Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Method and system for controlling emissions from an internal combustion engine










Image Number 3 for United States Patent #5505183.

A method and system for reducing emissions from an engine during periods of partial or total heated exhaust gas oxygen (HEGO) sensor failure. A switch point is stored in an electronic engine control for use in controlling the fuel delivered to the engine based on the value of the signal generated by the oxygen sensor relative to the switch point. The method includes the step of sensing the current of the heater element of the HEGO sensor. The sensed current is compared to a first predetermined current threshold which indicates a degradation of the HEGO sensor. A degradation of the HEGO sensor introduces a bias signal to the electronic engine control. If the current of the heater element is below the first predetermined current threshold but not below a second predetermined current threshold, the switch point is changed so as to compensate for degradation of the oxygen sensor. The electronic engine control then controls the delivery of fuel to the engine based on the value of the signal generated by the oxygen sensor relative to the changed switch point until the HEGO sensor is replaced.








 
 
  Recently Added Patents
Methods and systems for detecting icing conditions
Pet burial pod
Secondary battery pack including insulative mounting member into which PCM is inserted in lateral direction
Controlling a resource demand system
Projection screen and projection system having the same
Packaging sleeve
Oral care implement accessory
  Randomly Featured Patents
Non-lethal weapon firing and frangible, weighted paint ball
Decorative novelty articles
Fluorescent lamp having uniquely configured container containing amalgam for regulating mercury vapor equilibrium
Installation structure of release pipe in fuel cell vehicle and fuel gas vehicle
Positioning and bonding method
Isolating positioning boom for instrument platform
Chain saw guide bar with chain-tightening device
Electronic apparatus and method of cooling the electronic apparatus
Biodegradable polystyrene foaming products
Hand mixer