Spring-Loaded Brake Cylinder Pressure Strategy for Faster Engagement
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Solution Overview
Problem
The existing electropneumatic parking brake systems with spring-loaded brakes in vehicles take too long to engage the braking effect, as they require a significant amount of air to be exhausted from the brake cylinders, which slows down the activation process.
Innovation Solution
The method involves setting the spring-loaded accumulator holding pressure to a value that is less than the reservoir pressure but above the spring-loaded accumulator release pressure, allowing for quicker engagement of the brake by reducing the mass of air to be moved when exhausting from the brake cylinders. This is achieved through a control module connected to the parking brake circuit, using a valve assembly that can regulate pressure, and can be implemented in both motor vehicles and trailers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reservoir pressure is supplied to spring-loaded brake cylinders to release the brake, then the brake release is ensured, but the time to engage braking effect is prolonged due to large mass of air to be exhausted
Solution Approach 1:
The patent changes the pressure parameter in the brake cylinders from full reservoir pressure to a reduced holding pressure (between release pressure and reservoir pressure). This parameter change reduces the pressure differential that must be overcome during brake engagement, thereby reducing the time required to exhaust the air and engage the braking effect, while still maintaining sufficient pressure to keep the brake released during normal operation.
2Loss of time
If spring-loaded accumulator holding pressure is reduced to speed up brake engagement, then brake engagement time is shortened, but the risk of unintentional brake activation increases
Solution Approach 1:
The patent introduces an intermediary pressure level (holding pressure) that serves as a mediator between the fully released state (reservoir pressure) and the activated state (release pressure). This intermediary pressure maintains the brake in a released state during normal operation but allows for faster transition to the activated state, while the control module acts as a mediator to prevent unintentional activation by monitoring and controlling pressure changes.
3Ease of operation
If full reservoir pressure is used in brake cylinders, then complete brake release is ensured, but the mass of air to be exhausted increases, slowing down brake activation
Solution Approach 1:
The patent optimizes the pressure parameter by using holding pressure instead of full reservoir pressure. This parameter change maintains sufficient brake release (ease of operation) while reducing the mass of air in the cylinders, thereby increasing brake activation speed (productivity) since less air needs to be exhausted for the spring-loaded brake to engage.
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 approach significantly shortens the time it takes for the spring-loaded brake to engage, ensuring a quicker braking effect and reducing the risk of the vehicle or trailer unintentionally moving, especially when uncoupled, by maintaining a sufficient gap from the release pressure while ensuring a higher speed of engagement.
Implementation Method 1
a spring-loaded accumulator holding pressure is applied to the spring-loaded brake cylinders in order to have them assume a position in which the spring-loaded brake is released
Implementation Method 2
When air is exhausted from the spring-loaded brake cylinders, the spring-loaded brake is active and brakes the vehicle
Data Source
AI summary
A method is for operating a parking brake system with a spring-loaded brake and a control module in a motor vehicle or trailer. The control module is connected to a parking brake circuit. The method includes supplying the parking brake circuit with reservoir pressure. The method further includes applying spring-loaded accumulator holding pressure to the spring-loaded brake cylinders in order to have the spring-loaded brake assume a release position, wherein the spring-loaded accumulator holding pressure is less than the reservoir pressure in the parking brake circuit.