電子駐煞車故障警示方法及系統

車輛中心創新前瞻技術研究計畫

本發明提供一種電子駐煞車故障警示系統，包含煞車、直流馬達、電流感測模組、訊號處理模組及警示模組。直流馬達與煞車耦合，並且用來驅動煞車，在直流馬達運轉過程中，會產生一電樞電流訊號。電流感測模組轉換電樞電流訊號成低頻電流訊號及高頻電流訊號。訊號處理模組接收低頻電流訊號與高頻電流訊號，用以估測煞車施力值及馬達轉速值。訊號處理模組更利用煞車施力值及馬達轉速值來評估電子駐煞車的運作狀態，而且可以透過警示模組提醒使用者電子駐煞車處於異常運作的狀態。此外，本發明更可以額外輸出輔助煞車力道以避免煞車力道不足。

A fault warning method of an electric parking brake is provided. The fault warning method includes, a brake is actuated with a motor. An armature current is transmitted from the motor. The armature current is converted to a low frequency current and a high frequency current. A braking force is estimated by the by the low frequency current, and a motor rotating speed is estimated by the high frequency current. The braking force is compared with a predetermined braking force range, and a braking force comparing signal is outputted. The motor rotating speed is compared with a predetermined rotating speed range, and a rotating speed comparing signal is outputted. A determining result is generated by determining the braking force comparing signal and the rotating speed comparing signal. And a warning signal is generated according to the determining result.