Construction Machine Hydraulic Control With Shared Solenoid Invalidation

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Solution Overview

Problem

Existing hydraulic systems in construction machines require a dedicated solenoid valve to invalidate operations on operation devices, which is inefficient and unnecessary.

Innovation Solution

A hydraulic system configuration that uses a single solenoid proportional valve to control both the validation and invalidation of operations by adjusting secondary pressure settings, eliminating the need for a dedicated solenoid valve for invalidation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a dedicated solenoid valve is added to invalidate operations on operation devices, then operational safety and control are improved, but device complexity and component quantity increase

Engineering Contradiction:

Improveoperational safetyVSAvoidcomponent quantity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The existing solenoid proportional valve is made to perform multiple functions: both controlling the validation of operations and the invalidation of operations. By adjusting the secondary pressure settings of this single valve, the system can switch between different operational states without requiring an additional dedicated solenoid valve.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The invention utilizes parameter changes in the solenoid proportional valve, specifically adjusting the secondary pressure settings, to achieve different control functions. By changing the pressure parameters, the same valve can invalidate or validate operations, eliminating the need for additional hardware components.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If a dedicated solenoid valve is added for invalidating operations, then control precision is improved, but manufacturing cost and system complexity increase

Engineering Contradiction:

Improvecontrol precisionVSAvoidmanufacturing cost

Core Design Contradiction:

Ease of operationVSEase of manufacture

Solution Approach 1:

The solenoid proportional valve is designed to handle multiple control functions through parameter adjustment. This single valve manages both operation validation and invalidation, reducing the total number of components needed and thereby lowering manufacturing costs while maintaining control precision.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

By utilizing parameter changes (secondary pressure settings) in the existing valve, the system achieves precise control over operation validation and invalidation without the need for additional components, thus reducing manufacturing complexity and cost.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If the number of solenoid valves is reduced to one, then device complexity is reduced, but the ability to independently control validation and invalidation functions may be compromised

Engineering Contradiction:

Improvevalve quantityVSAvoidfunctional independence

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The single solenoid proportional valve achieves independent control of validation and invalidation functions through parameter changes. By adjusting the secondary pressure settings, the valve can independently perform different control functions that would traditionally require separate valves.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables the validation and invalidation of operations without a dedicated solenoid valve, optimizing system efficiency and reducing component requirements.

Implementation Method 1

a solenoid proportional valve, and a switching valve interposed between an auxiliary pump and the solenoid proportional valves. The switching valve includes a pilot port connected to the secondary pressure line by a pilot line

Methodology Applied

Scientific EffectHydraulic pressure control: Pressure Gradient

Implementation Method 2

a relief valve for the main pump, the relief valve including a pilot port, the relief valve being a valve whose relief pressure increases when a pilot pressure led to the pilot port becomes higher than a first setting value

Methodology Applied

Scientific EffectPilot pressure control: Pressure Gradient

Implementation Method 3

the switching valve switching from a closed position to an open position when a pilot pressure led to the pilot port becomes higher than or equal to a second setting value that is lower than the first setting value

Methodology Applied

Scientific EffectPressure-actuated switching: Pressure Gradient

Data Source

PatentUS11655613B2Hydraulic system of construction machine

Publication Date: 2023.05.23 KAWASAKI JUKOGYO KK

AI summary

A hydraulic system of a construction machine includes: control valves interposed between a main pump and hydraulic actuators; and first solenoid proportional valves connected to pilot ports of the control valves. The hydraulic system further includes: a relief valve for the main pump, the relief valve including a pilot port; and a second solenoid proportional valve connected to the pilot port of the relief valve by a secondary pressure line and connected to an auxiliary pump by a primary pressure line. A switching valve including a pilot port connected to the secondary pressure line by a pilot line is interposed between the auxiliary pump and the first solenoid proportional valves.