Internal-combustion engines – Charge forming device – Supercharger
Patent
1988-05-03
1989-08-29
Koczo, Michael
Internal-combustion engines
Charge forming device
Supercharger
123198F, F02D 1702, F02B 3302
Patent
active
048607169
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention relates to a multi-cylinder diesel internal combustion engine with low compression ratio in the cylinders wherein during normal engine operation, all cylinders are supplied with fuel and produce power output and wherein during starting and possibly at partial load a so-called divided engine operation is obtained, wherein some cylinders operate as compressors without fuel supply for supplying compressed air to the other cylinders that operate as an engine. Here one compressor cylinder is connected with a respective engine cylinder by way of a line, independent of the normal suction and exhaust lines. This independent line includes at its one end, in the proximity of the compressor cylinder, a donor valve adapted to be controllably opened in the divided operation. At its other end, in the proximity of the engine cylinder, the independent line includes a receiver valve closing in the direction of the compressor cylinder. The piston of each compressor cylinder leads the piston of the coordinated engine cylinder by 30.degree. to 150.degree. crankshaft angle.
With such an arrangement, an improved supply of the cylinders operating as engine with precompressed combustion air is effected so that in the divided operation of the diesel internal combustion engine, the required compression end temperature for the ignition of the injected fuel is reached in the cylinders operating as engine notwithstanding a low compression ratio.
A diesel internal combustion engine of this type is known from the DE-PS No. 26 48 411. With divided operation of the diesel internal combustion engine, the cylinders operating as compressor remain cold in relation to the temperature of an engine cylinder. This effect results from the transfer of the air which is compressed in the compressor cylinder and heated thereby, to an engine cylinder and the subsequent sucking-in of air which has a lower temperature than the transferred compressed air. It has been found thereby that the cooling off of the compressor cylinders resulting from the air mass loss is not compensated by the heat supply from the cooling system.
During the transition from divided to full engine operation, ignition problems result therefore with the compressor cylinders because the compression end temperature is reached only after a warm-up phase of the respective cylinder. A rapid load acceptance of the diesel internal combustion engine is prevented thereby. It is therefore task of the invention to avoid in a diesel internal combustion engine of this type the cooling off of the cylinder interior spaces in the cylinders operated as compressors.
This task is solved according to the invention by having each of the receiver valves combined with a device for opening each respectively associated independent line in the direction toward the compressor cylinder and wherein control of the independent line takes place during the exhaust stroke of the coordinated engine cylinder and wherein a pulse for the actuation of the device is derived from an energy storage device by a distributor in dependence on engine crankshaft rotational speed. The arrangement effects an exhaust gas return from the engine cylinders into the compressor cylinders. As a result thereof, a temperature increase in the compressor cylinders is attained with divided operation of the diesel internal combustion engine. The same lines are used for the exhaust gas return which are already present in the diesel internal combustion engine for the transfer of the compressed air from the compressor cylinders. A further refinement is obtained wherein a change-over control slide valve is arranged in a control line of the donor valve and which is constructed to be acted upon by two differing actuating pulses. The energy storage device is a compressed air accumulator which is fed from at least one of the independent lines by way of a check valve.
It is further advantageous, if the multi-cylinder diesel internal combustion engine independent lines are encased with heat-insulating material.
The advantages a
REFERENCES:
patent: 4248198 (1981-02-01), Deutschmann et al.
Koczo Michael
MTU-Motoren und Turbinen Union
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