Shape-Memory Alloy Actuator for Vehicular Camera Lens Cleaning
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Solution Overview
Problem
Cameras and imaging sensors in vehicles often become obstructed by substances like water, snow, ice, dust, and dirt, leading to reduced functionality, and existing cleaning solutions are inadequate for restoring full functionality.
Innovation Solution
A cleaning device with a movable cleaning element and a mechanism using a shape-memory alloy actuated by electric current to contact the camera lens, combined with a fluid reservoir and dispensing system for effective cleaning and self-test functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cleaning device is added to remove obstructions from imaging sensors, then the reliability of the imaging sensor is improved, but the device complexity increases
Solution Approach 1:
The patent combines the cleaning element, fluid reservoir, and actuation mechanism into an integrated cleaning device assembly that mounts directly to the vehicle. This merging of multiple components into a single unit removes obstructions from imaging sensors without requiring separate complex systems for each function.
Solution Approach 2:
The cleaning device incorporates a fluid reservoir that automatically supplies cleaning fluid to the cleaning element when needed. The system performs self-service by containing its own cleaning medium and delivery mechanism, eliminating the need for external fluid supply systems and reducing overall device complexity.
2Reliability
If a mechanism with multiple components is used to clean the sensing element, then the cleaning effectiveness is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The cleaning device is divided into distinct modular segments: a cleaning element, a fluid reservoir, and an actuation mechanism. Each segment can be manufactured and assembled separately with standard tolerances, reducing the need for high-precision integrated manufacturing while maintaining overall cleaning effectiveness.
Solution Approach 2:
The cleaning element serves multiple functions: it applies cleaning fluid to the sensing element, mechanically wipes the surface, and can be actuated in different positions. This multi-functionality reduces the need for multiple specialized components, thereby lowering manufacturing precision requirements while maintaining cleaning effectiveness.
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 cleaning device effectively removes obstructions from camera lenses, provides automatic self-cleaning, defrosting, and performs online lens calibration and alignment tests, ensuring the camera's functionality and reliability in harsh weather conditions.
Implementation Method 1
The at least one actuator includes a shape-memory alloy
Implementation Method 2
The wiper blade is configured to contact the camera lens and remove obstructions from the camera lens
Data Source
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AI summary
A cleaning device for cleaning a sensing element of a vehicular camera includes a cleaning element movable between a first position and a second position to contact a surface of the sensing element. The cleaning device also includes a mechanism coupled to the cleaning element to move the cleaning element between the first position and the second position.