Park Brake Backup Deceleration With Anti-Lock Pressure Control
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Solution Overview
Problem
Existing electro-pneumatic brake systems for automated vehicles require complex and costly redundancy solutions to ensure reliable braking, particularly in heavy-duty vehicles, where a failure of the main deceleration system necessitates an effective backup deceleration system without compromising safety or increasing system weight.
Innovation Solution
An electro-pneumatic brake system that utilizes the park brake system as a backup deceleration system, incorporating a pressure controller and stabilization device to modulate air pressure and provide wheel anti-locking functions, ensuring vehicle control and stability even when the main deceleration system fails, without modifying the service brake system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex redundant braking system is implemented for automated vehicles, then reliability of deceleration system is improved, but device complexity and cost increase
Solution Approach 1:
The park brake system, traditionally designed only for immobilization, is made multi-functional by enabling it to serve as both an immobilization system and a backup deceleration system. The pressure controller device allows the park brake chamber to perform wheel anti-locking functions during backup deceleration, making the same hardware component serve multiple purposes and providing redundancy without adding separate dedicated backup braking components
Solution Approach 2:
The park brake system serves itself by taking on additional functions. Instead of requiring a separate backup deceleration system, the existing park brake infrastructure (park brake line, park brake chamber) is utilized to provide backup deceleration capability, with the pressure controller enabling it to regulate air pressure for controlled deceleration and anti-locking operations
2Reliability
If the park brake system is modified to provide backup deceleration function, then redundancy of deceleration system is improved, but ease of manufacture deteriorates
Solution Approach 1:
The invention merges the backup deceleration function with the existing park brake system components. The pressure controller device is integrated into the park brake system architecture, combining the immobilization and backup deceleration functions into a unified system that shares common hardware infrastructure, thereby simplifying manufacturing compared to implementing entirely separate systems
3Reliability
If additional components are added to provide redundant braking, then reliability is improved, but weight of vehicle increases
Solution Approach 1:
The invention extracts the essential backup deceleration functionality from the concept of a completely separate redundant system and integrates it into the existing park brake infrastructure. By utilizing already-present components (park brake line, park brake chamber) and adding only the necessary pressure control capability, the solution achieves redundancy while minimizing additional weight compared to installing a fully independent backup braking system
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 configuration provides a simple, cost-effective redundancy solution that maintains vehicle trajectory control and stability during backup deceleration, ensuring optimal braking performance and compliance with regulations by leveraging the park brake system's ability to function in a regulated manner, thus addressing the complexity and cost issues of previous solutions.
Implementation Method 1
the park brake system comprises a pressure controller device configured to perform at least a wheel anti-locking function under a condition of the park brake system being used as a backup deceleration system, the pressure controller device being configured to control the air pressure supply in the at least one park brake line
Data Source
AI summary
An electro-pneumatic brake system for an automotive vehicle comprising brake actuators each with a service brake chamber and a park brake chamber, a service brake system forming a pneumatic main deceleration system and comprising service brake lines configured to supply air pressure to the service brake chamber of the brake actuators, a park brake system forming a pneumatic immobilization system and a backup pneumatic deceleration system, and comprising park brake lines configured to supply air pressure to the park brake chamber of the brake actuators, wherein the park brake system comprises a pressure controller device configured to perform a wheel anti-locking function under a condition of the park brake system being used as a backup deceleration system, the pressure controller device being configured to control the air pressure supply in the park brake lines.