KR101013957B1 - Hydraulic control method of continuously variable transmission - Google Patents

Hydraulic control method of continuously variable transmission Download PDF

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KR101013957B1
KR101013957B1 KR1020040111356A KR20040111356A KR101013957B1 KR 101013957 B1 KR101013957 B1 KR 101013957B1 KR 1020040111356 A KR1020040111356 A KR 1020040111356A KR 20040111356 A KR20040111356 A KR 20040111356A KR 101013957 B1 KR101013957 B1 KR 101013957B1
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valve
control
pressure
clutch
continuously variable
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KR1020040111356A
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KR20060072659A (en
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김현석
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현대자동차주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F16H2061/1232—Bringing the control into a predefined state, e.g. giving priority to particular actuators or gear ratios
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F16H2061/1256—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected
    • F16H2061/126—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected the failing part is the controller

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Transmission Device (AREA)

Abstract

본 발명은 무단 변속기의 변속 제어부가 완전히 고장나는 경우에도 최소한의 운전성을 확보하기 위하여 발진 클러치를 제어할 수 있는 무단 변속기의 유압 제어 시스템에 관한 것으로, 변속 제어부(TCU)의 고장 여부를 검출하는 조건을 만족하는 경우 상기 변속 제어부의 고장(FAIL)으로 판단하고, 상기 발진 클러치를 엔진 회전수에 비례한 클러치 컨트롤 슬립(CLUTCH CONTROL SLIP) 제어로 구동시켜 차량을 발진시키며, 엔진 스톨(STALL)이면서 무단 변속기(CVT) 변속비가 풀 오버 드라이브(FULL OD)인 경우로서 세컨더리 컨트롤 솔레노이드 밸브 & 변속비 제어 솔레노이드 밸브(SCSV & RCSV) 압력이 동시에 최대(MAX)가 되는 경우 상기 변속 제어부(TCU)의 고장(FAIL)이 발생한 경우로 판단하고, 상기 세컨더리 컨트롤 솔레노이드 밸브 & 변속비 제어 솔레노이드 밸브(SCSV & RCSV)의 압력이 각각 최대(MAX)가 되었을 때 림프 홈 밸브(LIMP HOME VALVE)가 설정된 방향으로 이동되도록 림프 홈 밸브 스프링(LIMP HOME VALVE SPRING)을 설계하며, 발진 클러치 컨트롤 밸브(START CLUTCH CONTROL VALVE) 압력이 피토 레귤레이터 밸브(PITOT REGULATOR VALVE)로 공급되며 피토 레귤레이터 밸브(PITOT REGULATOR VALVE)는 세컨 레귤레이터 밸브(SECOND REGUALTOR VALVE) 압력에 비례하여 압력을 조절(REGULATING)하도록 구성한다.The present invention relates to a hydraulic control system of a continuously variable transmission that can control an oscillation clutch in order to secure minimum driving performance even when the transmission control unit of the continuously variable transmission completely fails. If the condition is satisfied, it is determined as a failure of the shift control unit, and the vehicle is started by driving the oscillating clutch by clutch control slip control in proportion to the engine speed, and is an engine stall. If the CVT transmission ratio is FULL OD and the secondary control solenoid valve & transmission ratio control solenoid valve (SCSV & RCSV) pressure simultaneously reaches maximum (MAX), the transmission control unit (TCU) fails ( FAIL) and the secondary control solenoid valve & speed ratio control solenoid valve (SCSV & RCSV) The LIMP HOME VALVE SPRING is designed so that the LIMP HOME VALVE moves in the set direction when the pressure reaches the MAX, respectively, and the START CLUTCH CONTROL VALVE pressure is It is supplied to the PITOT REGULATOR VALVE and the PITOT REGULATOR VALVE is configured to regulate the pressure in proportion to the pressure of the SECOND REGUALTOR VALVE.

