Hydraulic Control Device Pump Pressure Feedback
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Solution Overview
Problem
The existing hydraulic control devices face issues with fuel efficiency deterioration and hydraulic response delay due to excessive rotation of the second pump, leading to wasteful power consumption and hydraulic pressure decreases when switching from the second pump to the first pump.
Innovation Solution
Incorporating a hydraulic sensor to detect oil pressure at the intake and discharge sides of the second pump, with a controller that optimally controls the second pump's operation based on the detected pressure, minimizing power consumption and workload while maintaining optimal hydraulic pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the second pump is driven to pressurize oil and supply it to the hydraulic operation unit, then the fuel efficiency of the vehicle is improved by reducing the workload of the first pump, but the second pump and motor consume power wastefully when the rotation number becomes excessive with respect to the request output
Solution Approach 1:
The control unit receives detection results from the hydraulic sensor that detects oil pressure in the discharge passage, and based on this feedback information, controls the driving of the second pump. This closed-loop control prevents excessive rotation of the second pump by adjusting its operation according to actual hydraulic pressure conditions, thereby avoiding wasteful power consumption while maintaining improved fuel efficiency
Solution Approach 2:
The system changes the operating parameters of the second pump (rotation number, pressure output) based on detected hydraulic conditions and request output, optimizing the balance between reducing first pump workload and minimizing second pump power consumption
2Stress or pressure
If the rotation number of the second pump becomes excessive, then the pressure of the oil to be supplied to the hydraulic operation unit becomes excessive, but when the pump is switched from the second pump to the first pump, a hydraulic response delay occurs and hydraulic pressure may decrease
Solution Approach 1:
The control unit uses real-time pressure feedback from the hydraulic sensor to regulate the second pump's operation, preventing excessive pressure buildup. This ensures that when switching between pumps, the hydraulic pressure remains within optimal ranges, avoiding response delays and pressure drops
Solution Approach 2:
The system performs preliminary pressure regulation by controlling the second pump to maintain appropriate oil pressure before any pump switching occurs. This preparatory control prevents hydraulic response delays by ensuring pressure conditions are already optimized for the upcoming transition
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 suppresses fuel efficiency deterioration and hydraulic response delays by regularly controlling the second pump, reducing power consumption, and maintaining optimal hydraulic pressure during vehicle travel.
Implementation Method 1
a hydraulic sensor provided on at least one of an intake side of the second pump where the first oil is taken in and a discharging side of the second pump where the second oil is discharged, and configured to detect a pressure of the oil at a position where the hydraulic sensor is provided
Data Source
AI summary
In a hydraulic control device, a hydraulic sensor is provided on an intake side of a second pump where first oil is taken in and a line pressure sensor is provided on a discharging side of the second pump where the second oil is discharged. A control unit controls driving of the second pump by controlling a motor on the basis of an output pressure detected by the output pressure sensor or a line pressure detected by the line pressure sensor.