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(12) Patent Application Publication (10) Pub. No.: US 2010/0180875 A1 Meldolesi Et Al

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(12) Patent Application Publication (10) Pub. No.: US 2010/0180875 A1 Meldolesi Et Al US 20100180875A1 (19) United States (12) Patent Application Publication (10) Pub. No.: US 2010/0180875 A1 Meldolesi et al. (43) Pub. Date: Jul. 22, 2010 (54) SEATING CONTROL DEVICE FOR A VALVE Publication Classification FOR A SPLTCYCLE ENGINE (51) Int. C. (75) Inventors: Riccardo Meldolesi, Brighton FO2B 33/22 (2006.01) (GB); Stephen Peter Scuderi, FI6K 25/00 (2006.01) Westfield, MA (US) (52) U.S. Cl. ....................................... 123/70 Rs 251/175 Correspondence Address: (57) ABSTRACT EDWARDS ANGELL PALMER & DODGE LLP A seating control device for a valve, comprising: P.O. BOX SS874 a vessel for containing a fluid; BOSTON, MA 02205 (US) an upper snubber element translatably receivable in the (73) Assignee: The Scuderi Group, LLC, West vessel for controlling the seating Velocity of a valve Springfield, MA (US) associated therewith; and a lower snubber element translatably receivable in the ves (21) Appl. No.: 12/321,640 sel, adjacent the upper Snubber element, presenting a surface to the upper snubber element, for controlling the (22) Filed: Jan. 22, 2009 seating of the valve. 62 Patent Application Publication Jul. 22, 2010 Sheet 1 of 13 US 2010/0180875 A1 FIG. 1 Prior Art 18 ° 22 28 2632/ 4. A%214 NR tRNILE N 2 74 % 12 P % 14 Tin - O % |RLNji Patent Application Publication Jul. 22, 2010 Sheet 2 of 13 US 2010/0180875 A1 FIG. 2 Prior Art Valve Lift 45 42 Crank Angle (deg) 43 FIG. 3 Prior Art LO O N 2No. 2NN N Nº 3 3 2\, 3. 22 2% % YERNAL7 ANNau Air H-. 12 release exce Hern --- - Co % ( , r16 Patent Application Publication Jul. 22, 2010 Sheet 5 of 13 US 2010/0180875 A1 FIG. 5A 2. 2. t N A 6 4 61 6 Patent Application Publication Jul. 22, 2010 Sheet 6 of 13 US 2010/0180875 A1 FIG. 5B 108 N\! </È |Z Rae Jul. 22, 2010 Sheet 7 of 13 US 2010/0180875 A1 N <!"| 2 No.?“NNS``SSN Èí Patent Application Publication Jul. 22, 2010 Sheet 8 of 13 US 2010/0180875 A1 FIG. 7A 62 60 -200 205 203 LA 2O6 270 272 3 S1-276 / 286/.285 a N25fe (SX 1283 / 2 8 2 2 O 2 2 8 1 N 2 8 4. | Patent Application Publication Jul. 22, 2010 Sheet 9 of 13 US 2010/0180875 A1 N 22 Ut N N N" 7A/777 WZZ Patent Application Publication Jul. 22, 2010 Sheet 10 Of 13 US 2010/0180875 A1 FIG. 8 *N 93 (5dºco oro3\No.335 6 NJ 2O atent Application Publication Jul. 22, 2010 Sheet 11 of 13 US 2010/0180875 A1 Patent Application Publication Jul. 22, 2010 Sheet 12 of 13 US 2010/0180875 A1 - Upper Snubber element motion FIG. 10 ---- ge. Snubber element motion-nominal gap Angle (deg) Patent Application Publication Jul. 22, 2010 Sheet 13 of 13 US 2010/0180875 A1 FIG. 11 - LowerUpper Snubber element motionmotion-nominal gap Lower Snubber element motion-initially Smaller gap ress.css. Lower Snubber element motion-initially larger gap Angle (deg) 516 532 536 US 2010/01 80875 A1 Jul. 22, 2010 SEATING CONTROL DEVICE FOR A VALVE ing inward into the cylinder) poppet intake valve 18. During FOR A SPLT-CYCLE ENGINE the compression stroke, the compression piston 20 pressur izes the air charge and drives the air charge through the TECHNICAL FIELD crossoverpassage 22, which acts as the intake passage for the 0001. The present invention relates to a seating control expansion cylinder 14. device for a valve. More specifically, the present invention 0012. Due to very high volumetric compression ratios relates to a seating control device for a valve of camless (e.g., 40 to 1, 80 to 1 or greater) within the compression split-cycle engines. cylinder 12, an outwardly opening (opening outward away from the cylinder) poppet crossover compression (XoVrC) BACKGROUND OF THE INVENTION valve 24 at the crossover passage inlet is used to control flow 0002 For purposes of clarity, the term “conventional from the compression cylinder 12 into the crossover passage engine' as used in the present application refers to an internal 22. Due to very high Volumetric compression ratios (e.g., 40 combustion engine wherein all four strokes of the well known to 1, 80 to 1 or greater) within the expansion cylinder 14, an Otto or diesel cycle (the intake, compression, expansion and outwardly opening poppet crossover expansion (XoVrE) exhaust strokes) are contained in each piston/cylinder com valve 26 at the outlet of the crossoverpassage 22 controls flow bination of the engine. Each stroke requires one half revolu from the crossover passage 22 into the expansion cylinder 14. tion of the crankshaft (180 degrees crank angle (CA)), and The actuation rates and phasing of the XovrC and XovrE two full revolutions of the crankshaft (720 degrees CA) are valves 24, 26 are timed to maintain pressure in the crossover required to complete the entire Otto cycle in each cylinder of passage 22 at a high minimum pressure (typically 20 bar or a conventional engine. higher) during all four strokes of the Otto cycle. 