Electric Hydraulic Power Layout for Lower Starting Current
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Solution Overview
Problem
Conventional electric driven hydraulic systems for heavy equipment face inefficiencies in energy use and hydraulic oil supply, leading to excessive power consumption and waste, as they require large-capacity motors and batteries to operate multiple actuators simultaneously.
Innovation Solution
An electric driven hydraulic power system with multiple small motors, hydraulic pumps, and a main control valve, where a control unit optimizes the supply of hydraulic oil by selectively activating motors and pumps based on actuator requirements, using a battery management system to minimize waste and maximize efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large-capacity motor and hydraulic pump are used to supply sufficient hydraulic oil to multiple actuators simultaneously, then the hydraulic system can operate all actuators, but the starting current consumption increases and battery discharge occurs easily
Solution Approach 1:
The patent divides the single large-capacity motor into multiple small-capacity motors (first motor, second motor, third motor). Each motor is paired with a corresponding hydraulic pump to supply hydraulic oil to specific actuators. This segmentation allows the system to activate only the necessary motors based on current operational needs, significantly reducing starting current consumption while maintaining the capability to operate all actuators when required.
2Quantity of substance
If a large-capacity motor is used to supply hydraulic oil to multiple actuators, then sufficient hydraulic oil can be supplied, but hydraulic oil waste increases due to simultaneous operation of all actuators
Solution Approach 1:
The patent implements dynamic control where the control unit selectively activates specific motors and hydraulic pumps based on the current operational requirements of actuators. This dynamic activation strategy ensures that hydraulic oil is supplied only to the actuators that need to operate at any given moment, preventing hydraulic oil waste while maintaining sufficient supply capability for all actuators when needed.
3Power
If the motor capacity is increased to handle peak loads of multiple actuators, then all actuators can operate simultaneously, but the battery capacity requirements increase and operating time decreases
Solution Approach 1:
The patent applies partial action by activating only the necessary subset of motors and hydraulic pumps required for current operational demands, rather than running all motors at full capacity continuously. The control unit monitors actuator requirements and activates motors on-demand, significantly reducing overall power consumption and extending battery operating time while maintaining the ability to handle peak loads when all actuators operate simultaneously.
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
This approach reduces starting current consumption, minimizes hydraulic oil waste, and enhances operational efficiency by dynamically adjusting motor speeds and pump operations, allowing for efficient use of electrical energy and extending battery usage.
Implementation Method 1
first to nth inverters connected to the motors to convert a direct current of a battery into alternating currents for the motors
Implementation Method 2
first to nth hydraulic pumps, which are a plurality of hydraulic pumps directly connected to shafts of the motors to supply the hydraulic oil introduced from a storage tank to a main control valve (MCV)
Implementation Method 3
the main control valve (MCV) including a plurality of valves provided to control opening/closing of a flow path so as to receive the hydraulic oil supplied from the first to nth hydraulic pumps and selectively supply the hydraulic oil or block the supply of the hydraulic oil to the first to kth hydraulic actuators
Data Source
AI summary
The present invention relates to an electric driven hydraulic power system for heavy equipment, and more particularly, to a hydraulic power system, which includes a hydraulic pump operated by a battery and a motor, a supply line for supplying a hydraulic oil that is supplied by the hydraulic pump, a plurality of actuators, and a controller for controlling the motor and the actuators, in which electrical efficiency is significantly improved. In particular, the present invention relates to an electric driven hydraulic power system in which a plurality of motors and a plurality of hydraulic pumps corresponding to the motors, respectively, are provided, and a main control valve (MCV) for receiving a hydraulic oil from the hydraulic pumps to supply the hydraulic oil to a plurality of actuators is provided, so that efficient control is performed according to an operating load, an operating temperature, a supply flow rate, and the like to minimize power consumption of the motor, and thus electrical efficiency is improved to dramatically increase an operating time.