CA2540729A1 - Timing advancement for exhaust valve in internal combustion engine - Google Patents

Timing advancement for exhaust valve in internal combustion engine Download PDF

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Publication number
CA2540729A1
CA2540729A1 CA002540729A CA2540729A CA2540729A1 CA 2540729 A1 CA2540729 A1 CA 2540729A1 CA 002540729 A CA002540729 A CA 002540729A CA 2540729 A CA2540729 A CA 2540729A CA 2540729 A1 CA2540729 A1 CA 2540729A1
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CA
Canada
Prior art keywords
exhaust valve
interval
power
stroke
opening
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.)
Granted
Application number
CA002540729A
Other languages
French (fr)
Other versions
CA2540729C (en
Inventor
Barnett J. Robinson
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CA2540729A priority Critical patent/CA2540729C/en
Publication of CA2540729A1 publication Critical patent/CA2540729A1/en
Application granted granted Critical
Publication of CA2540729C publication Critical patent/CA2540729C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/0242—Variable control of the exhaust valves only
    • F02D13/0249—Variable control of the exhaust valves only changing the valve timing only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F02D2041/001—Controlling intake air for engines with variable valve actuation
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

An internal combustion engine having a timing device for advancing operation of an exhaust valve, and a method of operating the exhaust valve, wherein the timing device opens the exhaust valve less than 90 degrees before bottom dead center in a terminal portion of the power stroke of the engine, but more than approximately 30 degrees before the bottom dead center. The engine is a four-stroke engine, and the open interval of the exhaust extends into the exhaust stroke. The advancement in the opening of the exhaust valve reduces fuel consumption.

Claims (10)

1. An internal combustion engine comprising:
a cylinder, a crankshaft, and a piston connected by a connecting rod to the crankshaft and being movable with reciprocating motion within the cylinder upon rotation of the crankshaft, the piston motion providing a succession of four strokes including an induction stroke, a compression stroke, a power stroke and an exhaust stroke;
an intake valve and an exhaust valve located in the cylinder, wherein the intake valve serves to admit gas during the induction stroke into the cylinder, and the compression stroke serves to compress a quantity of the gas within the cylinder in preparation for the power stroke, the gas being a mixture of air and fuel in the case of a gasoline engine, and air without fuel in the case of a diesel engine;
a timing device synchronized with rotation of the crankshaft for operating the exhaust valve to provide for an interval of closure of the exhaust valve and an open interval of the exhaust valve, an opening of the exhaust valve permitting an exhausting of exhaust gas from the cylinder, wherein the open interval of the exhaust valve extends over a terminal portion of the power stroke and into the exhaust stroke, and wherein a starting point for the opening interval of the exhaust valve is taken at the instant when the exhaust valve has risen 0.050 inches from the valve seat; and wherein the timing device is operative to advance an opening of the exhaust valve prior to a power advancement interval in the terminal portion of the power stroke; and wherein an advancing of the timing of the opening of the exhaust valve to coincide with the power advancement interval provides for a maximum power output capability of the engine with a reduced value of efficiency of the engine, and the opening of the exhaust valve prior to the power advancement interval provides for an increased value of the efficiency and a reduced value of the power output capability of the engine.
2. An engine according to claim 1 wherein the opening of the exhaust valve is advanced before the power advancement interval by at least 10 degrees of rotation of the crankshaft.
3. An engine according to claim 1 wherein the opening of the exhaust valve is advanced before the power advancement interval over a range of time corresponding to a range of 10 to 50 degrees of rotation of the crankshaft.
4. An engine according to claim 3 wherein the opening of the exhaust valve occurs in an interval of time corresponding to a range of 40 to 80 degrees of crankshaft rotation prior to bottom dead center at the end of the power stroke.
5. An engine according to claim 1 wherein the opening of the exhaust valve occurs in an interval of time prior to the power advancement interval, and corresponding to a range of 40 to 80 degrees of crankshaft rotation prior to bottom dead center at the end of the power stroke.
6. A method of improving fuel efficiency in an internal combustion engine, wherein the engine comprises:
a cylinder, a crankshaft, and a piston connected by a connecting rod to the crankshaft and being movable with reciprocating motion within the cylinder upon rotation of the crankshaft, the piston motion providing a succession of four strokes including an induction stroke, a compression stroke, a power stroke and an exhaust stroke;
an intake valve and an exhaust valve located in the cylinder, wherein the intake valve serves to admit gas during the induction stroke into the cylinder, and the compression stroke serves to compress a quantity of the gas within the cylinder in preparation for the power stroke, the gas being a mixture of air and fuel in the case of a gasoline engine, and air without fuel in the case of a diesel engine; and a timing device synchronized with rotation of the crankshaft for operating the exhaust valve to provide for an interval of closure of the exhaust valve and an open interval of the exhaust valve, an opening of the exhaust valve permitting an exhausting of exhaust gas from the cylinder;
wherein the method comprises the steps of:
allowing the open interval of the exhaust valve to extend over a terminal portion of the power stroke and into the exhaust stroke, and wherein a starting point for the opening interval of the exhaust valve is taken at the instant when the exhaust valve has risen 0.050 inches from the valve seat; and operating the timing device to advance an opening of the exhaust valve prior to a power advancement interval in the terminal portion of the power stroke;
wherein an advancing of the timing of the opening of the exhaust valve to coincide with the power advancement interval provides for a maximum power output capability of the engine with a reduced value of efficiency of the engine, and the opening of the exhaust valve prior to the power advancement interval provides for an increased value of the efficiency and a reduced value of the power output capability of the engine.
7. A method according to claim 6 wherein the opening of the exhaust valve is advanced before the power advancement interval by at least 10 degrees of rotation of the crankshaft.
8. A method according to claim 6 wherein the opening of the exhaust valve is advanced before the power advancement interval over a range of time corresponding to a range of 10 to 50 degrees of rotation of the crankshaft.
9. A method according to claim 8 wherein the opening of the exhaust valve occurs in an interval of time corresponding to a range of 40 to 80 degrees of crankshaft rotation prior to bottom dead center at the end of the power stroke.
10. A method according to claim 6 wherein the opening of the exhaust valve occurs in an interval of time prior to the power advancement interval, and corresponding to a range of 40 to 80 degrees of crankshaft rotation prior to bottom dead center at the end of the power stroke.
CA2540729A 2006-03-22 2006-03-22 Timing advancement for exhaust valve in internal combustion engine Expired - Fee Related CA2540729C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA2540729A CA2540729C (en) 2006-03-22 2006-03-22 Timing advancement for exhaust valve in internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA2540729A CA2540729C (en) 2006-03-22 2006-03-22 Timing advancement for exhaust valve in internal combustion engine

Publications (2)

Publication Number Publication Date
CA2540729A1 true CA2540729A1 (en) 2007-09-22
CA2540729C CA2540729C (en) 2010-10-19

Family

ID=38520912

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2540729A Expired - Fee Related CA2540729C (en) 2006-03-22 2006-03-22 Timing advancement for exhaust valve in internal combustion engine

Country Status (1)

Country Link
CA (1) CA2540729C (en)

Also Published As

Publication number Publication date
CA2540729C (en) 2010-10-19

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Effective date: 20160322