Brake Actuator Compressible Medium Response Time
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Solution Overview
Problem
Conventional motor vehicle braking systems face limitations in responsiveness due to the fixed volume of brake fluid, which results in diminished pre-charging effectiveness when the valve is opened, as only a portion of the pre-charged pressure is delivered to the hydraulic circuit.
Innovation Solution
Incorporating a compressible medium within the brake actuator that is subjected to brake fluid pressure, allowing it to deform and recover, thereby enhancing the responsiveness of the braking system by maintaining higher brake fluid pressure when the valve is opened.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If brake fluid is pre-charged to elevated pressure behind a closed valve, then response time is reduced, but pressure drops when valve is opened due to equalization
Solution Approach 1:
A compressible medium is introduced as an intermediary between the brake fluid and the valve. When the valve opens, the compressible medium absorbs pressure fluctuations and prevents direct equalization between the pre-charged brake fluid and the hydraulic circuit, maintaining higher brake fluid pressure while still enabling rapid response.
Solution Approach 2:
The system changes the physical state of the medium between the brake fluid and hydraulic circuit from incompressible to compressible. This parameter change allows the medium to dynamically adjust to pressure changes, absorbing pressure spikes when the valve opens and preventing the pressure drop that would otherwise occur during equalization.
2Loss of time
If brake calipers are moved closer to brake rotors, then response time is slightly reduced, but device complexity increases
Solution Approach 1:
The invention extracts the complexity of moving brake calipers closer to rotors and replaces it with a simpler solution: a compressible medium within the existing brake actuator. This maintains the response time benefit without requiring complex mechanical reconfiguration of the brake system.
3Loss of time
If pre-charging is performed with fixed volume brake fluid, then response time is reduced, but effectiveness is diminished due to pressure equalization
Solution Approach 1:
The compressible medium serves as a mediator that preserves the pre-charged pressure effectiveness. When the valve opens, the compressible medium's ability to compress and expand prevents pressure equalization, ensuring that the pre-charged pressure is effectively delivered to the hydraulic circuit rather than being lost.
Solution Approach 2:
The compressible medium is pre-positioned and pre-compressed during the pre-charging phase, storing elastic potential energy. When the valve opens, this pre-stored energy is rapidly released, maintaining pressure and ensuring the pre-charging action remains effective rather than being dissipated through equalization.
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 compressible medium ensures that brake fluid is supplied at a higher pressure earlier, reducing response time and enhancing the overall responsiveness of the braking system, while also allowing the piston actuator to use less power during pre-charging.
Implementation Method 1
A volume of the compressible medium may be configured to be changed by the force due to the pressurization of the brake fluid
Implementation Method 2
the compressible medium may be positioned relative to the chamber such that the compressible medium is subjected to a force due to pressurization of the brake fluid in the chamber
Data Source
AI summary
Brake actuators for a motor vehicle braking system, braking systems including the brake actuators, and motor vehicles including the brake actuators are provided. A brake actuator includes a chamber enclosing a volume configured to hold a quantity of brake fluid, a piston, a piston actuator, and a compressible medium. The piston actuator may be coupled to the piston and configured to actuate the piston. The compressible medium may be positioned relative to the chamber such that the compressible medium is subjected to a force due to pressurization of the brake fluid in the chamber. A volume of the compressible medium may be configured to be changed by the force due to the pressurization of the brake fluid.