KR100302726B1 - Hydraulic control system of continuously variable transmission for vehicle - Google Patents
Hydraulic control system of continuously variable transmission for vehicle Download PDFInfo
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- KR100302726B1 KR100302726B1 KR1019990005882A KR19990005882A KR100302726B1 KR 100302726 B1 KR100302726 B1 KR 100302726B1 KR 1019990005882 A KR1019990005882 A KR 1019990005882A KR 19990005882 A KR19990005882 A KR 19990005882A KR 100302726 B1 KR100302726 B1 KR 100302726B1
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- valve
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 13
- 230000001105 regulatory effect Effects 0.000 claims abstract description 21
- 230000001276 controlling effect Effects 0.000 claims description 10
- 230000007257 malfunction Effects 0.000 abstract description 2
- 230000007935 neutral effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
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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
- F16H61/0021—Generation or control of line pressure
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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
- F16H61/0003—Arrangement or mounting of elements of the control apparatus, e.g. valve assemblies or snapfittings of valves; Arrangements of the control unit on or in the transmission gearbox
- F16H61/0009—Hydraulic control units for transmission control, e.g. assembly of valve plates or valve units
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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
- F16H61/02—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 characterised by the signals used
- F16H61/0202—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 characterised by the signals used the signals being electric
- F16H61/0251—Elements specially adapted for electric control units, e.g. valves for converting electrical signals to fluid signals
- F16H2061/026—On-off solenoid valve
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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
- F16H61/02—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 characterised by the signals used
- F16H61/0262—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 characterised by the signals used the signals being hydraulic
- F16H61/0276—Elements specially adapted for hydraulic control units, e.g. valves
- F16H2061/0279—Details of hydraulic valves, e.g. lands, ports, spools or springs
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Transmission Device (AREA)
Abstract
전진 주행중 운전자의 실수로 후진으로 변환이 이루어졌을 때 보다 안정된 안전회로를 구성하기 위하여;To construct a more stable safety circuit when the driver's mistake is converted to reverse during the forward driving;
오일펌프로부터 공급되는 유압을 조절하는 압력조절수단과, 변속제어수단과, 전,후진 제어수단과, 댐퍼 클러치 제어수단을 포함하여 이루어지되,Pressure control means for adjusting the hydraulic pressure supplied from the oil pump, shift control means, forward and reverse control means, and damper clutch control means,
상기 변속제어수단의 압력제어밸브와 댐퍼 클러치 제어수단의 댐퍼 클러치 밸브가 각각 솔레노이드 밸브에 의해 압력 조절수단으로부터 공급되는 유압을 감압시켜 공급하는 리듀싱 밸브압으로 제어되도록 하고, 매뉴얼 밸브로부터 후진압 마찰부재로 체결압을 공급하는 후진압 관로상에 상기 압력제어밸브가 작동불량으로 우측으로 스틱된 상태에서 D→R로 오조작시 강제로 후진 변속이 이루어지는 것을 방지하기 위한 안전밸브를 배치한 자동차용 무단 변속기의 유압 제어시스템을 제공한다.The pressure control valve of the shift control means and the damper clutch valve of the damper clutch control means are respectively controlled by the reducing valve pressure to reduce and supply the hydraulic pressure supplied from the pressure regulating means by the solenoid valve, and the reverse pressure friction from the manual valve. For a vehicle in which a safety valve is disposed on the reverse pressure pipeline for supplying the clamping pressure to the member to prevent the reverse shift from being forcibly made when D → R is misoperated with the pressure control valve sticking to the right due to a malfunction. Provides hydraulic control system for continuously variable transmissions.
Description
본 발명은 대한민국 특허 출원 제97 - 51970호(97.10.10)에 대한 개량 발명으로서, 전진 주행중 운전자의 실수로 후진으로 변환이 이루어졌을 때 보다 안정된 회로를 구성할 수 있도록 매뉴얼 밸브로부터 후진압 마찰부재로 체결압을 공급하는 후진압 관로상에 상기 압력제어밸브가 작동불량으로 우측으로 스틱된 상태에서 D→R로 오조작시 강제로 후진 변속이 이루어지는 것을 방지하기 위한 안전밸브를 배치하여 이루어지는 무단 변속기의 유압 제어시스템에 관한 것이다.The present invention is an improved invention of the Republic of Korea Patent Application No. 97-51970 (97.10.10), the reverse friction friction member from the manual valve to configure a more stable circuit when the driver accidentally converted to the reverse during the forward driving A continuously variable transmission comprising a safety valve disposed on the reverse pressure pipeline for supplying the fastening pressure to prevent the reverse shift from being forcibly made in the case of a misoperation from D to R while the pressure control valve is stuck to the right due to a malfunction. Of the hydraulic control system.
