Hydraulic control system for an automatic transmission for a motor vehicle专利检索-自动油门飞机类型专利检索查询-专利查询网

Hydraulic control system for an automatic transmission for a motor vehicle

阅读：283发布：2022-08-10

专利汇可以提供Hydraulic control system for an automatic transmission for a motor vehicle专利检索，专利查询，专利分析的服务。并且A hydraulic control system for an automatic transmission, having a torque converter or a hydraulic coupler and a servo-operated speed change gear, for use in vehicles, includes a pressure regulator regulating a control hydraulic pressure supplied to the servo-operated speed change gear, and further includes a pressure modulator valve connected to the pressure regulator to assure smooth torque transmission for a large torque demand during low speed operation of the vehicle. A compensating pressure provided by the pressure modulator valve is applied to the pressure regulator valve to assure a control pressure, proportional to the throttle pressure opening or the torque demand, being applied to the servo-operated speed change gear. The pressure modulator valve restricts the control pressure to a value below the maximum constant pressure for a throttle valve opening exceeding a certain value, preventing excessive increase in the control pressure and assuring a constant low control pressure when the vehicle speed increases to a predetermined speed or when the transmission is set for the usual driving range.，下面是Hydraulic control system for an automatic transmission for a motor vehicle专利的具体信息内容。

权利要求

1. In an automatic transmission for a motor vehicle having an engine drive shaft, a manually operable throttle and a manually operable speed selector, the transmission including a hydraulic servo-operated speed change gear, fluid torque transmitting means coupling the engine drive shaft to the speed change gear, a hydraulic pressure regulating valve regulating a control hydraulic pressure supplied to the servo-operated speed change gear, and a speed responsive governor: a hydraulic pressure control system comprising, in combination, a pressure modulator valve including a movable valve body and a movable plug movable independently of said valve body, said plug being operable to apply an operating force to said movable valve body; means connecting said pressure modulator valve to said pressure regulating valve to apply a compensating hydraulic pressure to said pressure regulating valve in accordance with displacement of said valve body; a throttle valve operable by said throttle and connected to said pressure modulator valve to apply, to said movable valve body, a hydraulic pressure proportional to opening of said throttle to vary said compensating pressure in accordance with the opening of said throttle to correspondingly vary said control hydraulic pressure; and means, including said governor, applying directly to one side of said movable plug only a hydraulic pressure proportional directly to the vehicle speed and, to the other side thereof, said only control hydraulic pressure; whereby said movable plug exerts no operating force on said valve body until the hydraulic pressure proportional to the vehicle speed exceeds a predetermined value; said movable plug, when the hydraulic pressure proportional to the vehicle speed exceeds said predetermined value, exerting an operating force on said valve body in opposition to said hydraulic pressure proportional to said throttle opening, to move said valve body in a direction to apply, to said pressure regulating valve, a compensating pressure independent of the throttle opening to maintain said control hydraulic pressure constant.

2. In an automatic transmission for a motor vehicle, a hydraulic pressure control system, as claimed in claim 1, in which, when the throttle opening exceeds the predetermined value while the hydraulic pressure proportional to the vehicle speed is below a predetermined value, said modulator valve applies, to said pressure regulating valve, a compensating pressure independent of the throttle opening and effective to maintain said control hydraulic pressure at a constant maximum value.

3. In an automatic transmission for a motor vehicle, a hydraulic pressure control system, as claimed in claim 1, in which said pressure modulator valve includes a bore in which said movable valve body and said movable plug are movable; a spring interposed between said movable plug and one end of said movable valve body; and means applying, to the opposite end of said movable valve body, a hydraulic pressure propoRtional to opening of said throttle.

4. In an automatic transmission for a motor vehicle, a hydraulic pressure control system, as claimed in claim 3, in which said bore includes a chamber connected to said pressure regulating valve and having said control hydraulic pressure supplied thereto through a port; said movable valve body, responsive to a hydraulic pressure proportional to opening of said throttle and above a predetermined value, blocking said port and connecting said chamber to a discharge port to reduce said compensating pressure to zero.

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Hydraulic control system for an automatic transmission for a motor vehicle

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