트랙터 자동변속기 되먹임 변속 제어기 설계

정규홍(Gyu Hong Jung),정창도(Chang Do Jung),박세하(Se Ha Park) 유공압건설기계학회 2016 드라이브·컨트롤 Vol.13 No.1

Nowadays automatic transmission equipped vehicles prevail in construction and agricultural equipment due to their convenience in driving and operation. Though domestic vehicle manufacturers install imported electronic controlled transmissions at present, overseas products will be replaced by domestic ones in the near future owing to development efforts over the past 10 years. For passenger cars, there are many kinds of shift control algorithms that enhance the shift quality such as feedback and learning control. However, since shift control technologies for heavy duty vehicles are not highly developed, it is possible to improve the shift quality with an organized control method. A feedback control algorithm for neutral-into-gear shift, which is enabled during the inertia phase for the master clutch slip speed to track the slip speed reference, is proposed based on the power transmission structure of TH100. The performance of the feedback shift control is verified by a vehicle test which is implemented with firmware embedded TCU. As the master clutch engages along the predetermined speed trajectory, it can be concluded that the shift quality can be managed by a shift time control parameter. By extending the proposed feedback algorithm for neutral-into-gear shift to gear change and shuttle shift, it is expected that the quality of the shift can be improved.

학습제어를 이용한 지게차 자동변속기 상향 변속품질 개선

정규홍 사단법인 유공압건설기계학회 2022 드라이브·컨트롤 Vol.19 No.2

Recently, automatic transmissions caused a good improvement in the shift quality of a forklift. An advanced shift control algorithm, which was based on TCU firmware, was applied with embedded control technology and microcontrollers. In the clutch-to-clutch shifting, one friction element is released and the other friction element is activated. During this process, if the release and application timings are not synchronized, an overrun or tie-up occurs and ultimately leads to a shift shock. The TCU, which measures only the speed of the forklift, inevitably applies the open-loop shift control. In this situation, the speed ratio does not change during the clutch fill. The torque phase occurs until the clutch is disengaged. In this study, an offline shift logic of the learning control was proposed. It induced a synchronous shift when the learning control progressed. During this process, the reference current trajectory of the release clutch was corrected and applied to the next upshift. We considered the results of the overrun/tie-up characteristics of the upshift performed immediately before. The vehicle test proved that the deviation in shift quality, which was caused by the difference in the mechanical characteristics of the clutch, could be improved by the learning control.

학습제어를 이용한 지게차 자동변속기 상향변속품질 개선

정규홍(G. H. Jung),이호준(H. J. Lee),김광인(K. I. Kim) 유공압건설기계학회 2021 유공압건설기계학회 학술대회논문집 Vol.2021 No.11

Recently, automatic transmissions realize good shift quality by implementing advanced shift control algorithms in TCU firmware using embedded control technology with microcontrollers. In clutch-to-clutch shifting in which one friction element is released and the other friction element is activated, if the release and apply timings are not synchronized, shift shock occurs due to overrun or tie-up. The TCU, which measures only the speeds, inevitably applies the open-loop shift control because the speed ratio does not change during the clutch fill and torque phase until the clutch is disengaged. In this study, an offline shift logic of learning control is proposed. It induces synchronous shifting as learning progresses by correcting the reference current trajectory of the release clutch applied to the next upshift based on the results of the overrun/tie-up characteristics of the upshift performed immediately before. The vehicle test proved that the shift quality deviation caused by the difference in the mechanical characteristics of the clutch can be improved by the learning control.

자동변속기 변속 제어 베이스 유압 모델 개발

김정래(Jeongrae Kim),김태준(Teajun Kim),배수용(Suyong Bae),황승민(Seongmin Hwang),이도희(Dohee Lee) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11

Automatic transmission is convenient for drivers to drive. Because of fuel economy regulations and , recognition about pollution, Many kinds of Multi-Step Automatic Transmissions are developed. This study has developed an optimal shift control parameter calculation model for automatic transmission. It was carried out for the purpose of quickly developing the TCU shift control base hydraulic data(TCU ROM). As part of the first study, we investigated the torque on the output side and the optimum shifting time of the 8-speed automatic front wheel. Analysis on this survey data can predict responsiveness and shifting. The second study constructed the optimal(ideal) hydraulic model of the control parameters at the shifting time using the automatic transmission hardware specification. Finally, the model were simulated in Matlab Simulink to prove the validity of the development results, and the reliability of the model was finally verified by applying it to a test vehicle. As a result, the precision and robustness of the TCU shift hydraulic pressure value was verified using the shift control parameter calculation model. In addition, it is possible to shorten the overall development schedule through the rapidity of the TCU base ROM production.

