Hydraulic Pump Control Using Virtual Bleed for Actuator Accuracy
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Solution Overview
Problem
Existing hydraulic control systems fail to accurately control the operation of actuators due to variations in discharge volume of pressurized oil caused by pressure conditions and load states within the hydraulic circuit, leading to deviations in actuator performance.
Innovation Solution
A hydraulic control device and method that includes a virtual bleed information output unit, required bleed information output unit, target control value determination unit, and pump control unit to manage the hydraulic pump based on virtual and required bleed information, ensuring accurate control of the hydraulic circuit flow rate regardless of load changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the flow rate supplied to the hydraulic circuit is controlled taking into account the virtual bleed flow rate in advance, then energy conservation is improved, but the discharge volume of pressurized oil varies depending on pressure conditions and load state, causing actuator operation to deviate from commanded operation
Solution Approach 1:
The control device calculates the virtual bleed flow rate based on actual pressure conditions and load state detected during operation, then adjusts the pump discharge flow rate in real-time to compensate for variations. This feedback mechanism ensures that despite changes in pressure and load, the actuator receives the correct flow rate to perform the commanded operation accurately, while still maintaining energy efficiency by accounting for the virtual bleed flow rate in the control calculations.
2Productivity
If the discharge flow rate of the hydraulic pump is reduced to account for virtual bleed flow rate, then the flow rate supplied to the hydraulic circuit is suppressed for energy efficiency, but the actual operation of the actuator deviates from the commanded operation due to variations in discharge volume
Solution Approach 1:
The control device dynamically adjusts the pump discharge flow rate based on real-time detection of pressure conditions and load state. Rather than using a fixed reduced flow rate, the system continuously modifies the discharge flow rate to compensate for variations in virtual bleed flow rate, ensuring that the actuator receives the precise flow needed for accurate operation while maintaining overall system efficiency.
Data Source
AI summary
A hydraulic control device includes: a virtual bleed information output unit that outputs virtual bleed information indicating a state of hydraulic oil flowing through a virtual bleed circuit based on an operation amount of an operation tool, a discharge pressure of a hydraulic pump, and a preset virtual bleed characteristic that is a characteristic of the virtual bleed circuit; a required bleed information output unit that outputs required bleed information indicating the state of hydraulic oil flowing through the virtual bleed circuit that is required to cause the hydraulic actuator to perform a desired operation based on the operation amount; a target control value determination unit that determines a target control value for the hydraulic pump based on a comparison result between the virtual bleed information and the required bleed information; and a pump control unit that controls the hydraulic pump on the target control value.