Parking Acceleration Control for Smoother Driving Assistance
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Solution Overview
Problem
Existing driving assistance systems can cause vehicle occupants to feel sudden acceleration, either due to the distance to the target position in automatic parking systems or because of the way acceleration is limited to prevent unexpected acceleration states.
Innovation Solution
A driving assistance device that calculates a movement route and determines acceleration based on a predetermined acceleration time and speed limit value, using a route calculation unit, movement control unit, and acceleration determination unit, to ensure smooth and comfortable vehicle movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If acceleration is increased to reach target speed quickly, then productivity is improved, but ride comfort deteriorates due to sudden acceleration sensation
Solution Approach 1:
The patent applies dynamics by making the acceleration profile adaptive rather than fixed. The acceleration determination unit dynamically adjusts acceleration values based on real-time parameters including distance to target position, current vehicle speed, and predetermined acceleration time. This allows the system to optimize acceleration continuously during the parking maneuver, achieving both efficiency and comfort.
Solution Approach 2:
The patent changes multiple parameters simultaneously to resolve the contradiction: acceleration magnitude is adjusted based on distance to target, acceleration timing is optimized using predetermined acceleration time, and speed limits are dynamically set. This multi-parameter approach allows the vehicle to accelerate more aggressively when appropriate while maintaining comfort when needed.
2Reliability
If acceleration is limited to prevent unexpected acceleration states, then safety is improved, but ride comfort deteriorates due to suppressed acceleration response
Solution Approach 1:
The patent implements feedback by continuously monitoring current vehicle speed, distance to target position, and acceleration state. The movement control unit uses this feedback to adjust acceleration commands in real-time, ensuring that acceleration remains within safe limits while avoiding the suppressed response that causes discomfort. The system responds adaptively to the actual vehicle state rather than using fixed limits.
Solution Approach 2:
The acceleration limits are not fixed but dynamic, changing based on vehicle speed, distance to target, and current acceleration. This allows the system to permit higher acceleration when safe and appropriate, while automatically reducing acceleration when approaching safety boundaries, thereby maintaining both safety and comfort.
3Productivity
If target speed is reached quickly to improve parking efficiency, then productivity is improved, but ride comfort deteriorates due to abrupt speed changes
Solution Approach 1:
The patent applies preliminary action by pre-determining optimal acceleration time and acceleration profiles before executing the parking maneuver. The acceleration determination unit calculates the appropriate acceleration in advance based on distance to target and current speed, allowing the vehicle to smoothly transition to target speed without abrupt changes. This pre-planning enables efficient speed achievement while maintaining comfort.
Solution Approach 2:
The system dynamically adjusts the rate of speed change based on real-time conditions. Rather than using fixed acceleration rates, the movement control unit continuously optimizes acceleration to reach target speed efficiently while keeping the acceleration profile smooth and comfortable for occupants.
Data Source
AI summary
A driving assistance device performs driving assistance of a vehicle on a basis of surrounding information collected by a plurality of sensors provided in the vehicle. The driving assistance device includes: a route calculation unit configured to calculate a movement route of the vehicle to a target position on a basis of the surrounding information from the plurality of sensors; a movement control unit configured to move the vehicle along the movement route at a target speed within a speed limit value according to a current situation of the vehicle; and an acceleration determination unit configured to determine acceleration at which the vehicle reaches the target speed on a basis of a predetermined acceleration time and the speed limit value.