Electric Booster Force Feedback Control Structure
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Solution Overview
Problem
In electric booster-type braking systems, changes in brake system rigidity lead to an imbalance in pressure between the pedal effort applied to the brake pedal and the braking pressure at the wheel brake, resulting in non-uniform braking, as the braking pressure transmitted by the master piston is not appropriately adjusted.
Innovation Solution
An electric booster with a force-feedback-control structure that includes a master piston, a boosting cylinder, a first screw, a pressure balancing member, and a connecting member, which actively adjusts pressure balance by receiving pressure feedback from outside the master cylinder, comparing pedal effort and motor force, and moving the first screw to maintain a desired boost ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the braking pressure is transmitted by the master piston without pressure feedback adjustment, then the structure is simple, but the pressure balance between pedal effort and braking pressure becomes imbalanced when brake system rigidity changes
Solution Approach 1:
The patent introduces a pressure feedback mechanism where a pressure sensor detects the actual braking pressure and feeds it back to the control unit. The control unit compares this feedback pressure with the target pressure and adjusts the motor-driven screw mechanism accordingly to maintain accurate pressure balance, resolving the pressure balance issue while managing system complexity through intelligent control.
Solution Approach 2:
The patent replaces the traditional purely mechanical pressure transmission system with an electromechanical system. A motor-driven screw mechanism substitutes for direct mechanical linkage, allowing precise adjustment of the master piston position based on pressure feedback, thereby maintaining pressure balance without requiring complex mechanical feedback linkages.
2Force
If the driver engages the brake pedal further to compensate for pressure imbalance, then the braking force can be adjusted, but non-uniformity in braking occurs
Solution Approach 1:
The pressure feedback mechanism continuously monitors the actual braking pressure and provides real-time adjustment signals to the control unit. This ensures that the braking force remains consistent and uniform across different operating conditions, eliminating the need for drivers to apply additional force and preventing braking non-uniformity.
Solution Approach 2:
The system automatically adjusts the braking pressure through the motor-driven screw mechanism in response to pressure feedback, without requiring driver intervention. This self-adjusting capability maintains braking uniformity by compensating for pressure imbalances automatically, preventing the need for drivers to engage the pedal further which would cause non-uniform braking.
3Reliability
If a pressure sensor and motor-driven screw mechanism are added to adjust braking pressure, then pressure balance is improved, but device complexity increases
Solution Approach 1:
The patent uses a motor-driven screw mechanism to replace complex mechanical feedback linkages. This electromechanical approach achieves precise pressure adjustment with simpler mechanical components, as the control logic is handled electronically rather than through complex mechanical means.
Solution Approach 2:
The system adjusts the braking pressure by changing the position of the master piston through motor-driven screw movement. This parameter adjustment approach allows precise control of pressure balance through a single degree of freedom, simplifying the overall system architecture compared to multi-component mechanical feedback systems.
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 minimizes non-uniformity in braking by maintaining the desired gradient of the boost ratio, allowing for automatic adjustment of the motor operation based on the deformed state of the pressure balancing member, ensuring consistent braking performance.
Implementation Method 1
deformed by a difference between two pressures when the two pressures are applied to the contact surfaces in a longitudinal direction of the first screw, respectively
Implementation Method 2
a pressure balancing member disposed to have contact surfaces in contact with the second end of the first screw and the connecting member, respectively, and deformed by a difference between two pressures
Implementation Method 3
a first screw which having a first end connected to the motor and a second end extending into the boosting cylinder, and may be rotated by the motor that operates in conjunction with the brake pedal
Data Source
AI summary
An electric booster is provided having a force-feedback-control structure. The electric booster includes a master piston having a nut unit rectilinearly moved in a booting cylinder space by receiving driving power generated by a motor and a hydraulic pressure generated by a pedal effort. A first screw has a first end connected to the motor and a second end extending into the boosting cylinder, and is rotated by the motor operating with the brake pedal. A second screw is disposed to face the first screw to have a separation space . A connecting member connects the first screw and the second screw. A pressure balancing member has contact surfaces in contact with the second end of the first screw and the connecting member, respectively, and is deformed by a difference between two pressures when applied to the contact surfaces in a longitudinal direction of the first screw, respectively.