Vehicle Controller Vibration Damping via Demand Force Segmentation
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Solution Overview
Problem
Existing vehicle control systems face complexity and reduced robustness in vibration damping control due to the need to design cruise control systems in conjunction with vibration damping processing, which complicates system construction and requires excessive robustness to achieve desirable vibration damping effects across varying vehicle operating states.
Innovation Solution
A controller system that includes a first demand force arithmetic unit, a second demand force arithmetic unit, a vibration damping filter, and an arbitration unit to calculate and compare demand forces, selectively filtering out vibration-inducing factors from the driver demand force to produce a post-filter demand force, thereby simplifying the system while maintaining robustness and securing effective vibration damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If vibration damping processing is performed with respect to the demand force after arbitration, then vibration damping effect is achieved, but the system construction becomes complicated and robustness is reduced
Solution Approach 1:
The patent segments the demand force calculation into two independent parallel paths: one path calculates the first demand force including vibration-inducing factors, while the other path calculates the second demand force excluding such factors. This segmentation allows vibration damping to be applied selectively to only the first demand force path, avoiding the need to complicate the entire control system while still achieving effective vibration damping where needed.
2Reliability
If vibration damping processing is applied to achieve desirable vibration damping effects in all control ranges, then robust vibration damping is achieved, but excessive robustness is required and system complexity increases
Solution Approach 1:
The patent divides the control system into segmented demand force calculation paths, allowing robust vibration damping to be implemented only where necessary (in the first demand force path) rather than throughout the entire system. This targeted approach achieves reliable vibration damping in all control ranges without requiring excessive robustness measures across the whole system, thereby reducing overall complexity.
Solution Approach 2:
The patent applies different processing qualities to different parts of the demand force calculation: the first demand force undergoes vibration damping processing while the second demand force does not. This local differentiation allows robust vibration damping to be achieved precisely where vibration-inducing factors are present, without unnecessarily complicating other parts of the system that do not require such processing.
3Object-affected harmful factors
If the cruise control system is designed in conformity with vibration damping processing, then effective vibration damping control is achieved, but system construction becomes complicated
Solution Approach 1:
The patent segments the control architecture so that vibration damping processing is applied only to the first demand force calculation path, which handles acceleration and deceleration control. The cruise control operates independently in the second demand force path without needing to conform to vibration damping processing. This segmentation allows effective vibration damping control where needed while keeping cruise control system construction simple and independent.
Data Source
AI summary
A controller controls braking force and driving force of a vehicle, in accordance with demand force. The controller includes a first and second demand force arithmetic units for arithmetically calculating first and second demand force. The first demand force includes a factor inducing vibration in suspended components of the vehicle. The second demand force substantially excludes the factor inducing vibration in suspended components of the vehicle. A vibration damping filter reduces the factor from a waveform of the first demand force, thereby producing post-filter demand force. An arbitration unit compares the post-filter demand force with the second demand force, thereby selecting one of the post-filter demand force and second demand force as final demand force.