예컨데, 무단 변속기를 포함하는 자동변속기의 유압 제어시스템에 있어서는 운전자의 실수로 주행중 셀렉트 레버의 오조작으로 레인지 변환이 이루어지면 이에 대한 안전사고가 발생됨으로써, 각종의 안전회로를 구비하고 있는데, 그 일예로서, 전진중 후진으로 변속될 때, 급작스럽게 후진 마찰부재가 작동하는것을 방지하기 위한 안전수단을 구비하게 된다.For example, in the hydraulic control system of an automatic transmission including a continuously variable transmission, a safety accident occurs when a range change occurs due to an incorrect operation of a select lever while driving by a driver, thereby providing various safety circuits. As a result, when shifting to reverse while moving forward, safety means for preventing the reverse friction member from operating suddenly are provided.
그 일예로서, 상기 특허출원 제 97- 51970호의 유압 제어시스템은 오일펌프로부터 공급되는 유압을 조절하는 프라이머리 라인압 조절밸브와, 제1 솔레노이드 밸브와, 세컨들리 압력조절밸브와, 솔레노이드 서플라이 밸브로 이루어지는 압력조절수단과;As an example, the hydraulic control system of Patent Application No. 97-51970 is a primary line pressure regulating valve for regulating the hydraulic pressure supplied from an oil pump, a first solenoid valve, a secondary pressure regulating valve, a solenoid supply valve Pressure adjusting means formed;
변속비 컨트롤 밸브와, 이의 밸브을 제어하는 제2 솔레노이드 밸브로 이루어지는 변속제어수단과;Shift control means comprising a speed ratio control valve and a second solenoid valve controlling the valve thereof;
압력제어밸브와, 이의 밸브를 제어하는 제3 솔레노이드 밸브와, 매뉴얼 밸브와, 그리고 전,후진의 작동요소인 제1,2 마찰요소로 이루어지는 전,후진 제어수단과;Forward and backward control means comprising a pressure control valve, a third solenoid valve for controlling the valve, a manual valve, and first and second friction elements which are forward and backward operating elements;
상기 압력조절수단으로부터 유압을 공급받는 토오크 컨버터 피이드 밸브와, 록-업 클러치 컨트롤 밸브와, 이의 밸브를 제어하는 제4 솔레노이드 밸브로 이루어지는 토오크 컨버터 동작제어수단을 포함하여 이루어지되;A torque converter operation control means comprising a torque converter feed valve supplied with hydraulic pressure from the pressure regulating means, a lock-up clutch control valve, and a fourth solenoid valve controlling the valve thereof;
후진압 관로의 바이패스 관로 합류 부위에 전진압의 작용시 후진압의 공급을 방지할 수 있는 안전밸브를 배치하고 있다.A safety valve is installed at the conduit of the reverse pressure pipeline to prevent the supply of reverse pressure when the forward pressure is applied.
이에따라 제1 마찰부재가 작동하는 도중에는 운전자의 실수로 인하여 후진 레인지로 변환이 이루어지더라도 제2 마찰부재로 유압이 공급될 수 없도록 하는 안전회로를 구성하고 있다.Accordingly, during the operation of the first friction member, a safety circuit is configured to prevent the hydraulic pressure from being supplied to the second friction member even when the first friction member is converted to the reverse range due to a driver's mistake.
그러나 상기와 같은 유압 제어시스템에 있어서는 전진 주행중 운전자의 실수로 후진으로 변환이 이루어졌을 때 후진시 작동되는 마찰부재를 보호하고, 그 충격을 방지할 수 있다는 장점은 있으나, 전,후진압을 제어하는 솔레노이드 밸브가 고장으로 인하여 오프 상태로 작동을 정지한 상태에서는 제 기능을 다하지 못한다는 문제점을 내포하고 있다.However, the hydraulic control system as described above has the advantage of protecting the friction member that is operated when reversing when the driver's mistake is converted to the reverse while driving forward, and preventing the impact, but controls the forward and reverse pressure There is a problem in that the solenoid valve fails to function when the operation is stopped in the off state due to a failure.
