Brake Actuator Position Control for Safety-Mode Deceleration Compensation
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Solution Overview
Problem
Existing brake systems face issues in providing consistent braking force in safety mode due to failures in electronic actuators, leading to excessive or insufficient braking force, which increases the risk of accidents.
Innovation Solution
A brake system that controls an electronic actuator through both force and position control, using a control unit to calculate target deceleration based on brake pedal information and adjust piston position via a deceleration map, compensating for braking force by readjusting the actuator's position based on current vehicle deceleration, and utilizing an acceleration sensor for longitudinal acceleration detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If force control is used in safety mode, then the braking force can be adjusted, but the reliability of braking force provision deteriorates due to sensor failures or control errors
Solution Approach 1:
The patent replaces force control (which relies on force sensors and feedback control) with position control of the electronic actuator. By controlling the position of the actuator based on a pre-stored deceleration map that correlates actuator position with vehicle deceleration, the system eliminates dependence on force sensors and feedback loops, thereby improving reliability in safety mode while maintaining braking control accuracy.
2Reliability
If position control is implemented based on deceleration map, then the braking force reliability improves, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent implements preliminary action by pre-storing a deceleration map that contains the relationship between electronic actuator positions and vehicle deceleration values before actual braking operations. This pre-computed map allows the control unit to directly determine the required actuator position based on target deceleration without requiring complex real-time calculations or iterative control algorithms, thereby improving braking force consistency while minimizing the increase in control system complexity.
3Measurement precision
If separate sensors are used for force detection, then the braking force measurement precision improves, but the device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the need for separate force detection sensors from the braking system. Instead of using force sensors to measure braking force and provide feedback, the system uses position sensors to detect the electronic actuator's position and refers to a pre-stored deceleration map to determine the corresponding braking force. This extraction of unnecessary sensors reduces device complexity and cost while maintaining sufficient measurement precision through the established position-deceleration relationship.
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 stable braking force compensation in safety mode, preventing accidents by ensuring the vehicle can be driven safely to a service center for inspection without relying on separate sensors, effectively managing braking force through position control of the electronic actuator.
Implementation Method 1
an acceleration sensor for detecting a longitudinal acceleration of the vehicle and transmits the detected longitudinal acceleration to the control unit
Data Source
AI summary
The present disclosure relates to a brake system which controls a piston through force control and position control of an electronic actuator to press a disk and provide braking force and is installed in a vehicle to determine whether a failure has occurred and output a safety mode through an indicator when a failure occurs. The brake system comprises a control unit that controls a position of the electronic actuator to provide braking force and compensates the braking force based on a deceleration of the vehicle when the safety mode is output through the indicator.