Display-Image Switching Apparatus Using Provisional Vehicle Speed
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Solution Overview
Problem
Existing display-image switching apparatuses for vehicles experience undesired and frequent image switching during Anti-Lock Brake System (ABS) operation due to fluctuations in wheel speed, leading to a flickering display and reduced user-friendliness.
Innovation Solution
A display-image switching apparatus and method that determine a provisional vehicle speed, which represents the speed the vehicle would travel if the ABS were not operating, and use this speed to control image switching between camera and navigation images, preventing unnecessary switching during ABS operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If display image switching is based on wheel-speed-based vehicle speed, then the display image can be switched in accordance with vehicle speed, but frequent and undesired switching occurs during ABS operation due to wheel speed fluctuations
Solution Approach 1:
The patent introduces an intermediary variable called 'provisional vehicle speed' that mediates between the fluctuating wheel-speed-based vehicle speed and the display image switching control. This provisional speed represents the vehicle speed if ABS were not operating, filtering out the harmful fluctuations while preserving the useful speed information for appropriate display switching.
Solution Approach 2:
The patent extracts the harmful fluctuation component from the wheel-speed-based vehicle speed during ABS operation by separating the ABS-induced fluctuations from the actual vehicle speed trend, using only the extracted stable speed information for display switching decisions.
2Adaptability or versatility
If display image switching is based on wheel-speed-based vehicle speed, then switching can occur at low speeds, but the display image becomes hard to recognize due to repeated switching between navigation image and vehicle camera image
Solution Approach 1:
The provisional vehicle speed acts as an intermediary that preserves the adaptability to switch displays at various speeds while filtering out the harmful high-frequency fluctuations that cause flickering, thus maintaining both versatility and image recognizability.
3Device complexity
If wheel speed is used to determine vehicle speed, then vehicle speed can be obtained from existing sensors, but the accuracy is limited and fluctuations occur significantly during ABS operation
Solution Approach 1:
The patent converts the harmful wheel speed fluctuations during ABS operation into beneficial information by detecting ABS operation status and using this knowledge to calculate a provisional vehicle speed that represents the true vehicle speed trend, transforming a measurement problem into a solution.
Data Source
AI summary
A display-image switching apparatus that switches the image shown in a display includes: an antilock brake system operation determination portion that determines whether an antilock brake system of the vehicle is operating; a provisional vehicle speed calculation portion that calculates a provisional vehicle speed that represents a speed at which the vehicle would travel if the antilock brake system were not operating; and a display-image switching portion that switches the displayed image based on the provisional vehicle speed if the antilock brake system is operating.