Vehicle Passing Control Using Relative Speed Thresholds
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Solution Overview
Problem
Existing vehicle traveling control systems fail to account for target objects outside the vehicle's traffic lane, leading to passenger uneasiness and potential brake override when passing such objects.
Innovation Solution
A traveling control apparatus that detects target objects outside the vehicle's lane, calculates relative speed, and sets a target acceleration within a predetermined range to ensure a smooth pass, thereby reducing passenger uneasiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the vehicle travels at high speed to efficiently pass target objects, then productivity is improved, but passenger uneasiness increases and brake override may occur
Solution Approach 1:
The system dynamically changes the acceleration parameter based on the relative speed between the host vehicle and target object. When relative speed is below the threshold, acceleration is applied to maintain passing efficiency; when relative speed exceeds the threshold, acceleration is reduced or canceled to prevent passenger uneasiness, thus resolving the contradiction between productivity and passenger comfort
Solution Approach 2:
The system continuously monitors the relative speed between the host vehicle and target object, and uses this feedback to adjust the acceleration command. This closed-loop control ensures that the vehicle maintains efficient passing speed while preventing excessive acceleration that would cause passenger discomfort or brake override
2Object-affected harmful factors
If the vehicle decelerates to reduce passenger uneasiness when passing target objects, then passenger comfort is improved, but traveling time increases
Solution Approach 1:
The system changes the acceleration parameter dynamically: maintaining positive acceleration when relative speed is below threshold to minimize time loss, and reducing or canceling acceleration when relative speed exceeds threshold to ensure passenger comfort, thus balancing time efficiency and comfort
3Productivity
If the vehicle maintains constant acceleration to efficiently pass target objects, then productivity is improved, but passenger comfort deteriorates when relative speed is high
Solution Approach 1:
The system transitions from constant acceleration to dynamic acceleration control. The acceleration command is adjusted in real-time based on relative speed feedback, being positive when relative speed is low (maintaining productivity) and reduced or canceled when relative speed is high (ensuring comfort), thus resolving the contradiction between constant performance and conditional comfort
Data Source
AI summary
A traveling control apparatus detects a target object that is present ahead in a travelling direction of an own vehicle and is not present in an own traffic lane or within an own vehicle width. This control apparatus detects a relative speed of the target object relative to the own vehicle along the travelling direction. The control apparatus sets a target acceleration of the own vehicle along the travelling direction. The control apparatus enables the own vehicle to travel at the set target acceleration and to pass a side of the target object. In response to the relative speed being equal to or greater in magnitude than a first threshold that is a predetermined negative value, the control apparatus sets the target acceleration to be within a range from the first threshold speed to a second threshold speed that is a predetermined negative value that is greater in magnitude than the first threshold speed.