무단 변속기, 유압, 제어, 발진 클러치Continuously variable transmission, hydraulic, control, oscillating clutch

Description

무단 변속기의 유압 제어 방법{HYDRAULIC CONTROL METHOD OF CONTINUOUSLY VARIABLE TRANSMISSION}HYDRAULIC CONTROL METHOD OF CONTINUOUSLY VARIABLE TRANSMISSION}

도 1은 종래 기술에 따른 무단 변속기(CVT)에 적용된 유압 회로도를 도시한 도면.1 shows a hydraulic circuit diagram applied to a CVT according to the prior art.

도 2는 본 발명의 실시예에 따른 무단 변속기의 유압 제어 시스템의 변속 제어부(TCU) 고장(FAIL) 시 작동 원리를 도시한 도면.
도 3은 엔진 회전속도(오일 펌프 회전속도)에 대한 솔레노이드 레귤레이터 밸브(SECOND REGULATOR VALVE) 압력에 대한 시험결과를 도시한 그래프.2 is a view showing the operating principle when the shift control unit (TCU) failure (FAIL) of the hydraulic control system of the continuously variable transmission according to an embodiment of the present invention.
Figure 3 is a graph showing the test results for the solenoid regulator valve (SECOND REGULATOR VALVE) pressure against the engine speed (oil pump rotation speed).

본 발명은 무단 변속기의 유압 제어 방법에 관한 것이다.The present invention relates to a hydraulic control method of a continuously variable transmission.

통상적으로, 변속 제어부(TCU)가 완전히 고장(FAIL)이 발생했을 때 최소한의 운전성을 확보하기 위하여 발진 클러치를 제어할 필요가 있다.In general, when the transmission control unit TCU completely fails (FAIL), it is necessary to control the oscillation clutch in order to ensure the minimum operability.

도 1은 종래 기술에 따른 무단 변속기(CVT)에 적용된 유압 회로도이며 변속 제어부(TCU) 고장(FAIL)시 유압 상태를 도시한 도면이다.1 is a hydraulic circuit diagram applied to a continuously variable transmission CVT according to the related art, and is a view illustrating a hydraulic state when a shift control unit TCU fails.

도 1을 참조하면, 시프트 컨트롤 리니어 솔레노이드(SHIFT CONTROL LINEAR SOLENOID)는 노멀 하이 타입(NORMAL HIGH TYPE)으로 변속 제어부(TCU)로부터 신호가 오프(OFF)되면, 시프트 컨트롤 압력(SHIFT CONTROL PRESSURE)은 최고(MAX) 압력 상태가 된다.Referring to FIG. 1, the shift control linear solenoid is a normal high type, and when the signal is turned off from the shift control unit TCU, the shift control pressure is the highest. (MAX) Pressure state.

컨트롤 압력(CONTROL PRESSURE)은 시프트 인히비터 밸브(SHIFT INHIBITOR VALVE)를 왼쪽으로 이동시켜 발진 클러치로 공급되는 유로를 피토 레귤레이터 밸브(PITOT REGULATOR VALVE)에서 공급되는 유로와 연결시킨다. The CONTROL PRESSURE moves the shift inhibitor valve to the left to connect the flow path to the oscillation clutch with the flow path from the PITOT REGULATOR VALVE.

그리고 피토 파이프(PITOT PIPE)에서는 엔진 회전수(RPM) 상승과 비례적으로 피토(PITOT) 압력을 상승시켜 결과적으로 엔진 회전수가 상승하면 발진 클러치 압력이 비례적으로 상승하게 된다.In the PITOT PIPE, the PITOT pressure is increased in proportion to the increase of the engine speed RPM, and as a result, the starting clutch pressure increases proportionally when the engine speed increases.

결과적으로 클러치가 슬립 제어되면서 차량이 발진할 수 있다.As a result, the vehicle can start while the clutch is slip-controlled.

