About 26 results
https://drivepatents.com/patents/1004546 · 7 Mar 2012
This invention relates to a method for protecting an exhaust gas recirculation (EGR) valve from fouling due to hydrocarbon condensation at low EGR cooler outlet exhaust temperatures. In modem internal combustion engines exhaust gas recirculation (EGR) valv...
https://drivepatents.com/patents/1011388 · 29 Jun 2011
In order to improve a measurement accuracy of an EGR ratio and to downsize the device and to save labor, the EGR ratio measuring device comprises a pair of nondispersive infrared gas analyzers (11), (12) that have a function of correcting a water influence...
https://drivepatents.com/patents/1015131 · 9 Mar 2011
An EGR flow rate control apparatus of an internal combustion engine is provided that can correct with high accuracy an EGR gas flow rate measured by a gas flow rate measurement apparatus 18 in an EGR passage and control with high accuracy a gas flow rate r...
https://drivepatents.com/patents/1068561 · 5 Apr 2006
The invention relates to an exhaust recirculation control system of the internal combustion engine (1) computes an oxygen concentration in total intake air containing recirculation exhaust gas in a cylinder and the ratio between an oxygen quantity in the t...
https://drivepatents.com/patents/1071616 · 21 Dec 2005
A method and a device for controlling the exhaust gas recirculation in an internal-combustion engine (1) are described herein. The engine (1) is provided with an air-intake system (2), a gas-exhaust system (4), and an exhaust-gas-recirculation system (5). ...
https://drivepatents.com/patents/1077881 · 11 May 2005
A curved passage constituting part of an exhaust gas recirculation passage is installed inside a suction passage (46) in the downstream of an electronic control throttle valve (2), of which initial position is the fully opened position, and an exhaust gas ...
https://drivepatents.com/patents/1085580 · 21 Jul 2004
A combustion engine with an EGR apparatus has an EGR path 16 connecting an exhaust path 14 and an intake path 12. An EGR control valve 18 is mounted in the EGR path 16 for controlling the amount of flow of an EGR gas flowing from the exhaust path 14 to the...
https://drivepatents.com/patents/1086116 · 23 Jun 2004
In an internal combustion engine, at least one of the pressure and temperature in an intake passage (13) downstream of a throttle valve (18) is calculated using an expression of a relationship established based on the law of conservation of mass among an a...
https://drivepatents.com/patents/1087331 · 6 May 2004
An EGR-gas temperature estimation apparatus for an internal combustion engine which has an exhaust circulation pipe and an EGR-gas cooling apparatus. The estimation apparatus obtains the cooling efficiency ·egr of the EGR-gas cooling apparatus from the te...
https://drivepatents.com/patents/1087335 · 6 May 2004
A provisional EGR gas flow rate estimation unit estimates the flow rate of EGR gas passing through an EGR control valve based on the pressure of compressible fluid upstream and downstream of a throttle portion. An EGR gas flow rate estimation unit estimate...