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Class Information
Number: 123/68
Name: Internal-combustion engines > Two-cycle > Pump compression
Description: Two-cycle internal-combustion engines in which the combustible mixture, or both the constituents thereof, is supplied to the working cylinder under pressure materially greater than atmospheric pressure, such supply beginning at the beginning of the working stroke and continuing for a determinate portion thereof, the combustible mixture being ignited either at constant pressure as it enters the cylinder or at constant volume after the whole charge has been supplied thereto, in either case without recompression in the working cylinder. The combustible mixture or the constituents thereof may be supplied directly to the working cylinder without preliminary storage or may be supplied to suitable reservoirs interposed between the compressing means and the working cylinder and within which a considerable volume of combustible mixture, or its constituents, is stored. Engines in this subclass in which ignition takes place after the whole charge has been supplied to the working cylinder differ from those in ... which work upon a two-stroke cycle, only in the degree of compression to which the charge is subjected before ignition, and as some of the engines in the subclass above mentioned are provided with a supply-pump for forcing air through a charge-forming device to the cylinder of the engine the combustible mixture thus produced is necessarily supplied to such engines under some pressure. However, where the structure and operation of the device as a whole clearly indicate that the pressure under which the charge is supplied is so slight as to be sufficient only to insure its flow into the working cylinder the engine is classified in subclass 39. In engines working on the two-cycle pump-compression cycle the whole charge properly mixed to form a combustible mixture may be compressed by a single pump or the air and combustible may be compressed by separate pumps to be mixed on their way to the working cylinder or after such constituents have entered thereinto.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8689745 Split-cycle air-hybrid engine having a threshold minimum tank pressure Apr. 8, 2014
8683984 Thermocompression motor Apr. 1, 2014
8677953 Split-cycle air-hybrid engine with air expander and firing mode Mar. 25, 2014
8505504 Two-stroke engine and related methods Aug. 13, 2013
8479514 Method and device for generating compressed air and for blowing it into an internal combustion engine Jul. 9, 2013
8443788 Internal combustion engine May. 21, 2013
8360017 Part-load control in a split-cycle engine Jan. 29, 2013
8267056 Split-cycle internal combustion engine Sep. 18, 2012
8256227 Ultra efficient engine Sep. 4, 2012
8215292 Internal combustion engine and working cycle Jul. 10, 2012
8210138 Split-cycle engine with pilot crossover valve Jul. 3, 2012
8151747 Crescent-shaped recess in piston of a split-cycle engine Apr. 10, 2012
8028665 Selective compound engine Oct. 4, 2011
8006656 Split-cycle four-stroke engine Aug. 30, 2011
7975667 Crankshaft-free drive shaft and piston assembly of a split-cycle four-stroke engine Jul. 12, 2011
7954463 Split-cycle four-stroke engine Jun. 7, 2011
7954462 Split-cycle air hybrid engine Jun. 7, 2011
7954461 Split-cycle four-stroke engine Jun. 7, 2011
7950357 Method for operating an internal combustion engine and an internal combustion engine May. 31, 2011
7942117 Engine May. 17, 2011
7905204 Internal combustion engine and method with improved combustion chamber Mar. 15, 2011
7757644 Internal combustion engine and method with improved combustion chamber Jul. 20, 2010
7748351 Internal combustion engine and method with improved combustion chamber Jul. 6, 2010
7748352 Internal combustion engine and method with improved combustion chamber Jul. 6, 2010
7690337 Spark plug location for split-cycle engine Apr. 6, 2010
7658169 Internal combustion engine and method with improved combustion chamber Feb. 9, 2010
7603970 Split-cycle air hybrid engine Oct. 20, 2009
7571699 System and method for split-cycle engine waste heat recovery Aug. 11, 2009
7481190 Split-cycle engine with disc valve Jan. 27, 2009
7467608 Air injection engine Dec. 23, 2008
7464675 Operating an air-hybrid vehicle with camshaft-driven engine valves Dec. 16, 2008
7389755 Tandem-piston engine Jun. 24, 2008
7353786 Split-cycle air hybrid engine Apr. 8, 2008
7140182 Energy storing engine Nov. 28, 2006
7007639 Air injection engine Mar. 7, 2006
6655327 Combustion method for an internal combustion engine Dec. 2, 2003
6546901 Two cycle internal combustion engine Apr. 15, 2003
5857436 Internal combustion engine and method for generating power Jan. 12, 1999
5755191 Two-stroke internal combustion engine with charging cylinder May. 26, 1998
5694891 Internal combustion engine Dec. 9, 1997
5638681 Piston internal-combustion engine Jun. 17, 1997
5615644 Valve arrangement in an internal combustion engine Apr. 1, 1997
5341774 Self supercharged two stroked cycle and engine having migrating combustion chambers Aug. 30, 1994
5103645 Internal combustion engine and method Apr. 14, 1992
4748811 Supercharged diesel type apparatus for the generation of power Jun. 7, 1988
4635590 Internal combustion engine and operating cycle therefor Jan. 13, 1987
4592309 Internal combustion engine Jun. 3, 1986
4520765 Internal combustion engine and operating cycle therefor Jun. 4, 1985
4506634 Internal combustion engine Mar. 26, 1985
4489558 Compound internal combustion engine and method for its use Dec. 25, 1984

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