US 12,442,321 B2
Method and device for diagnosing a leakage of a crankcase ventilation line of a crankcase ventilation device for an internal combustion engine
Gerhard Haft, Maxhütte-Haidhof (DE); Carsten Bruns, Regensburg (DE); Thomas Czarnecki, Sinsheim (DE); and Karl Gruenbeck, Kelheim (DE)
Assigned to Vitesco Technologies GmbH, Regensburg (DE)
Filed by Vitesco Technologies GmbH, Regensburg (DE)
Filed on Feb. 15, 2022, as Appl. No. 17/651,142.
Application 17/651,142 is a continuation of application No. PCT/EP2020/073064, filed on Aug. 18, 2020.
Claims priority of application No. 10 2019 212 457.7 (DE), filed on Aug. 21, 2019.
Prior Publication US 2022/0170396 A1, Jun. 2, 2022
Int. Cl. F01M 13/02 (2006.01); F01M 13/04 (2006.01); F02D 41/22 (2006.01)
CPC F01M 13/022 (2013.01) [F01M 13/04 (2013.01); F02D 41/22 (2013.01); F01M 2013/027 (2013.01); F02D 2250/08 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for leakage diagnosis of a crankcase ventilation line of a crankcase ventilation device for an internal combustion engine, the method comprises:
influencing the introduction of gas along a crankcase aeration line into a crankcase of the internal combustion engine;
acquiring a measurement signal profile by an exhaust-gas sensor arranged in an exhaust-gas tract of the internal combustion engine, the measurement signal profile is characteristic of at least one exhaust-gas property of the exhaust gas in the exhaust-gas tract, the exhaust-gas property influenced by the influencing of the introduction of gas into the crankcase;
providing an expected measurement signal profile characteristic of the exhaust-gas property of the exhaust gas in the exhaust-gas tract based on the influence of the introduction of gas into the crankcase;
comparing the acquired measurement signal profile with the expected measurement signal profile; and
identifying a leak in the crankcase ventilation line when, based on the comparison, the acquired measurement signal profile deviates from the expected measurement signal profile by at least a predetermined threshold value, the crankcase ventilation line discharging gases from the crankcase into the intake tract of the internal combustion engine,
wherein the internal combustion engine has a tank ventilation device which is fluidically connected to the crankcase aeration line by a tank ventilation valve, wherein gases are introduced from the tank ventilation device by the tank ventilation valve for the influencing of the introduction of gas into the crankcase, or
wherein the internal combustion engine has an exhaust-gas recirculation device which is fluidically connected to the crankcase aeration line by an exhaust-gas recirculation valve, wherein gases are introduced from the exhaust-gas recirculation device into the crankcase by the exhaust-gas recirculation valve for the influencing of the introduction of gas into the crankcase.