Crankcase breech detection for boosted engines

a technology for boosted engines and crankcases, which is applied in the direction of combustion engines, condensed fuel collection/return, feed systems, etc., can solve the problems of significant engine damage, unacceptable loss of engine lubricant, etc., and achieve enhanced air/lubricant, prolonging the duty cycle, and increasing the effect of blowing

Inactive Publication Date: 2010-06-17
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0002]Relative to a naturally aspirated engine of similar output power, a turbocharged or supercharged engine may exhibit a prolonged duty cycle and increased blow-by (i.e., pressurized combustion gas entering the crankcase via the piston rings). Therefore, specialized engine components and / or configurations may be provided for proper maintenance of the engine lubricant. For example, a positive crankcase ventilation (PCV) system of a turbocharged or supercharged engine may include one or more enhanced air / lubricant separators to limit loss of engine lubricant to the intake during high-load operation.

Problems solved by technology

In some cases, an unacceptable loss of engine lubricant may occur in just a few hours of high-load operation when a dipstick is left unseated.
If the loss of engine lubricant goes undetected, significant engine damage may result.

Method used

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  • Crankcase breech detection for boosted engines
  • Crankcase breech detection for boosted engines
  • Crankcase breech detection for boosted engines

Examples

Experimental program
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Embodiment Construction

[0011]FIG. 1 shows example engine 10 in schematic detail. The drawing schematically shows a V-type engine, but other configurations are contemplated as well. The engine includes crankcase 12, which contains crankcase head gas and engine lubricant. In some embodiments, the crankcase may include one or more access ports for checking and / or correcting the level of the engine lubricant. FIG. 1 shows access port 14, which is isolated from the atmosphere via closure 16. The closure may be a cap, e.g., a screw cap or snap cap. In some embodiments, the closure may include a dipstick for checking the level of the engine lubricant. In these and other embodiments, the closure may include a pressure-relief valve configured to discharge crankcase head gas to the atmosphere when the pressure of the crankcase head gas exceeds a threshold.

[0012]FIG. 1 shows cylinder 18 coupled to intake valve 20 and to exhaust valve 22; both valves are disposed below right valve cover 24. Internal lubricant separat...

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Abstract

Methods for indicating whether a crankcase of an engine is breeched are provided. One example method comprises restricting a communication of the crankcase with atmosphere, acting to increase or decrease a crankcase pressure, and indicating whether the crankcase is breeched based on the crankcase pressure. Another example method comprises sensing a crankcase pressure component, and indicating whether the crankcase is breeched based on the crankcase pressure component, the crankcase communicating with atmosphere via a conduit, a restrictedness of the conduit responsive to one or more of a crankcase pressure and a signal from an electronic control unit of the motor vehicle. Still other examples provide more particular methods for indicating whether the crankcase is breeched, and example configurations that enable the various methods.

Description

TECHNICAL FIELD[0001]The present application relates to the field of motor-vehicle engine systems and more particularly to maintenance of engine lubricant in turbocharged or supercharged motor-vehicle engine systems.BACKGROUND AND SUMMARY [0002]Relative to a naturally aspirated engine of similar output power, a turbocharged or supercharged engine may exhibit a prolonged duty cycle and increased blow-by (i.e., pressurized combustion gas entering the crankcase via the piston rings). Therefore, specialized engine components and / or configurations may be provided for proper maintenance of the engine lubricant. For example, a positive crankcase ventilation (PCV) system of a turbocharged or supercharged engine may include one or more enhanced air / lubricant separators to limit loss of engine lubricant to the intake during high-load operation.[0003]The prolonged duty cycle and increased blow-by in a turbocharged or supercharged engine may cause engine lubricant to aspirated rapidly through a...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01M13/00
CPCF01M1/16F01M1/18F01M13/00F01M2013/0038F01M2013/0077F01M13/028F01M13/0011F02B33/00F01M2013/0083
Inventor PURSIFULL, ROSS DYKSTRAULREY, JOSEPH NORMAN
Owner FORD GLOBAL TECH LLC
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