Hydraulic Flow Divider Control for Travel-Load Pressure Balancing
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Solution Overview
Problem
The hydraulic circuit in existing one-pump systems restricts the degree of freedom for controlling the opening degree of the passage leading to the loading actuator due to a one-to-one relationship between supply pressure and opening degree, limiting flexibility in fluid distribution.
Innovation Solution
A hydraulic drive apparatus with a flow dividing valve that adjusts the opening degrees of passages based on travel-end supply pressure signals, allowing independent control of fluid flow to both travel motors and loading actuators through a control device that manages the flow dividing valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a priority valve is used to control the opening degree of the second pump line based on supply pressure, then the travel motor receives preferential flow when supply pressure increases, but the degree of freedom for controlling the opening degree of the second pump line is reduced due to one-to-one relationship between supply pressure and opening degree
Solution Approach 1:
The patent replaces the purely mechanical priority valve system with a hybrid system that incorporates an electronic control device and opening degree sensor. The control device receives sensor feedback about the actual opening degree and actively adjusts the second pump line opening accordingly, transitioning from passive mechanical pressure-based control to active electronic control with feedback, thereby increasing control flexibility while maintaining travel motor supply priority
Solution Approach 2:
The patent introduces a feedback mechanism where an opening degree sensor detects the actual opening degree of the second pump line and transmits this information to the control device. The control device then adjusts the opening degree based on this feedback to achieve the desired flow distribution, enabling dynamic and flexible control of the passage opening degree while ensuring travel motor priority
Data Source
AI summary
A hydraulic drive apparatus includes a hydraulic pump that discharges a working fluid; a flow dividing valve that divides a pump passage connected to the hydraulic pump into first and second passages, and changes an opening degree of each passage according to a signal that is input to the flow dividing valve; a travel system hydraulic circuit that is connected to the first passage and controls a flow of the working fluid to a travel motor; a loading system hydraulic circuit that is connected to the second passage and controls a flow of the working fluid to a loading actuator; a pressure sensor that detects a pressure supplied to the travel motor; and a control device that controls, by outputting the signal to the flow dividing valve, the opening degree of the first and second passages according to the pressure detected by the pressure sensor.