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
Imidazole-5-carboxylic acid derivatives, the preparation method therefor and the uses thereof
All-in-one information handling system
Method and system for weighted fair queuing
Method and system for automatically identifying wireless signal quality of a region
Method for increasing expression of active tumor necrosis factor receptor family member-Ig fusion proteins
Weak acid recovery system for ethanol separation processes
  Randomly Featured Patents
Top portion of fishing reel
Organic silicon compound and method for preparing the same
Method and apparatus for demagnetizing a borehole
Identification and verification of a sector within a block of mass storage flash memory
Thin film transistor for liquid crystal display
Method of making a bullet-resistant transparent panel
Driving method and driving device for motor
Toy contruction piece set
Semiconductor memory device having reduced power consumption during latency
On-chip probing apparatus