日本車都採用CVT的原因 - 汽車
By Ina
at 2022-06-11T19:10
at 2022-06-11T19:10
Table of Contents
https://www.youtube.com/watch?v=CSiT479yjwQ
前陣子看到上面的影片,介紹日本市售車為何都用CVT,大致摘要一下
先說我的心得:沒有最好的變速箱,只有最適合的變速箱
CVT的優點:
1.可以讓引擎盡量在最有利的區間運作,節省油耗或是提高加速度
2.機構相對簡單,一樣的覆蓋率(coverage ratio)下CVT的體積比較小
3.換檔頓挫小
CVT的缺點:
1.動力損失較大,效率最佳是齒輪比1:1的時候,也就是低速與高速時效率較差
2.(這點看人的觀點,可以說是feature也可以說是缺點)
大腳加速時反應違反人的直覺:
CVT車會先拉高引擎轉速,變速箱再逐步升檔,車速隨之逐漸上升,駕駛無感
MT、AT與DCT都是先降檔再提高引擎轉速,此時駕駛會感覺被推了一把,有感加速
要強調的是CVT的無感加速不一定比較慢,純屬駕駛的體感
綜合來說,可以得到CVT最適合的環境
1.地形崎嶇或是走走停停,需要在低速時頻繁換檔
此時CVT的優點1節省的油耗可抵銷缺點1增加的油耗,比其他類變速箱省油少頓挫
2.最高速限低,只要車子不要開太快,就不會進入CVT效率較差的高速巡航狀態
3.需要節省車內空間的狀況
日本郊區多山,市區走走停停,最高速限時速100公里,K car暢銷,正好就是最適合
CVT的環境
如果用車環境改成德國的無速限高速公路,高速巡航較為省油的MT、AT與DCT就比較有利了
再加上MT與DCT的構造相近,所需要的引擎特性類似,變速箱產線也很容易互相轉用
德國車廠喜歡生產MT與DCT車完全不意外
美國的話,用車環境介於日本跟德國之間,所以折衷採用AT變速箱
--
前陣子看到上面的影片,介紹日本市售車為何都用CVT,大致摘要一下
先說我的心得:沒有最好的變速箱,只有最適合的變速箱
CVT的優點:
1.可以讓引擎盡量在最有利的區間運作,節省油耗或是提高加速度
2.機構相對簡單,一樣的覆蓋率(coverage ratio)下CVT的體積比較小
3.換檔頓挫小
CVT的缺點:
1.動力損失較大,效率最佳是齒輪比1:1的時候,也就是低速與高速時效率較差
2.(這點看人的觀點,可以說是feature也可以說是缺點)
大腳加速時反應違反人的直覺:
CVT車會先拉高引擎轉速,變速箱再逐步升檔,車速隨之逐漸上升,駕駛無感
MT、AT與DCT都是先降檔再提高引擎轉速,此時駕駛會感覺被推了一把,有感加速
要強調的是CVT的無感加速不一定比較慢,純屬駕駛的體感
綜合來說,可以得到CVT最適合的環境
1.地形崎嶇或是走走停停,需要在低速時頻繁換檔
此時CVT的優點1節省的油耗可抵銷缺點1增加的油耗,比其他類變速箱省油少頓挫
2.最高速限低,只要車子不要開太快,就不會進入CVT效率較差的高速巡航狀態
3.需要節省車內空間的狀況
日本郊區多山,市區走走停停,最高速限時速100公里,K car暢銷,正好就是最適合
CVT的環境
如果用車環境改成德國的無速限高速公路,高速巡航較為省油的MT、AT與DCT就比較有利了
再加上MT與DCT的構造相近,所需要的引擎特性類似,變速箱產線也很容易互相轉用
德國車廠喜歡生產MT與DCT車完全不意外
美國的話,用車環境介於日本跟德國之間,所以折衷採用AT變速箱
--
Tags:
汽車
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