Internal combustion engine provided with a plurality of power un

Internal-combustion engines – Accessories – Covers – trays – vibrators – corrosion inhibitors – air filters

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Details

60718, 123DIG8, F02D 2504

Patent

active

044806124

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to an internal combustion engine provided with a plurality of power units in which one or more power units are selectively used in accordance with driving conditions of a vehicle driven by the engine.


BACKGROUND ART

It is preferable to design an engine for a constant load so that a desired torque is generated at a low specific fuel consumption. However, it is difficult to design an engine for driving vehicles so as to have a low specific fuel consumption within the entire range of the engine operation, since load on the engine varies in a wide range.
FIG. 1 shows a fuel consumption characteristic of an engine for a vehicle at various specific fuel consumptions (g/ps.hr), in which the abscissa is engine speed (r.p.m.), and the ordinate is engine torque. Curve A shows running load (resistance) of a vehicle on a flat road. The curve A is determined by the air resistance of the body of the vehicle and the gear ratio of the transmission of the engine and the specific fuel consumption is determined by the performance of the engine. As seen from FIG. 1, the engine of FIG. 1 is so designed as to have lower fuel consumption at a higher engine torque range than that of a lower engine torque range and so that the curve A may pass through low fuel consumption zones in the higher engine torque range. However, the engine designed to have a low fuel consumption in a higher engine torque range has poor fuel consumption in a lower torque range.


SUMMARY OF THE INVENTION

The object of the present invention is to provide an engine for a vehicle, which is provided with a plurality of power units, one or more power units of which are selectively operated in accordance with conditions of the engine operation, whereby the engine is operated in low fuel consumption zones within a wide range of the engine operation.
The engine of the present invention comprises at least two power units, one of which is a first power unit and the other is a second unit. In a high torque range, all power units are operated, and in a low torque range, the first power unit is operated to drive the vehicle.
The engine of the present invention is designed to have a fuel consumption characteristic shown in FIG. 1 by operating all power units, and the first power unit is designed to have a fuel consumption characteristic shown in FIG. 2. The running load curve B is arranged to pass through the lowermost fuel consumption zone D in fuel consumption zone C.
The engine of the present invention is provided with means for detecting a low reduction gear ratio selection of a transmission, means for detecting a light load operation of the engine, and a control circuit responsive to output signals from both detecting means for disengaging the second power unit.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a graph showing a fuel consumption characteristic of an engine according to the present invention when all power units operate;
FIG. 2 is a graph showing a fuel consumption characteristic of the engine of the present invention when a first power unit operates;
FIG. 3 is a schematic perspective view of an engine according to the present invention;
FIG. 4 is a schematic perspective view of a carburetor assembly of the engine;
FIG. 5 is a block diagram showing a control system of the present invention; and
FIG. 6 is a perspective view showing a gear shift lever portion.


BEST MODE FOR EMBODYING THE INVENTION

The present invention will be explained in detail hereinafter with reference to FIGS. 3 to 6. The illustrated engine according to the present invention comprises a first power unit 1 of a two-cylinder type, and a second power unit 2 of two-cylinder type.
Pistons 4 and 5 of the first power unit 1 are connected to a crankshaft 3 by connecting rods respectively. On the other hand, pistons 7 and 8 of the second power unit 2 are connected to a crankshaft 6 by respective connecting rods. A power transmitting gear 9 securely mounted on the crankshaft 3 engages with an output gear 11 mounted on an output shaft 10. T

REFERENCES:
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patent: 1306864 (1919-06-01), Stoddard
patent: 1309279 (1919-07-01), Eggert et al.
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patent: 2623617 (1952-12-01), Snyder et al.
patent: 2757651 (1956-08-01), Winkler
patent: 3949556 (1976-04-01), Wallis
patent: 4027484 (1977-06-01), Wallis
patent: 4027485 (1977-06-01), Wallis
patent: 4069803 (1978-01-01), Cataldo
patent: 4337623 (1982-07-01), Kronogard

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