| 摘要 |
PURPOSE:In the air-fuel control employing a micro-computor, to improve the operationability under the low temperature by lapping the correction fuel amount due to the engine temperature detection over the required fuel amount to be determined when detecting the heavy load state at the suction pressure. CONSTITUTION:An air-fuel ratio controller 12 employing a microcomputor will perform the A/D conversion on the suction negative pressure Vc and the engine temperature Tw and inputs together with the rotation N. When the engine temperature drops below the predetermined level, the density correction duty DKA for densifying the air-fuel ratio is set to produce the duty D=DMAP+DKA which is outputted to the slow main solenoid, thus to produce the theoretical value of the air-fuel ratio from the DMAP irrespective of the operational condition and to correct the engine temperature by means of the DKA. Furthermore when the operational condition is in the power region, it is densified by a power valve and the on duty DELTAD for densifying the DELTAA against the engine temperature is added to the DKA, but since the DELTAD is the function of the DKA the densifying factor Kvc is obtained from the suction negative pressure to produce D=DMAP+ KvcXDka. |