전기자동차용 Clutchless 변속기의 변속 제어 방법

김한솔(Hansol Kim),최우석(Woo-Seok Choi),조용진(Yongjin Cho),임원식(Wonsik Lim) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6

최근 전기자동차의 보급이 확대되고 있으며, 전기자동차의 시장점유율은 지속해서 확대될 것으로 예측되고 있다. 전기자동차는 일반적으로 변속기 없이 단일기어 감속비로만 구성되고 있지만, 다양한 주행 부하 조건을 극복하기 위한 전기자동차 전용 변속기 개발이 활발히 이루어지고 있다. 전기자동차 전용 변속기는 효율을 높이기 위해 일반적인 마찰 클러치가 적용되지 않고, 도그 클러치나 싱크로 장치만으로 구성되고 있다. 변속 시 동력원과 변속기가 분리되지 않아 관성이 큰 모터 축에 의해 부품에 충격이 발생할 수 있으며, 도그 클러치의 경우 속도 동기화 장치가 없으므로 체결이 이루어지지 않는 보킹 현상이 발생할 수 있다. 따라서 클러치가 없는 전기자동차 전용 변속기를 제어하기 위한 제어 전력에 관한 연구가 필요하다. 본 논문에서는 2모터가 적용되어 있고, 각각 모터에 별도의 2단변속기가 적용된 전기 자동차 전용 4단변속기 시스템의 제어전략에 대에 연구하였다. 변속장치는 도그 클러치가 적용되어 있으며, 도그 클러치의 보킹을 최소화하기 위한 속도 제어 특성에 대해 분석하였다. 또한, 모터의 높은 이너셔로 인해 변속 시 도그 클러치가 파손되거나 변속 충격이 발생할 수 있으므로 이를 방지하기 위한 제어 전력을 고안하였다. 변속 과도구간에서 토크 단절감을 최소화하기 위해, 변속 중 출력 축 토크를 일정하게 유지하기 위한 2모터 토크 제어 전략을 도출하였으며, 변속 시 변화하는 기어비에 따라 모터의 속도를 제어할 수 있는 속도제어 전략을 도출하였다. 이를 통해 변속 중 토크 단절감과 충격 없는 변속이 가능한 것을 확인하였다.

자동변속기 변속 제어 개념 개발을 위한 회전 동역학 해석

공진형(Jinhyung Kong),장욱진(Wook Jin Jang) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5

In order to improve shift quality and fuel efficiency of passenger cars with automatic transmission(A/T), the number of gear steps has been developed to increase; and we have also developed the 8-speed A/T. Since the newly developed A/T has a different arrangement of planetary gear trains or clutches, its performances should be carefully investigated at the conceptual design stage to avoid facing structural problem after completion of the conceptual or layout design. In this study, the governing equations for torsional dynamics of A/T were derived and solved to be a solution set in matrix form. With this solution set of torsional dynamics, we proposed the useful methods for developing control logic of A/T. For example, the control strategy of 4-elements shift(a.k.a. double swap shift) was proved to form a unique way; and the minimal pressure level of the clutch which maintains engagement during shift was analyzed.

이중 클러치의 변속기구 제어 시스템 개발

이정우(LEE Jeong-Woo) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.5

This paper describes the process of developing shift mechanism controller for use in dual clutch transmissions. The shift mechanism is characterized by one degree of freedom(single motor) with circular cam, whereas conventional shift mechanisms use dual motors for shift and select motion. We developed dynamic models of shift mechanism with one degree of freedom. And we developed controllers and motor drivers for shift mechanism. Through numerous experiments, we realize shift time below 0.2sec with Luk type synchronizer. And shift time about 0.355sec is realized for skip shift. the system will be combined with dual clutch controller, and commercialization process is in progress.

자동변속기 클러치 충전영역 변속 데이터 보정기법

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.

변속제어 알고리즘을 적용한 휠로더 자동변속기 특성 해석

오주영(Joo-young Oh),윤웅권(Ung-Kwon Yun),박영준(Young-Jun Park),이근호(Geun-Ho Lee),송창섭(Chang-Seop Song) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.5

Wheel-loader is a construction vehicle for uploading soil or sand into truck and transportation of materials, which requires large driving power and high rotational speed. To improve the working efficiency, the operator has to shift gears and control levers for bucket & boom simultaneously. Therefore, the automatic transmission has been introduced to enhance operator’s convenience and enable effective operation. To develop the automatic transmission for the wheel-loader, technologies such as gears and a clutch-pack design and shift algorithm are required for improvement of shift quality. In this paper, the shift algorithm for the wheel-loader was developed and its shift pattern was analyzed. As the shift control is affected by the pressure profile for the clutch control, the shift quality depending on the pressure profile has been evaluated using experiment and simulation model analysis.

휠로더 자동변속기 시뮬레이터 개발

정규홍,신상호,이승일 사단법인 유공압건설기계학회 2007 드라이브·컨트롤 Vol.4 No.2

TCU is a shift controller for automatic transmission of which major functions are to determine the shift point and manage the shifting process based on the various input signals. As the recent digital control technologies advance, it plays a key-role to improve a transmission performance and its algorithm becomes more complicated. This paper describes the development of transmission simulator for wheel loader that enables a TCU for normal stand-alone operation by the real-time emulation of TCU interface signals. It can be utilized for the analysis of shift control algorithm implemented in a commercial TCU as well as for the development of brand new TCU.