Multiplicative adaptation
If closed loop continuously corrects a deviation in the fuel system, it will be adapted. Adaptation occurs every 5 minutes and takes 30 seconds.
The fuel quantity is always multiplied by a multiplicative adaptation factor of 1.00 when the control module is new or has been disconnected. Multiplicative adaptation takes place under conditions of partial load. Purging is stopped during adaptation because other factors that can affect the fuel must not be active.
The entire closed loop deviation from 1.00 is transferred to the multiplicative adaptation factor. This means that the correct fuel quantity will be injected even when closed loop is inactive, e.g. when cold starting or driving under full load. A multiplicative adaptation must always take place before an additive after starting the engine. Limits for multiplicative adaptation are 0.75 and 1.25 respectively.
The following conditions must be fulfilled for multiplicative adaptation to take place:
- Closed loop active.
- No purging in progress; this takes place for 4 minutes and 30 seconds during each 5-minute period. However, a multiplicative adaptation will take place directly the first time the other conditions have been fulfilled.
- Engine coolant temperature exceeds 76°C.
- Engine speed 1500-2750 RPM.
- Engine load 175-350 mg/c.
If closed loop continuously corrects a deviation in the fuel system, it will be adapted. Adaptation occurs every 5 minutes and takes 30 seconds.
The fuel quantity is always multiplied by a multiplicative adaptation factor of 1.00 when the control module is new or has been disconnected. Multiplicative adaptation takes place under conditions of partial load. Purging is stopped during adaptation because other factors that can affect the fuel must not be active.
The entire closed loop deviation from 1.00 is transferred to the multiplicative adaptation factor.
This means that the correct fuel quantity will be injected even when closed loop is inactive, e.g. when cold starting or driving under full load. A multiplicative adaptation must always take place before an additive after starting the engine. Limits for multiplicative adaptation are 0.75 and 1.25 respectively.
The following conditions must be fulfilled for multiplicative adaptation to take place:
- Closed loop active.
- No purging in progress; this takes place for 4 minutes and 30 seconds during each 5-minute period. However, a multiplicative adaptation will take place directly the first time the other conditions have been fulfilled.
- Engine coolant temperature exceeds 75°C.
- Engine speed 1500-2750 RPM.
- Engine load 175-350 mg/c.