Electric Hydraulic Pump Control for Low-Loss Refuse Vehicles
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Solution Overview
Problem
Refuse vehicles equipped with traditional hydraulic systems face inefficiencies due to high frictional losses from long hydraulic hoses and numerous fittings, which reduce overall performance and energy efficiency.
Innovation Solution
The implementation of a hydraulic system with multiple electric motors and pumps, strategically positioned to minimize hose length and fittings, and controlled by a processing circuit that adjusts motor speed to optimize hydraulic actuator performance based on load and route information, allowing for dynamic adjustment of cycle times and energy conservation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional hydraulic systems with long hoses and numerous fittings are used, then the hydraulic system can be简单地 implemented, but frictional losses increase and energy efficiency decreases
Solution Approach 1:
The hydraulic system is segmented into multiple independent hydraulic pumps, each positioned near specific hydraulic actuators they serve. This segmentation eliminates the need for long hydraulic hoses and numerous fittings by creating localized hydraulic circuits, thereby reducing frictional losses while maintaining system functionality.
Solution Approach 2:
The patent replaces the traditional mechanical hydraulic pump (typically engine-driven) with electrically-driven hydraulic pumps. This substitution allows for precise control of hydraulic power delivery, enabling the system to minimize energy consumption by activating only the necessary pumps at appropriate times and locations, thus reducing overall frictional losses.
2Use of energy by moving object
If multiple electric motors and pumps are strategically positioned to minimize hose length, then energy efficiency improves, but system complexity increases
Solution Approach 1:
The system dynamically controls the operation of multiple electric motors and pumps based on real-time operational requirements. The control system activates only the necessary motors and pumps for each specific task, optimizing energy efficiency while managing system complexity through intelligent coordination rather than permanent activation of all components.
Solution Approach 2:
Multiple electric motors are designed to be capable of driving different hydraulic pumps for various functions. Each motor can serve multiple hydraulic circuits depending on operational needs, reducing the total number of motors required while maintaining energy efficiency through strategic positioning and flexible assignment of functions.
3Productivity
If motor speed is dynamically adjusted to optimize hydraulic actuator performance, then productivity improves, but control system complexity increases
Solution Approach 1:
The processing circuit implements feedback control by monitoring the operational state of hydraulic actuators and adjusting motor speeds accordingly. This feedback mechanism optimizes hydraulic actuator performance for each specific task while managing control complexity through automated responses to sensor inputs, eliminating the need for complex manual control systems.
Solution Approach 2:
The system dynamically changes operational parameters, specifically motor speed, based on the specific hydraulic task being performed. By adjusting speed parameters in real-time according to load requirements and actuator position, the system optimizes productivity without requiring complex control logic, as the parameter changes are based on pre-programmed operational profiles.
4Loss of energy
If hydraulic pumps are positioned to minimize hose length, then frictional losses reduce, but installation complexity increases
Solution Approach 1:
The hydraulic system is divided into modular segments, each with its own electric motor and hydraulic pump positioned close to the actuators they serve. This modular segmentation simplifies installation by allowing each segment to be installed and tested independently, reducing the overall installation complexity despite the distributed positioning that minimizes hose length.
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 configuration reduces frictional losses, enhances energy efficiency, and extends the vehicle's operational range by optimizing hydraulic power delivery and consumption.
Implementation Method 1
an electric motor powered by a battery, a hydraulic pump driven by the electric motor
Implementation Method 2
a hydraulic pump driven by the electric motor, a hydraulic actuator powered by the hydraulic pump
Data Source
AI summary
A refuse vehicle including an electric motor powered by a battery, a hydraulic pump driven by the electric motor, a hydraulic actuator powered by the hydraulic pump, and one or more processing circuits comprising one or more memory devices coupled to one or more processors, the one or more memory devices configured to store instructions thereon that, when executed by the one or more processors, cause the one or more processors to: determine a load of the hydraulic actuator, and control a speed of the electric motor driving the hydraulic pump to achieve the load.