Method and device for diagnosing the ventilation in crankcase of internal combustion engine
A technology for crankcase ventilation and internal combustion engine, which is applied in the functional field of diagnosing crankcase ventilation, and can solve problems such as leakage, pressure increase, leakage of squeezed oil dipstick, etc.
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[0034] figure 1 The schematic diagram shows the engine system 1 . An internal combustion engine 2 with cylinders 4 and a crankcase 3 is shown in the engine system. For the sake of clarity, internal combustion engine 2 is shown with only one cylinder 4 . Air cylinders 4 are supplied with air via an air system 5 . Air enters the corresponding cylinder 4 via the intake valve 6 . Combustion exhaust gases can be discharged from the cylinders 4 into an exhaust manifold 8 via an exhaust valve 7 . An excess air ratio probe 9 is provided in the exhaust manifold 8 to detect the mixture composition of the burned air-fuel mixture and provide data on the excess air ratio value. Fuel is supplied to the cylinders 4 either directly or indirectly via the air system 5 .
[0035] The air system 5 includes an intake pipe 10 and a throttle valve 11 for adjusting the intake air volume of the cylinder 4 . The intake pipe 10 is provided between the throttle valve 11 and the intake valve 6 . Fu...
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