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A method of testing the assembled state of an internal combustion engine and quickly and accurately judging whether there is at least one fault with the assembling of the engine. While an exhaust-valve side space is closed and a crank shaft is rotated at a constant speed, the pressure in the exhaust

A method of testing the assembled state of an internal combustion engine and quickly and accurately judging whether there is at least one fault with the assembling of the engine. While an exhaust-valve side space is closed and a crank shaft is rotated at a constant speed, the pressure in the exhaust-valve side space and the pressure in a surge tank are detected by pressure sensors, respectively. The assembled state of an engine is tested based on the predetermined conditions of the detected two pressures. Those predetermined conditions may be the crank-shaft angles when the two pressures take respective maximal values, the crank-shaft angles when the two pressures change from their constant states to their increasing or decreasing states, etc. Based on those values, incorrect phases of crank and cam pulleys, incorrect clearances of intake and exhaust valves, missing of a compression ring, etc. can be identified.

대표청구항 ▼

A method of testing the assembled state of an internal combustion engine and quickly and accurately judging whether there is at least one fault with the assembling of the engine. While an exhaust-valve side space is closed and a crank shaft is rotated at a constant speed, the pressure in the exhaust

A method of testing the assembled state of an internal combustion engine and quickly and accurately judging whether there is at least one fault with the assembling of the engine. While an exhaust-valve side space is closed and a crank shaft is rotated at a constant speed, the pressure in the exhaust-valve side space and the pressure in a surge tank are detected by pressure sensors, respectively. The assembled state of an engine is tested based on the predetermined conditions of the detected two pressures. Those predetermined conditions may be the crank-shaft angles when the two pressures take respective maximal values, the crank-shaft angles when the two pressures change from their constant states to their increasing or decreasing states, etc. Based on those values, incorrect phases of crank and cam pulleys, incorrect clearances of intake and exhaust valves, missing of a compression ring, etc. can be identified. perty of the fluid sample. 16. The apparatus of claim 14 wherein the plunger assembly is connected to one of the opposed surfaces and varies the vertical dimension of the sample site by axially moving the connected surface at a user-defined rate. 17. The apparatus of claim 14 wherein the plunger assembly comprises a motor driven cam and a spring. 18. An apparatus for measuring an extensional rheological property of a fluid, the apparatus comprising (a) opposed surfaces defining a sample site disposed therebetween and adapted for user-defined axial motion to vary the vertical dimension of the sample site. (b) a light source for directing a light beam at the sample site; (c) a light detector for sensing light passing through the sample site; and (d) a data analysis unit which converts data from the light detector to an extensional rheological property of the fluid sample. 19. A method for obtaining an extensional rheological property of a fluid sample comprising the steps of: (a) stretching the fluid sample to form a fluid filament at a user-defined rate; (b) measuring a time profile of a diameter of the fluid filament; and (c) analyzing the time profile of the diameter of the fluid filament to obtain an extensional rheological property of the fluid sample, wherein analyzing the time profile comprises converting the time profile to a curve of viscosity versus strain. 20. The method of claim 19 further comprising repeating the step of stretching the fluid sample to form a fluid filament multiple times at various speed and measuring time profile of a diameter of the fluid filament following each stretching step. 21. The method of claim 19 further comprising isolating the fluid sample with a housing prior to the stretching and measuring steps. 22. The method of claim 19 wherein the step of measuring time profile of a diameter of the fluid filament comprises directing a beam of light to a diameter of the fluid filament and detecting light transmitted therethrough. 23. The method of claim 22 wherein the beam of light is a beam of laser light. 24. The method of claim 23 wherein detecting light transmitted through the diameter of the fluid filament comprises detecting light transmitted through the diameter of the fluid filament with a laser micrometer. 25. A portable apparatus for measuring an extensional rheological property of a fluid, the portable apparatus comprising: a body portion comprising: opposed surfaces defining a sample site disposed therebetween and adapted for axial motion to vary the vertical dimension of the sample site; a housing about the sample site which permits specification of ambient conditions; a light source for directing a light beam at the sample site; and a light detector for sensing light passing through the sample site; and a handle portion in communication with the body portion, the handle portion having a data processing device. 26. The portable apparatus of claim 25 further comprising a plunger assembly for varying the vertical dimension of the sample site and for varying the rate of axial movement at a user-defined rate of at least one of the opposed surfaces. 27. The portable apparatus of claim 25 further comprising a data analysis unit which converts data from the light detector to an extensional rheological property of the fluid sample. 28. The portable apparatus of claim 26 further comprising a data analysis unit which converts data from the light detector to an extensional rheological property of the fluid sample. 29. The portable apparatus of claim 25 wherein the housing provides control of one or more of the temperature, the humidity, and the pressure at the sample site. 30. The portable apparatus of claim 25 wherein the light detector comprises a laser micrometer. 31. The portable apparatus of claim 30 wherein the light detector comprises a charge coupled device (CCD) camera. 32. The portable apparatus of claim 25 further comprising a sample loading device comprising a sleeve system to allow the measurement of a volatile fluid sample. 33. The portable apparatus of claim 32 wherein the sample loading device further comprises a syringe-type delivery device. 34. The portable apparatus of claim 33 wherein the syringe-type delivery device is one of manually driven, air-driven, and mechanically-activated. 35. The portable apparatus of claim 25 wherein at least one of the opposed surfaces is adapted for rotational motion. 36. The portable apparatus of claim 25 further comprising a force transducer in direct or indirect contact with at least one of the opposed surfaces. 37. The portable apparatus of claim 25 further comprising a heating system in thermal communication with the interior of the housing. 38. The portable apparatus of claim 26 wherein the plunger assembly comprises a motor driven cam and a spring. 39. The portable apparatus of claim 25 further comprising a connection to interface with an external data processing device. 40. A method for analyzing an extensional rheological property of a fluid, comprising the steps of: providing midpoint diameter measurements as a function of time of a fluid filament; fitting the midpoint diameter measurements as a function of time to a non-linear model to obtain an approximate value of an extensional parameter; extracting a rheological data parameter by fitting the approximate value to at least one of a plurality of appropriate models. 41. A computer readable medium having stored therein instructions for causing a central processing unit to execute the method of claim 40. 42. The method of claim 22 wherein the beam of laser light is modulated for at least one of wavelength and intensity. 43. The apparatus of claim 6 wherein at least one of resolution, response time and gain of the laser micrometer can be adjusted. 44. A method for measuring an extensional rheological property of a fluid, comprising: measuring time varying diameter data of a fluid filament; displaying effective extensional viscosity; and further processing the data to determine rheological parameters using a plurality of models, including a model comprising using the diameter data in a non-linear form of an equation having a linear term, an exponential term and an offset term. 45. The method of claim 44 wherein the plurality of models comprise at least one of a Newtonian model, and Maxwell model. 46. The method of claim 44 wherein the step of displaying further comprising displaying diameter and effective elongational viscosities. ociety Press, (1997). "IBM DB2 Intelligent Miner for Data" at Universal Resource Locator (URL) www.almaden.ibm.com/cs/quest at least as early as Oct. 5, 2000. "MineSet" at Universal Resource Locator (URL) www.sgi.com/software/mineset at least as early as Oct. 5, 2000. A. Bookstein, S.T. Klein, T. 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