Brake Cleaning via Dynamic Pressure and Torque Compensation
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Solution Overview
Problem
Existing braking systems for motor vehicles with friction brakes face challenges in cleaning brake surfaces without causing noticeable vehicle deceleration, especially when deposits like ice impair braking performance.
Innovation Solution
A method and device that adjust braking pressure over time using a predetermined braking pressure curve, allowing for compensatory motor torque adjustments to maintain constant vehicle speed during cleaning operations, ensuring no noticeable deceleration occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If braking pressure is increased to effectively clean brake surfaces, then cleaning effectiveness is improved, but vehicle deceleration becomes noticeable and driving comfort deteriorates
Solution Approach 1:
The braking pressure is not applied statically but dynamically varied over time according to a predefined curve. The pressure starts at zero, increases to a maximum cleaning pressure, and then decreases back to zero, creating a time-dependent dynamic process that limits the duration and intensity of deceleration while maintaining cleaning effectiveness
Solution Approach 2:
The cleaning operation is performed as a periodic cyclic process with distinct phases (rise phase and plateau phase) repeated over time. This periodic application of braking pressure allows cleaning to occur in controlled intervals rather than continuous high-pressure application, reducing noticeable deceleration while maintaining cleaning effectiveness through repeated cycles
2Reliability
If braking pressure is applied for a predetermined period to clean brake surfaces, then cleaning effectiveness is improved, but fuel consumption increases due to compensatory motor torque
Solution Approach 1:
Instead of applying maximum braking pressure continuously for an extended period, the system applies partial braking pressure in controlled phases. The rise phase applies increasing pressure only as needed to reach cleaning effectiveness, and the plateau phase maintains pressure only for the minimum necessary duration, avoiding excessive energy consumption while achieving sufficient cleaning
Solution Approach 2:
The braking pressure curve is predefined and prepared in advance, with the rise phase gradually building pressure before the cleaning-critical plateau phase. This preliminary gradual increase allows the system to prepare for the cleaning action efficiently, minimizing the total time high pressure is needed and thus reducing fuel consumption during compensatory motor torque application
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 effective cleaning of brake surfaces without affecting driving comfort, even during dynamic vehicle operations, by gradually increasing braking pressure and compensating with motor torque, thus preventing fuel wastage and maintaining smooth vehicle dynamics.
Implementation Method 1
the brake pads are usually pressed against the brake surface at low pressure for a predetermined period of time in order to clean the brake surfaces by scraping and/or evaporation
Implementation Method 2
the brake pads are usually pressed against the brake surface at low pressure for a predetermined period of time in order to clean the brake surfaces by scraping and/or evaporation
Data Source
AI summary
The invention relates to a method for carrying out a cleaning operation for at least one braking device of a braking system in a motor vehicle, said method having the following steps:setting a braking pressure by components of the braking device in accordance with a predefined braking pressure curve, wherein the braking pressure curve, during the cleaning operation, specifies braking pressures that vary over time for the braking device,correcting a setpoint motor torque that is to be provided by a drive motor of the motor vehicle and that is dependent on a braking effect brought about by the set braking pressure,the predefined braking pressure curve being selected such that a longitudinal deceleration of the motor vehicle, which is brought about by the predefined braking pressure curve, can be compensated for by a corresponding additional motor torque.