따라서 본 발명은 상기와 같은 문제점을 해결하기 위하여 발명된 것으로서, 본 발명의 목적은 전진 주행중 운전자의 실수로 후진으로 변환이 이루어졌을 때 보다 안정된 안전회로를 구성할 수 있도록 한 무단 변속기의 유압 제어시스템을 제공함에 있다.Therefore, the present invention has been invented to solve the above problems, an object of the present invention is to control the hydraulic control system of a continuously variable transmission to configure a more stable safety circuit when the conversion to the reverse by the driver's mistake while driving forward. In providing.
도 1은 본 발명에 의한 유압 제어시스템에 있어서 중립(N) 레인지에서의 유압흐름도.1 is a hydraulic flow diagram in the neutral (N) range in the hydraulic control system according to the present invention.
도 2는 전진(D) 레인지에서의 유압 흐름도.2 is a flow chart of hydraulic pressure in the advance (D) range.
도 3는 후진(R) 레인지에서의 유압 흐름도.3 is a flow chart of hydraulic pressure in the reverse (R) range.
도 4는 고속의 상태에서 D → R로 매뉴얼 변속이 이루어질 때의 유압 회로도이다.4 is a hydraulic circuit diagram when a manual shift is made from D to R in a high speed state.
이를 실현하기 위하여 본 발명은, 오일펌프로부터 공급되는 유압을 조절하는 프라이머리 라인압 조절밸브와, 제1 솔레노이드 밸브와, 세컨들리 라인압 조절밸브와, 솔레노이드 서플라이 밸브로 이루어지는 압력조절수단과;In order to realize this, the present invention provides a pressure regulating means comprising a primary line pressure regulating valve for regulating hydraulic pressure supplied from an oil pump, a first solenoid valve, a secondary line pressure regulating valve, and a solenoid supply valve;
변속비 컨트롤 밸브와, 이의 밸브를 제어하는 제2 솔레노이드 밸브로 이루어지는 변속제어수단과;Shift control means comprising a speed ratio control valve and a second solenoid valve controlling the valve thereof;
압력제어밸브와, 이의 밸브를 제어하는 제3 솔레노이드 밸브와, 매뉴얼 밸브와, 그리고 전,후진의 작동부재로 이루어지는 전,후진 제어수단과;Forward and backward control means including a pressure control valve, a third solenoid valve for controlling the valve, a manual valve, and an operation member for forward and backward;
상기 압력조절수단으로부터 유압을 공급받는 토오크 컨버터 피이드 밸브와, 댐퍼 클러치 컨트롤 밸브와, 이의 밸브를 제어하는 제4 솔레노이드 밸브로 이루어지는 댐퍼 클러치 제어수단을 포함하여 이루어지되,It includes a torque converter feed valve receiving the hydraulic pressure from the pressure adjusting means, a damper clutch control valve, and a damper clutch control means consisting of a fourth solenoid valve for controlling the valve thereof,
상기 제3, 4 솔레노이드 밸브는 압력 조절수단으로부터 공급되는 유압을 감압시켜 공급하는 리듀싱 밸브압으로 압력제어밸브와 댐퍼 클러치 밸브를 제어토록 하고,The third and fourth solenoid valves control the pressure control valve and the damper clutch valve with a reducing valve pressure for reducing and supplying the hydraulic pressure supplied from the pressure regulating means,
매뉴얼 밸브로부터 후진압 마찰부재로 체결압을 공급하는 후진압 관로상에 안전밸브를 배치한 자동차용 무단 변속기의 유압 제어시스템을 제공한다.Provided is a hydraulic control system for a continuously variable transmission for a vehicle in which a safety valve is disposed on a reverse pressure pipeline for supplying a fastening pressure from a manual valve to a reverse pressure friction member.
이하, 상기의 목적을 구체적으로 실현할 수 있는 본 발명의 바람직한 실시예를 첨부한 도면에 의거하여 상세히 설명하면 다음과 같다.Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described in detail.
