Five-stroke internal combustion engine

An internal combustion engine of a type comprising at least one cylinder (2, 3) which includes a work chamber (C2, C3) with a volume which can be varied by the travel in the cylinder (2,3) of a piston (5,6) between a high dead center position and a low dead center position, under the action of pressure forces periodically generated in the said chamber, there being associated with each cylinder (2,3) a means of intake and evacuation of a gaseous fluid, the piston of each cylinder being connected to a crankshaft of the engine, using at least, on the one hand, a cylinder (1) functioning as a low-pressure cylinder in a two stroke mode which comprises the intake accompanied by the expansion producing useful work in every stroke of the piston of the low-pressure cylinder (1) to its low dead center and the exhaust during every stroke to its high dead center of a gaseous fluid and on the other hand, two cylinders (2,3) functioning as combustion cylinders in a four-stroke mode, which comprise the intake of air or of an air-fuel mixture during the first stroke of the piston of each of the combustion cylinders (2,3) to its low dead center, the compression of this air or of this air-fuel mixture in the combustion cylinder during the first stroke of the piston to its high dead center, followed by the combustion, the expansion of the gases of combustion during the second stroke of the piston to its low dead center producing useful work and the delivery of the combustion gases during the second stroke of the piston to its high dead center, the piston swept volume of each of the combustion cylinders (2,3) being smaller than that of the low-pressure cylinder (1), the combustion cylinders (2,3) alternatively delivering their gases of combustion to the low-pressure cylinder (11) for the purpose of a second expansion cycle of the combustion gases and their exhaust from the engine and comprising a means of excess feeding the combustion cylinder (2,3) wherein the volume compression ratio of the combustion cylinders is relatively low, so as to be able to be highly supercharged;

• wherein it comprises a means of control of the supercharge pressure of air or the air-fuel mixture at the intake of the combustion cylinders (2,3) to effect the adjustment of the engine load for a given speed, largely of the range of the functioning torque thereof, and a compressor driven mechanically or a turbo-compressor unit, whose turbine is driven by a supplementary expansion cycle of the exhaust gases of the engine, in order to effect the pre-compression of the air or the air-fuel mixture, if necessary cooled by means of a heat exchanger (15), the inlet of the turbine (32) being connected to a collector of combustion gases (29), fitted with a valve of the waste gate type (26) which can, in an open or partially open position, divert all or a part of the combustion gases directly to the engine exhaust;
• wherein the work chambers (C2,C3) of the combustion cylinders (2,3) comprise a means of direct injection of fuel into the compressed air during the compression stroke, in respect of the variable ratios of the weight of air divided by the weight of fuel and controlled according to the load of the engine, the work chambers (C2,C3) of the high-pressure combustion cylinders (2,3) being fitted with a means to make possible the ignition of the air-fuel mixture;
• wherein it comprises the exhaust ports (21) arranged in the low-pressure cylinder (1) to carry out, wholly or partially, the exhaust of the gases of combustion contained in the cylinder (1), the exhaust ports being uncovered by piston (4) of the low-pressure cylinder (1) when the latter is close to its low dead center;
• and
• wherein when the aforementioned turbo-compressor unit performs the pre-compression of the air or the air-fuel mixture at the intake of the combustion cylinders (2,3) up to three different manifolds (19,25,31) fed in a non-simultaneous manner, deliver, during the stroke of the piston (4) of the low-pressure cylinder (1) towards it high dead center, in the direction of the inlet of the turbine (29), the combustion gases contained in the low-pressure cylinder (1), all the manifolds except the last one (19,25) manifolds, each comprising a deviation flap (27,28) of, combustion gases controlled individually according to the load of the engine and which, in an open position, guide the gases of combustion from the low-pressure cylinder (1) directly to the exhaust, whilst when in the closed position, the deviation flap (2728) guides the said gases of combustion to the collector of combustion gases (29) at the inlet of the turbine (32), the last exhaust manifold (31) being the first in communication with the work chamber (C1) of the low-pressure cylinder (1).

