Braking Control Device Malfunction Handling
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Solution Overview
Problem
Existing vehicle braking control systems fail to seamlessly adjust operation characteristics when a malfunction occurs, leading to driver discomfort and inadequate notification of the issue.
Innovation Solution
A braking control device with two fluid pressure units, one primary and one secondary, that adjusts brake fluid pressure based on predefined characteristics to match normal operation when functioning correctly, and switches to notification characteristics when a malfunction is detected, ensuring minimal discomfort and effective notification to the driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first fluid pressure unit malfunctions and backup control is activated, then the braking system continues to operate, but the driver experiences discomfort due to noticeable differences in operation characteristics
Solution Approach 1:
The second fluid pressure unit is configured to substantially match the suitability characteristic of the first fluid pressure unit, creating a copy of the normal braking operation characteristics. This allows the backup system to replicate the original system's behavior, making the transition imperceptible to the driver while ensuring continuous operation.
Solution Approach 2:
The control device acts as an intermediary that detects the malfunction and automatically switches between the first and second fluid pressure units. This intermediary function masks the transition from the driver's perspective, maintaining ease of operation while ensuring system reliability.
2Loss of information
If the operation characteristics change noticeably when switching from normal mode to defect mode, then the driver is notified of the malfunction, but the driver experiences discomfort and sudden changes in braking force
Solution Approach 1:
By copying the suitability characteristic in the second fluid pressure unit, the system maintains identical operation characteristics during backup mode. This eliminates sudden changes in braking force while still allowing malfunction notification through other means (such as warning lights or messages).
Solution Approach 2:
The system changes the operational parameters of the second fluid pressure unit to match the first unit's suitability characteristic, rather than using default or altered characteristics. This parameter matching ensures smooth transition without affecting braking smoothness.
3Reliability
If a single fluid pressure unit is used, then the device complexity is low, but the system lacks redundancy and cannot provide backup control upon malfunction
Solution Approach 1:
The second fluid pressure unit is designed with multi-functionality: it can serve as a backup for the first unit, and it can also function independently to provide braking control. This universal design provides redundancy without requiring completely separate backup systems, managing device complexity effectively.
Solution Approach 2:
The braking system is segmented into two independent fluid pressure units, each capable of providing braking control. This segmentation allows one unit to fail while the other continues operation, providing reliability through redundancy while keeping each unit's complexity manageable.
Data Source
AI summary
A braking control device for imparting brake fluid pressure on wheel cylinders in response to operation of a braking operation member to produce braking force includes: first and second fluid pressure units for imparting brake fluid pressure by first and second power sources respectively; and a determining device for determining whether or not operation of the first fluid pressure unit is appropriate. When the determining device determines that operation is appropriate, the first fluid pressure unit imparts brake fluid pressure based on a suitability characteristic, which is the relationship between the brake fluid pressure and the braking operation member operation amount, set in advance. The second fluid pressure unit has proximity characteristics, generally matching the suitability characteristic, and notification characteristics, different from the suitability characteristic. When operation of the first fluid pressure unit is not appropriate, the second fluid pressure unit imparts brake fluid pressure based on the proximity or notification characteristics.