Dual Hydraulic Pump Crossover Control for Selectable Flow Modes
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Solution Overview
Problem
Current multiple pump hydraulic systems for vehicles are limited in their ability to switch between combined and separate flow modes efficiently, leading to reduced operational efficiency as operators often cannot select the desired operational mode on the fly, resulting in suboptimal performance for varying applications.
Innovation Solution
The hydraulic system incorporates a crossover pressure controller and crossover load sense controller that can be reconfigured independently of the load sense systems, allowing for user-selectable combined or separate flow modes, enabling the system to automatically adjust to meet the demands of different applications by providing fluid communication or isolation between pressure ports and load sense ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multiple pump hydraulic system is designed to switch between combined and separate flow modes, then the adaptability for different applications is improved, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The hydraulic system employs dynamic reconfiguration of fluid communication pathways through a crossover pressure controller that can switch between connected and isolated states. This allows the system to transition between combined flow mode (both pumps working together) and separate flow mode (pumps working independently) based on operational demands, thereby achieving adaptability without permanently increasing structural complexity
Solution Approach 2:
A crossover pressure controller serves as an intermediary component between the first and second hydraulic pumps. This controller manages the fluid communication pathways, enabling selective connection or isolation of the pumps' pressure ports and load sense ports. The intermediary controller simplifies the overall system architecture by centralizing the switching logic in a single component rather than requiring multiple complex control mechanisms
2Ease of operation
If the crossover pressure controller is actuatable independent of the load sense systems, then the ease of operation is improved allowing on-the-fly mode selection, but the device complexity increases
Solution Approach 1:
The crossover pressure controller is designed with multi-functionality, serving both as a pressure management device and as an operational mode selector. By integrating the mode selection capability into the existing pressure controller structure, the system achieves ease of operation without adding separate control mechanisms. The controller can be actuated independently through various means (manual valve, electronic control) while maintaining its primary pressure regulation function
Solution Approach 2:
The system enables operators to self-select operational modes based on real-time requirements. The independent actuation of the crossover pressure controller allows users to switch between combined and separate flow modes without requiring complex control sequences or external system coordination. This self-service capability simplifies operation while the modular design prevents excessive complexity increase
Data Source
AI summary
A hydraulic system for a vehicle includes a first hydraulic pump including a first displacement actuator and a first pressure port, a first load sense system fluidly coupled to the first displacement actuator, a second hydraulic pump including a second displacement actuator and a second pressure port, a second load sense system fluidly coupled to the second displacement actuator, and a crossover pressure controller coupled between the first pressure port and the second pressure port. The crossover pressure controller reconfigurable between (a) a combined pressure configuration providing fluid communication between the first pressure port and the second pressure port and (b) a separate pressure configuration inhibiting fluid communication between the first pressure port and the second pressure port. The crossover pressure controller is actuatable independent of the first load sense system and the second load sense system.