Hydraulic Control Device Workload Management
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Solution Overview
Problem
The existing hydraulic control devices in vehicles face inefficiencies when switching from a mechanical pump to an electric pump, leading to reduced fuel efficiency due to excessive power generation and workload imbalance, causing unnecessary strain on the electric pump and potentially deteriorating fuel efficiency.
Innovation Solution
Incorporating a workload calculation unit, a workload determination unit, and a motor controller to assess and manage the workload balance between the mechanical and electric pumps, stopping or reducing the electric pump's operation when excessive power generation occurs to prevent fuel efficiency deterioration, thereby optimizing oil supply without wasteful operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the second pump is driven to pressurize the first oil and supply it to the hydraulic operation unit, then the workload of the first pump is reduced, but the fuel efficiency may deteriorate due to excessive power generation from the power generator
Solution Approach 1:
The control unit calculates the amount of workload cut in the first pump and the amount of workload loss from the power generator, then uses this feedback information to determine whether to drive the second pump. This feedback mechanism ensures that the second pump is only operated when the workload cut exceeds the workload loss, thereby improving fuel efficiency while reducing the first pump's workload.
Solution Approach 2:
The system changes the operational parameters (rotation number, on/off state) of the second pump based on calculated workload values. By dynamically adjusting these parameters according to the balance between workload cut and workload loss, the system optimizes fuel efficiency while achieving the desired workload reduction in the first pump.
2Use of energy by moving object
If the second pump is operated to improve fuel efficiency by reducing the first pump's workload, then fuel efficiency may be improved, but the pump durability may deteriorate due to unnecessary operation
Solution Approach 1:
The control unit continuously monitors and calculates workload values to provide feedback on whether operating the second pump will actually improve fuel efficiency. This feedback prevents unnecessary operation of the second pump, thereby protecting pump durability while still achieving fuel efficiency improvements when beneficial.
Solution Approach 2:
The system uses the calculated workload information to automatically determine the optimal operation state of the second pump without external intervention. This self-service mechanism ensures the pump operates only when it serves a useful purpose, preventing wear from unnecessary operation while maintaining fuel efficiency.
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 ensures efficient oil supply to the hydraulic operation unit without compromising fuel efficiency, reducing abrasion and maintaining pump durability by only operating the electric pump when fuel efficiency is improved.
Implementation Method 1
a check valve connected in parallel and configured to supply first oil from the first pump to the hydraulic operation unit through the check valve
Implementation Method 2
pressurize the first oil that is supplied from the first pump with the second pump and supply the first oil that has been pressurized to the hydraulic operation unit as second oil
Data Source
AI summary
In a control unit of a hydraulic control device, a workload calculation unit calculates the amount of workload cut in a first pump when supply of first oil from the first pump to a continuously variable transmission mechanism through a check valve is switched to supply of second oil from a second pump to the continuously variable transmission mechanism. A workload determination unit determines whether the amount of workload loss of an ACG is more than the amount of workload cut. A motor controller stops a motor or decreases a rotation number if the workload determination unit determines that the amount of workload loss is more than the amount of workload cut.