Internal-combustion engines – Engine speed regulator – Responsive to deceleration mode
Patent
1981-06-05
1983-07-19
Cuchlinski, Jr., William A.
Internal-combustion engines
Engine speed regulator
Responsive to deceleration mode
123 9014, 123182, F02D 3500
Patent
active
043938329
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a method and means for regulating the braking action of diesel engines with several cylinders, whereby the compression work of the compression stroke is used to produce the braking effect.
2. Description of the Prior Art
It is known to regulate the valves of a diesel engine so that the braking effect of the compression stroke is used. Compressed air may be supplied to the cylinder during a short moment at the beginning of the stroke, whereby the compression work is increased.
According to the known art very complicated means have been used to regulate this procedure by means of the ordinary valves. This means has included pressurized pilot air systems having distributing slide valves, which are regulated by turn over axis in accordance with the working face of the engine. Long pipings are included and because the valves of the cylinders for regulating the braking action are cut-off valves, which act rapidly, very often violent oscillations occur in the pilot air system, whereby the regulation of the braking action is disturbed. The object of the present invention is to simplify the means, which are needed for controlling the valves and the object is also to use as much of the ordinary compressed air starter system as possible. Furthermore, the object of the invention is to use the normal work cycle of the engine to produce a sub-pressure, which increases the braking effect.
BRIEF DESCRIPTION OF THE DRAWINGS
The characterizing features of the present invention are stated in the enclosed claims and an embodiment of the invention will be described in the following with reference to the accompanying drawings.
FIG. 1 is hereby a section of a part of a cylinder head to which is connected means for creating a positive pressure in the cylinder at the beginning of the compression stroke.
FIG. 2 is also a section of a part of a cylinder having means for creating a sub-pressure in the cylinder after the compression stroke.
FIG. 3 is a sectional view of the embodiment shown in FIG. 1, taken along line 3--3.
FIG. 4 is a sectional view of the embodiment shown in FIG. 2, taken along line 4--4.
SUMMARY AND DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION
One embodiment of the invention is described with reference to FIG. 1. Every cylinder of the engine or every second cylinder of the engine or any other number of cylinders of the engine have a servo-aggregate 1, consisting of a magnet valve 2. This servo-aggregate can control a valve which includes component parts 3, 8, 9 and 10 of the cylinder. The valve may alternatively be one of the ordinary starting valve, the safety valve or the exhaust valve of the cylinder. The operation of the servo-aggregate is thus to open the compression side of the cylinder to a supply pipe 14, 15 for the pressurized air via a channel 6 by means of said valve during a certain moment during the working phases of the cylinder. The valve illustrated in FIG. 1 is of known type, but is briefly described as follows. It includes a sleeve 3, which is inserted in a hole through the cylinder head. Within the sleeve there is a valve body consisting of a shaft 8 and a valve disc 9. The shaft 8 is in the upper end connected to a servo-piston 10, which is forced upwards by means of a compression spring 11. A space within the sleeve is provided above the servo-piston 10 and the servo air can be introduced to said space through a channel 12. The upper end of the sleeve 3 is covered by a cap 13. When servo air is supplied via the channel 12 to the upper side of the servo-piston, the valve shaft 8 and the valve disc 9 will very rapidly move downwards so that the valve opens and pressurized air passes in through the channel 6.
The very specific problem, which is solved by the present invention is to supply servo air rapidly in at the right moment in order to open the valve. This is accomplished by electric signals coming from a transmitter, which is common for the engine and which signals will reach the magnet valve 2
REFERENCES:
patent: 1799430 (1931-04-01), Loew
patent: 3667435 (1972-06-01), Bygdnes
patent: 4226216 (1980-10-01), Bastenhof
Hellemaa Heikki
Samuel Olof
Cuchlinski Jr. William A.
Nordstjernan AB
Oy Warstsila AB
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