日本車都採用CVT的原因 - 汽車
By Ursula
at 2022-06-12T01:32
at 2022-06-12T01:32
Table of Contents
CVT換檔邏輯在第一篇已經提過了
先升高轉速再變換速度
這是因為CVT動力傳輸面積
由其在鋼帶跟普利盤接觸部分
小於傳統AT的摩擦AB片面積
傳統AT摩擦片本身又是行星齒輪機構
打滑損失還是扭力轉換器部分比重較大
CVT的動力傳遞面積較小
機構上鋼帶跟普利盤是靠擠壓產生摩擦力
AT只要增加油壓就可以加大摩擦力
但CVT不行
鋼帶跟普利盤要靠擠壓維持摩擦
在變速中磨擦面積還會變 AT就沒這問題
改過速克達傳動的人就知道
普利珠改最重 大彈簧改最硬
常常大催油門皮帶一定沒多久就斷
同理汽車CVT也是一樣
要兼顧摩擦損失又不想動力流失又想獲得耐久度
大腳油門下
它換擋邏輯就是變速比不變
先讓引擎轉速提升
然後再慢慢調整變速比
若情況容許就是轉速上升變速比也跟著變
(這比較常發生在中高速區域 起步低速不太可能)
CVT好處就是不管加速減速
都可以讓引擎運作維持在經濟轉速區域
不像AT加減速換檔引擎轉速會下墜上揚
這種換檔掉出經濟轉速的落差
同樣開一天車
AT可以製造上千次
但CVT可能不到一百次
加上CVT零件少
所以CVT確實可以比AT省油
但缺點也很明顯
就是它加速無法搭配踩油門那種線性的感覺
終究是電腦在決定變速比
所以若要考慮駕駛樂趣
CVT不是好的選擇
※ 引述《sammy98 (軍)》之銘言:
: 大家這麼熱衷F1
: 其實CVT其實是F1禁止使用的變速箱
: https://youtu.be/x3UpBKXMRto
: 料件少 無段 在F1中因為跑太快禁止使用
不是跑太快被禁止使用
而是因為配備了CVT
換檔全都是電腦在決定
車手的功能就剩踩油門跟煞車
F1賽車的輸贏就排除了車手的駕駛技巧優劣
這明顯破壞了比賽的平衡
所以才禁用
: 另外說個好玩的volvo是早期使用CVT的車廠
: https://youtu.be/ihfHA6hJKoU
: 因為不怎麼會故障壞掉
: 就算故障5-30分鐘可以自己在家修理
: 後來就消失了
: -----
: Sent from JPTT on my iPhone
另外原po推文講的Regera特殊變速箱
那個其實原本是扭力轉換器
https://www.youtube.com/watch?v=glf_k4qGBAA&t=501s
KOENIGSEGG超跑團隊設想若扭力轉換器功率損失夠小
那原則上根本不用變速箱
因為引擎轉速提升也代表車速會提升
本來是要找日本變速箱大廠幫它們作設計修改
結果得到的回覆太麻煩及無興趣
所以他們就自己設計製造了一個
效果很好
時速超過兩百依然可以動力滑胎
Regera的工程奇蹟還有它的電磁閥汽門
那是另外一件事了...
--
先升高轉速再變換速度
這是因為CVT動力傳輸面積
由其在鋼帶跟普利盤接觸部分
小於傳統AT的摩擦AB片面積
傳統AT摩擦片本身又是行星齒輪機構
打滑損失還是扭力轉換器部分比重較大
CVT的動力傳遞面積較小
機構上鋼帶跟普利盤是靠擠壓產生摩擦力
AT只要增加油壓就可以加大摩擦力
但CVT不行
鋼帶跟普利盤要靠擠壓維持摩擦
在變速中磨擦面積還會變 AT就沒這問題
改過速克達傳動的人就知道
普利珠改最重 大彈簧改最硬
常常大催油門皮帶一定沒多久就斷
同理汽車CVT也是一樣
要兼顧摩擦損失又不想動力流失又想獲得耐久度
大腳油門下
它換擋邏輯就是變速比不變
先讓引擎轉速提升
然後再慢慢調整變速比
若情況容許就是轉速上升變速比也跟著變
(這比較常發生在中高速區域 起步低速不太可能)
CVT好處就是不管加速減速
都可以讓引擎運作維持在經濟轉速區域
不像AT加減速換檔引擎轉速會下墜上揚
這種換檔掉出經濟轉速的落差
同樣開一天車
AT可以製造上千次
但CVT可能不到一百次
加上CVT零件少
所以CVT確實可以比AT省油
但缺點也很明顯
就是它加速無法搭配踩油門那種線性的感覺
終究是電腦在決定變速比
所以若要考慮駕駛樂趣
CVT不是好的選擇
※ 引述《sammy98 (軍)》之銘言:
: 大家這麼熱衷F1
: 其實CVT其實是F1禁止使用的變速箱
: https://youtu.be/x3UpBKXMRto
不是跑太快被禁止使用
而是因為配備了CVT
換檔全都是電腦在決定
車手的功能就剩踩油門跟煞車
F1賽車的輸贏就排除了車手的駕駛技巧優劣
這明顯破壞了比賽的平衡
所以才禁用
: 另外說個好玩的volvo是早期使用CVT的車廠
: https://youtu.be/ihfHA6hJKoU
: 就算故障5-30分鐘可以自己在家修理
: 後來就消失了
: -----
: Sent from JPTT on my iPhone
另外原po推文講的Regera特殊變速箱
那個其實原本是扭力轉換器
https://www.youtube.com/watch?v=glf_k4qGBAA&t=501s
KOENIGSEGG超跑團隊設想若扭力轉換器功率損失夠小
那原則上根本不用變速箱
因為引擎轉速提升也代表車速會提升
本來是要找日本變速箱大廠幫它們作設計修改
結果得到的回覆太麻煩及無興趣
所以他們就自己設計製造了一個
效果很好
時速超過兩百依然可以動力滑胎
Regera的工程奇蹟還有它的電磁閥汽門
那是另外一件事了...
--
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