0003. Also, for purposes of clarity, the following defini 0013. A fuel injector 28 injects fuel into the pressurized air tion is offered for the term “split-cycle engine' as may be at the exit end of the crossover passage 22 in correspondence applied to engines disclosed in the prior art and as referred to with the XovrE valve 26 opening. The fuel-air charge fully in the present application. enters the expansion cylinder 14 shortly after expansion pis 0004. A split-cycle engine comprises: ton 30 reaches its top dead center position. As piston 30 0005 a crankshaft rotatable about a crankshaft axis; begins its descent from its top dead center position, and while 0006 a compression piston slidably received within a compression cylinder and operatively connected to the crank the XovrE valve 26 is still open, spark plug 32 is fired to shaft Such that the compression piston reciprocates through initiate combustion (typically between 10 to 20 degrees CA an intake stroke and a compression stroke during a single after top dead center of the expansion piston 30). The XovrE rotation of the crankshaft; valve 26 is then closed before the resulting combustion event 0007 an expansion (power) piston slidably received can enter the crossover passage 22. The combustion event within an expansion cylinder and operatively connected to the drives the expansion piston 30 downward in a power stroke. crankshaft Such that the expansion piston reciprocates Exhaust gases are pumped out of the expansion cylinder 14 through an expansion stroke and an exhaust stroke during a through inwardly opening poppet exhaust valve 34 during the single rotation of the crankshaft; and exhaust stroke. 0008 a crossover passage interconnecting the compres 0014 With the split-cycle engine concept, the geometric sion and expansion cylinders, the crossover passage includ engine parameters (i.e., bore, stroke, connecting rod length, ing a crossover compression (XoVrC) valve and a crossover compression ratio, etc.) of the compression and expansion expansion (XoVrE) valve defining a pressure chamber ther cylinders are generally independent from one another. For ebetween. example, the crank throws 36, 38 for the compression cylin 0009 U.S. Pat. No. 6.543.225 granted Apr. 8, 2003 to der 12 and expansion cylinder 14 respectively may have dif Carmelo J. Scuderi (the Scuderi patent) and U.S. Pat. No. ferent radii and may be phased apart from one another with 6,952,923 granted Oct. 11, 2005 to David P. Branyon et al. top dead center (TDC) of the expansion piston 30 occurring (the Branyon patent) each contain an extensive discussion of prior to TDC of the compression piston 20. This indepen split-cycle and similar type engines. In addition the Scuderi dence enables the split-cycle engine to potentially achieve and Branyon patents disclose details of prior versions of higher efficiency levels and greater torques than typical four engines of which the present invention comprises a further stroke engines. development. 0015 The actuation mechanisms (not shown) for cross 0010 Referring to FIG. 1, a prior art split-cycle engine of over valves 24, 26 may be cam driven or camless. In general, the type similar to those described in the Branyon and Scuderi a cam driven mechanism includes a camshaft mechanically patents is shown generally by numeral 10. The split-cycle linked to the crankshaft. A cam is mounted to the camshaft, engine 10 replaces two adjacent cylinders of a conventional and has a contoured surface that controls the profile of the engine with a combination of one compression cylinder 12 valve lift (i.e. the valve lift from its valve seat, versus rotation and one expansion cylinder 14. The four strokes of the Otto of the crankshaft). A cam driven actuation mechanism is cycle are “split' over the two cylinders 12 and 14 such that the efficient and fast, but has limited flexibility. compression cylinder 12 contains the intake and compression 0016. Also in general, camless actuation systems are strokes and the expansion cylinder 14 contains the expansion known, and include systems that have one or more combina and exhaust strokes. The Otto cycle is therefore completed in tions of mechanical, hydraulic, pneumatic, and/or electrical these two cylinders 12, 14 once per crankshaft 16 revolution components or the like. Camless systems allow for greater (360 degrees CA). flexibility during operation, including, but not limited to, the 0011. During the intake stroke, intake air is drawn into the ability to change the valve lift height and duration and/or compression cylinder 12 through an inwardly opening (open deactivate the valve at selective times.
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