車輛系油壓煞車系統失效溫度預警裝置之研發

Development of a Temperature Alarm Device for Failure Prevention of Automobile Hydraulic Brake System

本文主要目的在於研發可應用於車輛油壓煞車系統之失效溫度預警裝置。這個預警裝置是利用溫度感測器，來監控煞車油品溫度以及煞車來令片溫度，而由所量得之溫度將與預警控制參數比對。當其中任何一個溫度超過預警值時，控制單元將會下指令給警報裝置，對駕駛人發出即時之警告訊號，使其採取應變措施。由本實驗結果指出在下坡測試時，速度越快、煞車間距越短，溫度越高（可達 300 ℃-400℃），而這將使得煞車效力降低至安全範圍之下，對於行車安全產生危害。為此本研究試驗中，特別訂定煞車來令片其操作適用溫度範圍為 250℃以下，同時由試驗數據亦證實了 200℃～250℃為合理的安全警戒值設定範圍，所以日後其餘各類型車輛之安全預警值即可依照其來令片使用規範來設定。

As a vehicle slows down, the rapid rising of temperature may result in serious safety concerns of the brake system and its failure could be expected. The main purpose of this study is to develop a device, which can detect high temperatures in the hydraulic brake system, the brake shoe and the fluid, to provide a safety alarm before it fails. The measured temperatures are compared with alarm control parameters. When either one of the temperatures exceeds a preset value, the control unit will send an alarm signal to warn the driver who should then take precaution and/or prevention actions. The experimental results indicated that, at the down slope braking test, fast vehicle speed and shorter braking distance will result in high brake shoe temperature from 300℃ to 400℃. This, in turn, will reduce the brake effectiveness to below the safety margin. Therefore, the allowable temperature of the brake shoe is set to below 250℃ for safety concerns in this research. This had been verified through experiments that 200℃ to 250℃ is a reasonable safety margin for the brake shoe temperature. It can be used as a reference for future vehicle safety regulations.