시프트 컨트롤 리니어 솔레노이드(SHIFT CONTROL LINEAR SOLENOID)에서 발생되는 압력에 의하여 인히비터 밸브(INHIBITOR VALVE)를 왼쪽으로 이동시켜 발진 클러치 컨트롤 밸브(START CLUTCH CONTROL VALVE)에 의하여 제어되는 것을 피토 레귤레이터 밸브(PITOT REGULATOR VALVE)에 의하여 제어되도록 한다.PITOT REGULATOR VALVE is controlled by the START CLUTCH CONTROL VALVE by moving the INHIBITOR VALVE to the left by the pressure generated by the SHIFT CONTROL LINEAR SOLENOID. To be controlled.

따라서 유압 제어 설계시 시프트 컨트롤 리니어 솔레노이드(SHIFT CONTROL LINEAR SOLENOID)의 제어 영역 중 고압 제어 영역을 할당하여 설계할 필요가 있다.Therefore, when designing the hydraulic control, it is necessary to allocate and design a high pressure control area among the control areas of the shift control linear solenoid.

결과적으로 위와 같은 방법을 사용할 때 종래에는 시프트 컨트롤 리니어 솔레노이드(SHIFT CONTROL LINEAR SOLENOID)의 주목적인 시프트 밸브(SHIFT VALVE) 제어 영역이 축소되는 문제가 있다.As a result, when the above method is used, there is a problem in that the shift valve control region, which is the main purpose of the shift control linear solenoid, is reduced.

본 발명의 목적은 무단 변속기의 변속 제어부가 완전히 고장나는 경우에도 최소한의 운전성을 확보하기 위하여 발진 클러치를 제어할 수 있는 무단 변속기의 유압 제어 방법을 제공하는데 있다.SUMMARY OF THE INVENTION An object of the present invention is to provide a hydraulic control method of a continuously variable transmission that can control an oscillation clutch in order to secure minimum driving performance even when the transmission control unit of the continuously variable transmission completely fails.

상기와 같은 목적을 달성하기 위하여 본 발명은 발진 클러치를 장착한 무단 변속기의 유압 제어 시스템에 있어서, 변속 제어부(TCU)의 고장 여부를 검출하는 조건을 만족하는 경우 상기 변속 제어부의 고장(FAIL)으로 판단하고, 상기 발진 클러치를 엔진 회전수에 비례한 클러치 컨트롤 슬립(CLUTCH CONTROL SLIP) 제어로 구동시켜 차량을 발진시키며, 엔진 스톨(STALL)이면서 무단 변속기(CVT) 변속비가 풀 오버 드라이브(FULL OD)인 경우로서 세컨더리 컨트롤 솔레노이드 밸브 & 변속비 제어 솔레노이드 밸브(SCSV & RCSV) 압력이 동시에 최대(MAX)가 되는 경우 상기 변속 제어부(TCU)의 고장(FAIL)이 발생한 경우로 판단하고, 상기 세컨더리 컨트롤 솔레노이드 밸브와 변속비 제어 솔레노이드 밸브(SCSV & RCSV)의 압력이 동시에 최대(MAX)가 되었을 때 림프 홈 밸브(LIMP HOME VALVE)가 설정된 방향으로 이동되도록 림프 홈 밸브 스프링(LIMP HOME VALVE SPRING)을 설계하며, 발진 클러치 컨트롤 밸브(START CLUTCH CONTROL VALVE) 압력이 피토 레귤레이터 밸브(PITOT REGULATOR VALVE)로 공급되며 피토 레귤레이터 밸브(PITOT REGULATOR VALVE)는 세컨 레귤레이터 밸브(SECOND REGUALTOR VALVE) 압력에 비례하여 압력을 조절(REGULATING)하도록 구성하는 것을 특징으로 한다.In order to achieve the above object, the present invention, in the hydraulic control system of the continuously variable transmission equipped with the oscillation clutch, when the condition of detecting the failure of the shift control unit (TCU) is satisfied as the failure (FAIL) of the shift control unit. The vehicle is started by driving the clutch with clutch control slip control proportional to the engine speed, and the CVT transmission ratio with the engine stall is FULL OD. When the secondary control solenoid valve & speed ratio control solenoid valve (SCSV & RCSV) pressure at the same time (MAX) at the same time (MAX) is determined that a failure (FAIL) of the shift control unit (TCU) occurs, the secondary control solenoid valve LIMP HOME VALVE is installed when the pressures of the gear ratio and the gear ratio control solenoid valves (SCSV & RCSV) are at the same time MAX. LIMP HOME VALVE SPRING is designed to move in a fixed direction, START CLUTCH CONTROL VALVE pressure is supplied to the PITOT REGULATOR VALVE, and the PITOT REGULATOR VALVE The second regulator valve (SECOND REGUALTOR VALVE) is characterized in that configured to regulate the pressure in proportion to the pressure (REGULATING).

