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Method for determining reference values of sensor, and controller

A reference value, sensor technology, used in transmission control, elements with teeth, belts/chains/gears, etc., can solve the problem of not having transmission accuracy, affecting position determination, not considering service life drift sensing system and temperature related issues

Active Publication Date: 2020-06-09
ZF FRIEDRICHSHAFEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] All tolerances of sensors and sensing systems as well as production-related dispersions therefore adversely affect position determination
As a result, the position determination of the shifting element halves does not have the accuracy necessary for the operation of the transmission
[0015] Furthermore, it is disadvantageous that the so-called service life drift of the claw position determination and the temperature-related and system pressure-related tolerances of the sensor system are not taken into account when determining the end positions of the shifting element halves of the form-fitting shifting element
In this case, the service life drift is caused by wear in the region of the shifting element halves of the form-fitting shifting element

Method used

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  • Method for determining reference values of sensor, and controller
  • Method for determining reference values of sensor, and controller
  • Method for determining reference values of sensor, and controller

Examples

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Embodiment Construction

[0062] figure 1 A schematic diagram of a vehicle drive train 1 including a drive machine 2 , a transmission 3 and a driven output 4 is shown. Drive machine 2 is presently designed as an internal combustion engine. The transmission 3 is an automatic transmission in which a plurality of gear stages "1" to "9" for forward travel and at least one gear stage "R" for reverse travel are possible. Depending on the configuration of the drive train 1 of the vehicle, the output output 4 includes one, two or more drivable axles, which can be acted upon by the torque of the drive machine 2 via the transmission 3 . The hydraulically actuatable shift elements A to F are actuated during a gear ratio change in the transmission 3 , ie during an upshift or a downshift in the transmission 3 . In this case, the gear ratio change should be carried out essentially without interruption of the tractive force with a high level of driving comfort and with the desired performance. The term "performanc...

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Abstract

A method for determining reference values of a sensor corresponding to a disengaged operating condition or to an engaged operating condition of a hydraulically actuatable, form-locking shift element (A,F), wherein at least one operating parameter of the form-locking shift element (A,F) is detected with the sensor during a disengagement and during an engagement of the form-locking shift element (A,F). The method may include subdividing an operating range of the shift form-locking element (A,F) into temperature and pressure classes. The method may further include determining a deviation betweena current reference value for a temperature and pressure class of the temperature and pressure classes and an adapted reference value previously determined for the temperature and pressure class. Additionally, the method may include increasing or decreasing the adapted reference value by a predefined increment based on the deviation. The invention relates to a controller for executing the method mentioned above, and a corresponding computer program product.

Description

technical field [0001] The invention relates to a method for determining a reference value of a sensor according to the type specified in the preamble of claim 1 . Furthermore, the invention relates to a controller for carrying out the method and a corresponding computer program product. Background technique [0002] DE 10 2005 002 337 A1 discloses a transmission in the form of an eight-speed multi-stage transmission with friction-locking shifting elements. These shifting elements are designed as multi-plate clutches or multi-plate brakes. When there is a shift request in the transmission for changing the transmission ratio, at least one of the frictional shifting elements must be disconnected from the power flow of the transmission device and at least one other must be disconnected. The friction-locking shifting elements are inserted into the power flow of the transmission device in order to transmit torque. [0003] Generally, when a request is made to disengage the fri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/02F16H61/688F16H61/686
CPCF16H61/0202F16H61/688F16H61/686F16H2342/042F16H59/68F16H2059/6807F16H2061/0087F16H61/00F16H2063/3093
Inventor C·潘内克M·耶勒
Owner ZF FRIEDRICHSHAFEN AG
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