About 21 results
https://drivepatents.com/patents/948000 · 2 Dec 2015
A system and method of detecting fueling imbalance(s) in an internal combustion engine is provided. The method includes receiving data regarding an oxygen content of engine exhaust for the engine operating at a cycle rate. Frequency component analysis is p...
https://drivepatents.com/patents/955279 · 25 Nov 2015
It is possible to prevent the stability of an engine from deteriorating even when degrees of changes over time of injection characteristics are different in each fuel injection valve. An inter-cylinder air-fuel ratio variation detection unit 1100 calculate...
https://drivepatents.com/patents/991871 · 10 Apr 2013
A fuel injection amount control apparatus (control apparatus) according to the present invention comprises an air-fuel ratio sensor 67 which is disposed between the exhaust gas merging portion HK and the upstream catalyst 53. The control apparatus performs...
https://drivepatents.com/patents/996376 · 31 Oct 2012
The consecutive pressure values of pressure tube (14) are acquired before fuel injection into cylinder for all cylinders (2-5). The consecutive pressure values of pressure tubes after the injection of fuel into cylinder are acquired for each cylinder. The ...
https://drivepatents.com/patents/996819 · 24 Oct 2012
An inter-cylinder air-fuel ratio imbalance determination apparatus (determination apparatus) according to the present invention obtains, based on an output value Vabyfs of an air-fuel ratio sensor 67, an air-fuel ratio fluctuation indicating amount AFD whi...
https://drivepatents.com/patents/1002566 · 9 May 2012
An air-fuel ratio imbalance among cylinders determining apparatus according to the present invention comprises an air-fuel ratio sensor having a protective cover and an air-fuel ratio detection element accommodated in the protective cover, and imbalance de...
https://drivepatents.com/patents/1007205 · 14 Dec 2011
An apparatus for determining an air-fuel ratio imbalance among cylinders according to the present invention comprises "an upstream air-fuel ratio sensor 67, a catalytic converter 53, and a downstream air-fuel ratio sensor 68" disposed at positions downstre...
https://drivepatents.com/patents/1007411 · 7 Dec 2011
A monitoring apparatus comprises a catalytic converter 43, an upstream air-fuel ratio sensor 55, and a downstream air-fuel ratio sensor 56; calculates a sub feedback amount to have an air-fuel ratio represented based on an output value of the downstream ai...
https://drivepatents.com/patents/1009941 · 24 Aug 2011
A determining apparatus comprises a catalytic converter 43, an upstream air-fuel ratio sensor 55 including an air-fuel ratio detecting element covered by a diffusion resistance layer, and a downstream air-fuel ratio sensor 56. The determining apparatus per...
https://drivepatents.com/patents/1010310 · 10 Aug 2011
To prevent the deterioration of exhaust emissions of an internal combustion engine due to air-fuel ratio variation among multiple cylinders, and to identify an abnormal cylinder during an abnormality of cylinder air-fuel ratio variation. An control apparat...