Vehicle Roll Stability Control Predictive Lateral Acceleration
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Solution Overview
Problem
Existing roll stability control systems for vehicles can only account for current driving dynamics and short-term curve extrapolations, leading to unnecessary braking interventions when the curve radius increases or changes, causing driver irritation and unsafe vehicle operation.
Innovation Solution
A method that predicts future lateral acceleration values by analyzing curve information from sensors or map systems, allowing for dynamic adjustment of deceleration requests to ensure safe vehicle operation by reducing or withdrawing braking interventions when the risk of tipping over decreases, such as when the curve widens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If deceleration request is based only on current driving dynamics parameters and short-term extrapolation, then the system can respond quickly to current conditions, but unnecessary braking interventions occur when curve radius increases, causing driver irritation
Solution Approach 1:
The system performs preliminary actions by detecting the future course of the curve in advance using sensor systems or map data, and adjusts the deceleration request proactively before the vehicle reaches positions where braking would no longer be necessary. This prevents unnecessary braking interventions while maintaining quick response to actual risk conditions.
Solution Approach 2:
The system continuously monitors current driving dynamics parameters, predicted lateral acceleration values, and actual curve progression, then adjusts the deceleration request dynamically based on this feedback loop. When predicted lateral acceleration falls below the limit, the system reduces or withdraws braking intervention, aligning vehicle response with the observed environment and driver expectations.
2Reliability
If deceleration request is maintained based on initial curve conditions, then rollover prevention is ensured, but unnecessary braking continues when curve widens, reducing drivability
Solution Approach 1:
The system dynamically adapts the deceleration request based on the evolving curve conditions. Instead of maintaining a static braking level, the system continuously adjusts the deceleration request as the vehicle progresses through the curve, reducing braking when the curve widens or straight sections are detected, thereby maintaining both safety and drivability.
Solution Approach 2:
The system changes the deceleration parameter dynamically based on predicted lateral acceleration values and actual curve progression. When predicted lateral acceleration falls below the limit value, the system modifies the deceleration request parameter to reduce or withdraw braking intervention, optimizing both safety and operational efficiency throughout the curve traversal.
3Force
If future curve radius is estimated using camera-based systems, then proactive speed adjustment is possible, but system complexity and cost increase
Solution Approach 1:
The system achieves future curve detection using existing multi-functional sensor systems already present in the vehicle (cameras for driver assistance systems, radar, LIDAR, or map data from navigation systems). These sensors serve multiple purposes including obstacle detection, lane recognition, and now future curve prediction, avoiding additional dedicated hardware while enabling proactive control.
Data Source
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AI summary
The invention relates to a method for controlling a vehicle (1), particularly a utility vehicle (1), when travelling on a bend (K), the utility vehicle (1) comprising a roll stability control system (10) for determining the probability (W) of overturning, said method comprising at least the following steps: determining bend information (R, R2), the bend information characterising the shape of the bend (K) in the direction of travel (F) from a current position (P) of the vehicle (1); determining predicted lateral acceleration values (alat_pi) according to the bend information (R, R2), the predicted lateral acceleration values (alat_pi) respectively indicating a lateral acceleration (alat) expected to act on the vehicle (1) in future positions (Pi) further along the bend (K); and determining the probability (W) of overturning in the future positions (Pi) according to the predicted lateral acceleration values (alat_pi). According to the invention, a reduced deceleration request is output by the roll stability control system (10) when the predicted lateral acceleration values (alat_pi) at least partially fall short of a lateral acceleration threshold value (plat_th), the reduced deceleration request (zSoll_r) being lower than a current deceleration request (zSoll) requested by the roll stability control system (10) in the current position (P), and for the reduced deceleration request (zSoll_r), the predicted lateral acceleration values (alat_pi) still remain lower than the lateral acceleration threshold value (plat_th).