Variable Capacity Pump Spool Control via Solenoid
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Solution Overview
Problem
Conventional variable capacity pumps face challenges in ease of control, which affects their operational efficiency and adaptability.
Innovation Solution
A variable capacity pump design incorporating a spool capable of controlling working oil introduction into a control chamber and a solenoid that adjusts electromagnetic force to bias the spool, allowing for improved control and adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional variable capacity pumps are used, then the structure is relatively simple, but the ease of control is insufficient
Solution Approach 1:
The patent replaces conventional mechanical control mechanisms with an electromagnetic control system. A solenoid generates an electromagnetic force that directly biases the spool, eliminating the need for complex mechanical linkages, springs, or cam mechanisms. The electromagnetic force can be precisely controlled through electrical signals, enabling easy adjustment of pump capacity without increasing mechanical complexity
Solution Approach 2:
The patent uses hydraulic pressure from the working oil to assist in controlling the spool position. The spool controls the introduction of working oil into a control chamber, and the hydraulic force generated by this oil works in conjunction with the electromagnetic force to bias the spool. This hydraulic assistance simplifies the control mechanism while improving ease of control, as the system leverages the existing hydraulic pressure rather than requiring additional mechanical actuators
2Adaptability or versatility
If pump capacity is fixed, then the device complexity is low, but the adaptability to changing engine conditions is poor
Solution Approach 1:
The patent implements a dynamic capacity adjustment mechanism where the pump capacity can be continuously varied in response to changing engine conditions. The solenoid's electromagnetic force can be dynamically adjusted through electrical control signals, allowing the spool position to change and thereby varying the pump capacity. This dynamic control enables the pump to adapt to different operating conditions without requiring multiple fixed-capacity pumps or complex mechanical adjustment mechanisms
Solution Approach 2:
The patent changes the operational parameters of the pump by varying the electromagnetic force applied to the spool. By adjusting the electrical current to the solenoid, the electromagnetic force changes, which in turn changes the spool position and the pump capacity. This parameter-based control allows for smooth, continuous adjustment of pump performance to match varying engine conditions without increasing mechanical complexity
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
Enhances the ease of control and operational efficiency by allowing precise adjustment of pump capacity in response to changing engine conditions, optimizing hydraulic pressure and flow rate.
Implementation Method 1
a solenoid which is capable of changing the magnitude of an electromagnetic force which biases the spool
Data Source
AI summary
Provided is a variable capacity pump where ease of control can be improved. A variable capacity pump includes a control chamber and a control mechanism. The control chamber is disposed between a pump accommodating chamber and a movable member, and the volume of the control chamber is variable with the movement of the movable member. Working oil discharged from a discharge portion is introduced into the control chamber. The control mechanism includes a spool, a biasing member, and a solenoid. The spool is provided in a passage, and is configured to control introduction of working oil into the control chamber by moving in a cylindrical portion. The spool is biased to one side in an axial direction by a pressure of working oil introduced into the cylindrical portion from the discharge portion. The biasing member biases the spool to an opposite side in the axial direction. The solenoid is configured to generate an electromagnetic force for biasing the spool in the axial direction, and to change a magnitude of the electromagnetic force according to a value of an electric current supplied.