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                      謠言終結者!這筆錢絕對不能省

                      發布時間:2019-07-04 所屬欄目:汽車資訊

                      在各類汽車論壇中我們經常能看到關于胎壓的討論,其中不乏各類大神為車友們做著各種理論分析,“多打氣省油、少打氣舒服”、“別問,問就是2.5BAR”等等論調比比皆是,那么我們就用實驗的形式,為大家展現胎壓的高低會帶來多大的影響。

                      流傳較廣的謠言主要是以上三條,從理論上看起來沒有什么問題,那么我們就對這幾類情況進行實況的實驗。

                      首先我們對油耗進行實驗,測試車輛為2016款一汽豐田RAV4榮放,原車無胎壓監測功能,安裝第三方品牌的內置胎壓監測傳感器。讀數還是比較精準,和充氣泵上顯示的胎壓基本一致。

                      為了減少路況的不確定性,我們將測試路段選為城市環線和高速公路,以中高車速行駛,全程開啟空調。在比較經濟的運行工況下測試油耗的差異。實測數據結果以表顯里程為準。

                      視頻正在加載中...

                      低胎壓行駛有明顯的粘滯感,“給油不走”的形容比較貼切,車輛對地面震動的傳遞變得模糊,加速和制動時,“忽忽悠悠”的感覺比較明顯。

                      調高胎壓之后,車輛提速變得輕快許多,即便在收油之后,靠慣性滑行也能保持較遠的距離。

                      在路況相近的情況下行駛54公里左右,表顯油耗數據有著0.6L的差距,還是比較明顯的,那么是否我們就可以為了省油而使用較高胎壓行駛呢,讓我們在后續的實驗中說明高胎壓的危害。

                      在高胎壓情況下,車輪的濾震性變差,更多的路面震動和沖擊直接傳遞懸掛和車身,給人很強的顛簸感。

                      缺氣情況下,雖然噪音數值增加不多,但是從車廂內的主觀感受上,噪音增加了不少,明顯變得更加吵鬧,舒適性也有明顯下降。

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                      論壇里的物理學霸不是告訴我們,觸地面積越大摩擦力越大么?實際測試結果,缺氣狀態下制動距離有明顯的增加,雖然觸地面積增大,但是缺氣時過軟的胎壁在制動時會有更大的形變,缺乏支撐力,這僅僅是在70km/h的情況下,在更高車速時,制動距離會有更加明顯的差別。

                      實驗至此,前兩條謠言已經被徹底粉碎,第三條謠言的結論雖然成立,但是過于片面,高胎壓行駛的確能帶來油耗上的一些優勢,但是付出的代價是輪胎不均勻磨損帶來的壽命縮短,和產生更多震動犧牲掉的舒適性。為了省油犧牲安全性,絕對不是劃算的選擇。

                      這兩種狀態都會影響輪胎使用壽命,缺氣情況下輪胎胎壁過度變形,反復經過車輪的擠壓,胎壁非常容易出現鼓包的情況,形變過大的輪胎內部溫度的升高也會帶來爆胎的風險;高胎壓狀態時,胎壁過度拉伸也會失去彈性,一旦遇到大的坑洞沖擊,也會有出現鼓包或者直接爆胎的隱患。

                      現在很多車輛都帶有胎壓監測或胎壓報警功能,輪胎帶有內置傳感器的的車型,可以精確顯示實時的溫度與胎壓讀數,是最令人放心的。

                      還有一種是通過ESP系統監控車輪轉速的方式,當輪胎漏氣形變率超過10%,車輪會產生明顯轉速差,當一個輪子和其他輪子轉速不同時,代表它缺氣了。這類胎壓有先天的劣勢,車輪內沒有內置傳感器,無法第一時間發現胎壓異常,等輪胎漏氣到一定程度才能發現;并且它只能告知有輪胎出了問題,但不能顯示哪一個輪胎出了問題,誤報的情況也比較頻繁。

                      在車輛主駕駛側的B柱或者油箱蓋內側,都能找到廠家給出的配套規格輪胎的標準胎壓,例如RAV4榮放這類扁平比達到65的輪胎,我們只需要嚴格遵守這個標準值即可。

                      性能車或者跑車都會裝配扁平比較低的輪胎,例如45、40的扁平比規格,這類輪胎對于胎壓的要求比較嚴格,廠家都會在胎壓銘牌上標明不同負載情況下的標準胎壓,視實際情況做出調整。例如:乘員是否滿載、行李是否滿載,都會有相應最合理安全的胎壓標準。

                      總結:

                      標準胎壓是輪胎自身規格和廠家為車輛匹配之后得出的數值,不能隨意改變,否則將有極大的安全隱患。我總是極力推薦每一位有車的朋友都安裝胎壓監測,從某種角度上講,胎壓監測要比安全氣囊更有意義,它可以預先發現安全隱患,將危機化解在出現之前。由于胎壓監測傳感器的科技含量并不高,目前市面上各個品牌之間沒有明顯的差別,無論是數碼大廠的生態鏈產品還是輪胎廠家的配套周邊產品,都可以放心使用,價格在300~600之間的就完全可以滿足需求。

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