"Closed" vs. "Open Loop"

[Øyvind Ryeng]

Kan noen forklare meg forskjellen? Har det noe med å sette lambdaverdier under visse forutsetninger (kanskje ladetrykk, turtall, lufttemp. osv?) og la datasprutet selv styre bensin (og tenning?) iforhold til de tidligere gitte lamdaverdiene?

 

EDIT:

Ja, jeg har som mål å lære alt om motor og trø linjen "nothing beats cubic inches" ned i halsen på V8-elskerne. Turbo _er_ livet!

[funkes]

dreimemoment dreiemoment dreiemoment

[arildh]

Ryktene sier at:

ECUs have two basic modes: open loop and closed loop operation.

 

Closed loop means that the ECU looks at inputs such as the front O2 sensor and adjusts the fuel for the ideal stoichiometric ratio for maximum efficiency. The ECU makes a change, looks at the O2 readout, makes a change - looping around.

 

Open loop means that the ECU will ignore most of the sensors and run off the pre-programmed fixed fuel and timing maps. These are very rich, partially for safety. For emissions reasons, the stock ECU will run in closed loop as often as possible. Over a certain load - calculated by air flow - the ECU will go open loop.

[maxgets]

Oxygen sensors monitor the amount of oxygen in the exhaust, and the engine control unit (ECU) uses this information to adjust the air-to-fuel ratio in real-time. This is called closed loop control

[Øyvind Ryeng]

Fine greier; takk, takk! Dette har plaget meg i lengre tid! Kjekt å få orden på hvordan saker og ting virker...