Braking Hydraulic Circuit for Linear Pressure Gradient Control
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Solution Overview
Problem
Existing braking hydraulic systems face limitations in controlling pressure gradients between front and rear wheels during ABS and TCS operations, leading to instability and requiring costly development of PWM-type solenoid valves.
Innovation Solution
A braking hydraulic circuit utilizing normal open and normal close solenoid valves to form a two-system liquid pressure flow, with an accumulator for temporarily storing discharged pressure, allowing for unified pressure control without the need for separate PWM-type solenoid valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If PWM-type solenoid valves are used for precise pressure control, then pressure gradient control is improved, but device complexity and cost increase
Solution Approach 1:
The braking system is divided into two independent hydraulic circuits (first and second braking hydraulic circuits), each with its own solenoid valve. This segmentation allows each circuit to be controlled independently, enabling precise pressure gradient control without requiring complex PWM-type valves, thus resolving the contradiction between control precision and device complexity.
Solution Approach 2:
The patent combines two simple on/off type solenoid valves into a coordinated system that works together to achieve pressure gradient control. By merging the functionality of multiple simple valves rather than using a single complex PWM valve, the system achieves precise control while maintaining simplicity and reducing cost.
2Device complexity
If on/off type solenoid valves are used for braking control, then device complexity is reduced, but pressure gradient control capability deteriorates
Solution Approach 1:
The system segments the braking control into two separate hydraulic circuits, each controlled by a simple on/off solenoid valve. This segmentation transforms the limitation of on/off control into an advantage by allowing independent control of front and rear wheel braking pressures, thereby achieving pressure gradient control without complex valves.
Solution Approach 2:
The patent introduces a controller as an intermediary that coordinates the operation of two simple solenoid valves to achieve complex pressure gradient control. The controller acts as a mediator that translates simple on/off valve actions into precise pressure gradient control, resolving the contradiction between valve simplicity and control capability.
3Speed
If front and rear wheel braking pressure are generated simultaneously, then response time is reduced, but braking stability deteriorates due to pressure gradient difference
Solution Approach 1:
The braking system is segmented into two independent hydraulic circuits that can operate at different rates. The first circuit (front wheels) and second circuit (rear wheels) are controlled separately, allowing the front wheels to generate braking pressure faster than the rear wheels, thus maintaining braking stability while preserving rapid response capability.
Solution Approach 2:
The system dynamically adjusts the pressure generation rate for front and rear wheels based on real-time braking conditions. By making the pressure generation speed dynamic rather than uniform, the system achieves both rapid response and braking stability, resolving the contradiction between speed and stability.
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 enables precise pressure reduction control during ABS and TCS operations, eliminating pressure gradient differences between front and rear wheels, thus stabilizing braking performance without the need for costly PWM-type solenoid valve development.
Implementation Method 1
providing an accumulator for temporarily storing a discharged liquid pressure
Implementation Method 2
providing various solenoid valves on a hydraulic circuit formed between a wheel cylinder for holding and restricting a disk wheel and a master cylinder for generating a hydraulic pressure
Data Source
AI summary
The present invention relates to a braking hydraulic circuit for linear pressure reduction of a front/rear wheel braking liquid pressure in a vehicle. On a liquid pressure return line formed between wheel cylinders and a master cylinder, a two-system liquid pressure control circuit separately passes liquid pressures to be discharged from the wheel cylinders and then unifies the liquid pressures. The liquid pressure control circuit has normal open type solenoid valves and normal close type solenoid valves. Therefore, at the time of implementation of ABS (Antilock Brake System) or TCS (Traction Control System), linear control of a front/rear wheel braking liquid pressure can be realized. In addition, a difference in pressure intensification gradient according to a difference in generation time between the front and rear wheels can be eliminated.