Power Trunk Velocity Control via PID Feedback
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Solution Overview
Problem
Existing power trunk control systems fail to maintain consistent open/close velocity regardless of external environments such as temperature or vehicle inclination, requiring complex control systems and profiles.
Innovation Solution
A system and method using a motor, velocity sensing unit, and control unit with a PID control scheme to compare and compensate for differences between target and operational velocities, adjusting the PWM duty ratio to maintain consistent trunk velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the duty ratio increases or decreases at a constant rate to control trunk velocity, then the control method is simple, but the trunk velocity cannot be constantly maintained regardless of external environments
Solution Approach 1:
The patent implements a feedback control mechanism by sensing the actual trunk velocity and comparing it with the target velocity. The control unit adjusts the PWM duty ratio based on the velocity difference (error signal) to maintain consistent trunk velocity. This closed-loop feedback system resolves the contradiction by automatically compensating for environmental variations while maintaining reasonable control complexity.
Solution Approach 2:
The patent dynamically changes the PWM duty ratio parameter based on the velocity error signal. Instead of using a fixed constant rate of duty ratio change, the system adjusts the duty ratio proportionally to the velocity difference, enabling adaptive velocity control that maintains consistency across different external conditions.
2Device complexity
If the duty ratio is adjusted at a constant rate, then the control system is simple, but the trunk velocity varies with external environment changes
Solution Approach 1:
The control unit continuously monitors trunk velocity through the sensing unit and adjusts the PWM duty ratio based on the velocity error. This feedback mechanism ensures stable velocity control without requiring an overly complex system architecture, resolving the contradiction between simplicity and stability.
Solution Approach 2:
The control system automatically adjusts itself by comparing actual velocity with target velocity and modifying the duty ratio accordingly. This self-regulating capability maintains velocity stability without requiring external intervention or complex control algorithms.
3Ease of operation
If no velocity compensation is applied, then the control method is simple, but the trunk velocity cannot be maintained constant during driving
Solution Approach 1:
The velocity sensing unit provides real-time feedback on trunk velocity, enabling the control unit to compensate for environmental changes. This feedback loop allows the system to adapt to different conditions while maintaining a relatively simple control structure, resolving the contradiction between simplicity and adaptability.
Solution Approach 2:
The system dynamically adjusts the PWM duty ratio parameter in response to velocity errors caused by environmental changes. This parameter adaptation enables the trunk to maintain consistent velocity across varying conditions without requiring a fundamentally complex control approach.
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
Enables stable and consistent control of power trunk open/close velocity regardless of external environment changes, simplifying the control method and improving stability.
Implementation Method 1
a velocity sensing unit configured to sense a velocity of the motor; The velocity sensing unit may be a Hall sensor.
Data Source
AI summary
Disclosed is a system for controlling a power trunk in a trunk-equipped vehicle, including: a motor configured to transfer power to the trunk to drive the trunk; a velocity sensing unit configured to sense a velocity of the motor; a control unit configured to compute a current trunk position and an operational velocity based on information on the velocity of the motor sensed by the velocity sensing unit and control the motor based on the computed position and the operational velocity, wherein a predetermined target velocity and the operational velocity are compared, and a difference between the target velocity and the operational velocity is compensated using a proportional integral derivative (PID) control scheme. It is possible to constantly control an open/close velocity of a power trunk regardless of a change of external environments when a power trunk is opened or closed in a vehicle having a power trunk system.