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SCT可以觀察供油狀況,我之前的觀念有點不對,直到看到SCT新版手冊,才知道有些數值是相反的觀念!
1.當WOT時,會看到Fuel Trims是OPEN loop
2.Closed Loop時,Short_Term_Fuel_Trims=1.1時,表示混合比過濃,必須減少10%的供油; Short_Term_Fuel_Trims=0.9時,表示混合比過稀,必須增加10%的供油.
3.Closed Loop時,Long_Term_Fuel_Trims=1.1時,表示混合比過稀,必須增加10%的供油; Long_Term_Fuel_Trims =0.9時,表示混合比過濃,必須減少10%的供油.
Long_Term_Fuel_Trims與Short_Term_Fuel_Trims剛好是相反的意思....
給各位有SCT的車友參考!
FYI
原文:
Ford Fuel Trims
When you are at wot you should be in OPEN loop.
Short term trims at WOT display the fuel that you are commanding in the base fuel table
or cold fuel table if certain timers/ect temps are not met.
Example for Closed Loop Operations.
Short_Term_Fuel_Trims
ST trim = .86 Then the pcm thinks the mixture is too lean. ADD 14% fuel
To fix this you would add fuel…do this by increasing the MAF curve in that area.
ST trim = 1.14 Then the pcm thinks the mixture is too rich. Remove 14% fuel
To fix this you would remove fuel....do this by LOWERING the MAF curve in that area.
Long_Term_Fuel_Trims
LT trim = 1.14 Then the pcm thinks the mixture is too lean. ADD 14% fuel
To fix this you would add fuel....do this by increasing the MAF curve in that area.
LT trim = .86 Then the pcm thinks the mixture is too rich. Remove 14% fuel
To fix this you would remove fuel....do this by LOWERING the MAF curve in that area.
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