An internal combustion engine of a type comprising at least one cylinder (2,3) which includes a work chamber (C2, C3) with a volume which can be varied by the travel in the cylinder (2,3) of a piston (5,6) between a high dead center position and a low dead center position, under the action of pressure forces periodically generated in the said chamber, there being associated with each cylinder (2,3) a means of intake and evacuation of a gaseous fluid, the piston of each cylinder being connected to a crankshaft of the engine, using at least, on the one hand, a cylinder (1) functioning as a low-pressure cylinder in a two stroke mode which comprises the intake accompanied by the expansion producing useful work in every stroke of the piston of the low-pressure cylinder (1) to its low dead center and the exhaust during every stroke to its high dead center of a gaseous fluid and on the other hand, two cylinders (2,3) functioning as combustion cylinders in a four-stroke mode, which comprise the intake of air or of an air-fuel mixture during the first stroke of the piston of each of the combustion cylinders (2,3) to its low dead center, the compression of this air or of this air-fuel mixture in the combustion cylinder during the first stroke of the piston to its high dead center, followed by the combustion, the expansion of the gases of combustion during the second stroke of the piston to its low dead center producing useful work and the delivery of the combustion gases during the second stroke of the piston to its high dead center, the piston swept volume of each of the combustion cylinders (2,3) being smaller than that of the low-pressure cylinder (1), the combustion cylinders (2,3) alternatively delivering their gases of combustion to the low-pressure cylinder (11) for the purpose of a second expansion cycle of the combustion gases and their exhaust from the engine and comprising a means of excess feeding the combustion cylinder (2,3) wherein the volume compression ratio of the combustion cylinders is relatively low, so as to be able to be highly supercharged;

• wherein it comprises five cylinders arranged in line including three high-pressure combustion cylinders (2,3) and two low pressure cylinders (1), two combustion cylinders (2) being located at the ends of the crankshaft to which are connected the two pistons (5) of these cylinders, the third high-pressure combustion cylinder (3) being located in the center and able to communicate with the two adjacent low-pressure cylinders (1) by respectively, at least one valve (11) and one decanting manifold (17), allowing simultaneous transfer during the second expansion cycle, the gases of combustion contained in the central combustion cylinder (3) in the two low-pressure cylinders (1), which are associated therewith and by the fact that the said low-pressure cylinders (1) receive, during the next rotation of the crankshaft following the travel of the piston to its low dead center, all the gases of combustion contained in the combustion cylinder (2) located at the end of the crankshaft and next to the low-pressure cylinder (1) in question;
• wherein it comprises a means of control of the supercharge pressure of air or the air-fuel mixture at the intake of the combustion cylinders (2,3) to effect the adjustment of the engine load for a given speed, largely of the range of the functioning torque thereof, and a compressor driven mechanically or a turbo-compressor unit, whose turbine is driven by a supplementary expansion cycle of the exhaust gases of the engine, in order to effect the pre-compression of the air or the air-fuel mixture, if necessary cooled by means of a heat exchanger (15), the inlet of the turbine (32) being connected to a collector of combustion gases (29), fitted with a valve of the waste gate type (26) which can, in an open or partially open position, divert all or a part of the combustion gases directly to the engine exhaust;
• wherein the work chambers (C2,C3) of the combustion cylinders (2,3) comprise a means of direct injection of fuel into the compressed air during the compression stroke, in respect of the variable ratios of the weight of air divided by the weight of fuel and controlled according to the load of the engine, the work chambers (C2,C3) of the high-pressure combustion cylinders (2,3) being fitted with a means to make possible the ignition of the air-fuel mixture;
• wherein it comprises the exhaust ports (21) arranged in the low-pressure cylinder (1) to carry out, wholly or partially, the exhaust of the gases of combustion contained in the cylinder (1), the exhaust ports being uncovered by piston (4) of the low-pressure cylinder (1) when the latter is close to its low dead center;
• and
• wherein when the aforementioned turbo-compressor unit performs the pre-compression of the air or the air-fuel mixture at the intake of the combustion cylinders (2, 3) up to three different manifolds (19, 25, 31) fed in a non-simultaneous manner, deliver, during the stroke of the piston (4) of the low-pressure cylinder (1) towards it high dead center, in the direction of the inlet of the turbine (29), the combustion gases contained in the low-pressure cylinder (1), all the manifolds except the last one (19,25) manifolds, each comprising a deviation flap (27,28) of, combustion gases controlled individually according to the load of the engine and which, in an open position, guide the gases of combustion from the low-pressure cylinder (1) directly to the exhaust, whilst when in the closed position, the deviation flap (27, 28) guides the said gases of combustion to the collector of combustion gases (29) at the inlet of the turbine (32), the last exhaust manifold (31) being the first in communication with the work chamber (C1) of the low-pressure cylinder (1).

