Vehicle Control Device Passing Restraint Logic
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Solution Overview
Problem
Existing vehicle control systems face challenges in determining appropriate passing operations, leading to inappropriate passing maneuvers due to changes in relative speed and road conditions, which can result in longer passing times and disrupted traffic flow.
Innovation Solution
A vehicle control device that includes a preceding vehicle recognition unit, road information acquisition unit, passing request determination unit, passing restraint determination unit, traveling plan generation unit, and traveling control unit, which assesses various conditions such as inter-vehicle distance, relative speed, road features, and vehicle states to generate and execute a traveling plan that either allows or restrains passing based on thresholds and flags.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If passing operation is determined based on relative speed threshold, then passing decision is simple and quick, but inappropriate passing occurs when relative speed decreases due to preceding vehicle acceleration or host vehicle deceleration
Solution Approach 1:
The system performs preliminary actions by establishing both passing request flags (when conditions favor passing) and passing restraint flags (when conditions favor restraining passing) based on multiple parameters including relative speed, inter-vehicle distance, and road information. This preliminary classification allows the system to make reliable passing decisions by comparing multiple conditions before executing the passing maneuver, preventing inappropriate passing when relative speed changes occur.
2Reliability
If passing operation is stopped due to decrease in relative speed, then safety is improved, but passing efficiency decreases and lane change and acceleration operations come to nothing
Solution Approach 1:
The system performs preliminary classification by establishing passing request flags and passing restraint flags based on multiple parameters including relative speed, inter-vehicle distance, and road information before executing passing maneuvers. This allows the system to maintain safety while improving efficiency by only restraining passing when multiple conditions indicate it is inappropriate, rather than stopping passing operations solely based on relative speed decrease.
Solution Approach 2:
The system dynamically adjusts passing decisions by continuously monitoring multiple parameters (relative speed, inter-vehicle distance, road information) and updating passing request and restraint flags accordingly. This dynamic approach allows the system to maintain passing operations when conditions remain favorable despite temporary relative speed changes, while still ensuring safety by restraining passing when conditions deteriorate.
3Reliability
If passing operation is performed during decrease in relative speed, then passing may be completed, but passing time increases longer than normal
Solution Approach 1:
The system performs preliminary classification by establishing passing request flags and passing restraint flags based on multiple parameters including relative speed, inter-vehicle distance, and road information. This allows the system to identify and avoid passing operations that would result in prolonged passing times by restraining passing when conditions indicate it is inappropriate, thereby reducing time loss while still completing necessary passing maneuvers when conditions are favorable.
Data Source
AI summary
A passing restraint flag for restraining a host vehicle from passing a preceding vehicle ahead is established by a passing restraint determination unit of the vehicle control device. In addition, when the passing restraint flag is established, a traveling plan for the host vehicle not to pass the preceding vehicle ahead is generated by a traveling plan generation unit of the vehicle control device. The passing restraint determination unit establishes the passing restraint flag when there is the possibility of an inappropriate operation of passing occurring such as when a distance between a merging point of a traveling lane along which the host vehicle travels and a merging lane merging into the traveling lane, and a position of the preceding vehicle having passed through the merging point is equal to or less than a third threshold.