Patent · US Active

Method and device for diagnosing crankcase ventilation of internal combustion engines

US8887559B2 · kind B2 · utility

9Cited by

11References

8Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Daniel Kuhn · Düsseldorf, DE
Stefan Michael · Markgröningen, DE

Key dates

Filing date	Sep 7, 2011
Grant date	Nov 18, 2014
Priority date	—
Expiry date	Sep 13, 2031

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/40
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A method for checking the functioning of a ventilation apparatus for ventilating a crankcase connected via the ventilation apparatus to an air supply system of the internal combustion engine includes: determining a pressure difference between an ambient pressure and a crankcase pressure in the crankcase; identifying a fault in the ventilating apparatus as a function of the pressure difference if an enabling condition is met; the enabling condition being met if an air mass flow in the air supply system, filtered by a low-pass filter, exceeds a first threshold value in terms of absolute value.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.