Brake Controller Dynamic Variation Range for Stability
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Solution Overview
Problem
Conventional electronically controlled brake systems face challenges in stabilizing braking effectiveness due to variations in vehicle operating conditions and external factors, leading to unpredictable deceleration and braking force, which can cause unnatural braking sensations for the driver.
Innovation Solution
A brake controller that calculates an index for the difference between expected and actual braking effectiveness, adjusts the target braking force, and sets a variation range for correction to stabilize braking, accounting for factors like friction member abrasion and temporary changes such as vehicle weight or temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adaptive coefficients are obtained from deceleration error signal to compensate brake deterioration, then long-term brake performance is improved, but unexpected variations in correction amount occur due to external disturbances and abnormalities
Solution Approach 1:
The patent implements dynamic adjustment of the variation range based on detected vehicle operating conditions. The control unit modifies the allowable variation range of correction amounts according to detected parameters such as vehicle speed, brake pressure, and temperature, enabling the system to adapt to changing conditions while maintaining stability.
Solution Approach 2:
The patent changes the parameter of variation range dynamically based on operating conditions. By adjusting this parameter according to detected vehicle states, the system optimizes the balance between compensating for brake deterioration and filtering out noise from external disturbances.
2Reliability
If correction amount is increased to compensate for brake deterioration, then braking effectiveness is restored, but unnatural braking sensation is imparted to driver
Solution Approach 1:
The patent employs feedback control by continuously monitoring actual deceleration and comparing it with target deceleration. The correction amount is adjusted based on the deceleration error signal, creating a closed-loop control system that automatically fine-tunes braking force to maintain natural braking sensation while compensating for deterioration.
Solution Approach 2:
The system dynamically adjusts correction amounts based on real-time deceleration feedback. By making the correction adaptive rather than fixed, the system maintains natural braking characteristics across different operating conditions while effectively compensating for brake deterioration.
3Stability of the object's composition
If variation range of correction amount is limited to suppress unexpected variations, then braking stability is improved, but compensation for long-term brake deterioration is restricted
Solution Approach 1:
The patent implements dynamic variation of the correction range based on detected operating conditions. The control unit adjusts the variation range parameter according to vehicle state, allowing larger corrections when conditions permit and smaller corrections when stability is prioritized, thus resolving the contradiction between stability and compensation capability.
Data Source
AI summary
A brake controller is provided that includes a braking force application mechanism that presses a friction member against a braked member so as to apply a braking force to a wheel of a vehicle; and a control unit. The control unit calculates an index, which indicates a difference between an expected braking effectiveness and an actual braking effectiveness, corrects a target value, which is set to control a pressing force of the friction member, in accordance with the index to reduce a variation in a braking effectiveness of the vehicle. The control unit further sets a variation range in accordance with a factor that causes the difference. The variation range limits a variation in a correction amount to correct the target value.