Vehicle Control Device for Dynamic Acceleration Limiting
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Solution Overview
Problem
Autonomous driving vehicles face challenges in setting appropriate upper limit values for acceleration and deceleration to balance vibration reduction and traveling performance, especially when transporting occupants or packages, as existing techniques do not adequately consider varying conditions such as occupant presence, posture, seatbelt use, disability, age, package weight, and desired arrival times.
Innovation Solution
A control device and occupant transportation system that includes an upper limit value setting unit and vehicle controller, which adjusts the upper limit value of acceleration or deceleration based on predetermined conditions like occupant presence, posture, package weight, and desired arrival times, ensuring safe and efficient travel by limiting acceleration or deceleration according to specific criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the upper limit value of acceleration or deceleration is set to be small, then the vibration of the vehicle is reduced, but the traveling performance of the vehicle is degraded
Solution Approach 1:
The patent applies dynamics by making the upper limit value of acceleration or deceleration variable rather than fixed. The control device dynamically adjusts the upper limit value based on detected conditions such as occupant presence, posture, seatbelt status, disability, age, package presence, weight, and strength. This allows the system to optimize between vibration reduction and traveling performance in real-time according to the current situation.
Solution Approach 2:
The patent implements parameter changes by modifying the acceleration/deceleration limit parameter based on multiple conditions. When conditions indicate higher risk (e.g., occupants present, fragile packages), the system reduces the upper limit value to minimize vibration and potential harm. When conditions allow (e.g., no occupants, robust packages), the system increases the upper limit value to improve traveling performance.
2Reliability
If the upper limit value of acceleration or deceleration is set to be small, then the safety of the occupant is improved, but the traveling performance of the vehicle is degraded
Solution Approach 1:
The system dynamically adjusts the acceleration/deceleration upper limit based on real-time detection of occupant conditions. When occupants are detected (through presence detection, posture detection, seatbelt status, or declared disability/age), the system lowers the upper limit to prioritize safety. When no occupants are present or conditions permit, the system raises the limit to maintain traveling performance.
Solution Approach 2:
The patent changes the safety parameter (upper limit value) based on multiple occupant-related conditions. The system evaluates factors such as occupant presence, posture stability, seatbelt fastening, declared disability, and age to determine the appropriate safety level, adjusting the acceleration/deceleration limits accordingly to balance safety and performance.
3Adaptability or versatility
If the upper limit value is adjusted based on multiple conditions, then the appropriateness of the setting is improved, but the device complexity is increased
Solution Approach 1:
The patent segments the condition detection into multiple independent detection units or modules, each responsible for detecting a specific condition (occupant presence, posture, seatbelt status, disability, age, package presence, weight, strength). This modular approach allows the system to handle multiple conditions without excessive complexity, as each detection function can be implemented independently and combined in the control logic.
Solution Approach 2:
The control device is designed with multi-functionality to handle various detection results and adjust the upper limit value accordingly. A single control device integrates multiple detection functions and decision-making logic, making it universal enough to handle different scenarios (occupants, packages, combined loads) without requiring separate systems for each condition type.
Data Source
AI summary
A control device for a vehicle includes an upper limit value setting unit configured to set an upper limit value of an acceleration or deceleration of the vehicle, and a vehicle controller configured to control the vehicle such that the acceleration or deceleration does not exceed the upper limit value. The upper limit value setting unit is configured to change the upper limit value according to at least one predetermined condition.