馬力千匹東瀛戰神挑戰特斯拉Model 3 跑2 - 特斯拉
By Brianna
at 2020-07-27T09:48
at 2020-07-27T09:48
Table of Contents
噓 tony24334: 第一場輸沒錯 第二場絕對是偷跑07/26 21:16
推 kazami: 第二場偷跑 而且GTR第一場起步根本大失敗,第二場也沒很07/26 21:32
→ kazami: 成功,根本就還沒好好練過吧...07/26 21:32
推 asukarei: 我沒眼花的話,Model 3兩場都還沒綠燈就在動了07/26 22:52
→ asukarei: 然後GTR就真的起步太爛07/26 22:52
Second Round絕對是偷跑!
用0.25倍播放,紅燈時應該是靜止,結果卻有0.4G加速度
https://i.imgur.com/BAUCuTS.jpg
※ 引述《whitestripe (light me up)》之銘言:
: 原廠GTR
: https://fastestlaps.com/models/nissan-gt-r-nismo
: 1/4 mile 11.0 s @ 128.0 mph
: M3P
: https://fastestlaps.com/models/tesla-model-3-performance
: 1/4 mile 11.8 s @ 114.2 mph
: 重點
: 原廠GTR比M3P快約0.8秒
: 這其實還不是重點
: 我們來看TRAP SPEED
: 128 VS 114
: 也就是 在通過400公尺的終點線時
: 這兩台車的時速差距是22公里......................
: 如果有人會覺得這兩台車同等級的 我真的也沒意見了
: 開心就好 人活著 開心最重要
: TRAP SPEED差了22公里
: 用大家都熟的BMW來舉例
: 這大概會是330跟318的差距
: 這個差距大到即使318變四驅也贏不了330 一樣的意思
: 所以我們可以看到
: 跟原廠GTR比
: 在原地起步 全油門的情況下
: M3P依然可以發揮他的電動馬達優勢
: 但是這絕對不足以讓他贏原廠GTR
: 可是足以讓M3P在通過時速輸了22公里的情況下 秒數只輸0.8秒
: 至於改到1200匹怎麼輸M3P的?????
: 誰知道
: 有可能輪胎根本配不起來
: 有開過性能車的又有改裝的應該都有類似經驗
: 我有過改完以後 0-100秒數慢一秒多的經驗
: 因為輪胎根本抓不住
車輛起步加速能力,受輪胎可提供的最大縱向牽引力影響
https://i.imgur.com/qAS8WE8.jpg
從縱向摩擦係數與滑差(slip ratio)的關係圖
可以看到輪胎可以提供的牽引力有極限,大約在滑差約0.1時達到牽引力峰值
也就是說就算動力系統提供再多動力,輪胎無法抓力
除非用類似火箭的推進力
: 也有可能根本改爛了 根本是120匹
: 有可能哪裡有故障 可是因為改裝太多 故障燈都自己消 結果有問題沒抓到
: 誰知道
增加動力系統馬力,在中後段尾速絕對有優勢
但改裝後四輪配重改變、輸出動力曲線
這種情況搭配原廠循跡系統(甚至可能因為改裝而無法使用循跡系統)
起步真的不見得討便宜
: 一般來說 如果是比"原地"起步 汽油車確實需要比M3P更高的馬力才能贏
: 可能要五百匹甚至550匹左右才可以打平(看後驅或四驅)
: 原地起步電動車確實強
: 但是如果是ROLLING START
: BMW的M3就可以贏M3P 根本不用GTR
: 尤其後段 M3會拉到特斯拉M3P像是不會動一樣
: 一般來說馬力四百多匹就可以在ROLLING START贏M3P
: 如果車子輕一點 400匹就可以了
: https://www.youtube.com/watch?v=FFUutdqUMC4
: 我們可以看到M3原地起步輸M3P
: 但是動態起步M3就足以贏M3P了
: M3P贏1200匹 別鬧 真的
推 hanchueh: 其實沒人開都能發揮正常水準 程式寫好就好了07/26 20:24
→ hanchueh: 史丹佛不就有團隊寫出甩尾漂浮程式07/26 20:25
你講的史丹佛自駕車甩尾
論文:
Toward Automated Vehicle Control Beyond the Stability Limits: Drifting Along
a General Path
發表刊物:ASME(美國機械工程師學會)
Journal of Dynamic Systems, Measurement, and Control的刊物
[後輪驅動]
利用增加後輪縱向力(驅動力),讓車輪合力超過摩擦圓進而打滑甩尾
所以在後軸改裝上大扭力的電機
後輪的合力與分力
https://i.imgur.com/qZTBDpG.jpg
比起Thrust angle,輪胎縱向力對輪胎側向力與輪胎正向力*摩擦係數有更高敏感度
https://i.imgur.com/DZXNMi2.jpg
Thrust angle
https://i.imgur.com/gZHsMsQ.jpg
[轉向]
線控轉向系統需滿足方向盤從左打死點到右打死點要在1秒內完成
因此需要改裝轉向電機
[車輛動態計算]
An Oxford Technical Systems RT4003 dual-antenna integrated RTK-GPS/IMU is used
to obtain vehicle state information at 250 Hz. The controller is implemented
on a dSpace MicroAutoBoxII (DS1401) computer that also runs at 250 Hz, and
interfaces with the steering, throttle, and navigation subsystems.
控制器每4 ms一次取得車輛動態 (250 Hz),計算後並下達轉向、加減速指令
也就是說線控轉向/驅動改裝,加上控制器能即時運算車輛動態
這些都是達成自駕甩尾的硬體條件限制
絕對不是"用一句程式寫好就好"輕描淡寫帶過
推 hanchueh: 油車跑零百要技巧吧 人為不夠完美就會影響成績07/26 20:11
→ hanchueh: 特斯拉只要踩到底就好了 剩下都電腦幫你算好07/26 20:12
動力只要大到一定程度,起步瞬間高扭矩輸出,有可能超過輪胎縱向牽引力極限
因此都相當依賴循跡系統能力
不管油車或電車,只要循跡系統得當,起步都無腦踩就好
推 hanchueh: 規格當然是 Peak 但誰知道是不是真正的 Peak07/26 23:33
→ hanchueh: 之前還有 OTA 直接增加50kW 零百少0.5秒的07/26 23:34
不懂你到底在講啥,不是只看峰值輸出就好
假如peak power從原本300kW(30秒)變成350kW(15秒)
難道這樣算是動力性能有所提升?
要持續輸出絕對是看rated power(額定功率)
而這又取決於電機功率、功率晶片/馬達轉子(永磁)耐溫、散熱系統能力
這些硬體物理特性的限制
可不是OTA更新就能解決的問題
--
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