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RISS 인기검색어
- 검색키워드
- 주제어 : Clutch fill control(클러치 충전 제어) (검색결과 5 건)
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적응형 피드-포워드 제어 기법을 이용한 습식 듀얼 클러치 변속기의 유압 클러치 충전 제어기 설계
정상훈(Sanghun Jung),최세범(Seibum B. Choi),김진성(Jinsung Kim),이호영(Hoyoung Lee),고영호(Youngho Ko) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
본 논문은 습식 DCT에 적용되는 유압 클러치의 새로운 충전 제어 기법을 제안한다. 습식 DCT는 습식 클러치의 큰 드래그 토크로 인하여 정밀한 사전 충전 제어가 어려우며, 클러치 피스톤이 움직이는 충전 구간 제어 기술이 필수적으로 요구된다. 본 논문에서는 충전 구간을 보상 해주기 위해 여러 실용적인 문제를 고려한 감소 차수 모델을 제안한다. 제안된 감소 차수 모델은 유압 시스템의 충전 구간을 사실적으로 묘사한다. 제안된 감소 차수 모델은 충전 구간을 보상하는 피드-포워드 제어기를 구성하는데 이용된다. 피드-포워드 제어기는 모델 정보를 내포하기 때문에 다양한 입력에 맞춰 제어 출력을 생성하게 된다. 하지만, 유압 시스템의 여러 불확실성 및 외란으로 인해 감소 차수 모델의 변수가 변화하는 경우, 이에 대한 대응이 필요하게 된다. 본 논문에서는 측정된 클러치 내부 압력을 이용하여 모델의 변수를 실시간으로 업데이트 하는 적용형 피드-포워드 제어기를 제안한다. 제안된 제어기는 정확한 시뮬레이션 모델을 이용하여 검증되었다. 시뮬레이션 결과는 제안하는 제어기가 다양한 입력 상황 및 모델 변수의 변화에도 좋은 성능을 나타냄을 보여준다.
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정규홍(G. H. Jung),박동훈(D. H. Park) 유공압건설기계학회 2014 드라이브·컨트롤 Vol.11 No.3
Clutches are an integral part of the automatic transmission for changing gears. Modern automatic transmissions make extensive use of wet multiple-disc clutches employing hydraulic actuation mechanism with electronic control. Although nowadays, highly advanced shifting algorithm implements the superior shift quality and transmission efficiency, its performance should be based on smooth, reliable engagement with a reasonably durable friction material as well as stable clutch piston dynamics. Particularly, clutch filling control is the crucial part of shifting process because only the open-loop control is available due to the lack of measurement. In this paper, the effect of clutch-fill control parameters on clutch piston dynamics is experimentally investigated by using clutch piston test equipment which enables the clutch piston to actuate similar to real shifting conditions. The experimental analysis results can be expected to be utilized for the calibration of proportional solenoid valve as reference current profile data in vehicle test.
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정규홍(G. H. Jung),정창도(C. D. Jung),박세하(S. H. Park) 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.6
There are two types of automatic transmissions adopted in agricultural vehicles like a tractor. One is hydrostatic transmission and the other is conventional meshed gear type transmission which is typically high powered tractors are equipped with. The shifting process of gear type transmission is divided into three pahses which are the clutch filling pahse, torque pahse and inertia phase. Even though highly advanced digital control technologies are applied to improve the shift quality, optimal calibration of shift data during clutch filling phase is still a challenging work because only the open-loop control is applicable. This paper deals with the reasonable calibration method of clutch fill shift data by using clutch test functions those are implemented in TCU under development. The field test shifting results, which are obtained with the calibrated shift data from the proposed method during clutch filling pahse, show stable performance of the engaging clutch.
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자동변속기 변속품질 향상을 위한 클러치 자동보정 알고리즘 개발
정규홍 사단법인 유공압건설기계학회 2020 드라이브·컨트롤 Vol.17 No.3
As a shift control of automatic transmission was managed with the electronic control unit (ECU), shift quality which is a measure of shift shock during gear change has markedly improved. However, the initial clutch pressure control of the clutch filling phase should continue to rely on the predetermined control input since the input and output speeds are unchanged until the shifting process attains the inertia phase. It is critical to minimize the clutch response time and control the clutch pressure accurately at the end of clutch fill to achieve quick shift response and smoothness. Advanced transmission companies have adopted an auto calibration method which establishes the databases for the clutch piston fill-up attributes and the frictional characteristics of the disks. In this study, a distinctive auto calibration algorithm for forklift transmission under development is proposed and verified with the real-vehicle test. The experimental calibration results showed consistent turbine dynamics at the initial stage of shifts with the properly calibrated clutch-fill control parameters. By using this technique, it is necessary to finalize the shift control for the various operation conditions.
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정규홍(G. H. Jung) 유공압건설기계학회 2020 유공압건설기계학회 학술대회논문집 Vol.2020 No.7
As a shift control of automatic transmission was managed with electronic control unit(ECU), shift quality which is a measure of shift shock during gear change has been improved considerably. However initial clutch pressure control for the clutch filling phase should rely on the predetermined control input since the input and output speeds are not changed until shifting process reaches to inertia phase. It is critical to minimize the clutch response time and control the clutch pressure accurately at the end of clutch fill in order to realize quick shift response and smoothness. Advanced transmission companies already adopted an auto calibration methods which establishes the databases for clutch piston fill-up attributes and frictional characteristics of disks. In this research, a distinctive auto calibration algorithm for forklift transmission that is under development is proposed and verified with the real-vehicle test. Experimental calibration results showed consistent turbine dynamics at the initial stage of shifts with properly calibrated clutch-fill control parameters. By using this technique, it is necessary to finalize the shift control for various operation conditions.
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