Plunger Power Source for Vehicle Brake Pressure Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current vehicle braking systems face challenges in maintaining precise control, especially under adverse conditions, and in achieving optimal braking performance across all wheels, with existing systems often leading to wheel lock-up, excessive stopping distances, and loss of directional control.
Innovation Solution
A plunger assembly is introduced as a pressure source for vehicle brake systems, featuring a dual-acting mechanism that provides boosted pressure to wheel brakes, allowing for independent control of braking pressures and smooth transition between different braking modes, including anti-lock braking, traction control, and regenerative braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a driver applies excessive braking pressure under adverse conditions, then braking force increases, but wheel lock-up occurs resulting in loss of directional control and excessive stopping distances
Solution Approach 1:
The ABS system continuously monitors wheel rotational behavior and uses this feedback to selectively apply and relieve brake pressure, maintaining wheel speed within an optimal slip range to prevent wheel lock-up while maximizing braking force
Solution Approach 2:
The system dynamically adjusts brake pressure in real-time based on wheel speed feedback, transitioning between pressure application and relief modes to maintain optimal slip conditions and prevent wheel lock-up
2Reliability
If ABS valves are used to control braking pressure at each wheel, then wheel lock-up is prevented, but system complexity increases
Solution Approach 1:
The brake system is divided into independent control circuits for each wheel, with individual ABS valves controlling brake pressure at each wheel based on its specific rotational behavior, allowing precise localized control
Solution Approach 2:
The ABS valves serve multiple functions: they apply brake pressure to prevent wheel lock-up, maintain optimal slip conditions, and work in coordination with the master cylinder to provide both normal and emergency braking
3Productivity
If brake pressure is proportioned between front and rear brakes to achieve optimum slip levels, then braking performance is maximized, but control complexity increases
Solution Approach 1:
Different braking forces are applied to front and rear axles based on their specific requirements to achieve optimal slip levels at each location, with the system automatically adjusting pressure distribution according to vehicle deceleration conditions
Solution Approach 2:
The Dynamic Rear Proportioning system dynamically adjusts brake pressure distribution between front and rear wheels based on real-time wheel speed feedback and vehicle deceleration conditions, automatically optimizing braking force allocation
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
The plunger assembly enhances braking precision and stability by providing consistent and controlled pressure to all wheels, reducing the risk of wheel lock-up and improving overall braking performance, while enabling seamless transitions between different braking modes.
Implementation Method 1
The piston pressurizes a first chamber when the piston is moving in a first direction to provide fluid flow out of the first port. The piston pressurizes a second chamber when the piston is moving in a second direction opposite the first direction to provide fluid flow out of the second port.
Data Source
AI summary
A brake system includes first and second wheel brakes, a reservoir, and a brake pedal unit having a housing and a pair of output pistons slidably disposed in the housing. The output pistons generate brake actuating pressure during a manual push-through mode for actuating the first and second wheel brakes. The system further includes a plunger assembly having a housing having first and second ports, a motor driving an actuator, and a piston connected to the actuator. The piston pressurizes a first chamber when the piston is moving in a first direction to provide fluid flow out of the first port. The piston pressurizes a second chamber when the piston is moving in a second direction opposite the first direction to provide fluid flow out of the second port. The first and second ports are selectively in fluid communication with the wheel brakes.