Vehicle Brake Device Backup Power Segmentation
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Solution Overview
Problem
Existing brake devices for vehicles face challenges in maintaining brake performance during power supply fluctuations, leading to increased costs and potential discomfort for drivers due to the need for large electrical capacity or additional booster circuits.
Innovation Solution
A brake device that limits electromagnetic valves to specific ones for backup operation, using an electric power supply part to secure backup power for these valves, ensuring continued operation during momentary power interruptions and reducing overall electrical capacity requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all electromagnetic valves are backed up with large electrical capacity, then brake performance is secured, but cost increases
Solution Approach 1:
The patent segments the electromagnetic valves into two categories: critical valves (master cut valve and simulator cut valve) that require backup power, and non-critical valves that do not. This segmentation allows the system to provide backup power only where necessary, reducing the overall electrical capacity requirements while maintaining essential brake functions during power interruptions.
Solution Approach 2:
The patent applies local quality by providing different levels of power backup to different electromagnetic valves based on their functional importance. Critical valves receive backup power from capacitors to ensure operation during power interruptions, while non-critical valves rely on normal power supply, creating a differentiated quality approach that optimizes cost-performance balance.
2Reliability
If a booster circuit is provided to cope with power decrease, then brake operation is maintained, but cost increases
Solution Approach 1:
The patent extracts and isolates only the essential electromagnetic valves that require backup power support, removing the need for a comprehensive booster circuit. By identifying and backing up only the master cut valve and simulator cut valve, the system achieves reliable brake operation during power interruptions without the expense of a full-system booster circuit.
3Ease of manufacture
If electrical capacity is reduced to lower cost, then cost decreases, but driver comfort may deteriorate
Solution Approach 1:
The patent segments the electromagnetic valves affecting driver comfort into critical (simulator cut valve) and non-critical categories. The simulator cut valve, which directly impacts brake pedal feel and driver comfort, is equipped with backup power to maintain normal operation during power interruptions, while other valves are prioritized differently, achieving cost reduction without sacrificing driver comfort.
4Ease of manufacture
If electrical capacity is reduced to lower cost, then cost decreases, but brake performance may deteriorate
Solution Approach 1:
The patent segments electromagnetic valves by their impact on brake performance, identifying the master cut valve as critical for maintaining brake function during power interruptions. By providing backup power specifically to this valve while reducing or eliminating backup for other valves, the system maintains essential brake performance while significantly reducing the required electrical capacity and overall cost.
Solution Approach 2:
The patent applies local quality by providing concentrated backup power resources to the master cut valve, which is essential for brake performance, while accepting reduced functionality in other valves during power interruptions. This localized quality approach ensures critical brake functions remain reliable while optimizing cost efficiency.
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 reduces costs while maintaining brake performance and merchantability by prioritizing backup power for critical electromagnetic valves, minimizing driver discomfort and preventing a decrease in brake device merchantability.
Implementation Method 1
an electric power supply part configured to supply electric power from an electric power storage device installed on the vehicle, for operations of the plurality of electromagnetic valves
Implementation Method 2
a valve mechanism including a plurality of electromagnetic valves to be controlled by electric signals, for carrying out transmission of the hydraulic pressure output from the master cylinder or the power hydraulic pressure source
Data Source
AI summary
A master cylinder generates master cylinder pressures in response to a brake operation by a driver on a brake pedal. A power hydraulic pressure generation device includes a pressure pump and an accumulator, and the accumulator accumulates an accumulator pressure increased by the pressure pump. A hydraulic pressure control valve device includes holding valves, pressure decreasing valves, and master cut valves for carrying out transmission of the master cylinder pressures from the master cylinder or the accumulator pressure from the accumulator. A stroke simulator is connected to a master pressure pipe via a simulator cut valve. The normally-open master cut valves and the normally-closed simulator cut valve for carrying out transmission of the master cylinder pressures mechanically generated by the master cylinder are backed up with backup electric power so that the operations continue even in the event of a change in state of electric power supply.