Brake Device Motor Idling Detection and Backup
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Solution Overview
Problem
In brake-by-wire systems, when the slave cylinder motor idles or the gear mechanism fails, the system cannot detect abnormalities, leading to delays in switching from slave cylinder to master cylinder braking, causing uncomfortable sensations for the driver.
Innovation Solution
A brake device with a master cylinder, stroke simulator, master cut valve, slave cylinder, and idling detection means that detects motor idling by rotational speed or torque current, allowing rapid backup by the master cylinder when the slave cylinder is incapacitated, and auxiliary braking to maintain deceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the slave cylinder motor is actuated to generate brake fluid pressure, then braking performance is improved, but when the motor idles or gear mechanism fails, the system cannot detect the abnormality causing delay in switching to master cylinder backup
Solution Approach 1:
The patent implements feedback mechanisms through sensors that monitor motor rotational speed, gear meshing status, and brake fluid pressure. The control unit continuously receives feedback signals from these sensors to detect abnormalities in real-time, enabling timely switching from slave cylinder to master cylinder braking when failures are detected.
Solution Approach 2:
The patent introduces intermediate detection components including rotational speed sensors, gear meshing sensors, and pressure sensors that act as intermediaries between the motor actuator and the control system. These intermediaries provide early warning signals of potential failures before complete system collapse occurs.
2Productivity
If the master cut valve is closed to isolate the master cylinder during normal operation, then braking efficiency is improved, but when slave cylinder failure occurs, the backup response is delayed
Solution Approach 1:
The master cut valve is designed with dynamic control capability, allowing it to switch between closed and open states based on real-time system conditions. The control unit dynamically adjusts the valve state to maintain optimal braking efficiency during normal operation while enabling rapid backup activation when failures are detected.
Solution Approach 2:
The system performs preliminary actions by pre-positioning the master cut valve in a closed state during normal slave cylinder operation to maximize braking efficiency. When abnormalities are detected, the control unit rapidly opens the valve to establish the backup pathway, ensuring minimal interruption to braking function.
3Ease of operation
If the stroke simulator is actuated to provide reaction force, then driver feedback is improved, but when slave cylinder motor fails, the system cannot distinguish between normal operation and motor idling
Solution Approach 1:
The patent replaces purely mechanical detection methods with sensor-based detection systems. Rotational speed sensors and gear meshing sensors provide electrical signals that are processed by the control unit to detect motor idling conditions, replacing traditional mechanical indicators with more sensitive and reliable electronic detection.
Solution Approach 2:
The system monitors changes in motor operational parameters including rotational speed, current consumption, and gear meshing frequency. By detecting abnormal parameter patterns such as high rotational speed without corresponding brake fluid pressure generation, the control unit can distinguish between normal operation and motor idling conditions.
Data Source
AI summary
A brake device for a vehicle is provided in which when there is an abnormality in which a slave cylinder becomes incapable of being actuated, a wheel cylinder is actuated using a brake fluid pressure generated by a master cylinder, which is actuated by a brake pedal. Since an idling detector detects idling of a motor when the rotational speed of the motor is greater than a reference value that is set according to the stroke of the slave cylinder, it is possible to reliably and rapidly detect idling of the motor. When the idling of the motor is detected, since a control device opens a master cut valve and the wheel cylinder is actuated by the brake fluid pressure generated by the master cylinder, the slave cylinder, which has become incapable of being actuated, can be backed up rapidly by the master cylinder.