이하, 본 발명의 바람직한 실시예를 첨부한 도면을 참조하여 상세히 설명한다.
하기 설명 및 첨부 도면과 같은 많은 특정 상세들이 본 발명의 보다 전반적인 이해를 제공하기 위해 나타나 있으나, 이들 특정 상세들은 본 발명의 설명을 위해 예시한 것으로 본 발명이 그들에 한정됨을 의미하는 것은 아니다.
그리고 본 발명의 요지를 불필요하게 흐릴 수 있는 공지 기능 및 구성에 대한 상세한 설명은 생략한다.Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.
While many specific details, such as the following description and the annexed drawings, are shown to provide a more general understanding of the invention, these specific details are illustrated for the purpose of explanation of the invention and are not meant to limit the invention thereto.
And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

본 발명의 실시예는 발진 클러치를 장착한 무단 변속기(CVT)의 유압 제어 방법(Hydraulic Control Method)에 관한 것으로, 3단(Stage)의 엔진 속도에 따른 압력상승 유압특성을 이용하며, 별도의 피토 챔버(Pitot Chamber)와 피토 파이프(Pitot Pipe)가 필요 없는 방법이다.An embodiment of the present invention relates to a hydraulic control method of a CVT equipped with an oscillating clutch, and uses a pressure rising hydraulic characteristic according to an engine speed of three stages, and uses a separate pitot. There is no need for a Pitot Chamber and a Pitot Pipe.

변속 제어부(TCU)가 완전히 고장(FAIL)이 발생했을 때 최소한의 운전성을 확보하기 위하여 발진 클러치를 제어할 필요가 있다.When the transmission control unit TCU completely fails (FAIL), it is necessary to control the oscillation clutch in order to secure the minimum operability.

도 2는 본 발명의 실시예에 따른 무단 변속기의 유압 제어 시스템에서 변속 제어부(TCU) 고장(FAIL) 시 작동 원리를 도시한 것이다.2 is a view illustrating an operation principle when a shift control unit (TCU) fails in a hydraulic control system of a continuously variable transmission according to an exemplary embodiment of the present invention.

무단 변속기(CVT)에서 세컨더리 컨트롤 솔레노이드 밸브(SCSV ; Secondary Control Solenoid Valve) 압력이 최대(MAX)가 되는 경우는 벨트의 클램핑(CLAMPING)력이 가장 크게 필요한 스톨(STALL)시이다.In case of CVT, the secondary control solenoid valve (SCSV) pressure is the maximum (max) when the stall requires the most clamping force of the belt.

그리고 변속비 제어 솔레노이드 밸브(RCSV ; Ratio Control Solenoid Valve)의 압력이 최대(MAX)가 되는 경우는 풀 오버 드라이브(FULL OD)일 때이다.When the pressure of the ratio control solenoid valve (RCSV) reaches a maximum (MAX), it is a full overdrive.

