Power Brake Pressure Gradient Control for Low-Noise Braking
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Solution Overview
Problem
Existing power brake systems generate noise and vibrations due to high motor speed gradients, which are perceptible to the driver and affect driving comfort and safety.
Innovation Solution
A method to control the maximum permissible pressure gradient in a power brake system by calculating it based on current motor speed and speed gradient, limiting motor speed to prevent perceptible vibrations and noise, and transmitting this limit to brake pressure demand units to ensure the requested pressure gradient does not exceed this threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor speed gradient is increased to achieve higher pressure gradient, then the braking performance is improved, but noise and vibrations become perceptible to the driver
Solution Approach 1:
The system dynamically adjusts the motor speed gradient based on current operating conditions (motor speed, requested pressure gradient) to maintain optimal braking performance while preventing perceptible noise and vibrations. The control unit continuously calculates and adapts the maximum permissible motor speed gradient, transforming the static limit into a dynamic parameter that responds to real-time system state.
Solution Approach 2:
The invention changes the parameter of motor speed gradient from a fixed high value to a dynamically calculated value that varies with motor speed and braking demands. By continuously adjusting this parameter within permissible limits, the system achieves effective braking while maintaining comfort levels.
2Object-affected harmful factors
If the motor speed is limited to reduce noise and vibrations, then driving comfort is improved, but the maximum pressure gradient capability is reduced
Solution Approach 1:
The system employs dynamic control where the motor speed and motor speed gradient are continuously adjusted based on real-time conditions. This allows the system to operate at higher speeds and gradients when necessary for braking performance while maintaining lower, comfort-oriented speeds during normal operation, thus resolving the contradiction between performance capability and comfort.
Solution Approach 2:
The control unit receives feedback about the requested pressure gradient and current motor speed, then calculates the maximum permissible motor speed gradient accordingly. This feedback loop ensures that the system maintains optimal balance between achieving required pressure gradients and limiting noise/vibrations to imperceptible levels.
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
Significantly reduces noise and vibrations by limiting motor speed gradients to imperceptible levels, enhancing driving comfort and safety, especially in critical braking situations.
Implementation Method 1
an electric motor of the power pressure generator is controlled correspondingly to axially move a piston connected to a spindle drive unit in order to generate a pressure
Implementation Method 2
the brake pressure is not usually generated via the brake pedal but via an power pressure generator
Data Source
AI summary
A method for controlling a maximum permissible pressure gradient of a power brake system of a motor vehicle. The method includes continuously calculating a maximum permissible pressure gradient, starting from a current motor speed gradient and motor speed of an external-force brake pressure generator, taking into account a predefined maximum permissible motor speed and a predefined maximum permissible motor speed gradient. In a next step, the maximum permissible pressure gradient is continuously transmitted to brake pressure demand units, so that, in the case of a braking event, the pressure gradient requested by the brake pressure demand units or resulting from a requested pressure is generally less than or equal to the maximum permissible pressure gradient.