Linear Compressor Stroke Control in Vehicle Air Suspension
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Solution Overview
Problem
Existing air suspension systems face challenges in controlling piston stroke to follow load changes, leading to potential collisions and reduced discharge flow rates when load conditions suddenly change, affecting the reliability and efficiency of vehicle height adjustment.
Innovation Solution
Incorporating a solenoid valve and inverter to control the power supplied to the linear motor, allowing for real-time adjustment of piston position and stroke based on load conditions, preventing collisions and optimizing dead volume and discharge flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the piston stroke is controlled by linear motor drive control alone, then the system structure remains simple, but the piston position cannot follow load changes causing collisions or reduced discharge flow rate
Solution Approach 1:
The control system incorporates feedback mechanisms where the linear motor controller receives information about load changes and solenoid valve states, automatically adjusting piston stroke to prevent collisions and optimize discharge flow rate. This closed-loop control ensures the piston position follows load changes without requiring complex manual intervention.
Solution Approach 2:
The system dynamically adjusts the piston stroke length based on real-time load conditions. When load changes are detected, the linear motor controller modifies the stroke to maintain optimal operation, preventing both collisions (when load decreases) and flow rate reduction (when load increases).
2Productivity
If the piston stroke is increased to maintain discharge flow rate during load increase, then the discharge flow rate is maintained, but the system cannot respond quickly enough to sudden load changes
Solution Approach 1:
The system performs preliminary adjustments by detecting load changes early through solenoid valve state monitoring and linear motor controller feedback. Before the piston reaches problematic positions, the controller pre-adjusts the stroke length to maintain discharge flow rate and prevent collisions, enabling faster response than waiting for mechanical conditions to deteriorate.
3Productivity
If the system uses fixed piston stroke control, then the control system is simple, but the dead volume cannot be optimized leading to reduced discharge flow rate during load increase
Solution Approach 1:
The system changes the piston stroke parameter dynamically based on load conditions. During load increase, the linear motor controller extends the piston stroke to reduce dead volume and maximize discharge flow rate. During load decrease, it reduces the stroke to prevent collisions. This parameter adjustment is automated through the control system integrating solenoid valve feedback and linear motor control.
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
This solution enhances the reliability and efficiency of air suspension systems by preventing piston-cylinder collisions and increasing discharge flow rates, enabling responsive and efficient vehicle height adjustments suitable for various driving modes.
Implementation Method 1
a linear motor that reciprocates the piston
Implementation Method 2
an inverter that changes power supplied to the linear motor according to an open and closed state of the solenoid valve to perform position control of the piston
Implementation Method 3
a solenoid valve that opens and closes the air suspension or the tank
Implementation Method 4
a compressor body in which a piston reciprocates in a cylinder to compress air
Data Source
AI summary
A highly reliable and highly efficient air suspension system for a vehicle is provided by improving the trackability of stroke control with respect to pressure fluctuations applied to a linear compressor, suppressing stroke increase due to pressure drop, preventing piston collision, and increasing a flow rate by reducing dead volume. To realize this, the air suspension system includes an air suspension that supplies and discharges compressed air to adjust a length, a compressor body in which a piston reciprocates in a cylinder to compress air, a linear motor that reciprocates the piston, a tank that is connected to the air suspension or the compressor body and stores compressed air, a solenoid valve that opens and closes the air suspension or the tank, and an inverter that changes power supplied to the linear motor according to an open and closed state of the solenoid valve to perform position control of the piston.