Internal-combustion engines – Four-cycle – Rotating valve
Patent
1987-05-21
1988-12-06
Myhre, Charles J.
Internal-combustion engines
Four-cycle
Rotating valve
123190BD, F01L 700
Patent
active
047889454
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process and apparatus for controlling a gas evacuation circuit, in particular of an internal combustion motor functioning along a 4 phase cycle having controlled or diesel ignition and equipped with a rotational distributor.
In 4 phase rotational distribution motors and more particularly those provided with a rotational distributor having a single lateral transfer channel assuring both, successively the escape then the admission, while the body of the distributor blocks the combustion chamber during the times of compression and combustion, the transfer channel, at the upper dead point at the end of escape and beginning of admission, is open to the combustion chamber at the end of opening of the escape and at the beginning of opening of the admission, thus forming what has conventionally been called "balance" or "sweeping". It is necessary during this phase (very brief in time) to empty to the maximum the burned gases from the combustion chamber or dead volume (which is true for all types of motors) and in this particular case, the volume of the transfer channel which increases considerably the volume of this "dead volume", all the more that the design of motors leads to a considerable transfer channel volume so as to obtain inlet and escape passage cross sections compatible with a good respiration, proof of good efficiency.
Along these lines, it is not rare to have to form a transfer channel whose volume can reach 10 to 25% of the total volume of the individual cylinder. Furthermore, it is necessary to know that a 4 phase motor operates according to the laws of vibratory movements and that, along the length of the conduits both for admission as well as escape, their diameters or cross sections, the distribution timing (before opening of the admission, after closure of the escape) determine synchronization, rhythmically creating pressures and reducing pressures both at admission as well as during escape. The perfect synchronization is to obtain a maximum reduced pressure or a maximum vacuum during escape and a maximum pressure during admission at the upper dead point while the escape is still open and the admission is already open such that the dead volume is swept and emptied of its burnt gases thus allowing for a better filling of the fresh gas, or working fluid, and a better efficiency of the motor.
In practice this perfect synchronization cannot be obtained except over a very narrow range of rotational speed and one must therefore expect to lose efficiency at other motor rotation speeds, a loss proportional to the value of the dead volume.
Now we have seen that in the case of a rotational distributor having a single lateral transfer channel, this dead volume is much more substantial that than of a conventional motor with valves, and that this loss will be proportionally more substantial even though partially compensated by a better filling, rendering this type of motor more acoustic than conventional motors.
The process according to the invention makes it possible to eliminate this defect, to empty well the dead volume constituted of the volume of the combustion chamber added to the volume of the transfer channel at the upper dead point, and to improve over the entire range of speed the motor efficiency.
The process according to the invention is characterized by the fact that each cylinder is equipped with two distinct escape conduits:
a principal escape conduit operating normally but which will be blocked much earlier in the cycle than normally, substantially before the upper dead point or at the upper dead point such that, no possible back pressure intervenes, following the rotational speeds, to reintroduce the burnt gases in the dead volume constituted by the transfer channel of the distributor and the combustion chamber or prevent the proper emptying of the said dead volume;
a secondary escape circuit which, substantially, during the closure of the principal conduit, will place the dead volume in communication with a conduit or a chamber maintained under vacuum by all appr
REFERENCES:
patent: 1278083 (1918-09-01), Force
patent: 1595607 (1926-08-01), Jones
patent: 1616030 (1927-02-01), Dock
patent: 2989955 (1961-06-01), Dunne
patent: 3526216 (1970-09-01), Henvaux
patent: 3945359 (1976-03-01), Asaga
patent: 4016840 (1977-04-01), Lockshaw
patent: 4116189 (1978-09-01), Asaga
Myhre Charles J.
Okonsky David A.
LandOfFree
Process and apparatus for controlling a gas evacuation circuit o does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process and apparatus for controlling a gas evacuation circuit o, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process and apparatus for controlling a gas evacuation circuit o will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1488621