2 stage CVT의 변속 제어 알고리즘에 대한 연구

다국어 초록 (Multilingual Abstract)

In this study, a 2 stage CVT shift control algorithm was proposed. First, 2 stage CVT shift performance simulator was developed based on dynamic models of the 2 stage CVT powertrain. The pressure control valves of the 2 stage CVT hydraulic control system were modeled as a second order system based on experiment results and validated by comparing the simulation results with the experiment results. A CVT variator model was obtained based on the CVT variator shift experiments and validated by the experiment results. The validated pressure control valves and CVT variator model were applied in the 2 stage CVT shift performance simulator.
The 2 stage CVT shift control algorithm was proposed for upshift, kickdown shift and lift foot up shift and performances of the proposed shift control algorithm was investigated using the 2 stage CVT shift performance simulator. For the upshift, the driveshift torque variation after the inertia phase was reduces by controlling the desired CVT variator ratio to maintain the actual CVT variator ratio after the inertia phase. To reduce a driveshaft peak to peak torque during 2 stage CVT upshift, a compound planetary gear ratio control was additionally applied. For the kickdown shift, an acceleration performance and a shift response speed would be improved by increasing a variator shift speed. In addition, the driveshift torque variation was reduced by controlling the desired variator ratio. For the lift foot up shift, the driveshift torque variation could be decreased by controlling a rapid change of the desired variator ratio using a first order delay function.
Experimental analyses were carried out to evaluate the performance of 2 stage CVT shift control algorithm for the upshift. It was found that the driveshift torque variation after the inertia phase did not occur by applying a proposed variator control algorithm.

목차 (Table of Contents)

• 목 차
• * List of figures and tables
• 제 1 장 서 론
• 1.1 연구 배경 1
• 1.2 기존 연구 8
• 1.3 연구 목적 11
• 제 2 장 2 stage CVT 동력전달계 모델링 및 변속성능 시뮬레이터 개발
• 2.1 2 stage CVT 동력전달계 모델링 12
• 2.1.1 엔진 14
• 2.1.2 토크컨버터 17
• 2.1.2 배리에이터 19
• 2.1.4 복합유성기어 20
• 2.1.5 클러치/브레이크 24
• 2.1.6 차량모델 25
• 2.2 2 stage CVT 변속성능 시뮬레이터 개발 26
• 제 3 장 2 stage CVT 유압 제어 시스템 성능시험 기반의 밸브 모델링 및 배리에이터 모델 검증
• 3.1 2 stage CVT 유압제어 시스템 성능 시험 장치 29
• 3.1.1 구동 시스템 29
• 3.1.2 2 stage CVT 33
• 3.1.3 오일펌프 모듈 33
• 3.1.4 센서 및 운용 시스템 모듈 36
• 3.1.5 회전 관성 및 부하 시스템 36
• 3.2 2 stage CVT 유압 제어시스템 성능시험 및 밸브 모델링 38
• 3.2.1 라인압력 밸브의 압력 특성 분석 및 밸브 모델링 43
• 3.2.2 구동풀리 압력 밸브의 압력 특성 분석 및 밸브 모델링 51
• 3.2.3 종동풀리 압력 밸브의 압력 특성 분석 및 밸브 모델링 54
• 3.2.4 직접솔레노이드 밸브의 압력 특성 분석 및 밸브 모델링 57
• 3.3 배리에이터 모델 도출 61
• 제 4 장 2 stage CVT 변속 제어 알고리즘 개발
• 4.1 2 stage CVT 복합유성기어 변속조건 69
• 4.2 2 stage CVT power on upshift 71
• 4.3 2 stage CVT kick-down shift 82
• 4.4 2 stage CVT lift foot up shift 98
• 제 5 장 2 stage CVT 변속 알고리즘 성능 시험
• 5.1 2 stage CVT 변속 제어 알고리즘 성능 시험 방법 101
• 5.2 2 stage CVT 상향변속 제어 알고리즘 성능 시험 101
• 제 6 장 결 론 109
• 참고문헌 112
• ABSTRACT 115
• 부 록 117