Resources Contact Us Home
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
Wireless control system for a patient support apparatus
Error correct coding device, error correct coding method, and error correct coding program
Semiconductor device and method of manufacturing the same
Pressure washer
System, method and apparatus for pausing multi-channel broadcasts
Frequency offset estimation apparatus and method of OFDM system
Non-aqueous solution process for the preparation of cross-linked polymers
  Randomly Featured Patents
Aqueous formaldehyde-free composition and fiberglass insulation including the same
Automatic phonographs
Hydrocracking process
N-pyrazole A.sub.2A receptor agonists
Mass spectrometers
Device for injecting a fluid into a receptacle
Pneumatic sit/stand assistance device having improved stabilization features
Method and apparatus for controlling the overrun mode of operation of an internal combustion engine
Direct current to alternating current electronic inverter with overload and short-circuit protection circuitry
Catalyst modifiers and their use in the polymerization of olefin(s)