따라서, 엔진 스톨(STALL)이면서 무단 변속기(CVT)의 변속비가 풀 오버 드라이브(FULL OD)인 경우는 정상적인 운전 상황에서는 존재할 수 없으며, 단지 변속 제어부(TCU)의 완전 고장(FAIL)이 발생하였을 때만 세컨더리 컨트롤 솔레노이드 밸브와 변속비 제어 솔레노이드 밸브(SCSV & RCSV, NORMAL HIGH TYPE)의 압력이 동시에 최대(MAX)가 될 수 있다.Therefore, if the transmission ratio of the engine stall and the CVT is FULL OD cannot be present in a normal driving situation, only when a complete failure of the transmission control unit TCU occurs. The pressure of the secondary control solenoid valve and the gear ratio control solenoid valves (SCSV & RCSV, NORMAL HIGH TYPE) can be at the same time MAX.

이 두 압력이 동시에 최대(MAX)가 되었을 때, 림프 홈 밸브(LIMP HOME VALVE)가 완전히 오른쪽으로 이동하도록 림프 홈 밸브 스프링(LIMP HOME VALVE SPRING)이 설계된다. When these two pressures are at their maximum (MAX) simultaneously, the LIMP HOME VALVE SPRING is designed so that the LIMP HOME VALVE moves completely to the right.

그러면, 발진 클러치 컨트롤 밸브(START CLUTCH CONTROL VALVE) 압력이 피토 레귤레이터 밸브(PITOT REGULATOR VALVE)로 공급되며, 피토 레귤레이터 밸브(PITOT REGULATOR VALVE)는 레귤레이팅 포인트(REGULATING POINT) 전에는 엔진 회전수(RPM)에 비례하여 압력이 조절되는 세컨 레귤레이터 밸브(SECOND REGUALTOR VALVE)에 의하여 제어된다.Then the START CLUTCH CONTROL VALVE pressure is supplied to the PITOT REGULATOR VALVE, and the PITOT REGULATOR VALVE is applied to the engine speed before the regulating point. It is controlled by a second regulator valve which is proportionally regulated.

결과적으로 발진 클러치(START CLUTCH)는 엔진 회전수에 비례한 클러치 컨트롤 슬립(CLUTCH CONTROL SLIP) 제어가 되면서 차량은 발진된다.As a result, the start clutch is controlled by the clutch control slip proportional to the engine speed and the vehicle starts.

도 3은 엔진 회전속도(오일 펌프 회전속도)에 대한 솔레노이드 레귤레이터 밸브(SECOND REGULATOR VALVE) 압력에 대한 대표적인 시험결과이다.3 is a representative test result for the SECOND REGULATOR VALVE pressure on the engine speed (oil pump rotation speed).

도 3을 참조하면, 세컨 레귤레이터 밸브(SECOND REGULATOR VALVE) 압력이 레귤레이팅 포인트(REGULATING POINT) 전에는 오일 펌프 회전속도에 어느 정도 비례하여 상승함을 알 수 있다. Referring to FIG. 3, it can be seen that the pressure of the second regulator valve rises in proportion to the rotation speed of the oil pump before the regulating point.

또한, 세컨 레귤레이터 밸브 어큐뮬레이터(SECOND REGULATOR VALVE ACCUMULATOR)를 적용하여 실제 피토 레귤레이터 밸브(PITOT REGULATOR VALVE)에 영향을 주는 압력은 시험결과보다는 완만할 것으로 예측된다.In addition, by applying a second regulator valve accumulator (SECOND REGULATOR VALVE ACCUMULATOR), the pressure affecting the actual PITOT REGULATOR VALVE is expected to be gentler than the test results.

