Shift Range Change System Torque Control
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Solution Overview
Problem
The existing shift range change systems for automatic vehicle transmissions face mechanical damage due to excessive torque generation during parking range wall abutment learning, especially when transitioning from the parking range to non-parking ranges, leading to reduced durability and potential mechanical issues.
Innovation Solution
A shift range change system that adjusts the output torque of the electric motor through duty ratio control, providing distinct torque levels for different operational conditions, such as parking release, parking setting, range changes between non-parking ranges, and parking range wall abutment learning, to minimize mechanical stress and optimize torque usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electric motor generates large torque for parking release on slope, then the parking release function is improved, but mechanical damage occurs during P-wall abutment learning
Solution Approach 1:
The patent applies dynamics by making the output torque of the electric motor variable rather than fixed. The motor control apparatus dynamically adjusts the torque level based on the operational phase: using maximum torque for parking release on slope, reduced torque for P-wall abutment learning, and intermediate torque for normal range changes. This dynamic adaptation resolves the contradiction by providing high power when needed while preventing mechanical damage during sensitive operations.
Solution Approach 2:
The patent changes the parameter of output torque based on operational conditions. The motor control apparatus modifies the torque parameter according to the current shift range and operational phase. Specifically, it reduces the torque parameter during P-wall abutment learning compared to parking release operations, thereby preventing mechanical damage while maintaining the ability to perform parking release when required.
2Reliability
If duty ratio control reduces torque during P-wall abutment learning, then mechanical damage is reduced, but insufficient torque may occur when learning from non-parking range
Solution Approach 1:
The patent implements feedback control where the motor control apparatus continuously monitors the current shift range and operational phase. Based on this feedback, it automatically selects the appropriate torque level. When P-wall abutment learning is detected from a non-parking range, the system feedbacks that higher torque is needed and adjusts accordingly, preventing insufficient torque while still protecting against mechanical damage during normal P-range learning.
Solution Approach 2:
The patent applies local quality by providing different torque characteristics for different operational contexts. Instead of a uniform torque reduction during all P-wall abutment learning operations, the system provides locally optimized torque: reduced torque for P-range learning to prevent damage, and adequate torque for non-P-range learning to ensure successful operation. Each operational context receives the appropriate torque quality.
3Power
If the motor always generates maximum torque, then parking release on slope is ensured, but power consumption increases and heat generation occurs
Solution Approach 1:
The patent applies partial action by providing maximum torque only when absolutely necessary (during parking release on slope) rather than continuously. For other operations like P-wall abutment learning and normal range changes, reduced torque levels are sufficient. This partial application of maximum torque significantly reduces power consumption and heat generation while maintaining the critical capability when needed.
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
The system effectively reduces mechanical damage and power consumption by controlling torque levels appropriately, thereby enhancing the durability of components and reducing heat generation during frequent parking range transitions.
Implementation Method 1
an electric rotary actuator which includes an electric motor and drives the shift range change mechanism and the parking change mechanism
Implementation Method 2
The motor control apparatus adjusts an output torque of the electric motor through duty ratio control
Data Source
AI summary
A motor needs to provide a first torque at the time of releasing a shift range from a parking range and needs to provide a second torque smaller than the first torque at the time of placing the shift range into the parking range. Also, the motor needs to provide a third torque smaller than the second torque at the time of changing the shift range from one non-parking range to another non-parking range and needs to provide a fourth torque smaller than the third torque at the time of executing the parking range wall abutment learning. When the parking range wall abutment learning is executed from the parking range, a motor control apparatus controls the torque to the third or fourth torque. When the parking range wall abutment learning is executed from any non-parking range, the motor control apparatus controls the torque to the first or second torque.