Vehicle Suspension Control for ACC Pitch Reduction
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Solution Overview
Problem
Existing vehicle suspension systems face a compromise between isolating occupants from road vibrations and suppressing body motion during acceleration and deceleration, particularly exacerbated by automatic cruise control systems that induce undesirable pitching motions.
Innovation Solution
A control system that modifies vehicle suspension parameters in response to acceleration or deceleration demands from cruise control systems, using controllers to adjust spring rate and damping rate to counteract pitching motions proactively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the suspension system is adjusted to isolate occupants from road vibrations, then ride comfort is improved, but the ability to suppress primary body motion under acceleration and deceleration deteriorates
Solution Approach 1:
The suspension system dynamically adjusts its parameters (damper rate, spring stiffness) in real-time based on vehicle operating conditions. The control system receives acceleration demand signals from the cruise control system and modifies suspension settings accordingly, transitioning from static to dynamic adjustment to resolve the contradiction between ride comfort and body motion suppression.
Solution Approach 2:
The invention changes the physical parameters of the suspension system (damper rate, spring stiffness) based on acceleration demands. By receiving acceleration demand signals from the cruise control system and adjusting these parameters accordingly, the system optimizes performance for different operating conditions, resolving the trade-off between vibration isolation and body motion suppression.
2Adaptability or versatility
If the automatic cruise control system accelerates and decelerates the vehicle to match traffic speed, then traffic adaptability is improved, but undesirable pitch motion is generated
Solution Approach 1:
The control system applies preliminary anti-action by receiving acceleration demand signals from the cruise control system and proactively adjusting suspension parameters before the pitching motion occurs. This preemptive adjustment counteracts the harmful pitching effect before it fully manifests, allowing the ACC system to maintain traffic adaptability while reducing unwanted pitch motion.
Solution Approach 2:
The suspension control system acts as an intermediary between the cruise control system and the vehicle body. It receives acceleration demand signals from the ACC system and translates them into suspension parameter adjustments, mediating the effect of acceleration on vehicle pitch and reducing the harmful impacts on occupants.
Data Source
AI summary
A control system for a vehicle is provided, the control system comprising one or more controllers, the control system configured to receive an acceleration or deceleration demand signal from an automatic cruise control system, and request modification of one or more parameters of the vehicle suspension system in response to the received acceleration or deceleration demand signal. In this way, the vehicle suspension system may be modified in preparation for an acceleration or deceleration of the vehicle, to inhibit or at least reduce the occupants of the vehicle experiencing an undesirable pitching movement of the vehicle during the course of the change in speed of the vehicle.