Hydraulic control system for automatic transmission
A technology of hydraulic control system and pressure control, applied in transmission control, components with teeth, belts/chains/gears, etc., can solve problems such as difficult control and increased manufacturing costs
Inactive Publication Date: 2008-06-18
HYUNDAI MOTOR CO LTD
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Problems solved by technology
[0020] Also, since the line pressure is operated by the forward pressure range, the reverse pressure range, and the supplementary operation of the elastic member elastically supporting the spool, it is difficult to control variably according to the operating conditions
[0021] In addition, when driving at high speed, due to the high line pressure, a shift valve for reducing hydraulic pressure is required, which increases the manufacturing cost
Method used
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[0034] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0035] figure 1 It is a schematic diagram of the hydraulic control system at N and P positions according to an embodiment of the present invention.
[0036] Such as figure 1 As shown in , the hydraulic pressure generated in the oil pump 2 is controlled at a predetermined level in the line pressure control assembly A, and then supplied to the manual valve 4 and the hydraulic control assembly B.
[0037] The manual valve 4 realizes pipeline conversion according to the position of the selection lever, and the hydraulic pressure controlled in the hydraulic control assembly B is provided to the friction element directly or through the pipeline conversion assembly C.
[0038] The line pressure control assembly A includes a pressure regulating valve 24 for controlling the hydraulic pressure at a predetermined level, and a solenoid valve S6 for con...
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The present invention provides a hydraulic control system for an automatic transmission of a vehicle in which an oil pump of the hydraulic control system generates hydraulic pressure and a manual valve of the hydraulic control system realizes a line conversion according to a selected shift range. The control system comprises a line pressure control assembly including a regulator valve and a solenoid valve for controlling the regulator valve; a hydraulic pressure control assembly including: a reducing valve; first, second, third, and fourth solenoid valves; and first, second, third, and fourth pressure control valves which are independently controlled by the first, second, third, and fourth solenoid valves, respectively; and a line conversion assembly including: a first fail-safe valve interposed between the first pressure control valve of the hydraulic pressure control assembly and a low-reverse brake operating in first and reverse speeds; and a second fail-safe valve interposed between the second pressure control valve of the hydraulic pressure control assembly and a second brake operating in first and second speeds.
Description
[0001] Related Applications Cited [0002] This application claims priority and benefit from Korean Patent Application No. 10-2006-0126566 filed in the Korean Intellectual Property Office on December 12, 2006, the entire contents of which are hereby incorporated by reference. technical field [0003] The invention relates to a hydraulic control system of a vehicle automatic transmission. More specifically, the present invention relates to a hydraulic control system of an automatic transmission for a vehicle, wherein the control pressure supplied to the pressure reducing valve is used as a pressure source for a plurality of solenoid valves including a hydraulic control assembly, and as another for controlling line pressure The pressure source of the solenoid valve. Background technique [0004] A vehicle automatic transmission automatically shifts gears to a target gear based on various conditions such as vehicle speed and throttle opening. [0005] If the driver shifts the...
Claims
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IPC IPC(8): F16H61/00F16H59/02F16H61/12F16H61/68F16H61/684
CPCF16H61/0206F16H61/12F16H61/00
Inventor 朴达秀
Owner HYUNDAI MOTOR CO LTD