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
Debris tray
System for determining potential lot consolidation during manufacturing
Surfcraft fin
Domain isolation through virtual network machines
Method of and apparatus for laser drilling holes with improved taper
Network based JIT on a priori knowledge of a set of disparate clients
Method and system for a low-power client in a wide area network
  Randomly Featured Patents
Localized vacuum processing apparatus
Rapidly convertible hybrid aircraft and manufacturing method
Method for enabling a compiler or interpreter to use identifiers found at run time in a map container object in a manner similar or identical to identifiers declared at compile time
Detent escapement for timepiece and mechanical timepiece
System and method for organizing data stored in a log structured array
Hand held periodontic tool
Shift control system of automatic transmission for vehicle
Injection library
Light absorbing dye for photography
Blender control apparatus and method