Distance Regulating System Curve Acceleration Control
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Solution Overview
Problem
Existing distance regulating systems for motor vehicles are optimized for straight roads and struggle to manage longitudinal and transverse accelerations effectively on winding routes, leading to high total accelerations and an unsettled driving experience.
Innovation Solution
A distance regulating system that uses a combination of sensors and a control unit to adjust longitudinal acceleration based on expected transverse acceleration, detected through route analysis, ensuring a constant total acceleration by reducing longitudinal acceleration in curves and utilizing a circle of forces model to maintain safe tire friction limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance regulating system accelerates the motor vehicle with a preset acceleration on straight roads, then the distance to the motor vehicle travelling ahead is maintained, but on winding routes the longitudinal acceleration combined with transverse acceleration results in high total accelerations
Solution Approach 1:
The control unit determines an expected transverse acceleration in the event of a curve lying ahead that is detected by the route detection, and adjusts the longitudinal acceleration as a function of the expected transverse acceleration. This preliminary adjustment prevents excessive total acceleration before the vehicle enters the curve.
Solution Approach 2:
The system dynamically adjusts the longitudinal acceleration parameter based on the expected transverse acceleration from route detection. When a curve is detected, the longitudinal acceleration is reduced to compensate for the upcoming transverse acceleration, maintaining a safe total acceleration level.
2Productivity
If the longitudinal acceleration is increased to catch up with the motor vehicle travelling ahead, then the distance regulation is improved, but the safety in travelling mode is compromised due to dangerous curve speeds
Solution Approach 1:
The route detection detects a route section lying in front of the motor vehicle, and the control unit determines expected transverse acceleration for upcoming curves. This allows the system to proactively reduce longitudinal acceleration before entering curves, preventing dangerous curve speeds while maintaining distance regulation on straight sections.
Solution Approach 2:
The system uses route detection feedback to continuously monitor the upcoming road geometry and adjusts longitudinal acceleration accordingly. This closed-loop control ensures that acceleration commands are safe for the detected route conditions while maintaining effective distance regulation.
Data Source
AI summary
A distance regulating system is disclosed for the automatic adjusting of a distance of a motor vehicle to a motor vehicle travelling ahead. At least one sensor detects the distance to the motor vehicle travelling ahead. A route detector detects a route section lying ahead. A control unit is equipped in order to transmit acceleration commands to a drive of the motor vehicle, to accelerate with a preset acceleration upon increasing distance to the motor vehicle travelling ahead or during open straight-ahead travel. The control unit can determine a transverse acceleration to be expected and adjust a longitudinal acceleration as a function of the transverse acceleration to be expected when a curve lying ahead is detected by the route detection.