Brake Apparatus Arbitrary Force Ratio Control
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Solution Overview
Problem
Existing brake apparatuses cannot achieve an arbitrary ratio between the actual front wheel and rear wheel braking forces, limiting their ability to perform accurate braking force distribution control and yaw moment control for vehicle stability.
Innovation Solution
A brake apparatus comprising a pedal operation detection section, a brake caliper, a load estimation section, and a force generation section that adjusts caliper force based on detected pedal operations and wheel load differences to generate arbitrary front and rear wheel braking force ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the target value for the difference between front wheel velocity and rear wheel velocity is set to achieve ideal braking force distribution (equal to load ratio), then the front/rear braking force ratio matches the front/rear load ratio, but the braking force ratio cannot be made an arbitrary ratio
Solution Approach 1:
The system changes the control parameter from a fixed target velocity difference (zero for ideal distribution) to a variable target velocity difference that can be adjusted based on driving conditions. By modifying the target value of the velocity difference between front and rear wheels, the system can achieve arbitrary braking force ratios while maintaining accurate control, thus resolving the contradiction between precision and adaptability
Solution Approach 2:
The system transitions from a static control approach (fixed target velocity difference) to a dynamic control approach where the target velocity difference is continuously adjusted based on actual wheel velocities and braking conditions. This dynamic adjustment enables the system to adaptively achieve desired braking force ratios in different driving scenarios
2Adaptability or versatility
If the wheel velocity difference target value is adjusted to make front or rear wheel braking force larger, then the braking force distribution changes, but the actual generated braking force ratio remains unknown
Solution Approach 1:
The system introduces feedback by continuously monitoring the actual wheel velocities and using this information to adjust the braking force application. By measuring the actual velocity difference between front and rear wheels and comparing it with the target velocity difference, the system can accurately determine the actual braking force ratio being generated, thus resolving the measurement accuracy problem while maintaining distribution flexibility
Solution Approach 2:
The system uses the velocity information from the wheels themselves to control the braking forces. By utilizing the actual wheel velocity data to regulate the braking application, the system automatically achieves the desired braking force ratio without requiring external measurement devices, enabling both flexible distribution and accurate knowledge of the actual ratio
Data Source
AI summary
A brake apparatus is provided that can make a ratio between a front wheel braking force and a rear wheel braking force that is actually generated into an arbitrary ratio. This brake apparatus includes a pedal operation detection section that detects a pedal stroke or a brake pedal force produced by a brake pedal operation; a brake caliper that is provided in each wheel of a vehicle and that generates a caliper force that is in accordance with a detection value of the pedal operation detection section; a load estimation section that estimates a load of each of the wheels; and a force generation section that, after judging that braking is performed in a state in which a load difference exists between left and right wheels of the vehicle based on a value that is estimated by the load estimation section, even if the pedal operation detection section detects a pedal stroke or a brake pedal force that is the same as for the braking at a time of judging or for braking prior to the judging, generates a caliper force that is different to the caliper force before the judgment.