Brake Pressure Control Using Learned Deceleration Feedback
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Solution Overview
Problem
Brake control devices face challenges in maintaining consistent braking performance due to variations in friction coefficient of brake components caused by aging or use conditions, leading to discomfort for occupants and potential precision issues in brake distance during automatic parking or slow-speed maneuvers.
Innovation Solution
A brake control device that includes a hydraulic pressure sensor and an acceleration information sensor, which adjusts hydraulic pressure based on a preset coefficient and learns a new coefficient based on the relationship between hydraulic pressure and acceleration to ensure stable braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same hydraulic pressure is fed to the brake device under the same control, then the brake control is simple and consistent, but the braking torque varies due to changes in friction member state (aging, use conditions)
Solution Approach 1:
The brake control device measures actual deceleration using an acceleration sensor and compares it with target deceleration. Based on the comparison result, the control unit adjusts the hydraulic pressure command to the brake device. This feedback mechanism compensates for variations in friction member characteristics, ensuring consistent braking performance despite aging or wear.
Solution Approach 2:
The system dynamically changes the hydraulic pressure parameter based on measured deceleration and friction member state. By adjusting pressure in real-time according to actual performance, the system maintains reliable braking torque despite changes in friction member conditions over time.
2Device complexity
If a preset coefficient is used for hydraulic pressure control, then the control method is simple, but the precision of brake distance control deteriorates due to friction member variations
Solution Approach 1:
The system uses acceleration sensors to measure actual deceleration and feeds this information back to the control unit. The control unit compares measured deceleration with target deceleration and adjusts hydraulic pressure accordingly, enabling precise brake distance control that adapts to friction member variations without requiring complex preset coefficients.
Solution Approach 2:
The invention replaces complex mechanical adjustment mechanisms with an electronic control system that uses sensors and electronic actuators. This substitution allows for precise, dynamic adjustment of braking force based on real-time measurements, achieving high precision brake distance control through electronic feedback rather than mechanical complexity.
3Device complexity
If hydraulic pressure is controlled without considering actual deceleration, then the control system is simple, but occupant comfort deteriorates due to sudden braking or insufficient deceleration
Solution Approach 1:
The acceleration sensor continuously measures actual deceleration and feeds this data to the control unit. The control unit compares measured deceleration with target deceleration and adjusts hydraulic pressure to match the desired deceleration profile, ensuring smooth and comfortable braking that adapts to actual vehicle behavior and occupant needs.
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 enables stable and precise braking, reducing discomfort for occupants and ensuring accurate brake distance control, regardless of brake component aging or use conditions.
Implementation Method 1
a hydraulic pressure sensor configured to measure hydraulic pressure fed to the brake device
Implementation Method 2
an acceleration information sensor configured to be capable of detecting acceleration of the vehicle and measure acceleration information
Implementation Method 3
a friction member, e.g., a brake pad or a brake shoe, is used. The coefficient of friction of the friction member varies with use conditions, aging, or the like
Data Source
AI summary
To enable achievement of stable braking regardless of influences by aging or the like of a brake device.There is provided a brake ECU 30 for a vehicle 1 with a brake device 11 that can adjust a break force depending on fed hydraulic pressure, the vehicle 1 including: a master pressure sensor 17 configured to measure hydraulic pressure fed to the brake device 11; and a G sensor 44 and a wheel speed sensor 12 configured to be capable of detecting acceleration of the vehicle 1 and measure acceleration information, the brake ECU 30 being configured to include: a pressure command value computation portion 36 configured to determine a hydraulic pressure fed to the brake device 11 at a time of deceleration of the vehicle 1 on a basis of a preset coefficient and cause the determined hydraulic pressure to be fed to the brake device 11; and a brake torque coefficient computation portion 31 configured to learn a coefficient candidate, which is a candidate to change the coefficient, and change the coefficient to the coefficient candidate on a basis of a relationship between the hydraulic pressure and the acceleration.