도 1은 본 발명에 의한 유압 제어시스템의 구성도로서, 벨트식 무단변속기를 운용하기 위한 유압제어시스템은 상기한 바와 같이, 압력조절수단에서는 오일펌프(2)로부터 압송되는 유압은 프라이머리 라인압 조절밸브(4)를 통해 라인압이 1차적으로 조절되어 세컨들리 라인압 조절밸브(6)와 무단 변속기구의 세컨들리 풀리(8)로 공급된다.1 is a configuration diagram of a hydraulic control system according to the present invention, the hydraulic control system for operating the belt-type continuously variable transmission as described above, in the pressure regulating means, the hydraulic pressure that is pumped from the oil pump (2) is the primary line pressure The line pressure is primarily regulated through the control valve 4 and supplied to the second line pressure control valve 6 and the second pulley 8 of the continuously variable transmission.
그리고 상기 세컨들리 라인압 조절밸브(6)에서는 1차로 조절된 유압을 다시 2차로 조절하여 솔레노이드 서플라이 밸브(10)와 감압수단인 리듀싱 밸브(12), 그리고 댐퍼 클러치 제어수단의 댐퍼 클러치 컨트롤 밸브(14)로 공급됨과 동시에 전,후진 제어수단의 압력제어밸브(16)로 공급된다.In the secondary line pressure regulating valve 6, the firstly regulated hydraulic pressure is secondly adjusted again to provide a solenoid supply valve 10, a reducing valve 12, which is a pressure reducing means, and a damper clutch control valve of a damper clutch control means. At the same time, it is supplied to the pressure control valve 16 of the forward and backward control means.
상기 솔레노이드 서플라이 밸브(10)에 공급된 유압은 감압이 이루어진 상태에서 제1, 2 솔레노이드 밸브(S1)(S2)로 공급되는데, 제1 솔레노이드 밸브(S1)의 제어에 따라 프라이머리 라인압 조절밸브(4)를 제어하고, 제2 솔레노이드 밸브(S2)의 제어에 따라 변속비 컨트롤 밸브(18)를 제어하여, 상기 변속비 컨트롤 밸브(18)는 프라이머리 라인압 조절 밸브(4)로부터 프라이머리 풀리(20)로 공급되는 유압을 제어하게 된다.The hydraulic pressure supplied to the solenoid supply valve 10 is supplied to the first and second solenoid valves S1 and S2 under a reduced pressure, and the primary line pressure control valve is controlled by the first solenoid valve S1. (4), and control the speed ratio control valve 18 in accordance with the control of the second solenoid valve (S2), the speed ratio control valve 18 from the primary line pressure regulating valve (4) to the primary pulley ( 20) to control the hydraulic pressure supplied.
그리고 리듀싱 밸브(12)에 의해 감압된 유압은 전,후진 제어수단의 제3 솔레노이드 밸브(S3)와, 댐퍼 클러치 제어수단의 제4 솔레노이드 밸브(S4)로 공급되는데, 제3 솔레노이드 밸브(S3)로 공급된 유압은 제3 솔레노이드 밸브(S3)의 제어에 따라 압력 제어밸브(16)를 제어하여 매뉴얼 밸브(22)로 공급되는 전,후진압을 제어하고, 제4 솔레노이드 밸브(S4)로 공급되는 유압은 이 제4 솔레노이드 밸브(S4)의 제어에 따라 댐퍼 클러치 컨트롤 밸브(14)와 안전수단인 안전밸브(24)를 제어하게 된다.The hydraulic pressure reduced by the reducing valve 12 is supplied to the third solenoid valve S3 of the forward and backward control means and the fourth solenoid valve S4 of the damper clutch control means, and the third solenoid valve S3. The hydraulic pressure supplied to) controls the pressure control valve 16 according to the control of the third solenoid valve S3 to control the forward and backward pressure supplied to the manual valve 22, and to the fourth solenoid valve S4. The supplied hydraulic pressure controls the damper clutch control valve 14 and the safety valve 24 as safety means under the control of the fourth solenoid valve S4.
상기에서 제1,2 솔레노이드 밸브(S1)(S2)는 3웨이 밸브이고, 제3,4 솔레노이드 밸브(S3)(S4)는 온/오프 밸브이다.In the above description, the first and second solenoid valves S1 and S2 are three-way valves, and the third and fourth solenoid valves S3 and S4 are on / off valves.
