Clutch Engagement Detection for Smooth Brake Release
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Solution Overview
Problem
Conventional hydraulic disk brakes with parking brake mechanisms face challenges in promptly releasing the parking brake for smooth vehicle starting, especially in manual transmission vehicles, due to inaccurate detection of clutch engagement positions caused by factors other than the starting operation.
Innovation Solution
An engagement position storage device that detects and stores the clutch engagement position based on changes in vehicle acceleration, allowing for precise timing of braking force release before actual clutch engagement, using sensors to differentiate between relevant and irrelevant acceleration changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the parking brake is released by rotating the rotating member in response to accelerator pedal activation, then the parking brake can be deactivated, but it takes too long to completely remove the braking force for smooth starting
Solution Approach 1:
The system performs preliminary detection of the clutch engagement position before the actual clutch engagement occurs. By detecting the acceleration change that precedes clutch engagement and storing this position in advance, the parking brake can be released at the optimal moment, ensuring complete braking force removal without delay while enabling smooth vehicle starting.
2Measurement precision
If the clutch engagement position is detected based on acceleration changes, then the clutch position can be identified, but acceleration changes may occur due to other factors such as vibrations or road inclination causing erroneous detection
Solution Approach 1:
The system dynamically adjusts the detection criteria by monitoring both the magnitude and temporal characteristics of acceleration changes. By detecting that the vehicle becomes a traveling state within a predetermined duration after acceleration changes, the system can distinguish between transient vibrations and genuine clutch engagement events, ensuring reliable detection under various driving conditions.
Solution Approach 2:
The system uses feedback from the acceleration sensor to continuously monitor vehicle motion state changes. By comparing the detected acceleration changes against expected patterns for clutch engagement and verifying that the vehicle transitions to a traveling state within the predetermined time window, the system confirms accurate clutch engagement position detection while filtering out false signals from vibrations or road inclination.
3Ease of operation
If the parking brake is released immediately before detected clutch engagement position, then smooth starting can be achieved, but the release timing may be incorrect if the detected position is erroneous
Solution Approach 1:
The system performs preliminary detection and storage of the clutch engagement position based on acceleration changes before the actual clutch engagement occurs. This advance detection allows the parking brake to be released at the optimal moment, ensuring both smooth vehicle starting and accurate release timing by acting on reliably detected positional information before the clutch actually engages.
Data Source
AI summary
Provided is an engagement position storage device capable of detecting a clutch engagement position of a vehicle finely and a brake system including such a device. In an engagement position storage device 2b that stores an engagement position of a clutch to engage and disengage power of a vehicle, when the vehicle becomes a traveling state in predetermined duration after acceleration in a front-back direction of the vehicle changes, the engagement position storage device 2b stores a clutch engagement position based on a clutch position detected when the acceleration changes. A brake system 1 includes a wheel latching mechanism 5 that latches wheels of a vehicle by driving a propelling member 5a by driving devices 3 and 4; and a controller 2 that controls driving of the propelling member 5a of the wheel latching mechanism 5 based on a clutch engagement position stored in the engagement position storage device 2b.