GB2292586A - Scavenging four-stroke engines - Google Patents

Scavenging four-stroke engines Download PDF

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Publication number
GB2292586A
GB2292586A GB9417154A GB9417154A GB2292586A GB 2292586 A GB2292586 A GB 2292586A GB 9417154 A GB9417154 A GB 9417154A GB 9417154 A GB9417154 A GB 9417154A GB 2292586 A GB2292586 A GB 2292586A
Authority
GB
United Kingdom
Prior art keywords
engine
exhaust
modified
cylinder
exhaust gases
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9417154A
Other versions
GB9417154D0 (en
Inventor
Robert Cooper
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB9417154A priority Critical patent/GB2292586A/en
Publication of GB9417154D0 publication Critical patent/GB9417154D0/en
Publication of GB2292586A publication Critical patent/GB2292586A/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)

Abstract

Ports in the cylinder are uncovered at b.d.c. to discharge exhaust and a cylinder head scavenge valve is opened to allow air under pressure to scavenge the exhaust gases. <IMAGE>

Description

Improvements to four stroke internal combustion Diston engines This invention relates to the improvement of the operation of a four stroke internal combustion piston engine equipped with a means of pressurising an inlet tract.
Traditional four stroke piston engines have inlet valves for the admission of the gaseous mixture and exhaust valves for the release of the products of combustion. These valves reside in the top of the engine cylinder or in the cylinder head and are operated by cams which control the timing of their opening and closing.
In this invention the traditional valves are retained but in addition exhaust ports are provided in the cylinder walls positioned so as to be uncovered and opened by the piston at the lower point of it's movement allowing the expanding exhaust gases to escape. An extra valve in addition to the normal inlet and exhaust valves is provided driven and timed by a cam to open when the cylinder exhaust ports are open so as to admit air under pressure from a supercharger turbocharger or suitable pump into the cylinder and scavenge the products of combustion through the cylinder ports. The rising piston expels the remaining diluted exhaust gases through the traditional exhaust valve opening in the normal manner, and the subsequant inlet phase of the engine cycle is carried out as in the traditional four stroke engine.
A diagram of the engine layout is shown in Fig 1.
The same operational engine cycle may be obtained on an engine with pressurised inlet tract and timed injection of the fuel by the addition of a lobe on the inlet valve cam positioned to open the inlet valve when the cylinder exhaust ports are opened by the descending piston thus admitting air from the inlet tract under pressure to effect the scavenging of the exhaust gases. The rest of the traditional four stroke cycle of exhaust stoke, inlet stroke, compression and combustion then follows.

Claims (1)

  1. Claims
    1/ A four stroke piston engine with supercharger, turbocharger or suitable air pump but with the addition of exhaust ports in the engine cylinders and additional valves positioned and timed to admit to the cylinders air under pressure to scavenge the products of combustion through the cylinder ports.
    2/ The modified engine as in Claim 1/ provides improved means of the expulsion of the exhaust gases and greater dilution of the exhaust gases by the scavenging air.
    3/ The modified engine as in Claim 1/ has improved cooling of the combustion region of the engine by the passage of the scavenging air.
    4/ The modified engine as in Claim 1/ has the hottest region of the engine moved to the area of the cylinder ports which is more easily cooled.
    5/ The modified engine as in Claim 1/ provides for greater dilution of any exhaust gases left in the engine cylinder with consequent less corruption of the next inlet charge.
    6/ The modified engine as in Claim 1/ provides improved conditions in the combustion chamber for the ignition and burning of the air/fuel mixture by virtue of Claims 3, 4 & 5.
    7/ The modified engine as in Claim 1/ provides for improved quality of the exhaust emmisions by virtue of Claims 2 & 6.
GB9417154A 1994-08-25 1994-08-25 Scavenging four-stroke engines Withdrawn GB2292586A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9417154A GB2292586A (en) 1994-08-25 1994-08-25 Scavenging four-stroke engines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9417154A GB2292586A (en) 1994-08-25 1994-08-25 Scavenging four-stroke engines

Publications (2)

Publication Number Publication Date
GB9417154D0 GB9417154D0 (en) 1994-10-12
GB2292586A true GB2292586A (en) 1996-02-28

Family

ID=10760373

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9417154A Withdrawn GB2292586A (en) 1994-08-25 1994-08-25 Scavenging four-stroke engines

Country Status (1)

Country Link
GB (1) GB2292586A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108779723A (en) * 2016-03-11 2018-11-09 沃尔沃卡车集团 The method for running piston internal-combustion engine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB217931A (en) * 1923-06-22 1925-04-02 Michael Kucsera Improvements in or relating to internal combustion engines
GB245151A (en) * 1924-12-24 1926-05-06 Alfred Buechi Improvements in internal-combustion engines provided with exhaust turbines and compressors
GB263105A (en) * 1925-12-15 1927-05-12 Sun Shipbuilding & Dry Dock Company
GB285972A (en) * 1926-11-23 1928-02-23 William Robert Gillespie Improvements in four stroke cycle internal combustion engines
GB309738A (en) * 1928-04-16 1929-04-18 Rennosuke Kondo Improved arrangement for operating four stroke internal combustion engines
GB568375A (en) * 1944-01-01 1945-03-30 John William Macaulay Improvements in or relating to internal combustion engines

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB217931A (en) * 1923-06-22 1925-04-02 Michael Kucsera Improvements in or relating to internal combustion engines
GB245151A (en) * 1924-12-24 1926-05-06 Alfred Buechi Improvements in internal-combustion engines provided with exhaust turbines and compressors
GB263105A (en) * 1925-12-15 1927-05-12 Sun Shipbuilding & Dry Dock Company
GB285972A (en) * 1926-11-23 1928-02-23 William Robert Gillespie Improvements in four stroke cycle internal combustion engines
GB309738A (en) * 1928-04-16 1929-04-18 Rennosuke Kondo Improved arrangement for operating four stroke internal combustion engines
GB568375A (en) * 1944-01-01 1945-03-30 John William Macaulay Improvements in or relating to internal combustion engines

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108779723A (en) * 2016-03-11 2018-11-09 沃尔沃卡车集团 The method for running piston internal-combustion engine
US11230982B2 (en) 2016-03-11 2022-01-25 Volvo Truck Corporation Method for operating an internal combustion piston engine
CN108779723B (en) * 2016-03-11 2022-04-22 沃尔沃卡车集团 Method for operating a piston internal combustion engine

Also Published As

Publication number Publication date
GB9417154D0 (en) 1994-10-12

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)