Braking Force Verification via Hydraulic Volume Comparison
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for checking braking force in vehicles, which combine hydraulic and electromechanical braking systems, often fail to ensure a desired braking level, particularly when both systems are actuated simultaneously, leading to potential safety issues during parking or low-speed maneuvers.
Innovation Solution
A method that compares the hydraulic braking medium volume displaced by the electric brake motor to a hydraulic reference volume, determined by a pressure-volume correlation, to identify deviations from the desired braking force, generating an error signal if the volumes differ significantly, allowing for corrective measures to be taken.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both the vehicle hydraulic brake and the electromechanical braking device are actuated to generate braking force, then the desired braking level can be achieved, but the total braking force may still fall below the required level due to insufficient individual contributions
Solution Approach 1:
The patent implements a feedback mechanism by comparing the actual braking force (inferred from hydraulic braking medium volume displacement) with the desired braking force. When the electromechanical braking device adjusts the brake piston, the system measures the corresponding hydraulic braking medium volume change and compares it to a reference volume to verify whether the combined braking force meets the required level, generating an error signal if verification fails.
Solution Approach 2:
The patent replaces direct mechanical measurement of braking force with a hydraulic volume measurement approach. Instead of mechanically measuring the combined braking force from both brake systems, the system substitutes this with measurement of the hydraulic braking medium volume displaced by the brake piston, which correlates to the braking force applied.
2Force
If the electromechanical braking device adjusts the brake piston mechanically, then braking force is generated, but the hydraulic pressure may drop due to volume change in the hydraulic system
Solution Approach 1:
The system uses feedback control by monitoring the hydraulic braking medium volume displacement when the electromechanical braking device adjusts the brake piston. The measured volume is compared to a reference volume derived from pressure-volume correlation, and the system can detect pressure drops or volume deviations, generating error signals to indicate when hydraulic pressure has fallen outside the expected range.
3Measurement precision
If the hydraulic braking medium volume is used to verify braking force, then the braking force can be checked, but the system complexity increases due to additional measurement and comparison requirements
Solution Approach 1:
The patent introduces the hydraulic braking medium volume as an intermediary measurement parameter. Instead of directly measuring the complex combined braking force from both brake systems, the system uses the hydraulic fluid volume displacement as an intermediary that correlates to the braking force applied by the brake piston, simplifying the verification process while maintaining measurement precision.
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 method effectively identifies and addresses instances where the combined braking force falls below the required level, enabling immediate corrective actions such as displaying error signals to the driver or adjusting the braking systems to achieve the necessary braking force, thus ensuring vehicle safety during parking and low-speed operations.
Implementation Method 1
a specific hydraulic pressure is generated in the vehicle hydraulic brake by way of the braking force booster, said hydraulic pressure acting upon the brake piston
Implementation Method 2
the brake motor of the electric braking device additionally influences the brake piston and adjusts said brake piston mechanically in the direction of the brake disc
Implementation Method 3
a change in volume in the hydraulic braking system accompanies the adjusting movement of the brake piston and this change of volume must be compensated for by means of an inflow of brake fluid
Data Source
AI summary
A method for checking the braking force in a vehicle includes adjusting a brake piston with a vehicle hydraulic brake that has a braking force booster and with an electromechanical braking device that has a brake motor so as to generate a braking force. The hydraulic braking medium volume that corresponds to the displacement of the brake piston via the brake motor is compared to a hydraulic reference volume.