Ride Control Valve Pressure Balancing for Smooth Boom Engagement
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Solution Overview
Problem
Existing ride control systems for heavy earthmoving equipment face challenges in balancing pressures between boom cylinders and accumulators, leading to unpredictable load movements and vibrations, with current solutions either compromising operator comfort or increasing costs with complex electronics.
Innovation Solution
A ride control valve with a main spool and balance spool that gradually balances pressures between the boom cylinder unit and accumulator, allowing for a soft shift to a fully open position to maximize flow and maintain pressure equilibrium, using notches and pilot valves for controlled fluid connection management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If sophisticated electronics with controllers and pressure transducers are used to balance pressures before connecting boom cylinder and accumulator, then operator comfort and predictability are improved, but device complexity and cost increase
Solution Approach 1:
A balance spool is introduced as an intermediary mechanical element between the boom cylinder and accumulator. This balance spool automatically equalizes pressures on both sides through its spool body design, eliminating the need for complex electronic pressure sensing and control systems while ensuring safe and predictable connection during ride control mode activation.
Solution Approach 2:
The balance spool performs self-regulating pressure equalization without external control. As the main spool opens to connect the accumulator to the boom cylinder, the balance spool automatically responds to pressure differences and equalizes them, providing a self-service mechanism that prevents unpredictable load movements without requiring electronic controllers or transducers.
2Object-affected harmful factors
If the main spool opens quickly to fully connect boom cylinder and accumulator, then vibration reduction effectiveness is improved, but pressure imbalance causes unpredictable load movement
Solution Approach 1:
The balance spool performs preliminary pressure equalization action before the main spool fully opens. By pre-balancing the pressures between the boom cylinder and accumulator, the system prevents sudden unpredictable load movements when the ride control valve transitions to full opening, ensuring smooth and predictable operation while maintaining vibration reduction effectiveness.
3Reliability
If pressure balance is achieved before opening the ride control valve, then predictable operation is improved, but response time and vibration suppression are delayed
Solution Approach 1:
The balance spool operates continuously throughout the main spool opening process, maintaining pressure balance dynamically as the connection develops. This continuous action ensures predictable operation throughout the transition while allowing the main spool to open quickly for immediate vibration suppression, eliminating the need to wait for pressure balance before initiating the opening sequence.
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 provides a comfortable and vibration-reduced ride by maintaining pressure balance and allowing for maximum flow between the boom cylinder unit and accumulator, enhancing operator experience without the need for complex electronics, thus addressing the unpredictability and cost issues of existing systems.
Implementation Method 1
If the pressure in the base cylinder is higher than the accumulator pressure, the load will drop in a manner unpredictable for the operator when the ride control system is engaged. If the pressure in the hydraulic accumulator is higher than in the base end of the cylinder, the load will raise in an unpredictable manner.
Implementation Method 2
The hydraulic oil in the base end of the cylinders creates an incompressible volume.
Implementation Method 3
an accumulator connected to the boom pressure chambers of the boom cylinders via a connection line
Implementation Method 4
A ride control valve with a main spool and balance spool that gradually balances pressures between the boom cylinder unit and accumulator
Data Source
AI summary
A ride control valve includes a valve housing (30) having a main spool (32) longitudinally displaceably arranged in the valve housing, a balance spool (34), and fluid passage points for a pressure supply (P), a tank return line (T), an accumulator (14) and a boom cylinder unit (10). The balance spool (34) continuously balances the pressure between the fluid ports of the accumulator (14) and the boom cylinder unit (10). The main spool (32) is controlled by the operator and initially interconnects these fluid ports of the accumulator (14) and the boom cylinder unit (10), starting from a closed fluid connection, via a restricted fluid connection, to a fully opened fluid connection, or disconnects them from each other in reverse sequence.