Shock Absorber End-Stop Damping Using Position-Based Valve Control
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Solution Overview
Problem
Shock absorbers in vehicle suspension systems often contact end stops due to road irregularities, leading to discomfort, noise, and potential damage, as existing control systems fail to effectively prevent such contact.
Innovation Solution
A damping control system with a valve control module that regulates hydraulic fluid flow by selectively closing valves when the piston approaches end stops, increasing the damping coefficient to prevent contact, using a position sensor to determine valve commands based on the piston's position, vehicle speed, and suspension mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the damping coefficient is increased to prevent piston contact with end stops, then reliability is improved, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The control system performs preliminary action by detecting piston position in advance and adjusting the damping coefficient before the piston reaches the end stop. This proactive approach prevents harmful contact by preparing the damping force ahead of time, rather than reacting after contact occurs.
Solution Approach 2:
The system employs feedback by continuously monitoring the piston position through position sensors and using this information to dynamically adjust the damping coefficient. The control unit receives position feedback and modifies valve operation accordingly, creating a closed-loop control system that adapts to real-time conditions.
2Object-affected harmful factors
If valves are closed selectively based on piston position to prevent end stop contact, then harmful factors are reduced, but ease of operation deteriorates due to complex valve control requirements
Solution Approach 1:
The damping control system performs self-service by automatically adjusting the damping coefficient based on piston position feedback without requiring manual intervention. The control unit autonomously determines when to close valves based on position thresholds, eliminating the need for operator judgment or manual valve adjustment.
Solution Approach 2:
The system replaces manual mechanical valve operation with an automated electromechanical control system. The control unit uses electrical signals to actuate valves based on sensor input, substituting complex manual mechanical adjustment with automated electro-hydraulic control that responds dynamically to piston position.
3Object-affected harmful factors
If the damping coefficient is dynamically adjusted based on real-time conditions, then ride comfort is improved, but use of energy increases due to continuous monitoring and control
Solution Approach 1:
The system applies dynamics by continuously adapting the damping coefficient to changing operating conditions. Rather than using a fixed damping setting, the control unit dynamically adjusts valve operation based on real-time piston position feedback, allowing the damper to optimize performance across varying road conditions and vehicle states.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents piston contact with end stops, reducing discomfort and potential damage by dynamically adjusting the damping coefficient based on real-time vehicle conditions, thereby enhancing ride comfort and system durability.
Implementation Method 1
A valve control module is provided which may be configured to selectively close the first valve when a position of the plunger is between a first reference position within the first chamber and a first end stop of the damping chamber
Data Source
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AI summary
A damping control system includes: a damping chamber connected to one of (a) a body of a vehicle and (b) a wheel of the vehicle; a piston that is slidably disposed within the damping chamber and that includes: a piston rod that is connected to the other one of (a) the body of the vehicle and (b) the wheel of the vehicle; and a plunger that is connected to the piston rod and that divides the damping chamber into a first chamber and a second chamber; a first valve that regulates hydraulic fluid flow out of the first chamber; and a valve control module configured to selectively close the first valve when a position of the plunger is between (a) a first reference position within the first chamber and (b) a first end stop of the damping chamber that defines a boundary of the first chamber.