Travel Assistance Device Collision Avoidance
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Solution Overview
Problem
Existing travel assistance devices do not consider the location of objects, such as pedestrians or vehicles, on roadways or sidewalks, leading to inadequate collision avoidance strategies.
Innovation Solution
A travel assistance device with an electronic control unit that predicts the future positions of vehicles and objects, sets assistance ranges based on their locations, and adjusts avoidance conditions and movement ranges to prioritize collision avoidance when objects are on roadways over sidewalks, using actuators to apply appropriate braking forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the assistance range is set large to detect objects on sidewalks, then detection coverage is improved, but false detection increases
Solution Approach 1:
The patent applies different assistance range settings based on the location of detected objects. When an object is detected on a roadway, a larger assistance range is used to ensure comprehensive detection. When an object is detected on a sidewalk, a smaller assistance range is used to reduce false detections. This location-dependent differentiation resolves the contradiction between detection coverage and false detection rate.
2Reliability
If braking force is applied early to ensure safety, then collision avoidance is improved, but passenger comfort deteriorates
Solution Approach 1:
The patent applies different braking strategies based on object location. When an object is detected on a roadway (high collision risk), early and stronger braking is applied to ensure safety. When an object is detected on a sidewalk (low collision risk), braking is delayed or reduced in intensity to maintain passenger comfort. This location-based differentiation resolves the contradiction between collision avoidance reliability and passenger comfort.
3Reliability
If the assistance range is set small to reduce false detection, then detection accuracy is improved, but detection coverage deteriorates
Solution Approach 1:
The patent dynamically adjusts the assistance range based on the detected location of objects. The system switches between a larger assistance range (when objects are on roadways) and a smaller assistance range (when objects are on sidewalks). This dynamic adjustment allows the system to maintain detection accuracy while ensuring adequate detection coverage when needed.
4Ease of operation
If braking is delayed to improve passenger comfort, then passenger comfort is improved, but collision avoidance reliability deteriorates
Solution Approach 1:
The patent implements location-dependent braking timing. When objects are detected on roadways, braking is initiated early to ensure collision avoidance reliability. When objects are detected on sidewalks, braking is delayed to improve passenger comfort. This differential approach resolves the contradiction between collision avoidance reliability and passenger comfort by adapting to the specific situation.
Data Source
AI summary
A travel assistance device includes an actuator and an electronic control unit. The electronic control unit is configured to predict a future position of a vehicle and an object, set an assistance range around the vehicle, determine whether an avoidance start condition is satisfied and in which of a first roadway area, a second roadway area, and a sidewalk area the object is positioned, set the avoidance start condition and a movement range of the object, so that the avoidance start condition is more easily determined to be satisfied when the object is in the first roadway area than when the object is in the second roadway area, and more easily determined to be satisfied when the object is in the second roadway area than when the object is in the sidewalk area, and perform a collision avoidance operation when the avoidance start condition is satisfied.