Transmission Shift Element Control for Tooth-On-Tooth Resolution
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Solution Overview
Problem
Existing methods for operating interlocking shifting elements in vehicle transmissions struggle to reliably resolve tooth-on-tooth positions, which can prevent proper gear shifting and potentially damage the transmission.
Innovation Solution
A method that determines a target torque required to resolve a tooth-on-tooth position in an interlocking shifting element based on the electric current strength through the element's actuator, allowing the electric machine to deliver this torque without the need for frictional shifting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tooth-on-tooth position is recognized in an interlocking shifting element, then an actuator is activated to resolve the position, but the torque applied might be too large and damage the transmission
Solution Approach 1:
The patent changes the parameter of torque application by using electric current strength as a controlled variable. Instead of applying fixed or mechanical torque, the system varies the electric current to the actuator based on the detected tooth-on-tooth condition, enabling precise control of the resolving torque to avoid transmission damage while reliably resolving the interlocking position.
Solution Approach 2:
The patent implements feedback control by monitoring the electric current strength through the actuator during the resolution process. The control unit continuously adjusts the current based on the detected tooth-on-tooth position and the actuator's response, ensuring that sufficient torque is applied to resolve the interlocking while preventing excessive torque that could damage the transmission.
2Ease of operation
If frictional shifting elements are used to resolve tooth-on-tooth positions, then the shifting element can be actuated, but the system becomes more complex and less precise
Solution Approach 1:
The patent replaces frictional shifting elements with an electric actuator system. Instead of using mechanical friction-based mechanisms to actuate the interlocking shifting element, the invention uses an electric actuator controlled by current strength, simplifying the mechanism while increasing precision and control capability.
Data Source
AI summary
Disclosed is a method for operating an interlocking shifting element of a transmission of a vehicle, the interlocking shifting element having shifting element halves which can be moved relative to one another when opening and closing the interlocking shifting element. An electric actuator is arranged to about the relative movement between the shifting element halves when the interlocking shifting element is opened and/or closed. After recognizing a tooth-on-tooth position in the interlocking shifting element, a target torque to be applied at the transmission input is determined as a function of an electric current strength through the electric actuator of the interlocking shifting element, where the target torque is sufficient to resolve the tooth-on-tooth position in the interlocking shifting element.