Camera Iris Controller for Impact-Free Aperture Adjustment
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Solution Overview
Problem
The camera iris in autonomous vehicles experiences physical impacts and reliability issues due to strong magnets, leading to image signal quality deterioration when changing aperture positions, as objects may collide due to attractive forces between the yoke and magnet.
Innovation Solution
A controller system for the camera iris that includes a signal processing circuit, control circuit, and driving circuit, utilizing position sensors to generate detected position values and control driving currents through PID and open-loop controllers to manage the iris movement, thereby minimizing physical impacts and ensuring stable aperture changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If strong magnets are disposed in the iris assembly to maintain stable iris position, then the iris position stability is improved, but physical impacts occur between iris objects due to attractive force between yoke and magnet
Solution Approach 1:
The control circuit performs preliminary detection of the iris current position using position sensors before actuation, and pre-calculates the required driving current to overcome magnetic attractive forces gradually, preventing sudden impacts when the iris transitions between aperture positions
Solution Approach 2:
The system dynamically adjusts the driving current based on real-time feedback from position sensors during iris movement, modulating the coil current to balance the magnetic attractive forces and maintain controlled, impact-free motion throughout the aperture transition
2Stability of the object's composition
If strong magnets are used to maintain iris position, then position stability is improved, but the lifespan of the iris deteriorates due to extended shaking after impact
Solution Approach 1:
Position sensors continuously monitor the iris position and provide feedback to the control circuit, which adjusts the driving current in real-time to dampen oscillations and prevent extended shaking, thereby extending the iris lifespan while maintaining position stability
Solution Approach 2:
The control circuit applies periodic adjustments to the driving current during iris movement to counteract oscillatory tendencies, using small corrective current pulses to gradually reduce vibrations and settle the iris position without causing mechanical stress
3Stability of the object's composition
If strong magnets are disposed in the iris assembly, then iris position stability is improved, but image signal quality deteriorates due to physical impact
Solution Approach 1:
The control circuit detects the iris current position and pre-calculates the optimal driving current before actuation, ensuring smooth transitions that prevent physical impacts and maintain consistent image signal quality throughout the aperture change process
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 solution effectively prevents iris shaking and extends its lifespan, ensuring reliable image quality by optimizing the control of iris movement between aperture positions, reducing physical impacts and maintaining image signal integrity.
Implementation Method 1
a coil that is configured to drive the iris
Implementation Method 2
the attractive force between the yoke and the magnet
Data Source
AI summary
A controller of a camera iris is provided. The controller includes a signal processing circuit that generates a detected position value corresponding to a current position of the iris, based on first and second sensing signals respectively received from first and second position sensors that detects an aperture position of the iris; a control circuit, that sets a section between the first aperture position and the second aperture position to a plurality of control sections, and if a command to change the aperture of the iris is made, performing a corresponding control operation for each of the plurality of control sections to control a movement operation of the iris, based on the detected position value; and a driving circuit that generates a driving current, and provide the generates driving current to a coil to drive the iris under control of the controller.