Vehicle Brake Control Device with Dynamic Force Distribution
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Solution Overview
Problem
Existing brake control devices for vehicles face challenges in managing heat capacity during various braking operations, leading to size and weight increases when trying to accommodate different braking demands, especially between front and rear wheels, which contradicts the need for reduced size and weight.
Innovation Solution
A brake control device with sensors and actuators for each wheel, along with a controller that dynamically adjusts the braking force distribution based on operation patterns, such as short-term high-load and long-term low-load states, to optimize heat capacity and stability, using a ratio-based control strategy to adjust the front and rear wheel braking forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the heat capacity of braking devices is increased by thickening brake disc or enlarging brake caliper, then the braking performance under high braking load is improved, but the size and weight of the braking device increases
Solution Approach 1:
The patent applies dynamics by dynamically adjusting the braking force distribution between front and rear wheels based on real-time detection of braking operation patterns. The controller switches between normal braking force distribution and rear-wheel biased braking force distribution according to whether long-term low-load braking is detected, allowing the system to adapt to varying thermal conditions without requiring oversized braking components.
Solution Approach 2:
The patent changes the parameter of braking force distribution ratio between front and rear wheels. By detecting long-term low-load braking states and adjusting the distribution ratio to bias more braking force toward the rear wheels, the system optimizes heat generation patterns and allows for reduced heat capacity requirements in individual braking devices.
2Reliability
If the heat capacity of braking devices is increased by thickening brake disc or enlarging brake caliper, then the braking capacity under various braking operations is improved, but the overall size of the brake control device increases
Solution Approach 1:
The system dynamically adjusts braking force distribution based on detected operation patterns. When long-term low-load braking is detected, the controller increases rear-wheel braking force ratio, which helps manage heat accumulation differently across wheels, allowing compact braking device design that can handle various braking scenarios without excessive size.
Solution Approach 2:
By changing the braking force distribution parameter dynamically, the system optimizes thermal management across different braking conditions. This allows the use of smaller, more compact braking devices since the distributed heat generation prevents localized overheating that would require larger heat capacity components.
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 approach allows for appropriate heat capacity regulation of both front and rear wheel braking devices, reducing the overall size and weight of the brake control device while maintaining vehicle stability across different braking scenarios.
Implementation Method 1
a front-wheel actuator that presses a friction member against a front-wheel rotary member integrally rotating with a front wheel of the vehicle and thereby generates a front-wheel braking force in the front wheel; a rear-wheel actuator that presses a friction member against a rear-wheel rotary member integrally rotating with a rear wheel of the vehicle and thereby generates a rear-wheel braking force in the rear wheel
Data Source
AI summary
This brake control device includes: an operation amount sensor which detects the brake operating member operation amount; front-wheel and rear-wheel actuators which generate braking force in front/rear wheels; front-wheel and rear-wheel sensors which detect the outputs of the front-wheel and rear-wheel actuators; and a controller which controls the front-wheel and rear-wheel actuators based on the operation amount and the outputs of the front and rear wheels. On the basis of the operation amount and/or the output of the rear wheels, the controller determines whether or not a long-term low-load state in which the friction member is continuously pressed against the rotary members of the rear wheels within a predetermined range over a long period of time is established. If so, the distribution ratio of the rear-wheel braking force to the total applied braking force is decreased compared to when a long-term low-load state is not determined to be established.