Transmission Shift Element Position Detection via Actuator Current
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Solution Overview
Problem
Existing methods for determining the shifting position of interlocking shifting elements in vehicle transmissions require position sensors, which are not always necessary or reliable, particularly in cases where tooth-on-tooth positions or end positions need to be identified without direct measurement.
Innovation Solution
The method involves detecting the strength of the electric current through the electric actuator connected to the interlocking shifting element, using a limit value and a defined time interval to determine whether the shifting element is in a tooth-on-tooth or end position, eliminating the need for a position sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a position sensor is used to determine the shifting position of the interlocking shifting element, then the measurement precision and reliability are improved, but the device complexity and cost increase
Solution Approach 1:
The electric actuator monitors its own operational state by detecting current strength during operation. The control apparatus uses this self-generated information to determine shifting positions without requiring external position sensors, making the system self-sufficient and eliminating additional measurement components
Solution Approach 2:
The patent replaces the mechanical/electrical measurement system (position sensor) with an electrical detection system that monitors current strength. This substitution uses the existing actuator's electrical characteristics to infer mechanical position, eliminating the need for separate measurement devices
2Reliability
If a position sensor is installed to detect shifting positions, then the reliability of position detection is improved, but the device complexity and manufacturing cost worsen
Solution Approach 1:
The system uses information already available from the actuator's operation (current strength) rather than requiring additional sensors. This self-service approach maintains reliable position detection while simplifying manufacturing by eliminating the need to source, install, and calibrate position sensors
Solution Approach 2:
The electric actuator serves dual functions: it both actuates the shifting element and provides position information through current strength detection. This multi-functionality eliminates the need for separate position sensing components, simplifying the overall system and manufacturing process
3Device complexity
If current strength detection is used to determine shifting position, then the device complexity is reduced, but the measurement precision may worsen
Solution Approach 1:
The control apparatus continuously monitors current strength during actuator operation and uses this feedback to determine shifting positions. By analyzing the relationship between current strength and actuator position, the system achieves accurate position detection without requiring direct measurement sensors
Solution Approach 2:
The system changes the measurement parameter from direct mechanical position (requiring position sensors) to electrical current strength (measurable by existing actuator circuitry). This parameter transformation enables position determination using existing components while maintaining measurement accuracy through the established current-position relationship
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for reliable and sensor-less determination of shifting positions, verifying the accuracy of sensor-determined positions and ensuring proper operation of interlocking shifting elements in vehicle transmissions.
Implementation Method 1
the strength of the electric current through the electric actuator is detected and, depending on the strength of the current in the electric actuator, a conclusion is drawn about the shifting position of the interlocking shifting element
Data Source
AI summary
Disclosed is a method for operating an interlocking shifting element of a transmission of a vehicle, where the interlocking shifting element has 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 bring about the relative movement between the shifting element halves when opening and/or closing the interlocking shifting element. An electric current strength through the electric actuator is determined and, depending on the electric current strength through the electric actuator, a conclusion is reached about the shifting position of the interlocking shifting element.