Ride control system

摘要

A ride control system and method where the system includes first hydraulics for equalizing pressure between ride control accumulators and boom cylinder head side, and second hydraulics for providing low pressure drop connection between ride control accumulators and boom cylinder head side. When ride control is engaged, the first hydraulics equalizes pressure between ride control accumulators and boom cylinder head side to within a pressure threshold, then the second hydraulics provides the low pressure drop connection between ride control accumulators and boom cylinder head side. Ride control system can include third hydraulics for providing fluid connection between boom cylinder rod side and tank; where after first hydraulics equalizes pressure to within pressure threshold, then third hydraulics provides connection between boom cylinder rod side and tank. The ride control system can also monitor the condition of the ride control accumulators.

主权项

1. A ride control system for a machine having a main hydraulic system, a ride control accumulator, a tank, and a boom cylinder, the boom cylinder having a head side and a rod side, the ride control system comprising:
a first hydraulic system for equalizing pressure between the ride control accumulator and the head side of the boom cylinder; a second hydraulic system for providing a low pressure drop connection between the ride control accumulator and the head side of the boom cylinder, the second hydraulic system comprising:
a logic valve for controlling fluid flow between the ride control accumulator and the head side of the boom cylinder, the logic valve including an external pilot and an internal pilot;a first control valve for controlling fluid flow between the ride control system and the external pilot of the logic valve;a second control valve for controlling fluid flow between the external pilot of the logic valve and the tank; wherein when the ride control system is engaged, the first hydraulic system equalizes pressure between the ride control accumulator and the head side of the boom cylinder to within a pressure difference threshold, and then the second hydraulic system provides the low pressure drop connection between the ride control accumulator and the head side of the boom cylinder; and wherein activation of the first control valve blocks fluid flow from the ride control system to the external pilot of the logic valve, activation of the second control valve vents the external pilot of the logic valve to the tank, and activation of both the first and second control valves simultaneously vents the external pilot of the logic valve to the tank and enables the logic valve to open and close through the internal pilot.