Vehicle Brake Pressure Control Using Disk Temperature Estimation
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Solution Overview
Problem
Conventional braking systems face challenges in accurately calculating brake disk temperatures, leading to uneven wear of brake pads and inefficient braking force distribution between front and rear wheels.
Innovation Solution
A braking control system and method that calculates the braking force of front and rear wheels using wheel slip ratios and road surface friction coefficients, and then estimates disk temperatures using a predetermined formula, to control the distribution of braking pressure and ensure uniform brake pad wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a lining wear sensor is installed to detect brake pad wear, then the quality of wear detection is improved, but manufacturing cost increases and sensor reliability decreases due to damage or heat damage
Solution Approach 1:
The patent removes the lining wear sensor from the braking system and extracts only the necessary function (wear detection) by using alternative parameters (disk temperature, braking force, wheel slip ratio) that can be obtained from existing sensors and calculations, thereby eliminating sensor reliability issues while maintaining wear detection capability
Solution Approach 2:
The patent introduces disk temperature as an intermediary parameter to indirectly measure brake pad wear. Instead of directly measuring wear with a sensor, the system uses temperature changes of the disk (calculated from braking force and wheel slip ratio) as a mediator to infer wear conditions, avoiding the need for fragile direct-contact sensors
2Device complexity
If outdoor temperature is used to calculate disk temperature, then the complexity of temperature measurement is reduced, but temperature calculation accuracy deteriorates
Solution Approach 1:
The patent replaces the simple but inaccurate outdoor temperature measurement approach with a physics-based calculation system that uses mechanical parameters (braking force, wheel slip ratio) and thermal models to compute disk temperature, thereby improving accuracy while maintaining reasonable complexity through formula-based computation
Solution Approach 2:
The patent changes the input parameters from simple outdoor temperature to a combination of dynamic parameters (braking force, wheel slip ratio, road surface friction coefficient) and uses a thermal model to calculate disk temperature, transforming the temperature estimation from a static approximation to a dynamic accurate calculation
3Ease of operation
If braking force is not accurately distributed according to disk temperature, then the simplicity of braking control is maintained, but brake pad wear uniformity deteriorates
Solution Approach 1:
The patent implements a feedback control system where disk temperature (calculated from braking force and wheel slip ratio) is continuously monitored and used to adjust braking force distribution. The controller modifies the braking force applied to each wheel based on real-time temperature feedback, ensuring uniform wear while maintaining systematic control
Solution Approach 2:
The patent makes the braking force distribution dynamic by continuously adjusting it based on real-time disk temperature conditions. Instead of fixed braking distribution, the system adapts the braking force to each wheel's thermal state, improving wear uniformity while maintaining operational simplicity through automated dynamic adjustment
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
The system achieves accurate temperature calculation and uniform brake pad wear, enhancing braking stability and preventing hard braking operations by warning the driver of excessive temperatures.
Implementation Method 1
a wheel speed sensor configured to detect a wheel speed of front wheels and rear wheels
Implementation Method 2
a procedure of frictional contact between the brake pad and a surface of a brake disk
Implementation Method 3
frictional contact between the brake pad and a surface of a brake disk, rotated together with a tire
Implementation Method 4
calculating temperatures of disks of the front wheels and the rear wheels using the calculated braking force of the front wheels and the rear wheels and a disk temperature estimation formula
Data Source
AI summary
A braking control system and method for a vehicle are configured to calculate a braking force of front and rear wheels using a wheel slip ratio of the front and rear wheels and a road surface friction coefficient and then accurately estimate and calculate a disk temperature of the front and rear wheels using a predetermined estimation formula from the calculated braking force, and control distribution of braking pressure to the front wheels and the rear wheels so as to uniformly wear brake pads based on the calculated temperatures of the disks.