Resources Contact Us Home
Method and arrangement for controlling the quantity of fuel for an internal combustion engine having a catalytic converter

Image Number 5 for United States Patent #5293740.

The invention is directed to a method for controlling the fuel quantity for an internal combustion engine having a catalytic converter and includes the steps of: determining the air mass flow inducted by the engine; determining a precontrol variable for the quantity of fuel in dependence on current values of operating variables of the engine; presetting a desired lambda value for the air/fuel mixture to be supplied to the engine; checking the actual lambda value of the exhaust gas forward of the catalytic converter; comparing the desired lambda value to the actual lambda value to form a comparison; controlling the fuel quantity in dependence upon the comparison; determining the oxygen actual charge level of the catalytic converter; comparing the determined actual charge level to a desired charge level; and, then, when the actual charge level is greater than the desired charge level, lowering the desired lambda value to below the value one; otherwise, when the actual charge level is less than the desired charge level, increasing the desired lambda value above the value one. This method leads to the condition that very low toxic exhaust gas is produced even for transient operations since the catalytic converter almost always has sufficient storage capacity for further oxygen which occurs temporarily or adequate oxygen for combusting fuel which occurs temporarily. The invention is also directed to an arrangement for carrying out the method.

  Recently Added Patents
Writing pad with synchronized background audio and video and handwriting recognition
Electrode systems, devices and methods
Drawing apparatus and method of manufacturing article
Modulation of the Vps10p-domain receptor family for the treatment of mental and behavioural disorders
Memory management apparatus and memory management method
Methods for PFET fabrication using APM solutions
Fan unit assembly
  Randomly Featured Patents
Safety vest assembly
Semiconductor device and method of fabricating the same
Sound sources separation and monitoring using directional coherent electromagnetic waves
Method of manufacturing semiconductor device and methods of processing, analyzing and manufacturing its substrate
Carrier composition control for liquid chromatographic systems
Methods and systems for converting a single-ended signal to a differential signal
Projection optical system having an angled opitcal part and an offset optical part
Modular support for oversized queen mattress
Solid-state imaging device and imaging apparatus utilizing a dynamic bias current for reduced power consumption