An internal combustion engine of a type comprising at least one cylinder (2,3) which includes a work chamber (C2, C3) with a volume which can be varied by the travel in the cylinder (2,3) of a piston (5,6) between a high dead center position and a low dead center position, under the action of pressure forces periodically generated in the said chamber, there being associated with each cylinder (2,3) a means of intake and evacuation of a gaseous fluid, the piston of each cylinder being connected to a crankshaft of the engine, using at least, on the one hand, a cylinder (1) functioning as a low-pressure cylinder in a two stroke mode which comprises the intake accompanied by the expansion producing useful work in every stroke of the piston of the low-pressure cylinder (1) to its low dead center and the exhaust during every stroke to its high dead center of a gaseous fluid and on the other hand, two cylinders (2,3) functioning as combustion cylinders in a four-stroke mode, which comprise the intake of air or of an air-fuel mixture during the first stroke of the piston of each of the combustion cylinders (2,3) to its low dead center, the compression of this air or of this air-fuel mixture in the combustion cylinder during the first stroke of the piston to its high dead center, followed by the combustion, the expansion of the gases of combustion during the second stroke of the piston to its low dead center producing useful work and the delivery of the combustion gases during the second stroke of the piston to its high dead center, the piston swept volume of each of the combustion cylinders (2,3) being smaller than that of the low-pressure cylinder (1), the combustion cylinders (2,3) alternatively delivering their gases of combustion to the low-pressure cylinder (11) for the purpose of a second expansion cycle of the combustion gases and their exhaust from the engine and comprising a means of excess feeding the combustion cylinder (2,3) wherein the volume compression ratio of the combustion cylinders is relatively low, so as to be able to be highly supercharged;

• wherein it comprises an odd number, greater than five, of cylinders arranged in line in such a way that at the ends of its crankshaft are located two high-pressure combustion cylinders (2) between two low-pressure cylinders (1) and able to communicate with the two adjacent low-pressure cylinders (1), respectively by means of at least one valve and one decanting manifold, so as to transfer simultaneously during the second expansion cycle, the combustion gases contained in the combustion cylinder (3), to the two low-pressure cylinders (1) which are associated therewith;
• wherein it comprises a means of control of the supercharge pressure of air or the air-fuel mixture at the intake of the combustion cylinders (2,3) to effect the adjustment of the engine load for a given speed, largely of the range of the functioning torque thereof, and a compressor driven mechanically or a turbo-compressor unit, whose turbine is driven by a supplementary expansion cycle of the exhaust gases of the engine, in order to effect the pre-compression of the air or the air-fuel mixture, if necessary cooled by means of a heat exchanger (15), the inlet of the turbine (32) being connected to a collector of combustion gases (29), fitted with a valve of the waste gate type (26) which can, in an open or partially open position, divert all or a part of the combustion gases directly to the engine exhaust;
• wherein the work chambers (C2,C3) of the combustion cylinders (2,3) comprise a means of direct injection of fuel into the compressed air during the compression stroke, in respect of the variable ratios of the weight of air divided by the weight of fuel and controlled according to the load of the engine, the work chambers (C2,C3) of the high-pressure combustion cylinders (2,3) being fitted with a means to make possible the ignition of the air-fuel mixture;
• wherein it comprises the exhaust ports (21) arranged in the low-pressure cylinder (1) to carry out, wholly or partially, the exhaust of the gases of combustion contained in the cylinder (1), the exhaust ports being uncovered by piston (4) of the low-pressure cylinder (1) when the latter is close to its low dead center;
• and
• wherein when the aforementioned turbo-compressor unit performs the pre-compression of the air or the air-fuel mixture at the intake of the combustion cylinders (2, 3) up to three different manifolds (19, 25, 31) fed in a non-simultaneous manner, deliver, during the stroke of the piston (4) of the low-pressure cylinder (1) towards it high dead center, in the direction of the inlet of the turbine (29), the combustion gases contained in the low-pressure cylinder (1), all the manifolds except the last one (19,25) manifolds, each comprising a deviation flap (27,28) of, combustion gases controlled individually according to the load of the engine and which, in an open position, guide the gases of combustion from the low-pressure cylinder (1) directly to the exhaust, whilst when in the closed position, the deviation flap (27, 28) guides the said gases of combustion to the collector of combustion gases (29) at the inlet of the turbine (32), the last exhaust manifold (31) being the first in communication with the work chamber (C1) of the low-pressure cylinder (1).