Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for controlling the transfer of torque of a force-fitting shift element

A technology of switching elements and torque transmission, which is applied to elements with teeth, the arrangement of multiple different prime movers of general power plants, and the control of transmissions, etc., which can solve problems such as high system pressure and system pressure reduction, To achieve the effect of reducing deposition

Active Publication Date: 2016-12-21
ZF FRIEDRICHSHAFEN AG
View PDF8 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, other users of the hydraulic circuit require high system pressure in some cases, so that the reduction of system pressure is not possible

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for controlling the transfer of torque of a force-fitting shift element
  • Method for controlling the transfer of torque of a force-fitting shift element
  • Method for controlling the transfer of torque of a force-fitting shift element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] figure 1A powertrain of a motor vehicle is schematically shown. The internal combustion engine VKM can be connected to the electric machine EM via the switching element K0. The electric machine EM and the shifting element K0 are part of the transmission G of the motor vehicle. Configure the piston K for the switching element. The shifting element can be closed by pressing the piston K so that the shifting element can transmit torque. The motor vehicle transmission G has a shifting unit GW, which is provided for switching between the input shaft and the output shaft of the motor vehicle transmission G to shift different transmission ratios. The output shaft of the motor vehicle transmission G is drivingly connected to the shaft reducer AG, and the power of the output shaft is distributed to the wheels DW of the motor vehicle via the shaft reducer. The shift unit GW of the motor vehicle transmission G requires hydraulic pressure in order to provide its function. For ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Method for controlling the transfer of torque of a force-fitting shift element (K0), which can be closed by a closing pressure acting on a piston (K), whereas, in order to control the closing pressure, a control valve (V) is configured, depending on a control signal of a control unit (ECU), through the setting of the valve lift (V_s), to transmit the system pressure (p_sys) of a hydraulic circuit (K1) to the piston (K), or to reduce it as needed, whereas, upon the presence of a closing request at the shift element (K0) and a prevailing system pressure (p_sys) of the hydraulic circuit (K1) above a threshold value for the system pressure (p_sys-t), the closing pressure is controlled at least temporarily in a manner different than when it is controlled upon the presence of a closing request at the shift element (K0) and a prevailing system pressure (p_sys) below the threshold value for the system pressure (p_sys-t).

Description

technical field [0001] The invention relates to a method for controlling the torque transmission of a non-positive shifting element which can be closed by a closing pressure acting on a piston. A control valve is provided for this purpose, which, depending on the control signal from the control unit, transmits the system pressure of the hydraulic circuit to the piston or reduces it as required in order to set the closing pressure in this way. The invention also relates to a control unit for operating a drive train with such a switching element. Background technique [0002] Non-positive shifting elements are frequently used in drive trains of motor vehicles, for example in automatic transmissions. Non-positive shifting elements, such as multi-disk clutches or disk brakes, are characterized by a variable torque transmission capacity. Overlapping simultaneous opening of the first non-positive shifting element and closing of the second non-positive shifting element enables, f...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/02F16H61/12F16H61/30
CPCF16H61/0262F16H61/12F16H61/30F16H2710/00F16H2306/00F16H61/061F16H61/0031B60Y2300/42B60K6/48B60W10/02B60K2006/4825B60W2510/0275B60W2510/1075B60W2710/02B60W2710/021F16D48/06F16D2500/3024F16D2500/3027F16D2500/3166B60K6/387F16D2500/1045F16H61/0265F16H63/46Y10S903/914Y10S903/946Y10S903/951Y02T10/62B60K6/40B60K6/46B60Y2200/92B60Y2300/426F16D48/066F16D2500/1107F16D2500/50287F16H61/0021F16H61/0276
Inventor C·科勒F·德普雷茨
Owner ZF FRIEDRICHSHAFEN AG