Hydraulic Pump Speed Feedback Hold for Stable Discharge Pressure
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Solution Overview
Problem
The existing hydraulic control devices face instability in discharge pressure due to excessive increase in rotation speed of the second pump, leading to unstable hydraulic pressure and insufficient fuel consumption reduction.
Innovation Solution
A hydraulic control device with a control part that calculates the target rotation speed of the second pump by using detected oil pressures and estimated pressures, incorporating time regions for feedback amount updates and holds to prevent excessive rotation speed increases, ensuring stable discharge pressure and reduced fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback control is used to calculate the target rotation speed of the second pump, then the discharge pressure of the first pump can be maintained, but the rotation speed of the second pump may increase excessively causing instability
Solution Approach 1:
The control method dynamically adjusts the feedback gain based on the operating state of the second pump. When the rotation speed exceeds a predetermined threshold, the feedback gain is reduced to prevent excessive speed increase and instability, while allowing aggressive control when operating within safe parameters.
Solution Approach 2:
The feedback control parameters (feedback gain) are changed based on the rotation speed of the second pump. The control part switches between different feedback gain values depending on whether the rotation speed is above or below the threshold, optimizing both pressure stability and speed control.
2Use of energy by moving object
If the rotation speed of the second pump is increased to reduce fuel consumption, then the discharge pressure becomes unstable
Solution Approach 1:
The control part continuously monitors the rotation speed of the second pump and adjusts the feedback gain accordingly. This feedback mechanism ensures that when rotation speed approaches problematic levels, the control aggressiveness is reduced to maintain pressure stability while still achieving fuel efficiency goals.
Solution Approach 2:
The control system dynamically adapts its behavior based on real-time operating conditions. By adjusting feedback gain according to rotation speed thresholds, the system optimizes the balance between fuel consumption reduction and pressure stability maintenance.
Data Source
AI summary
The disclosure provides a hydraulic control device capable of suppressing an excessive increase in the rotation speed of a second pump and stabilizing the discharge pressure of the second pump. The target rotation speed of the second pump for making a pressure value of a first oil close to an estimated value of a pressure value of a third oil is calculated, and a feedback amount with respect to the target rotation speed is calculated by subtracting the estimated value of the pressure value of the third oil from the pressure value of the first oil detected by a hydraulic sensor. Time regions for performing calculation of the feedback amount include an update region in which the feedback amount with respect to the target rotation speed is updated, and a hold region in which update of the feedback amount with respect to the target rotation speed is temporarily stopped.