Internal-combustion engines – Charge forming device – Supercharger
Patent
1987-05-14
1989-02-07
Koczo, Michael
Internal-combustion engines
Charge forming device
Supercharger
1235591, 60397, F02B 3336, F02D 2302
Patent
active
048024570
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an arrangement in a throttle-controlled internal combustion engine equipped with a supercharger in the form of an air compressor which comprises helical rotors (male and female rotors) located in a compression chamber and which is connected via a transmission arrangement to the crankshaft of the vehicle engine.
Known arrangements of this kind suffer the drawback of poor efficiency when the compressor is working at partial load. Another drawback encountered with such arrangements is that difficulties are encountered with regard to the mutual co-action between the supercharger and the fuel supply system. Furthermore, when passing from partial load to full load, there is a delay before full charging pressure is reached.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a simplified arrangement of the aforesaid kind in which these drawbacks are avoided.
This object is achieved in accordance with the invention by means of an arrangement having the characteristic features set forth in the claims.
The invention is based on the concept that if a supercharger in the form of a screw compressor is provided on the compressor inlet side with a capacity regulating or control device, conventional with screw compressors (c.f. for instance Swedish Patent Specification No. 198 588), and the capacity is reduced the compressor will function as an expander or expansion machine, in the same manner as a gas throttle will throttle the engine suction inlet, and therewith transfer power to the engine. This can be achieved directly through the transmission, or indirectly by retarding the expansion machine, e.g. with the aid of a charging generator. The expansion effect can be increased by varying the transmission between the engine and the screw rotor machine, such that when the machine functions as an expander the transmission ratio is changed so that the screw rotor machine has a lower transmission ratio than when it functions as a compressor. This can readily be achieved by selectively effecting the drive through the male rotor when operated as an expander through the female rotor when operated as a compressor. This results in a reduction in fuel consumption when running at partial engine loads and when idling. The requirement of a gas throttle is eliminated, and fuel can be supplied readily to the engine in a manner which will also obviate the need for a conventional carburettor. A particularly important advantage is afforded when the arrangement incorporates a fuel supply device that has provided therein a plurality of supply apertures which are arranged to be exposed in sequence by the capacity regulating slide during its movement towards a fully open inlet port. This results in a well balanced increase in the fuel supply in proportion to the increase in engine load. Another specific advantage afforded by the invention is that the air of combustion is often cooled during its passage through the expansion machine, due to the expansion that takes place at part engine loads. Consequently, if the load on the engine should suddenly be rapidly increased, subsequent to the machine having previously functioned as an expander machine at partial engine loads, the still cool combustion air (cooled by cold surfaces downstream of the expander) is able to counteract knocking in the combustion chambers during this stepping-up period.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to two exemplifying embodiments thereof illustrated in the accompanying drawings, in which
FIG. 1 is a sectional view of a first embodiment of the invention taken on the line I--I in FIG. 2;
FIG. 2 is a sectional view taken on the line II--II in FIG. 3;
FIG. 3 is a sectional view of a second embodiment taken on the line III--III in FIG. 4;
FIG. 4 is a sectional view taken on the line IV--IV in FIG. 3;
FIG. 5 is a sectional view taken on the line V--V in FIG. 3; and
FIG. 6 is the same sectional view showing the capacity reg
REFERENCES:
patent: 678570 (1901-07-01), Jones
patent: 2201014 (1940-05-01), Scheerer
patent: 2266820 (1941-12-01), Smith
patent: 2358815 (1944-09-01), Lysholm
patent: 3045447 (1962-07-01), Wagenius
patent: 3088658 (1963-05-01), Wagenius
patent: 3108740 (1963-10-01), Schibbye
patent: 4455131 (1984-06-01), Werner-Larsen
patent: 4508089 (1985-04-01), Baumgartner et al.
patent: 4667646 (1987-05-01), Shaw
Koczo Michael
Svenska Rotor Maskiner AB
LandOfFree
Internal combustion engine provided with a supercharger does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Internal combustion engine provided with a supercharger, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Internal combustion engine provided with a supercharger will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1079133