Side Inlet Solenoid Valve for Linear Pressure Control
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Solution Overview
Problem
Existing solenoid valves in brake systems face challenges in controlling linear pressure and Pulse Width Modulation (PWM) due to oil flow directions, which are not aligned with the plunger, leading to increased manufacturing costs and size, as additional channels are required in the pump housing block to redirect oil flow.
Innovation Solution
A side inlet-typed solenoid valve design that redirects oil flow from the side inlet to the front of the plunger using a passage-changing channel within the valve body, eliminating the need for additional channel formation in the pump housing block, thereby allowing for precise control of linear pressure and PWM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a channel is formed in the pump housing block to guide oil to the front of the plunger, then linear pressure control is improved, but manufacturing cost increases and device size increases
Solution Approach 1:
The invention extracts the flow direction control function from the pump housing block and relocates it to the solenoid valve body. By forming the passage-changing channel within the solenoid valve body rather than the pump housing block, the invention simplifies the overall system structure while maintaining the ability to guide oil to the front of the plunger for precise linear pressure control
Solution Approach 2:
The solenoid valve body acts as an intermediary component that performs multiple functions: it not only controls the opening and closing of the valve but also redirects the oil flow direction through its internal passage-changing channel. This intermediary structure eliminates the need for additional channels in the pump housing block, reducing manufacturing complexity while achieving the desired flow control
2Ease of operation
If the inlet and outlet of the channel are switched in the pump housing block, then oil flow direction is improved, but the entire size of the pump housing block increases
Solution Approach 1:
The invention segments the functional responsibilities between the solenoid valve body and the pump housing block. The flow direction control function is separated from the housing block and integrated into the solenoid valve body, allowing the housing block to maintain its original compact size while the solenoid valve handles the complex flow redirection internally
3Ease of manufacture
If oil flows into the solenoid valve from the side, then installation is simplified, but linear pressure control and PWM control become difficult
Solution Approach 1:
The invention introduces a dynamic flow redirection mechanism within the solenoid valve body. The passage-changing channel is designed to actively redirect oil flow from the side inlet to the front of the plunger, transforming the static side-flow configuration into an effective front-flow configuration that enables precise PWM control while maintaining the simplicity of side inlet installation
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 design enables efficient and accurate control of linear pressure and PWM, reduces the overall size and weight of the solenoid valve, and enhances the operational reliability of systems like ABS, TCS, and ESP by aligning oil flow with the plunger, thus improving the control of braking pressure.
Implementation Method 1
a coil electromagnetic field caused by a current applied
Implementation Method 2
The plunger is magnetized together with the stator and reciprocates to open/close an inside channel
Data Source
AI summary
A solenoid valve for a slip control system in a vehicle is disclosed. A flow passage is provided in which working fluid such as oil that generates a break hydraulic pressure flows from the side of a solenoid valve through a filter, flows to the front of a plunger through a side hole formed in a valve body of the solenoid valve, and then flows along the side of valve body, that is, is discharged out of an outlet through a side space between valve body and a valve seat. Therefore, linear pressure control is easy because working fluid flows into toward the front of valve plunger through a side inlet of solenoid valve and the entire size is reduced because a special channel for guiding working fluid to the front of the valve plunger is not needed in a pump housing case.