Electric Booster Brake Pedal Feel Control via Dynamic Nut Displacement
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Solution Overview
Problem
Electric booster brake systems without a pedal simulator face challenges in replicating the proper pedal feel experienced in vacuum booster systems, leading to difficulties in providing a sensitive and consistent braking experience for drivers.
Innovation Solution
A braking apparatus and control method that includes a first master cylinder generating hydraulic pressure, a second master cylinder creating braking pressure through a motor-driven piston, and a control unit calculating and updating the required displacement position of a nut based on the brake pedal stroke to optimize the braking force distribution, thereby enhancing the pedal feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an electric booster brake system operates without a pedal simulator, then cost and device complexity are reduced, but pedal feel quality deteriorates
Solution Approach 1:
The patent replaces the mechanical pedal simulator system with an electric motor-driven booster mechanism. The motor generates boosting force directly through electromagnetic conversion, eliminating the need for complex mechanical components like solenoid valves and rubber dampers, while maintaining cost-effectiveness and improving pedal feel consistency
Solution Approach 2:
The patent dynamically adjusts the boosting ratio of the electric motor based on detected pedal stroke and braking conditions. By changing the motor's output force parameters in real-time, the system compensates for the absence of a pedal simulator and provides consistent pedal feel without requiring additional mechanical components
2Force
If the boosting ratio of the electric booster is increased to reduce driver effort, then braking force is improved, but pedal feel sensitivity deteriorates
Solution Approach 1:
The patent implements a dynamic boosting ratio control system where the electric motor's output force is continuously adjusted based on real-time detection of pedal stroke position and braking conditions. This dynamic adjustment maintains high braking force while preserving pedal feel sensitivity by adapting the boosting ratio to match driver input intensity
Solution Approach 2:
The system uses a pedal stroke detector to provide real-time feedback on driver input, which the control unit uses to adjust the motor's boosting force accordingly. This closed-loop feedback mechanism ensures that the boosting ratio is optimized for both braking force and pedal feel sensitivity under varying operating conditions
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 solution improves the pedal feel for drivers in electric booster brake systems without a pedal simulator, optimizing the braking force distribution and reducing the impact of friction forces, resulting in a more sensitive and consistent braking experience.
Implementation Method 1
a force of an electric booster (or motor) using electrical energy
Implementation Method 2
a first master cylinder configured to create hydraulic pressure as a brake pedal is pressed
Implementation Method 3
a second master cylinder configured to create braking pressure through a piston which is pressed by the hydraulic pressure created by the first master cylinder
Data Source
AI summary
A braking apparatus of a vehicle may include: a first master cylinder configured to create hydraulic pressure as a brake pedal is pressed; a second master cylinder configured to create braking pressure through a piston which is pressed by the hydraulic pressure created by the first master cylinder and a nut moved by rotation of a motor; and a control unit, configured to: calculate a required displacement position of the nut based on a pedal stroke of the brake pedal, and update the required displacement position based on a displacement position of the nut at a dead stroke end point where the pedal stroke moves away from a dead stroke section of the first master cylinder.