cheris168 wrote:
意思是OD檔OFF後...(恕刪)
應該是這樣
你把OD檔OFF了
(基本來說,最高檔位就是OD檔)
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由不同人駕駛
在市區的油耗
也有好壞之分
通常步調緩慢的人
開起手排車
在市區也能有更好的油耗
同樣的
自排車
由不同人駕駛
在市區的油耗
也有好壞之分
許多人把自排車的檔位簡單區分如下
如四速自排車:
OD on(開).....(平時應該是長on按下是Off...OD/off燈會亮)
檔位1~4檔自動切換
OD off(關閉)
檔位1~3檔自動切換
但是實際上
除了上述之外
OD off(關閉)
檔位1~3檔自動切換的油門反應比起
OD on(開)時
檔位1~3檔自動切換
迅速許多
而
OD on(開)時
檔位1~3檔自動切換的反應如要達到
OD off(關閉)
檔位1~3檔自動切換的效率時
反而需付出更多的油耗以及增加引擎和變速箱的負荷
(車愈重差異愈大)
因此
自排車在市區行駛時
步調緩慢的人
使用OD on(開)
可能能獲得不錯的相對油耗
但步調快的人
使用OD on(開)
反而油耗相對增加更多
建議
不管步調快慢
起步時使用
OD off(關閉)
步調慢的人可於時速20~40公里時,切換為OD on(開)
步調快的人可於時速50~60公里時,切換為OD on(開)
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dennischiu1970 wrote:
但是實際上
除了上述之外
OD off(關閉)
檔位1~3檔自動切換的油門反應比起
OD on(開)時
檔位1~3檔自動切換
迅速許多
而
OD on(開)時
檔位1~3檔自動切換的反應如要達到
OD off(關閉)
檔位1~3檔自動切換的效率時
反而需付出更多的油耗以及增加引擎和變速箱的負荷
(車愈重差異愈大)
網路查到不太一樣的說法：
http://answers.yahoo.com/question/index?qid=20071103103803AAAvzeY
Most cars (like 99%) it simply turns the overdrive gear on or off. 98% of these cars have a 4 speed transmission (some have 5 or more) and keeping the OD switch "off" limits the car to the first 3 gears only. That is ALL IT DOES. There are some cars with a "mode switch" (sport and economy) but this is entirely different, I am thinking of some Mazdas from a few years back. The mode switch will change how the car shifts in terms of the rpm band but typically does not lock out the overdrive gear. Locking out an "OD" switch doesn't change how the first 3 gears shift at all, not one iota. It does not allow the car to go into 4th (or the overdrive) gear which can be handy if you are climbing a steep hill and want to prevent the car from cycling in and out of 4 th ( or the overdrive) gear. It can also help with compression to slow the car when coming down a steep hill.
In some vehicles, like a suburban or other large SUV or chevy or ford full size truck there may be a similar switch on the end of the shift lever. In these heavier vehicle applications it DOES effect how and when the vehicle shifts anticipating that you are towing or have a lot of heavy cargo in the vehicle. These buttons usually say "towing mode" on them.
A little more, if you are curious, about overdrive gearing:
Overdrive refers to any gear ratio which spins the drive assembly from the transmission to the drive wheels FASTER than the rotation of the engine. Think of a ten speed bike when it is in the top gear. You are pedalling very slowly and the wheels are going very fast. Any gear on a 10 speed that has the wheels on the bike spinning faster than you are rotating your legs is an overdrive gear. On a car, because of the huge weight, there is typically only 1 overdrive gear, 4th (or in some cases 5th or 6th gears ).
I would not advise using overdrive in extreme conditions such as towing or extreme grades. Just imagine on a 10 speed trying to climb a steep hill in the top gear!! You'd blow your knees out! That is what is happening to your car. The car will shift out of overdrive before serious damage occurs but you can prolong the life of your vehicle by keeping the overdrive from "kickin in" when you know full well it shouldn't do so.
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cmusic_idv wrote:小弟試著重新說明供大大參考
小弟看那段英文的說法...(恕刪)
上述文中小弟的解讀及附加說明為
大多數四速自排的車輛為使用OD(on/off)
而一些車輛則使用按鍵方式,將其(四速自排)區分為運動及經濟模式
而使用此模式的變速箱並不會如OD(on/off)般限制使用第四檔
而是只改變1~4檔的換檔轉速
而當使用OD(off)時,即限制車輛只能使用1~3檔,而無法使用第四檔
當使用OD(off)時,可增加車輛爬山時的牽引力
當使用OD(off)時,於下坡時也能減緩車速(即是所謂的檔煞)
而小弟前文中所說
使用
OD off(關閉)
檔位1~3檔自動切換的油門反應比起
OD on(開)時
檔位1~3檔自動切換
迅速許多
即是因為當車輛使用OD off(關閉)時
變速箱也會改變檔位1~3檔時的換檔轉速(提供更佳的扭力輸出)
齒輪比是固定不能變的,改變的是換檔時的轉速
而在市區行駛時
車輛幾乎都是在反覆進行著0~60~0公里(舉例)
而車輛於靜止(靜摩擦力)加速(動摩擦力)到較佳燃燒效率的車速時
是最耗油也最損變速箱及引擎的階段
因此小弟的建議
可利用OD off(關閉)或是運動模式
讓車輛迅速脫離此階段再切換為OD on(開)或經濟模式
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