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Pseudo CCV System

Pseudo CCV System

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Pseudo CCV System

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  1. Pseudo CCV System • System Diagram • Bracket Diagram • 50hr oil and carryover add procedure • Observations and Background

  2. Pseudo CCV System Diagram

  3. Pseudo CCV System Bracket Diagram

  4. 50 Hr Oil Add Procedure • Every 50hrs except 500th • Period End Weight is recorded just prior to each 50th hour for use in the usual Fill to Full calculation • Engine ramps down essentially using the usual 10min ramp down process (STAGE2, and 1) • Engine then idles for 15 minutes; just enough time for operators • During that time the vacuum is shut off for a minimum of 5 minutes in order to purge the CCV Filter Canister Drain Line

  5. 50 Hr Oil Add Procedure • Blowby Carryover from the CCV Filter Canister Drain Line is weighed and recorded • Fill to Full (5.5kg) oil add, calculated allowing for carryover weight, is then added to the Oil Weigh Bucket along with the blowby carryover • The vacuum is turned back on prior to ramp up • The engine ramps back up to rated power utilizing the usual warm up process (STAGES 2, 3, 4, and 5) • Idle: 600RPM, No load

  6. Observations and Background • The Fuel Temperature and Intake Manifold Temperature set points were changed in the two shutdown stages: Fuel Temp 35, 30 and also IMT 30, 25. • After shutting down the vacuum the line is purged very nicely without any mess • Upon reaching about 27” of carryover in the line the check valve begins a slow drip • A 1L beaker is being used as a container for the carryover for ease of use in returning the carryover to the oil weigh bucket • A stopper, “borrowed” from our chem lab, is being used to cover the beaker

  7. Observations and Background • Carryover is not included in Fill to Full calculation since it would not be measured separately if the drain line were going back to the pan; it will show itself after the first 50hr period • The CCV filter is weighed at the beginning and end of test • The vacuum has currently sustained +/- 0.7kPa; currently +/- 1.0 is being used as a safety until more data is acquired • Pressure depression is not currently being “controlled”; an engine in the field would not be measuring nor controlling to a set pressure • Target 6.8 kPa negative pressure down stream of CCV filter canister