그리고 댐퍼 클러치 컨트롤 밸브(14)는 상기 제4 솔레노이드 밸브(S4)의 제어에 따라 세컨들리 라인압 조절밸브(6)와 토오크 컨버터 피이드 밸브(15)로부터 공급되는 유압을 댐퍼 클러치의 작동압으로 공급하여 댐퍼 클러치의 작동 및 비작동을 제어하게 된다.The damper clutch control valve 14 supplies hydraulic pressure supplied from the secondary line pressure regulating valve 6 and the torque converter feed valve 15 to the operating pressure of the damper clutch under the control of the fourth solenoid valve S4. By controlling the operation and non-operation of the damper clutch.
또한, 압력 제어밸브(16)로 공급된 유압은 제3 솔레노이드 밸브(S3)의 제어에 따라 제어가 이루어지면서 전, 후진 제어수단의 매뉴얼 밸브(22)로 공급되는데, 이의 매뉴얼 밸브(22)에는 전,후진압 관로(26)(28)가 연결되어 상기 전진압관로(26)의 유압은 어큐믈레이터(30)를 개재시킨 상태에서 전진용 마찰부재(C)의 체결압으로 공급됨과 동시에 안전밸브(24)의 제어압으로 공급된다.In addition, the hydraulic pressure supplied to the pressure control valve 16 is supplied to the manual valve 22 of the forward and reverse control means while being controlled according to the control of the third solenoid valve S3, and to the manual valve 22 thereof. The forward and backward pressure pipelines 26 and 28 are connected so that the hydraulic pressure of the forward pressure pipeline 26 is supplied at the clamping pressure of the forward friction member C while the accumulator 30 is interposed. It is supplied at the control pressure of the valve 24.
그리고, 상기 후진압 관로(28)의 유압은 안전밸브(24)를 통해 후진용 마찰부재(B)의 체결압으로 공급되는데, 상기 전,후진압 관로(26)(28)상에는 각각 병열로 오리피스(32)(34)와 첵밸브(36)(38)가 배치되어 마찰부재(C)(B)로 체결압의 공급시 오리피스(32)(34)에 의해 제어되고, 해제시 첵밸브(36)(38)에 의해 신속하게 배출된다.In addition, the hydraulic pressure of the reverse pressure pipeline 28 is supplied to the fastening pressure of the friction member B for reversing through the safety valve 24, and the orifice in parallel on the front and reverse pressure pipelines 26 and 28, respectively. (32) 34 and check valves 36 and 38 are arranged and controlled by orifices 32 and 34 at the time of supply of the clamping pressure to the friction members C and B, and upon release the check valve 36 (38) is quickly discharged.
이에따라 중립 레인지에서는 도 1에서와 같이, 전,후진 압이 매뉴얼 밸브(22)에서 차단 되는 바, 어느 마찰부재(C)(B)로도 유압이 공급되지 않는다.Accordingly, in the neutral range, as shown in FIG. 1, the forward and backward pressures are cut off by the manual valve 22, so that no hydraulic pressure is supplied to any friction member (C) (B).
그리고 전진 레인지에서는 도 2에서와 같이, 전진압 관로(24)를 통해 전진용 마찰요소(C)로 유압이 공급되면서 전진압의 일부가 도면에서 안전밸브(24)의 좌측단으로 공급되어 밸브스풀(40)을 우측으로 이동시킨 상태를 유지하게 된다.And in the forward range, as shown in Figure 2, while the hydraulic pressure is supplied to the friction element (C) for the forward through the forward pressure pipeline 24, a portion of the forward pressure is supplied to the left end of the safety valve 24 in the drawing valve spool It keeps the state which moved 40 to the right.
