Determination method for actuation touch point pressure value of a friction shift element

一种接合元件、压力值的技术，应用在带有齿的元件、离合器、机器齿轮/传动机构测试等方向，能够解决提高传动装置制造成本等问题，达到结构上简单、成本低廉的效果

Active Publication Date: 2012-04-25
ZF FRIEDRICHSHAFEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Furthermore, the sensors arranged in the region of the rotating components require installation space and increase the production costs of the transmission
In addition, in the event of a functional failure in the region of the sensor system, no service life-dependent adaptation of the actuation pressure value can be carried out, which also increases the maintenance effort of the transmission to an undesired degree.

Method used

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  • Determination method for actuation touch point pressure value of a friction shift element
  • Determination method for actuation touch point pressure value of a friction shift element
  • Determination method for actuation touch point pressure value of a friction shift element

Examples

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Embodiment Construction

[0023] figure 1 A strongly schematic illustration of a drive train 1 of an all-wheel drive vehicle is shown. The drive train 1 comprises a drive machine 2 and a main transmission 3 , both of which can themselves be transmissions known from practice and by means of which can exhibit different transmission ratios for forward and reverse travel.

[0024] The drive train 1 has two drivable axles 4, 5, which are connected in a known manner to at least one drive wheel 6A, 6B or 7A, 7B on each vehicle side, and the axle 4 of said axles is The rear axle of the vehicle and axle 5 is the front axle of the vehicle. A transmission 8 configured as a longitudinal transfer is arranged between the main transmission 3 and the axles 4 , 5 , by means of which a first vehicle longitudinal axle 15A and a second vehicle longitudinal axle 15A between the vehicle rear axle 4 and the vehicle front axle 5 Two vehicle longitudinal shafts 15B distribute the drive torque of the drive machine 2 to an inp...

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Abstract

A method of determining an applied actuation touch point pressure value of a frictionally engaged shift element of a transmission at which transmission, via the shift element, is approximately zero, and an increase in pressure relates to an increase of the power transmission via the shift element. The method includes supplying a predefined pressure to the shift element at which power transmission is zero. Increasing the target pressure by an offset pressure to transfer the shift element into a predefined operating state which initiates time monitoring. Determining a characteristic of the actual pressure. After a testing time, a monitoring period is compared with a reference period. When the monitoring period is less than or equal to the reference period, the applied pressure is set to be equivalent with the target pressure.

Description

technical field [0001] The invention relates to a method according to the type defined in the preamble of claim 1 for determining the abutment actuation pressure value of a friction-fit coupling element of a transmission. Background technique [0002] Friction-locking coupling elements are, for example, diaphragm clutches, multi-disc brakes or the like. Transmissions of the vehicle drive train, in particular multi-stage automatic transmissions or transverse transfers, or all-wheel distribution clutches, can usually be achieved by providing a minimum The transmission capacity of the friction-locking engagement element is changed by an operating force between a value and a maximum value at which the friction-locking engagement element is fully open and the transmission capacity is substantially equal to zero; at which maximum value the friction-locking engagement element The engagement elements are substantially completely closed and in a slip-free operating state. [0003] I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/02
CPCF16H2342/042F16D2500/50251F16D48/066F16D2500/3166F16D2500/1026F16H2061/0087F16D2500/3024F16H61/061
Inventor 格哈德·赫尔曼·马丁威尔弗里德·艾伯哈德贝恩德·乌梅尔
Owner ZF FRIEDRICHSHAFEN AG
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