Hydraulic control device for belt type stepless variable transmission
A technology of continuously variable transmissions and control devices, which is applied to transmission devices, geared components, transmission control, etc., can solve the problems of forward clutch connection lag, low hydraulic pump discharge, impact, etc., to prevent impact and improve The effect of oil volume input and reduction of oil volume
Inactive Publication Date: 2008-04-30
JATCO LTD
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Problems solved by technology
However, since the engine speed at idling is kept low, the discharge volume of the hydraulic pump is low, and it becomes difficult to ensure the volume of oil supplied to the forward clutch in terms of the oil volume input and output.
As a result, the engagement of the forward clutch is delayed, or, thereafter, it is engaged rapidly to cause a shock.
Method used
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[0028] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings and the like.
[0029] FIG. 1 is a schematic configuration diagram showing a hydraulic control device of a belt-type continuously variable transmission according to the present embodiment. The belt-type continuously variable transmission 10 has a primary pulley 11 , a secondary pulley 12 , a V-belt 13 , a CVT control unit 20 (hereinafter referred to as CVTCU), and a hydraulic control unit 30 .
[0030] The primary pulley 11 is a pulley on the input shaft side for inputting the rotation of the engine 1 to the belt type continuously variable transmission 10 . The main pulley 11 has a fixed conical plate 11b that rotates integrally with the input shaft 11d, and a movable conical plate 11a that is arranged opposite to the fixed conical plate 11b to form a V-shaped pulley. The groove, moreover, is displaceable in the axial direction according to the hydraulic pressur...
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A hydraulic pressure control device is provided to control hydraulic fluid pressure supplied to pulleys of a continuously variable transmission to change a gear ratio. A line pressure regulating component (40) is controlled by a hydraulic CVT controller to regulate line pressure from a hydraulic fluid pump. A secondary pressure regulating component (46,54) regulates the line pressure to supply a target pressure to the secondary pulley such that the target pressure increases as the signal pressure increases. A signal pressure regulating component (52) adjusts the signal pressure by draining the hydraulic fluid from a pilot line pressure such that the signal pressure increases as the aperture size of the solenoid valve increases. The signal pressure regulating component regulates the signal pressure so that the target pressure supplied to the secondary pulley is at a maximum from a time the forward clutch is released to a time the forward clutch is re-engaged.
Description
technical field [0001] The invention relates to a hydraulic control device of a belt type continuously variable transmission. Background technique [0002] For a vehicle equipped with a continuously variable transmission, Patent Document 1 describes the following content. When the shift position is switched from N gear to D gear, the supply pressure to the forward clutch is increased, the forward clutch is engaged, and the transmission is performed from the engine to the continuously variable transmission. torque transmission. [0003] Patent Document 1: (Japanese) Unexamined Patent Application Publication No. 2004-125055 [0004] After the shift position is shifted from N range to D range, since the vehicle may start quickly, it is necessary to rapidly increase the supply pressure to the forward clutch in order to improve responsiveness when the forward clutch is engaged. However, since the engine speed during idling remains low, the discharge rate of the hydraulic pump i...
Claims
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IPC IPC(8): F16H61/00F16H61/04F16H9/04
CPCF16H2061/0488F16H2312/02F16H61/66272F16H61/04F16H61/00
Inventor 若山英史森田儒生
Owner JATCO LTD