Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Method and system for controlling combustion engines










Image Number 4 for United States Patent #5769049.

A method and system for controlling combustion engines by detection of the present air/fuel ratio within the cylinders of the combustion engine, using an analysis of the characteristics of the ionization current, as detected via a measuring gap with a bias voltage applied being arranged in the combustion chamber, preferably using the spark plug gap in an Otto-engine. A measuring voltage corresponding to the degree of ionization is detected during the flame ionization phase and during a time- or crankshaft position dependent period A, B, C or D, which duration is dependent of the present air/fuel ratio, and will be finished by an amplitude maximum PF during the flame ionization phase. A parameter characteristic for the fundamental frequency of the measuring voltage during the period A, B, C or D is detected, which parameter indicates a tendency towards the rich direction of stoichiometric when the fundamental frequency increases, and inversely indicates lean tendency when the fundamental frequency decreases. The fundamental frequency is preferably detected from the differential value of the measuring voltage during the period A, B, C or D, in respect of time t or crankshaft degrees VC. dU.sub.ION /dt respectively dU.sub.ION /dVC. The differential value multiplied with a constant is used at least partly when determining a relative or absolute air/fuel ratio.








 
 
  Recently Added Patents
Method to quantify siRNAs, miRNAs and polymorphic miRNAs
Statistical identification of instances during reconciliation process
Emergent information database management system
Microfluidic system incorporating a metal impregnated nanoporous material in a microfluidic pathway thereof
Dual-leadframe multi-chip package and method of manufacture
(4949
Image scanner and image forming apparatus
  Randomly Featured Patents
Walker having braking system
Organic electro-luminescence display
Control system for magnetic positioning device
Multiple step printing methods for microbarcodes
Twist lock wall plate
Systems and methods for performing workflow
Electrolyte for batteries and battery packs
Command queueing speculative write prefetch
Car wash
Electron beam system and method of manufacturing devices using the system