상술한 바와 같이 본 발명에 따른 무단 변속기의 유압 제어 방법은 기존 시프트 컨트롤 리니어 솔레노이드 밸브(SHIFT CONTROL LINEAR SOLENOID VALVE) 제어 영역을 쓰던 것을 두 개의 세컨더리 컨트롤 솔레노이드 밸브와 변속비 제어 솔레노이드 밸브(SCSV & RCSV)의 두 개의 컨트롤 고압 영역을 사용하여 제어 영역이 기존 대비 우수하며, 제어 영역 감소가 최소화되어 제어성이 우수한 효과가 있다.As described above, the hydraulic control method of the continuously variable transmission according to the present invention uses the conventional shift control linear solenoid valve control area of two secondary control solenoid valves and a transmission ratio control solenoid valve (SCSV & RCSV). By using two control high-pressure zones, the control zone is superior to the existing ones, and the reduction of the control zone is minimized, so the controllability is excellent.

또한, 피토 파이프(Pitot Pipe)와 피토압을 만들기 위한 장치가 삭제되며, 부품 감소로 경량화 및 원가 절감의 효과가 있다.In addition, the pitot pipe (Pitot Pipe) and the device for making the pitot pressure is deleted, there is a light weight and cost reduction effect by reducing the parts.

Claims (1)

발진 클러치를 장착한 무단 변속기의 유압 제어 방법에 있어서,In the hydraulic control method of a continuously variable transmission equipped with an oscillating clutch, 변속 제어부(TCU)의 고장 여부를 검출하는 조건을 만족하는 경우, 상기 변속 제어부의 고장(FAIL)으로 판단하고, 상기 발진 클러치를 엔진 회전수에 비례한 클러치 컨트롤 슬립(CLUTCH CONTROL SLIP) 제어로 구동시켜 차량을 발진시키며, If the condition for detecting the failure of the shift control unit (TCU) is satisfied, it is determined as a failure of the shift control unit, and the oscillating clutch is driven by clutch control slip control in proportion to the engine speed. To start the car, 엔진 스톨(STALL)이면서 무단 변속기(CVT)의 변속비가 풀 오버 드라이브(FULL OD)인 경우로서 세컨더리 컨트롤 솔레노이드 밸브와 변속비 제어 솔레노이드 밸브(SCSV & RCSV)의 압력이 동시에 최대(MAX)가 되는 경우, 상기 변속 제어부(TCU)의 고장(FAIL)으로 판단하고,When the transmission ratio of the CVT and the engine stall is STALL and FULL OD, and the pressures of the secondary control solenoid valve and the transmission ratio control solenoid valve (SCSV & RCSV) become the maximum at the same time, Judging by the failure (FAIL) of the shift control unit (TCU), 상기 세컨더리 컨트롤 솔레노이드 밸브와 변속비 제어 솔레노이드 밸브(SCSV & RCSV)의 압력이 각각 최대(MAX)가 되었을 때, 림프 홈 밸브(LIMP HOME VALVE)가 설정된 방향으로 이동되도록 림프 홈 밸브 스프링(LIMP HOME VALVE SPRING)을 설계하여, 발진 클러치 컨트롤 밸브(START CLUTCH CONTROL VALVE)의 압력이 피토 레귤레이터 밸브(PITOT REGULATOR VALVE)로 공급되며, 피토 레귤레이터 밸브(PITOT REGULATOR VALVE)는 세컨 레귤레이터 밸브(SECOND REGUALTOR VALVE)의 압력에 비례하여 압력을 조절(REGULATING)하도록 이루어지는 것을 특징으로 하는 무단 변속기의 유압 제어 방법.When the pressure of the secondary control solenoid valve and the transmission ratio control solenoid valves (SCSV & RCSV) reaches the maximum (MAX), the lymph groove valve spring (LIMP HOME VALVE SPRING) is moved so that the lymph groove valve (LIMP HOME VALVE) moves in the set direction. ), The pressure of the START CLUTCH CONTROL VALVE is supplied to the PITOT REGULATOR VALVE, and the PITOT REGULATOR VALVE is connected to the pressure of the SECOND REGUALTOR VALVE. Hydraulic control method of a continuously variable transmission characterized in that it is made to adjust the pressure in proportion.
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