請教,油電車的機械煞車介入時機點為何?彼方時速多少以下由電磁煞車改機械煞車?
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以下節錄自 https://www.ptt.cc/bbs/car/M.1494238308.A.6C1.html
高速輕煞減速模式:此時透過MG2直接回收動力進大電池來達到電磁再生制動的優勢,不僅可以減緩車速, 還可以把多餘的能量回收交給下次使用。
高速重煞模式:為保護電池,MG2再生發電功率有限(電流太大電池無法負荷),當電磁制動力不足時, 來令片的機械煞車就會介入輔助,兩者一起煞車。
低速輕煞模式:前期還是靠MG2回收動能,但因馬達運轉速度沒到一定程度的時候,會無法提供一個 有效的電磁制動能力,故會有一個銜接期大概在12Km/h時會轉換機械煞車,這個非線 性區,讓油電車主對煞車的控制性會覺得有點難控制。
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另外這一篇是在探討為何Prius在2010因煞車問題而召回,裡面對於電磁煞車作動的時機也說明得相當詳細, 基本上也是兩個原則
1. 機械煞車是否介入視煞車力道而定, 優先使用電磁煞車, 不足的部分再由機械煞車補上

2. 車子將停(時速約8~11Km/h)時, 電磁煞車會退場, 改由機械煞車接手(銜接期約1秒), 一直到停
Even at low speeds, regen is limited. As the vehicle slows to a stop (typically between five and seven miles per hour) the regenerative braking force is ramped down and the friction force is ramped up.

圖片出處
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這篇也提到, 機械煞車會在車速11Km/h以下接手; 另外也提及, 在輕煞時, 後輪的機械煞車會輕微作動, 因此後輪來令片的磨損會比前輪多兩三倍
The Toyota Prius has unique requirements for the brake system. On 2001-’04 models, the hydraulic brakes are not used until the vehicle is below 7 mph or if the vehicle has to make a hard stop.
During many light-braking events, the rear friction brakes will be lightly applied and the front may not be applied at all until the vehicle is at a stop or near stop. For this reason, it is normal for a hybrid to wear the rear brake pads two and three times faster than the front pads.




























































































