Hydraulic Pump Speed Control for Cold-Start Fluid Heating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electric work vehicles, such as electric backhoe loaders, face challenges in heating hydraulic fluid during low temperature operations as they lack an internal combustion engine to generate excess heat for hydraulic fluid warming, leading to viscosity issues that can cause system inefficiencies and wear.
Innovation Solution
A system and method that includes a controller monitoring hydraulic fluid temperature and adjusting the operating speed range of a pump to heat the fluid, increasing the minimum or maximum operating speed when the temperature falls below a predetermined minimum, ensuring efficient heating while minimizing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the pump operates at low speed to minimize energy consumption, then energy efficiency is improved, but the hydraulic fluid temperature drops below the minimum operating temperature causing excessive viscosity
Solution Approach 1:
The pump operating speed is dynamically adjusted based on real-time temperature feedback from the sensor. The controller continuously monitors hydraulic fluid temperature and adjusts the pump speed within its operating range to maintain temperature above the minimum threshold while minimizing energy consumption, transitioning from static to dynamic operation.
Solution Approach 2:
The system changes the operating parameters of the pump by adjusting its speed within the defined operating range. When temperature drops below the minimum, the controller increases the pump speed to generate heat through hydraulic friction and circulation, thereby changing the temperature parameter back to the acceptable range.
2Temperature
If the pump operating speed is increased to heat the hydraulic fluid, then the fluid temperature is maintained above minimum levels, but energy consumption increases
Solution Approach 1:
A temperature sensor provides real-time feedback to the controller about the hydraulic fluid temperature. The controller uses this feedback to determine when pump speed adjustment is necessary, creating a closed-loop control system that increases pump speed only when temperature drops below the minimum threshold, thereby heating the fluid while minimizing unnecessary energy consumption.
Solution Approach 2:
The hydraulic system heats itself by utilizing the pump's mechanical energy to circulate and agitate the hydraulic fluid, generating heat through internal friction and compression. This self-heating mechanism eliminates the need for external heating devices, allowing the system to maintain its own temperature using only the energy already required for pump operation.
3Temperature
If the pump operates at maximum speed to quickly heat the hydraulic fluid, then heating effectiveness is improved, but the operating cost increases due to higher energy consumption
Solution Approach 1:
Instead of operating the pump at maximum speed continuously, the system applies partial action by adjusting the pump speed only to the extent necessary to maintain minimum temperature requirements. The controller modulates the pump speed within its operating range, applying just enough energy to heat the fluid when needed, rather than consistently operating at maximum capacity.
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 solution effectively heats the hydraulic fluid, reducing viscosity and preventing system inefficiencies and wear, while optimizing energy use, thus enhancing the operational reliability of electric work vehicles in low temperature conditions.
Implementation Method 1
the controller is configured to adjust the operating speed range of the pump by increasing at least one of the minimum operating speed value or the maximum operating speed value when the monitored temperature of the hydraulic fluid falls below the predetermined minimum fluid temperature
Data Source
AI summary
An electric work vehicle includes a hydraulic actuator and a pump configured to supply hydraulic fluid to the hydraulic actuator, with the pump being operable within an operating speed range extending between a minimum operating speed value and a maximum operating speed value. Furthermore, the electric work vehicle includes a sensor configured to capture data indicative of a temperature of the hydraulic fluid and a controller communicatively coupled to the sensor. As such, the controller is configured to monitor the temperature of the hydraulic fluid relative to a predetermined minimum fluid temperature as the pump is operating within the operating speed range. In addition, the controller is configured to adjust the operating speed range of the pump by increasing at least one of the minimum operating speed value or the maximum operating speed value when the monitored temperature of the hydraulic fluid falls below the predetermined minimum fluid temperature.