US 11,732,668 B1
Systems and methods for cylinder misfire detection
Chris Paul Glugla, Macomb, MI (US); Rani Kiwan, Canton, MI (US); and Robert Sarow Baskins, Grass Lake, MI (US)
Assigned to Ford Global Technologies, LLC, Dearborn, MI (US)
Filed by Ford Global Technologies, LLC, Dearborn, MI (US)
Filed on Feb. 9, 2022, as Appl. No. 17/650,431.
Int. Cl. F02D 41/22 (2006.01); F02B 75/22 (2006.01); F02D 41/00 (2006.01); G01M 15/11 (2006.01); G01M 15/10 (2006.01); F01N 13/10 (2010.01); F02B 75/18 (2006.01); F02D 41/14 (2006.01); F02D 41/28 (2006.01)
CPC F02D 41/22 (2013.01) [F01N 13/107 (2013.01); F02B 75/22 (2013.01); F02D 41/009 (2013.01); F02D 41/1443 (2013.01); F02D 41/1498 (2013.01); G01M 15/104 (2013.01); G01M 15/11 (2013.01); F02B 2075/1832 (2013.01); F02D 2041/288 (2013.01); F02D 2200/1015 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system for an engine, comprising:
a first cylinder and a second cylinder of a four-cylinder bank of the engine having exhaust flows combined together in an exhaust system of the engine before being combined with exhaust from a third cylinder and a fourth cylinder of the four-cylinder bank of the engine;
an exhaust gas sensor mounted in the exhaust system in a position to sense exhaust from the first cylinder and the second cylinder, and being positioned before exhaust from the third cylinder and the fourth cylinder is combined with the sensed exhaust from the first cylinder and the second cylinder, the exhaust from the third cylinder and the fourth cylinder combining with the combined exhaust from the first cylinder and the second cylinder in the exhaust system of the engine downstream of the exhaust gas sensor; and
a control system with memory and instructions stored in the memory to indicate detected misfire in one or more of the first cylinder and the second cylinder based on a magnitude of a frequency component of an output from the exhaust gas sensor at engine cycle frequency, and then, after indicating detected misfire, identify which cylinder is misfiring based on a phase of the frequency component of the output from the exhaust gas sensor at the engine cycle frequency.