Internal-combustion engines – Two-cycle – Whirl through piston-controlled ports
Patent
1987-09-21
1989-05-09
Okonsky, David A.
Internal-combustion engines
Two-cycle
Whirl through piston-controlled ports
123 65P, 60314, F02B 2700, F02B 2702, F02B 2706
Patent
active
048278807
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an apparatus for improving the charging and intake/exhaust efficiencies in the cylinders of internal combustion engines such as two-cycle gasoline engines, four-cycle gasoline engines and rotary engines. More particularly, the present invention is concerned with a pulsation controller in the intake/exhaust system of an internal combustion engine, which is designed to detect the phase of a standing wave present in the intake/exhaust system, thereby controlling the impedence or the timing for opening or closing valves or ports in the intake/exhaust system and hence the phase of a standing wave present in that system to improve the intake/exhaust efficiencies for more efficient operation.
BACKGROUND TECHNIQUE
For instance, the piston valve type of two-cycle gasoline engine has its intake/exhaust cycle of an air/fuel mixture controlled by a port in a cylinder and a piston reciprocating within the cylinder. In order to enhance the charging efficiency of the air/fuel mixture in the cylinder, it is thus required that the air/fuel mixture be forced at a high density on the intake side, while a forcing-back action be caused to occur on the exhaust side so as to prevent blowing-through of fresh air from the cylinder. For that reason, as in the two-cycle gasoline engine shown in Laid-open Utility Model No. 55-132321, the two-cycle gasoline engine has been such that an exhaust pipe is formed into a chamber shape narrowed down at the extreme end, and exhaust gases are admitted into that portion at a timing just before an exhaust port is closed, making use of the reflected wave of exhaustion. However, it is impossible to obtain all the tuning (resonance) due to a difference in the revolutions of the engine. For that reason, various means for regulating the phase of the reflected wave in the intake/exhaust system have been taken to obtain the tuning (resonance) of the intake/exhaust pulsation.
That is to say, the exhaust timing, for instance, has generally been varied depending upon the revolutions of an engine, and there has been a system wherein arranged in the vicinity of an exhaust port is a variable regulation valve which is designed to be turned, for instance, when the revolutions of the engine is increased, thereby putting forward the exhaust timing for more satisfactory operation.
In such a conventional system, however, the revolutions of an engine is used as a control factor. Thus, this system is not complete, although it makes it possible to approximately reproduce the timing good for the intake/exhaust efficiencies obtained in advance by calculation or experimentation. In other words, the impedance in the exhaust system, the speed of sound having an influence upon the velocity of a standing wave and all other factors vary actually depending upon the degree of opening of a throttle, temperature of the intake/exhaust system, differences in atmospheric pressure due to elevation differences, changes in the volume of an exhaust chamber or deformation of chamber due to build-ups (carbon), etc. in an exhaust pipe, wearing of an engine and the like. Thus, the fact is that to use only the revolutions of an engine as the control factor cannot accommodate such changes.
The situation being like this, the present invention now develops a novel engine controller which can produce the desired output in every state of operation by directly detecting and controlling pulsation having an immediate influence upon the desired operation of such an intake/exhaust system.
DISCLOSURE OF THE INVENTION
In order to attain the aforesaid object, the present invention provides a pulsation controller in the intake/exhaust system in an internal combustion engine comprising a cylinder to which an intake pipe and an exhaust pipe are connected and a piston movably mounted within said cylinder, and carrying out the respective strokes of suction, compression, combustion and exhaustion to produce a rotation energy output, which includes: a detection means for detecting a pulsation by sensor in
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Ban Masaki
Morita Hiroyuki
Taniuchi Kazuman
Honda Giken Kogyo Kabushiki Kaisha
Okonsky David A.
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