Power plants – Fluid motor means driven by waste heat or by exhaust energy... – With supercharging means for engine
Patent
1994-11-21
1996-09-03
Koczo, Michael
Power plants
Fluid motor means driven by waste heat or by exhaust energy...
With supercharging means for engine
F02B 2904
Patent
active
055512348
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to the field of internal combustion engines, particularly those for marine use. More specifically, the invention is concerned with a method for cooling charge air so as to maximize performance of the engine.
DESCRIPTION OF PRIOR ART AND SUMMARY OF THE INVENTION
The invention relates to a procedure for running an internal combustion engine, especially a marine diesel engine, where charging air is supplied to the cylinders by means of an exhaust gas turbo charger. Said air is conducted through a charge air cooler, but can also partially bypass the cooler. The invention also describes an internal combustion engine suited to the practice of such a procedure, especially a marine diesel engine provided with an exhaust gas turbo charger and a charge air cooler, which is connected by a charge air line to the exhaust air turbo charger on one side and to the cylinders of the combustion engine on the other side, and where a by-pass line with a control valve is provided which bypasses the charge air cooler.
It is a well known fact that charge air coolers, e.g. those for marine diesel engines, in time become clogged at the charge air intake side, resulting in correspondingly higher throughput resistance. This in turn leads to a reduction of charge air pressure and, consequently, to a decrease in engine power, which has to be compensated for by increased fuel consumption. Simultaneously, the exhaust gas turbo charger experiences increased loading.
An internal combustion engine with an exhaust gas turbo charger is already a state of the art item (DE 36 27 686 A1), it features a charge air line in which a charge air cooler is installed. In order to provide for relatively high charge air temperatures during the warm-up phase of this internal combustion engine across the complete load-and r.p.m.-range, but nevertheless prevent problems during the operating temperature phase of the engine, a by-pass line branches off and bypasses the charge air cooler. This by-pass line carries the total charge air stream until a predetermined engine temperature has been reached. Once the operating temperature of the engine has been reached, the by-pass line is blocked by means of a suitable valve-device, and all the charge air is conducted through the charge air cooler.
It is the objective of this invention to describe a procedure, and a suitable internal combustion engine for the procedure, with which the resistance which has to be overcome by the charge air is lowered overall, while the charge air pressure, and resulting therefrom the engine power, is increased; or, as resistance across the charge air cooler increases, the charge air pressure can be maintained. Simultaneously, the fuel consumption of the engine shall be reduced, and the load on the exhaust gas turbo charger shall be lowered.
This task is achieved by the above mentioned procedure, and according to this invention, by feeding water as coolant to the charge air cooler, by by-passing part of the charge air around the cooler even during normal operation of the engine, and by controlling the amount of by-passed air, so that, downstream of the charge air cooler, the total charge air will have a charge air temperature which is above the dew-point and does not exceed the maximum permissible charge air temperature for the engine. In all situations, where the total available cooling capacity of the charge air cooler, e.g. because of low cooling water temperature, would result in charge air temperatures which are too low, part of the charge air will be by-passed around the charge air cooler. This partial amount of charge air is controlled in such a manner that the resulting total charge air mixture, downstream of the charge air cooler, does not exceed the permissible temperature values. The charge air which has by-passed the charge air cooler meets with a clearly reduced resistance to passage, compared with the charge air conducted through the charge air cooler. This results in a desired increase of charge air pressure downstream of th
REFERENCES:
patent: 4562697 (1986-01-01), Lawson
MTZ Motortechnische Zeitschrift 49 (1988) 7/8, pp. 294/295.
Koczo Michael
Purdue David C.
Purdue John C.
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