Vehicle Dynamics Control Fault Detection Under Constant Hydraulic Volume
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Solution Overview
Problem
Current vehicle brake systems face challenges in ensuring a minimum deceleration of 2.44 m/s² at 500 Newton pedal force with a single point of failure while maintaining a compact hydraulic configuration, as different vehicle types require varying brake caliper operations, making it difficult to use a single brake system configuration without extending the master cylinder length or pedal travel.
Innovation Solution
A method and system for fault detection in a vehicle dynamics control that hydraulically couples a power brake to a vehicle dynamics control, using a decoupled power brake (DPB) to generate brake pressure independently of the brake pedal, ensuring the vehicle dynamics control can provide emergency functions even in case of power brake failure, by maintaining a constant hydraulic volume and detecting latent faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the master cylinder is configured to provide appropriate hydraulic pressure without additional boosting, then the brake system can ensure minimum deceleration with a single point of failure, but the master cylinder length and/or pedal travel must be significantly extended
Solution Approach 1:
The patent introduces a brake pressure accumulator as an intermediary component between the driver's pedal input and the brake calipers. This accumulator stores hydraulic pressure and releases it as needed, eliminating the need for an extended master cylinder while maintaining the required deceleration performance and reliability with single point of failure protection.
Solution Approach 2:
The brake pressure accumulator pre-charges the hydraulic system with stored pressure before braking is required. This preliminary action allows the system to deliver immediate high-pressure brake fluid to the calipers without requiring a long master cylinder stroke, thus maintaining compact dimensions while ensuring reliable minimum deceleration.
2Adaptability or versatility
If the master cylinder is extended to accommodate different vehicle types and brake calipers, then all vehicle types can be operated with one brake system configuration, but the master cylinder length and/or pedal travel are significantly extended
Solution Approach 1:
The brake pressure accumulator serves multiple functions: it compensates for different brake caliper volume requirements across various vehicle types, maintains system pressure, and enables a single compact master cylinder design to universally fit different brake systems without extension.
Solution Approach 2:
The system uses a dynamic brake pressure accumulator that can adapt its pressure output based on the specific requirements of different vehicle types and brake calipers, allowing one compact master cylinder configuration to serve multiple applications without physical extension.
3Reliability
If the vehicle dynamics control generates brake pressure independently of the brake pedal, then emergency functions are available even in case of power brake failure, but the system complexity increases
Solution Approach 1:
The patent combines the emergency brake pressure generation function with the existing brake pressure accumulator and vehicle dynamics control system. By merging these functions into a unified hydraulic architecture, the system achieves independent emergency brake capability without proportionally increasing overall system complexity.
Solution Approach 2:
The brake pressure accumulator is designed to automatically generate and maintain emergency brake pressure independently of the brake pedal or power brake system. This self-service capability ensures emergency functions remain available even when other system components fail, without requiring complex additional control 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
This approach enhances the flexibility and reliability of brake system configurations, allowing for broader vehicle compatibility and ensuring emergency functions are available, thus minimizing the risk of failure and expanding design guidelines for brake systems.
Implementation Method 1
a first control signal is provided to the vehicle dynamics control in order to provide a first hydraulic pressure by means of the vehicle dynamics control
Implementation Method 2
a second hydraulic pressure at the hydraulic coupling is controlled by means of the power brake in such a way that a hydraulic volume in the system remains constant
Data Source
AI summary
A method for fault detection in a vehicle dynamics control, in a system which includes a power brake and a vehicle dynamics control and is configured to couple the power brake hydraulically to the vehicle dynamics control. The method includes: generating a first control signal and providing the first control signal to the vehicle dynamics control to provide a first hydraulic pressure using the vehicle dynamics control; generating the first hydraulic pressure by means of the vehicle dynamics control, wherein a second hydraulic pressure at the hydraulic coupling is controlled using the power brake in such a way that a hydraulic volume in the system remains constant; wherein, after the process of generating the first hydraulic pressure has ended, a third hydraulic pressure of the vehicle dynamics control is determined at the hydraulic coupling to detect a fault in the vehicle dynamics control.