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Transmission hydraulic control system

A technology of hydraulic control system and transmission, which is applied in the direction of road vehicle drive control system, transmission control, gear transmission mechanism, etc., and can solve problems such as hysteresis and pressure drop

Inactive Publication Date: 2021-06-22
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during an autostop, the engine is no longer driving the transmission pump, so the hydraulic fluid pressure in the hydraulic control system drops, which causes the clutches and / or brakes in the transmission to disengage
When the engine is restarted, these clutches and / or brakes require time to fully re-engage, creating a lag between engaging the gas pedal or releasing the brakes and the movement of the motor vehicle

Method used

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  • Transmission hydraulic control system
  • Transmission hydraulic control system
  • Transmission hydraulic control system

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Embodiment Construction

[0033] The following description is merely exemplary in nature and is not intended to limit the disclosure, application or uses.

[0034] refer to figure 1 A transmission hydraulic control system 10 for actuating at least one torque-transmitting device 12 in an automotive transmission 14 includes a hydraulic circuit 16 in fluid communication with at least one torque-transmitting device 12 , in fluid communication with the hydraulic circuit 16 and adapted to provide hydraulic Circuit 16 provides a transmission pump 18 that pressurizes hydraulic fluid, and an accumulator 20 .

[0035] The at least one torque transmitting device 12 is hydraulically actuated by hydraulic fluid. The at least one torque-transmitting device 12 may include a plurality of friction clutches and / or brakes, or other types of hydraulically actuated torque-transmitting devices 12 . As a non-limiting example, the hydraulic fluid is oil conventionally used in automatic transmission systems.

[0036] The hydr...

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PUM

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Abstract

A transmission hydraulic control system for an automatic transmission includes a hydraulic circuit in fluid communication with at least one torque transmitting device, a transmission pump in fluid communication with the hydraulic circuit and adapted to provide pressurized hydraulic fluid to the hydraulic circuit, an automatic transmission includes a hydraulic circuit, an accumulator in fluid communication with the hydraulic circuit and having an annular cylindrical shape coaxial with a centerline of the automatic transmission, an annular piston movable between a first position and a second position, a spring adapted to bias the piston to the first position, and a valve mechanism located between the hydraulic circuit and the accumulator, the valve mechanism being adapted to selectively permit fluid communication between the accumulator and the hydraulic circuit.

Description

technical field [0001] The present disclosure relates to a hydraulic control system for an automatic transmission in a motor vehicle. Background technique [0002] Conventional automatic transmissions include a hydraulic control system that is used, among other functions, to actuate a number of torque-transmitting devices. These torque-transmitting devices may be, for example, friction clutches and brakes. Conventional hydraulic control systems typically include a main pump that provides pressurized fluid, such as oil, to a number of valves and solenoids within a valve body. The main pump is driven by the engine of the motor vehicle. Valves and solenoids are operable to direct pressurized hydraulic fluid through a hydraulic fluid circuit to various torque transmitting devices within the transmission. Pressurized hydraulic fluid delivered to the torque transmitting devices is used to engage or disengage the devices to achieve different gear ratios. [0003] To improve the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/00F16H61/02F16D48/02F16D48/06F16D65/14F16D121/04F16D125/00
CPCF16H61/0025F16H61/0262F16D48/02F16D48/066F16D65/14F16H2061/0034F16D2048/0203F16D2048/0287F16D2121/04F16D2125/00F16H61/0021F16H61/0206B60Y2300/18016F16H61/30F16H2708/20F16H2061/305F15B2201/31F15B1/022F15B2201/21F15B1/024
Inventor E·W·梅利特L·巴辛K·埃贝尔
Owner GM GLOBAL TECH OPERATIONS LLC