Resources Contact Us Home
Exhaust gas recirculation system for internal combustion engine

Image Number 2 for United States Patent #4870941.

An automotive vehicle is equipped with an exhaust gas recirculation system in which a part of exhaust gas is recirculated back to the combustion chambers of the engine. The exhaust gas recirculation system is comprised of an EGR passage through which the exhaust gas flows. An EGR valve is disposed in the EGR passage to control the amount of the recirculated exhaust gas. A temperature sensor is disposed in the EGR passage upstream of the EGR valve to detect the temperature of the recirculated exhaust gas flowing through the EGR passage and output a signal representing the exhaust gas temperature. The signal is input to a control unit which is arranged to cause a warning lamp to light when the exhaust gas temperature detected by the temperature sensor is below a predetermined level, thus achieving diagnosis of abnormality in the exhaust gas recirculation system such as clogging of the EGR passage and failed operation of the EGR valve while preventing thermal damage of the temperature sensor.

  Recently Added Patents
Soybean cultivar CL1013675
Semiconductor memory device
System and method for a driver circuit with a referenced control signal
Associating objects in databases by rate-based tagging
Hand sign
Implantable neuro-stimulation electrode with fluid reservoir
Methods, systems, and computer program product for virtually modifying surface region curvature to detect protrusions
  Randomly Featured Patents
Method, system and computer program product for real-time detection of sensitivity decline in analyte sensors
Pultrusion method of manufacturing a composite structural component
Process for preparing 5H-pyrrolo[2,1-c]-[1,4]thiazepine-1,5-diones
Multi-level memory device using resistance material
Method of sealing a container
Faucet handle
Combined layout and icons for a computer screen
Closed system transient diesel fuel conditioning and measurement system
Biaxially oriented sealable polypropylene film having improved barrier properties
Wine barrel planter