Vehicle Brake Control Apparatus Motor Position Rigidity Correction
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Solution Overview
Problem
Existing brake control systems for vehicles face challenges in maintaining consistent braking forces between left and right wheels due to variations in graphs representing the relationship between motor position and pad-pressing force, caused by aging and ambient temperature changes, leading to potential vehicle instability and safety risks.
Innovation Solution
A brake control apparatus that includes a vehicle controller to detect and correct the drive data by acquiring control data during vehicle-stabilizing operations, using a rigidity graph to ensure consistent pressing forces across all wheels, regardless of sensor noise or actuator aging, by updating the stored drive data based on actual motor positions and pressing forces during braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the relationship between motor position and pad-pressing force is constructed using motor current and motor position data, then the pressing force can be estimated from motor displacement, but the graph varies due to aging and ambient temperature variations causing large differences between actual and recognized pressing forces
Solution Approach 1:
The system performs vehicle-stabilizing control during braking operations and uses the results to correct the rigidity graph. The controller acquires control data from actual braking operations, compares it with stored drive data, and updates the graph to reflect actual conditions. This feedback mechanism ensures the pressing force recognition remains accurate despite aging and temperature variations.
Solution Approach 2:
The system changes the parameters used to construct the pressing force estimation by transitioning from using only motor current and position to using actual control data acquired during vehicle-stabilizing control. This parameter change allows the system to adapt to aging and environmental variations by incorporating real-world operational data into the rigidity graph.
2Ease of operation
If different brake devices are used for left and right wheels, then individual brake control is possible, but the graphs representing the relationship between motor position and pad-pressing force differ between devices causing unequal braking forces
Solution Approach 1:
The system performs vehicle-stabilizing control that specifically addresses braking force balance between left and right wheels. By acquiring control data during actual braking operations and using it to correct the rigidity graphs for each wheel, the system ensures that individual brake devices maintain consistent pressing forces despite manufacturing variations and aging.
Solution Approach 2:
The system aims to create equipotential conditions between left and right wheels by ensuring both wheels have identical rigidity graphs after correction. This is achieved by performing vehicle-stabilizing control that balances the braking forces, making the system symmetric in terms of braking performance despite using separate brake devices for each wheel.
3Reliability
If the rigidity graph is corrected using control data from vehicle-stabilizing control, then consistent pressing forces are achieved across all wheels, but additional control operations are required during braking
Solution Approach 1:
The system merges the rigidity graph correction function with the vehicle-stabilizing control function. Instead of performing separate correction operations, the system acquires control data during normal braking operations and uses it to update the rigidity graphs. This integration reduces the need for additional dedicated correction operations while maintaining pressing force consistency.
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 ensures stable vehicle braking by maintaining equal pressing forces on both wheels, enhancing safety and preventing vehicle instability due to braking force discrepancies, and allows for regular corrections during inspections to address actuator aging.
Implementation Method 1
an electromotive device, such as a motor
Implementation Method 2
generates a braking force by moving the piston so as to bring a brake friction member into contact with an object to be braked
Data Source
AI summary
A brake control apparatus for a vehicle having brake devices for generating pad-pressing forces at respective wheels includes brake control units for individually controlling the pad-pressing forces at the respective wheels; a storing unit for storing drive data required for controlling the pad-pressing force at each wheel; a vehicle-driving-state detector for detecting a driving state of the vehicle; and a vehicle controller for controlling a vehicle driving state using the brake control unit for each wheel. Memory data representing the relationship between a motor position and the pad-pressing force is updated using the state of brake actuators obtained when the driving state of the vehicle is stabilized by operating the brake devices during braking.