상기와 반대로 운전자가 후진을 위하여 후진 레인지로 변환하면, 도 3에서와 같이, 매뉴얼 밸브(22)에서 압력제어밸브(16)로부터 공급되는 유압을 후진압 관로(26)를 통해 공급하게 되는데, 이때에는 제4 솔레노이드 밸브(S4)의 오프 제어에 의해 리듀싱 밸브(12)의 제어압이 안전밸브(24)의 우측에 작용함으로써, 밸브스풀(40)이 좌측으로 이동하면서 유로를 개방하여 후진용 마찰부재(B)로 체결압이 공급되어 후진 변속이 이루어지게 되는 것이다.In contrast to the above, when the driver converts to the reverse range for reversing, as shown in FIG. 3, the hydraulic pressure supplied from the pressure control valve 16 in the manual valve 22 is supplied through the reverse pressure pipeline 26. The control pressure of the reducing valve 12 acts on the right side of the safety valve 24 by the off control of the fourth solenoid valve S4 so that the valve spool 40 moves to the left to open the flow path for the reverse direction. The fastening pressure is supplied to the friction member (B) to make the reverse shift.
그리고 차량이 일정속도(대략 8 KM/H) 이상으로 전진 주행하고 있는 상태에서 운전자의 실수로 후진으로 변속이 이루어지게 되면, 트랜스 밋션 제어유닛에서는 제4 솔레노이드 밸브(S4)를 온 제어하게 된다.When the vehicle shifts to the reverse by mistake while the vehicle is traveling forward at a constant speed (about 8 KM / H) or more, the transmission control unit turns on the fourth solenoid valve S4.
그러면, 전진 주행시 안전밸브(24)로 공급되고 있던 감압이 배출됨으로써, 안전 밸브(24)의 밸브스풀(40)은 내장된 스프링(42)에 의해 도면에서 우측으로 이동하게 되는 바, 매뉴얼 밸브(22)로부터 후진용 마찰부재(B)로 공급되는 유압을 차단하게 된다.Then, the depressurized pressure supplied to the safety valve 24 at the time of forward travel is discharged so that the valve spool 40 of the safety valve 24 is moved to the right in the drawing by the built-in spring 42. 22 to shut off the hydraulic pressure supplied to the reverse friction member (B).
상기와 같은 동작이 이루어지게 되면, 전진용 마찰부재(C)의 체결압은 해제되고, 후진용 마찰부재(B)에는 체결압이 공급되지 않는 바, 중립의 상태가 된다.When the operation as described above is made, the fastening pressure of the forward friction member (C) is released, the fastening pressure is not supplied to the reverse friction member (B), the neutral state.
이와같이 자동차가 주행중에 중립상태가 되면 엔진 회전수는 갑자기 증가함과 동시에 엔진 소음이 커지게 되는 바, 운전자는 현재 차량의 변속이 오조작되었음을 인식하여 셀렉트 레버를 다시 전진(D) 상태로 이동시키거나 브레이크를 작동시키는 방안으로 비상 조치를 취할 수 있게 되는 것이다.In this way, when the vehicle is in a neutral state while driving, the engine speed suddenly increases and the engine noise increases, and the driver recognizes that the shift of the vehicle is incorrectly operated and moves the select lever back to the forward (D) state. Or actuate the brakes so that emergency measures can be taken.
이상에서와 같이 본 발명에 의하면, 전진 주행중 운전자의 실수로 후진으로 변환이 이루어졌을 때 차량을 중립의 상태로 유도함으로써, 운전자가 이를 빨리 인식하여 비상조치를 취할 수 있게 되는 바, 후진시 작동되는 마찰부재로의 급작스런 유압 공급을 방지하여 이의 마찰부재를 보호하고, 이에따른 변속충격을 방지할 수 있는 발명인 것이다.As described above, according to the present invention, when the driver's mistake is converted to reverse during the forward driving, the vehicle is guided to the neutral state, so that the driver can quickly recognize the emergency and take emergency measures. The invention is to prevent the sudden hydraulic supply to the friction member to protect its friction member, thereby preventing the shift shock.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019990005882A KR100302726B1 (en) | 1999-02-23 | 1999-02-23 | Hydraulic control system of continuously variable transmission for vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019990005882A KR100302726B1 (en) | 1999-02-23 | 1999-02-23 | Hydraulic control system of continuously variable transmission for vehicle |
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| KR20000056508A KR20000056508A (en) | 2000-09-15 |
| KR100302726B1 true KR100302726B1 (en) | 2001-09-22 |
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| KR100463056B1 (en) * | 2002-10-08 | 2004-12-23 | 현대자동차주식회사 | Variable tail pipe apparatus |
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