Method of engine oil consumption

• US 7,793,537 B2
• Filed: 09/10/2008
• Issued: 09/14/2010
• Est. Priority Date: 09/10/2008
• Status: Expired due to Fees

• Current Assignee: Detroit Diesel Corporation (Mercedes-Benz Group AG)
• Original Assignee: Detroit Diesel Corporation (Mercedes-Benz Group AG)
• Inventors: Rochon, Michael Kennedy, Benz, Frank-Michael, Barton, Jason Thomas
• Primary Examiner(s): Caputo; Lisa M
• Assistant Examiner(s): Kirkland, III; Freddie
• Application Number:
  US12/208,051
• Publication Number:
  US 20100058847A1
• Time in Patent Office: 734 Days
• Field of Search: 73/233.1, 731/145.5
• US Class Current: 73/114.55
• CPC Class Codes: F01M 1/16 Controlling lubricant pressure or quantity rendering machines or engines inoperative or idling on lubricant pressure failure F01M1/22
• CPC Class Codes: F01M 1/18 Indicating or safety devices concerning lubricant level F01M11/06, F01M11/12

Abstract

The disclosure is directed to a method to determine oil consumption in an internal combustion engine that does not require extended operation of the engine in the files and is adaptable to be useful at production facilities for testing of sample engines from the line without installation of the engine into a vehicle and operating the vehicle in order to determine oil consumption of the engine during operating conditions.

Claims

1. A method to determine engine oil consumption in an internal combustion engine having a fuel system, a cooling system, at least one piston reciprocally moveable within a piston bore, an oil reservoir in fluid communication with said bore and at least one expandable oil ring circumferentially disposed on said piston, and an exhaust system having an inlet in fluid communication with an engine exhaust manifold, and an outlet to exhaust from said engine,

fueling the engine during operation for a predetermined period of time to bring the engine oil and coolant temperature to a whole boundary predetermined temperature for a predetermined period of time;

ceasing fueling once engine has reached whole boundary condition;

motoring the engine on a dynamometer to turn crankshaft at a predetermined range of rpm;

measuring hydrocarbon levels at said exhaust outlet for a predetermined period of time to determine engine oil consumption.

2. The method of claim 1, wherein said engine whole boundary conditions are reached when the coolant and oil temperature are at a predetermined level.

3. The method of claim 1, wherein whole boundary conditions are determined using ambient temperature;

Δ

pressure of CAC, and exhaust gas pressure are at predetermined levels for a predetermined period of time.

4. The method of claim 1, wherein said coolant predetermined temperature is about 80°

C.

5. The method of claim 1, further including motoring said engine with a dynamometer to range of about 1800 rpm.

6. The method of claim 1, further including motoring said engine with a dynamometer to a range of about 2200 rpm.

7. The method of claim 1, further including motoring said engine with a dynamometer at a range of about 2500 rpm.

8. The method of claim 1, wherein said hydrocarbon level is measured in said exhaust for about 5-6 minutes.