Range Switch Motor Control for Thermal Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Frequent range switch operations in vehicles can lead to excessive heat generation in motor coils and drive circuits, reducing the system's lifespan and causing malfunctions due to inadequate motor cooling periods when occupants engage in unnecessary shifting for pleasure while the vehicle is stopped.
Innovation Solution
A controlling device that includes a range switch mechanism, operation frequency monitoring means, and heat generation limit controlling means to detect and limit heat generation by switching to a heat generation limit control when the operation frequency exceeds a predetermined threshold, thereby inhibiting unnecessary range switch operations and preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the motor is frequently started and stopped to change shift range, then the shift range can be changed according to occupant needs, but the motor coil and drive circuit generate excessive heat reducing system lifespan
Solution Approach 1:
The control device performs preliminary action by detecting operation frequency before excessive heat generation occurs. When the operation frequency exceeds a predetermined threshold, the control device preemptively switches to heat generation limit control, preventing the motor coil and drive circuit from reaching dangerous temperature levels before they can cause damage.
Solution Approach 2:
The control device dynamically adjusts the motor control strategy based on real-time operation frequency detection. It transitions between normal control mode (when operation frequency is within limits) and heat generation limit control mode (when operation frequency exceeds thresholds), optimizing both shift range changeability and thermal management throughout system operation.
2Productivity
If the motor operates continuously to respond to frequent range switch operations, then all shift range changes can be executed, but the motor cooling period is shortened or eliminated causing temperature increase
Solution Approach 1:
The control device implements feedback control by continuously monitoring the operation frequency of the range switch mechanism. This feedback information is used to adjust the motor control strategy in real-time, switching to heat generation limit control when the feedback indicates that operation frequency has exceeded safe thresholds, thereby preventing excessive temperature rise.
Solution Approach 2:
The control device changes operational parameters by switching between different control modes based on operation frequency. When operation frequency exceeds the predetermined threshold, it changes the motor control parameters to limit heat generation, effectively managing the trade-off between productivity and temperature control through parameter adjustment.
3Ease of operation
If the motor and drive circuit are energized frequently, then the shift range can be changed as needed, but the heat generation causes malfunction and reduces duration of life
Solution Approach 1:
The control device replaces purely mechanical operation with an electronically controlled system that monitors operation frequency and automatically adjusts control strategies. This electronic control system substitutes for mechanical wear and thermal damage by preventing excessive operation through intelligent control, thereby improving reliability while maintaining ease of operation.
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
Effectively limits the increase in temperature due to heat generation, prolonging the system's lifespan and preventing malfunctions by inhibiting excessive heat buildup during frequent range switch operations, while also warning occupants to avoid unnecessary shifting.
Implementation Method 1
While the motor is energized, a coil of the motor and a drive circuit generate heat
Implementation Method 2
While the motor is stopped, the heat generated by the energization of the motor is released such that a temperature of the motor is lowered
Data Source
AI summary
A controlling device includes a range switch mechanism, range switch operating means, operation frequency monitoring means, and heat generation limit controlling means. The range switch mechanism is adapted to change a shift range using a motor. Through the range switch operating means, an occupant inputs a required shift range. The motor is controlled in accordance with the required shift range such that the shift range is changed into the required shift range. The operation frequency monitoring means monitors an operation frequency of the range switch operating means. The heat generation limit controlling means switches a control of the motor to a heat generation limit control when the operation frequency of the range switch operating means exceeds a predetermined frequency.