Vehicle Braking Device Low Speed Obstacle Detection Logic
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Solution Overview
Problem
Conventional braking devices for vehicles, when installed together, are not compatible, leading to failure in operating automatic braking when the accelerator pedal is operated near obstacles, resulting in inadequate collision prevention and potential damage.
Innovation Solution
A braking device comprising an accelerator-opening detector, distance detector, obstacle detector, and controller that executes automatic braking when the vehicle approaches a specified distance from an obstacle, cancels it based on accelerator opening, but prohibits cancellation when the obstacle is detected at low speeds, ensuring proper deceleration or stopping, and allows cancellation at higher speeds for intentional acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the braking device cancels automatic braking when the accelerator opening is a specified opening or greater, then the vehicle can be accelerated surely, but the automatic braking cannot be executed properly when the obstacle is detected in front of the vehicle at low speed
Solution Approach 1:
The control device applies different automatic braking cancellation rules to different operating conditions: when the vehicle is traveling at a low speed (below specified speed) with an obstacle detected, the accelerator opening threshold for cancellation is set to a higher value, while when traveling at normal speeds, the lower threshold applies. This localized differentiation resolves the contradiction by ensuring safety at low speeds while maintaining responsiveness at higher speeds.
Solution Approach 2:
The control device dynamically adjusts the automatic braking cancellation condition based on real-time vehicle speed and obstacle detection status. The cancellation threshold is not fixed but changes according to the operating state, allowing the system to adapt between safety-critical low-speed scenarios and normal operating conditions, thereby resolving the contradiction between reliable braking execution and acceleration capability.
2Reliability
If the collision prevention control device limits starting or accelerating when the distance to obstacle is specified distance or less, then the vehicle can be prevented from colliding with obstacle, but the braking device recognizes accelerator operation as intentional and cancels automatic braking control
Solution Approach 1:
The control device merges the functions of the braking device and collision prevention control device into a unified control system. By integrating obstacle detection, distance measurement, and automatic braking control into a single coordinated system, the patent eliminates the incompatibility between the two separate devices, allowing them to work together harmoniously to achieve both collision prevention and proper braking control.
Solution Approach 2:
The control device acts as an intermediary that coordinates between the collision prevention control device and braking device. It receives inputs from both systems, processes them according to integrated logic that considers vehicle speed and obstacle conditions, and outputs coordinated control signals, thereby resolving the compatibility issue between the two devices.
Data Source
AI summary
A braking device for a vehicle comprises an accelerator-opening detector, a distance detector, an obstacle detector, and an ECU which is configured to perform the process of executing automatic braking when the distance detected by the distance detector is a specified distance or less during traveling of the vehicle, cancelling the automatic braking when the accelerator opening detected by the accelerator-opening detector is a specified opening or greater, and prohibiting the cancelling of the automatic braking when the front obstacle is detected by the obstacle detector while the vehicle stops or travels at a low speed which is a specified speed or less. Thereby, the braking device for a vehicle which can surely reduce the damage caused by the vehicle's collision with the front obstacle can be provided.