Predictive Curve Tilting Control for Active Vehicle Chassis
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Solution Overview
Problem
Existing active chassis systems with curve tilting functions in vehicles face challenges such as time delays in establishing tilting angles, constant establishing and eliminating of tilting angles during rapid curve changes, and difficulty in distinguishing between compensatory steering and curve completion, leading to compromised performance and comfort.
Innovation Solution
Incorporating a prediction unit into the curve tilting function that uses road map data to anticipate upcoming curve radii, allowing for earlier establishment of tilting angles and reducing latency, as well as enabling the system to differentiate between compensatory steering and curve completion to optimize tilting angle adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the maximum tilting angle is increased to achieve greater compensation of transverse acceleration, then the curve tilting performance is improved, but the time delay in establishing the tilting angle increases and the natural feel for passengers deteriorates
Solution Approach 1:
The prediction unit determines the tilting angle in advance based on anticipated curve geometry from road map data before the vehicle actually enters the curve. This preliminary calculation allows the control system to prepare the optimal tilting angle beforehand, eliminating the delay that would occur if waiting for sensor data after curve entry. The system performs the tilting angle determination action before the physical curve negotiation begins.
2Productivity
If the tilting angle is established quickly at the beginning of the curve, then the transverse acceleration compensation is improved, but the tilting angle rate increases and passenger comfort deteriorates
Solution Approach 1:
The control system dynamically adjusts the tilting angle based on real-time vehicle state and curve characteristics. The prediction unit provides anticipated curve geometry that allows the system to plan the tilting angle trajectory, while the control unit triggers actuators to achieve the desired angle, balancing establishment speed with acceptable angle rate to maintain passenger comfort.
3Stability of the object's composition
If the tilting angle is maintained during compensatory steering movements, then the curve tilting function stability is improved, but the adaptability to different driving scenarios deteriorates
Solution Approach 1:
The system continuously monitors current vehicle state parameters and compares them with the predicted curve negotiation requirements. The control unit adjusts the tilting angle based on feedback from vehicle sensors and updated prediction data, allowing the system to distinguish between compensatory steering and curve completion scenarios and adapt the tilting angle accordingly.
Data Source
AI summary
A vehicle having an active chassis system with curve tilting function, comprises a control unit, which when negotiating a curve determines a vehicle tilting angle on the basis of a current vehicle transverse acceleration or a correlated driving operation parameter, by which the vehicle transverse acceleration can be reduced, wherein the control unit uses the vehicle tilting angle so determined to trigger actuators of a suspension/shock absorbing system in order to adjust the vehicle tilting angle. The curve tilting function incorporates a prediction unit which provides the curve negotiation data for an upcoming curve. The vehicle tilting angle is set in consideration of the curve negotiation data.