US 12,031,496 B2
Method and device for diagnosing an internal combustion engine of a powertrain
Stefan Schroth, Wörth (DE); and Heiko Herzig, Tegernheim (DE)
Assigned to Vitesco Technologies GmbH, Regensburg (DE)
Filed by Vitesco Technologies GmbH, Regensburg (DE)
Filed on Sep. 18, 2023, as Appl. No. 18/468,842.
Application 18/468,842 is a continuation of application No. PCT/EP2021/086829, filed on Dec. 20, 2021.
Claims priority of application No. 10 2021 202 655.9 (DE), filed on Mar. 18, 2021.
Prior Publication US 2024/0003311 A1, Jan. 4, 2024
Int. Cl. F02D 41/22 (2006.01); F02D 41/00 (2006.01); F02D 41/02 (2006.01)
CPC F02D 41/222 (2013.01) [F02D 41/008 (2013.01); F02D 41/0225 (2013.01); F02D 2200/50 (2013.01); F02D 2250/14 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for diagnosing an internal combustion engine of a powertrain, the powertrain includes the internal combustion engine and a transmission unit, the diagnosis is carried out using a running irregularity signal, the method comprising:
ascertaining a diagnostic value of the internal combustion engine during operation using the running irregularity signal of the internal combustion engine, wherein the powertrain is operated using a diagnostic gear of the transmission unit;
detecting the diagnostic gear which is engaged in the transmission unit while ascertaining the diagnostic value; and
comparing the ascertained diagnostic value with a predefined diagnostic threshold value and comparing the diagnostic gear of the transmission unit with at least one predefined gear of the transmission unit;
identifying that the diagnosis of the internal combustion engine is reliable and there is a fault of the internal combustion engine if the ascertained diagnostic value exceeds the predefined diagnostic threshold value and at the same time the diagnostic gear of the transmission unit differs from all of the predefined gears of the transmission unit, or
identifying that the diagnosis of the internal combustion engine is unreliable if the ascertained diagnostic value exceeds the predefined diagnostic threshold value and at the same time the diagnostic gear of the transmission unit corresponds to one of the predefined gears of the transmission unit.