Parking Brake Anti-Lock via Engine Speed Signals
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Solution Overview
Problem
Conventional parking brake systems with anti-lock devices often rely on wheel speed sensors, which can fail, leading to costly and unreliable operation, especially when sensors or their electronics malfunction.
Innovation Solution
An anti-lock device for parking brakes that determines wheel slip using engine or transmission speed signals, eliminating the need for wheel speed sensors and allowing anti-lock braking even in sensor failure scenarios, implemented as a software module within the vehicle's control system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wheel speed sensors are used for anti-lock braking in parking brake systems, then wheel locking can be detected and prevented, but the system becomes more expensive and less reliable due to sensor failures and additional cables
Solution Approach 1:
The patent extracts the wheel speed sensing function from dedicated wheel speed sensors and relocates it to the service brake control unit, which already has access to this information through the service brake system. This eliminates the need for separate sensors and cables for parking brake anti-lock functionality.
Solution Approach 2:
The service brake control unit is made multi-functional by enabling it to perform both service brake control and parking brake anti-lock detection. The same control unit processes wheel speed information for both braking systems, eliminating redundant components.
2Reliability
If wheel speed sensors are installed for parking brake anti-lock function, then wheel slip can be detected, but additional cables and sensors increase cost
Solution Approach 1:
The patent merges the anti-lock detection functionality for the parking brake with the existing service brake control system. The same control unit and sensing infrastructure serve both braking systems, eliminating redundant components and reducing manufacturing costs.
Solution Approach 2:
The service brake control unit performs dual functions: controlling the service brake and detecting wheel slip for parking brake anti-lock. This multi-functionality eliminates the need for separate sensors and reduces overall system cost.
3Reliability
If the parking brake is spring-loaded with compressed air release, then reliable parking brake engagement is achieved, but the system requires fluid-operated components increasing complexity
Solution Approach 1:
The spring-loaded brake cylinder automatically engages the parking brake through spring force when compressed air is released. The system uses the vehicle's existing compressed air supply and spring mechanism, eliminating the need for additional actuators or complex release mechanisms.
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
Enables reliable and cost-effective anti-lock braking without wheel speed sensors, ensuring the parking brake operates effectively even with faulty sensor signals, and allows optimal braking performance by venting or engaging the brake based on slip conditions.
Implementation Method 1
a storage spring engages the brake so that the vehicle is braked
Implementation Method 2
compressed air is applied to a spring-loaded part of a spring-loaded brake cylinder, so that the storage spring is compressed
Data Source
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AI summary
The invention relates to a parking brake of a brake system for a vehicle, wherein a anti-lock device (5) of the parking brake is present, which based on a signal that is dependent on a rotational speed of an engine, a transmission, or a drive shaft present in the vehicle prevents blocking or excess slippage of a wheel that can be decelerated by the parking brake. The invention further relates to a brake system of a vehicle having the parking brake and to a method for operating the brake system and to a method for operating the parking brake.