US 12,435,656 B2
Method and device for diagnosing an air supply of an internal combustion engine
Benedikt Graf, Ludwigsburg (DE); Christian Disch, Wimsheim (DE); Conrad Bubeck, Esslingen (DE); Markus Deissler, Heilbronn (DE); and Stefan Bauer, Gerlingen (DE)
Assigned to ROBERT BOSCH GMBH, Stuttgart (DE)
Filed by Robert Bosch GmbH, Stuttgart (DE)
Filed on Dec. 12, 2023, as Appl. No. 18/536,366.
Claims priority of application No. 10 2022 213 543.1 (DE), filed on Dec. 13, 2022.
Prior Publication US 2024/0191646 A1, Jun. 13, 2024
Int. Cl. F01N 11/00 (2006.01); F01N 3/22 (2006.01); F01N 9/00 (2006.01)
CPC F01N 11/002 (2013.01) [F01N 3/225 (2013.01); F01N 9/00 (2013.01); F01N 2560/06 (2013.01); F01N 2900/1804 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method of an internal combustion engine system for diagnosing an air supply of an internal combustion engine of the system, the internal combustion engine including a first air duct configured to supply air to a cylinder of the internal combustion engine, and a second air duct configured to supply air to a heater for heating an exhaust gas system of the internal combustion engine, wherein the first air duct has a first mass flow sensor configured to measure a mass of air flowing through the first air duct, the second air duct has a second mass flow sensor configured to measure a mass of air flowing through the second air duct, a first pressure sensor configured to measure a pressure in the first air duct, a second pressure sensor configured to measure a pressure in the second air duct, a first temperature sensor configured to measure a temperature of the air flowing through the first air duct, and a second temperature sensor configured to measure a temperature of the air flowing through the second air duct, wherein the first and the second air ducts originate from a common air filter, the method comprising:
operating, by the internal combustion engine, such that the cylinder and the heater of the internal combustion engine transition into one or more predefined operating states;
monitoring, by a processor of the system, a current state of the cylinder and the heater;
performing, by the processor, a comparison of at least a subset of measurement values of the first and second mass flow sensors, the first and second pressure sensors, and the first and second temperature sensors of the first and second ducts with one another or with predefined comparison values, wherein which of a plurality of predefined comparisons is performed as the comparison depends on to which of the one or more predefined operating states of the cylinder and of the heater the monitoring indicates the current state corresponds; and
ascertaining a result of the diagnosis depending on the comparison.