Electronic Parking Lock Dual Sensor Angle Detection
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Solution Overview
Problem
Existing electronic parking lock apparatuses face inaccuracies in determining the shift range due to reliance on relative rotation angle detection by rotary encoders, which require learning the collision position each time the ignition is turned on, leading to potential false determinations or delays.
Innovation Solution
The apparatus incorporates a relative rotation angle sensor, an absolute rotation angle sensor, a parking position holding portion, and a rotation end limiting portion to calculate the absolute rotation angle, enhancing the precision of determining the parking lock's working status by using both sensors' data and providing a reference rotation position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a relative rotation angle sensor (rotary encoder) is used to detect the rotation angle of the electric motor, then the device complexity is reduced, but the measurement precision and reliability of the parking lock status determination deteriorates due to learning failures and false determinations
Solution Approach 1:
The patent divides the rotation detection function into two independent sensor systems: a relative rotation angle sensor for detecting motor rotation and an absolute rotation angle sensor for detecting the actual parking pole position. This segmentation allows each sensor to perform its specific function without interference, eliminating the learning failure issues while maintaining reasonable device complexity.
Solution Approach 2:
The patent introduces a rotation end limiting portion as an intermediary mechanical structure that physically limits the rotation of the rotating component. This intermediary provides a reliable reference point for the absolute rotation angle sensor, ensuring accurate status determination without requiring complex learning procedures.
2Ease of operation
If a relative rotation angle sensor is used without absolute position reference, then the ease of operation is improved, but the reliability of the parking lock status determination deteriorates due to learning delays and false determinations
Solution Approach 1:
The patent implements preliminary action by pre-establishing the reference rotation position through the rotation end limiting portion and detected component arrangement. The absolute rotation angle sensor is pre-configured to detect the correct parking status position, eliminating the need for learning procedures each time the ignition is turned on, thus ensuring reliable operation from the first use.
3Measurement precision
If the rotation end limiting portion is positioned to exceed the parking position holding portion, then the measurement precision is improved by providing reference rotation position information, but the device complexity increases due to additional structural components
Solution Approach 1:
The patent merges the rotation end limiting portion with the existing rotating component structure. The limiting portion is integrated into the rotating component rather than being a separate assembly, and the detected component is arranged to work with the absolute rotation angle sensor. This merging approach provides the necessary reference position information while minimizing additional structural complexity.
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 configuration improves the precision and reliability of determining the parking lock's status by using dual systems of relative and absolute rotation angle sensors, reducing the impact of learning failures and foreign matter interference.
Implementation Method 1
a relative rotation angle sensor, detecting a relative rotation angle of the electric motor
Implementation Method 2
an absolute rotation angle sensor, detecting an absolute rotation angle of a rotating component
Data Source
AI summary
In an electronic parking lock apparatus, a relative rotation angle of an electric motor of an actuator is detected by a relative rotation angle sensor, an absolute rotation angle of the electric motor is calculated according to the relative rotation angle and reference rotation position information obtained by a rotation end limiting portion that limits a rotation end of a rotating component. An absolute rotation angle of the rotating component is detected by using an absolute rotation angle sensor, and the working status of the parking lock is determined according to the absolute rotation angle. The rotation end limiting portion used for obtaining the reference rotation position information of the relative rotation angle sensor and a detected component used for enabling the absolute rotation angle sensor to work to obtain the absolute rotation angle are provided in the same rotating component.