Vehicle Control Device Stabilizing Turning via Lateral Acceleration Feedback
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Solution Overview
Problem
Existing vehicle control systems that stabilize turning behavior by adjusting driving and braking forces often cause unintentional longitudinal acceleration, leading to uncomfortable shocks for the driver and inadequate turning performance.
Innovation Solution
A vehicle control system that includes lateral acceleration and jerk detection to determine and limit the changing amount and rate of driving/braking force corrections, using a differential threshold based on a hyperbolic curve to prevent uncomfortable feelings and shocks, while optimizing turning performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driving force is corrected to stabilize turning behavior, then turning performance is improved, but unintentional longitudinal acceleration occurs causing shocks and uncomfortable feeling
Solution Approach 1:
The patent changes the parameters of driving force correction by introducing lateral acceleration and jerk as control variables. The correction amount and changing rate are dynamically adjusted based on detected lateral acceleration and jerk values, allowing the system to optimize turning performance while preventing uncomfortable shocks by maintaining correction changes within driver-perceptible thresholds.
2Object-affected harmful factors
If the correction amount of driving force is reduced to reduce shocks, then uncomfortable feeling is reduced, but turning performance cannot be improved effectively
Solution Approach 1:
The patent implements dynamic adjustment of correction parameters based on real-time detection of lateral acceleration and jerk. The correction amount and changing rate are not fixed but are continuously optimized according to current vehicle state, allowing the system to achieve effective turning performance improvement while keeping correction changes within acceptable comfort thresholds.
3Speed
If the changing rate of driving force correction is increased to improve response, then control response is improved, but shocks and unstable feeling are generated
Solution Approach 1:
The patent employs feedback control by continuously detecting lateral acceleration and jerk, then using this information to adjust the driving force correction. The changing rate of correction is limited based on detected jerk values, creating a feedback mechanism that improves control response while preventing shocks by maintaining correction changes within driver-perceptible thresholds.
Data Source
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AI summary
A vehicle control system configured to stabilize a behavior of a vehicle during turning by correcting a driving force or a braking force. The vehicle control system comprises a lateral acceleration detecting means detecting longitudinal acceleration acting in an axle direction of the vehicle Ve (step S102); and a driving/braking force correcting means determining a changing amount Fctrl and a changing rate DFctrl of the correction based on the lateral acceleration Gy in case the running vehicle Ve is turned.