working principle of the AHLS activated by a gunpowder actuator, the structural problems that cause the inefficiencies in the actuation are analyzed to reduce the deployment time of system. Sequentially, the improved structural model is proposed base on the analysis. The deployment time of AHLS are evaluated by the experimental test, and it has been identified that the improved model can provide a faster deploying time of AHLS.

Performance Evaluation of Active Hood Lift System of Passenger Vehicles with Different Operating Method (승용차 능동후드리프트 시스템의 전개 방식에 따른 성능 평가)

  • Lee, Tae-Hoon;Yoon, Gun-Ha;Park, Chun-Yong;Kang, Je-Won;Choi, Seung-Bok
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.26 no.3
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    • pp.242-247
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    • 2016
  • This work investigates the performances of active hood lift system(AHLS) activated by two different operating methods through the experimental test. In the AHLS, the deployment time of the system and decrement of pedestrian injury are the most important factors for the pedestrian safety during the pedestrian-vehicle impact. After introducing the working principle of AHLS using spring actuator and gunpowder actuator, the deployment time of AHLS and decrement of pedestrian injury are evaluated by the experimental test. It has been identified that the gunpowder actuator can provide a faster deploying time of AHLS.

A failure diagnosis scheme for gunpowder type active hood system (화약식 액티브 후드 시스템 고장진단 기법)

  • Kang, Youk
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.76-79
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    • 2016
  • 자동차 산업의 발달과 전세계적으로 차량의 증가로 인해 보행자의 사고 발생율이 증가하고 있고 보행자의 안전에 대해 연구와 안전장비들이 계속적으로 개발되고 있다. 보행자와 차량의 충돌시 보행자의 상해를 감소시키는 시스템 중 화약식 액티브 후드 시스템(active hood system, AHS)은 부하가 화약성분이므로 부하의 성분을 검출하는데 한계가 있고, 위험성이 높으므로 정밀한 고장진단이 필요하다. 이러한 문제점을 해결하기 위해 화약의 부하저항을 측정하는 방법과 저항성 누설전류를 측정하는 방법을 제시하고, 이 방법을 점화회로의 이상 유무를 확인하는 고장진단 기법으로 제안한다. 그리고 고장진단시 squib가 점화되는 오동작을 방지하고저 고장진단 모드와 점화모드를 구별하여 진단전류와 점화전류를 구분하는 기법을 제안한다.