Pressure holding apparatus for a torque-transmitting mechanism
a technology of torque-transmitting mechanism and holding apparatus, which is applied in the direction of servomotors, thin material handling, servomotor components, etc., can solve the problems of affecting the operation of the vehicl
Active Publication Date: 2005-09-22
GM GLOBAL TECH OPERATIONS LLC
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Benefits of technology
[0006] It is an object of the present invention to provide an
Problems solved by technology
However, when it is desired to begin moving the vehicle after the stop, the engine must start and the vehicle must begin moving in a substantially seamless manner.
The time required to fill a servomechanism operating the torque-transmitting mechanism quite generally causes a delay between the engine starting and the vehicle beginning to move.
While these systems permit the engine operation to be discontinued, the use of a separate pump is energy consuming, space consuming, and more expensive.
The space and mass considerations of the additional pumping mechanism are probably the most serious penalties that are associated with this solution.
The space under the vehicle where the powertrain is positioned is very sparse and the addition of any expansion causing assemblies is detrimental or least desirable to the system.
Also, the addition of a separate pump mechanism creates an increase in mass for the vehicle and an increased cost.
Method used
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[0019] Referring to the drawings, wherein like characters represent the same or corresponding parts throughout the several views, there is seen in FIG. 1 a portion of a hydraulic control system or mechanism 10 including a hydraulic pump 12, a torque sensitive valve 14, a shift control valve 16, a shift valve 18, a pressure holding valve 20, a torque-transmitting mechanism 22, and an accumulator 24.
[0020] The pump 12 is driven by engine, not shown. During operation, the pump 12 drives fluid from a reservoir or sump 26 for delivery to a main pressure passage 28, which is connected with the torque sensitive valve 14, the shift control valve 16, and the remainder of a transmission control 30. The transmission control 30 is a conventional control mechanism having a plurality of valves and other hydraulic mechanisms, which are operable to control various torque-transmitting mechanisms in the powertrain. The transmission control 30 also will include a conventional electronic control modul...
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A pressure holding apparatus incorporates a hydraulic pressure system having an engine-driven pressure source, a pressure holding valve, and a torque-transmitting mechanism. The torque-transmitting mechanism is selectively engaged and disengaged by fluid pressure from the engine-driven pressure source during normal powertrain operation. The torque-transmitting mechanism apply chamber is pressurized with the oil by the pressure holding valve when the engine operation is discontinued.
Description
TECHNICAL FIELD [0001] This invention relates to pressure holding apparatus and, more particularly, to pressure holding apparatus for a torque-transmitting mechanism in a hybrid powertrain. BACKGROUND OF THE INVENTION [0002] Vehicles utilizing hybrid powertrain systems incorporate an engine stop-start function. When the vehicle is stopped in traffic, for example, at traffic lights or slow-moving traffic, the engine operation is discontinued. However, when it is desired to begin moving the vehicle after the stop, the engine must start and the vehicle must begin moving in a substantially seamless manner. There is to be no delay when the operator wishes to accelerate the vehicle along with the remainder of traffic. [0003] The ability to stop and restart the engine improves the overall economy of the vehicle especially in fuel economy. Most hybrid systems will employ at least one torque-transmitting mechanism, such as a clutch or brake, which is engaged when the vehicle is to be launche...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F15B13/043F15B13/044F16D48/02F16D48/04
CPCF16D2048/0203F16D48/04Y10T137/87169
Inventor SOWUL, HENRYKSOLT, MICHAEL B.KOZAN, MICHAEL A.
Owner GM GLOBAL TECH OPERATIONS LLC