Brake Transfer Control for Noise Reduction
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Solution Overview
Problem
Vehicles equipped with hydraulic service brakes and electric parking brakes often experience brake lining loosening and noise issues when transferring from hydraulic holding to electric parking brake mode, leading to discomfort and reduced safety during extended stationary periods.
Innovation Solution
A method where both the service brake and parking brake are actuated simultaneously during the transfer, with the service brake undergoing additional autonomous pressure build-up to maintain constant braking force and prevent vehicle movement or noise, using a control unit to manage the actuation based on predetermined profiles and sensor data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle is transferred from hydraulic holding function to electric parking brake, then the parking brake can maintain the vehicle stationary, but the brake linings slowly loosen and the brake disc slips causing annoying noise
Solution Approach 1:
The invention applies preliminary action by performing an additional autonomous pressure build-up in the service brake at the beginning of the transfer process. This preliminary pressure increase compensates for the pressure drop that would otherwise occur when the parking brake is applied, preventing the brake linings from loosening and the brake disc from slipping, thereby avoiding noise generation while ensuring reliable vehicle holding.
2Adaptability or versatility
If the service brake pressure is reduced during transfer to parking brake, then the parking brake can take over holding function, but the brake linings loosen and vehicle may move
Solution Approach 1:
The invention applies preliminary anti-action by implementing an additional autonomous pressure build-up in the service brake that counteracts the pressure reduction occurring during the transfer to the parking brake. This compensatory pressure increase prevents the harmful effect of brake lining loosening and maintains sufficient braking force to keep the vehicle stationary, thereby ensuring reliable stability during the adaptive transfer process.
3Device complexity
If only the parking brake is actuated during transfer, then the system complexity is reduced, but the vehicle may roll away on icy roads
Solution Approach 1:
The invention applies merging by combining the actuation of both the parking brake and the service brake during the transfer process. Instead of activating only the parking brake, the system merges the functions by simultaneously applying the parking brake while performing an additional autonomous pressure build-up in the service brake. This combined approach ensures that the vehicle remains securely held on icy roads while maintaining a relatively simple control structure.
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
Ensures the vehicle remains stationary safely and quietly without driver intervention, reducing noise and energy consumption by maintaining consistent braking force through simultaneous actuation and autonomous pressure management.
Implementation Method 1
pressure is built up in a master brake cylinder as a function of a brake pedal actuation by the driver and is transmitted to wheel brakes via brake lines filled with a hydraulic medium
Implementation Method 2
If the vehicle is equipped with an electrically actuated parking brake system
Implementation Method 3
An electric parking brake, which acts together with a hydraulic service brake on an application device provided with a friction lining
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a method and to a brake system, in which a vehicle is held by a service brake and a parking brake by autonomous brake actuation, wherein in a first step the service brake is actuated and, when a predetermined condition is met, a transfer from the service brake to the parking brake takes place. According to the invention, during the transfer both an actuation of the parking brake and an additional actuation of the service brake take place.