US1537128A

US1537128A - Method of starting internal-combustion engines

Info

Publication number: US1537128A
Application number: US494930A
Authority: US
Inventors: Mayer Rudolf
Original assignee: FIRM OF MASCHINENFABRIK AUGSBU
Current assignee: FIRM OF MASCHINENFABRIK AUGSBU; FIRM OF MASCHINENFABRIK AUGSBURG-NUERNBURG AG
Priority date: 1921-08-24
Filing date: 1921-08-24
Publication date: 1925-05-12
Anticipated expiration: 1942-05-12

Description

May 12, 1925. 1,537,128

R. MAYER METHOD OF STARTING INTERNAL COMBUSTION ENGINES Filed Aug. 24. 1921 11v VENTOR A To/m5 Y6 Patented May 1;, 1925.

.UNlTED STATES PATENT OFFICE.

RUDOLF MAYER, OF GOLDSCHMIEDEN KREIS, BRESLAU, GERMANY, ASSIGNOR TO THE FIRM OF MASCHINENFABRIK AUGSBURG-NUERNBURG, AKTIENGESELLSCHAFT, OF AUGSBURG, GERMANY, A GERMAN CORPORATION.

neuron of srraa'rrne INTERNALCOMBUSTION enemas.

Application filed August 24, 1921/ Serial No. 494,930.

enanrnn uunnn THE raovrsroxs or run ACT or MARCH 3, 1921, 41 sun I..,- 1313.

T allwhom it may concern:

Be it known that I, RUnoLr MAYER, a citizen of Germany, residing at- Linden Str., Goldschmieden Kr., Breslau, Germany, have invented certain new and useful Improvements in Methods of Starting Internal- Combustion Engines (for which I have filed application in Germany, July 5, 1915), of which the following is a specification.

The present invention relates to a method of'starting internal combustion engines of the type in which ignition iseffected by means of the high temperature attained in the cylinder during the compression stroke, and in which'the products of combustion are expelled from the cylinder'by an inrush of air.

It is common in engines of this type to provide means for cooling the scavenging air during the operation of the engine for the purpose of increasing the wei ht of air which is compressed at each strolre of the piston, or starting the engine, however,

when the parts are cold, it is usually necesea that the scavenging air be heated in or er to generate a temperature sufiiciently high to cause ignition.

It is accordingly a principal object of the present invention to provide a method for starting engines of the above type in which the air passing to the cylinder 1s heated during the starting period and is normally cooled during the time when the engine is in operation.

More specifically it is an object of the invention to utilize the same means which are provided to normally cool the scavenging air for the purpose of heating such air during the starting period. The entire system is thus rendered simple and accessible, since only a single unitary apparatus is required for heating and for cooling the scavenging a1r. v In the accompanying drawing, which is a view largely diagrammatic, I have illustrated by way of example a preferred embodiment of apparatus for carrying one my improved method. I

In the said drawing (1 indicates the pump employed for compressin the scavenging air drawn from the atmosp are or other con venient source through a feed pipe 6, and

passing it at any desired compression through the heat exchanger 6 into the reservoid 9, from which it may be supplied to the internal combustion engine as required. The heat exchanger 72 may be of any well known type containing two fluid passages'having leak-proof connections between them.

During the startin period of the engine.

when it is desirable t at the scavenging air be heated, steam is supplied to the heating space of the exchanger 12 through the line a leading from a steam main or other convenient supply. In the line a there is provided a three-way valve d which may be turned to admit steam to the heat exchanger or which may be turned to permit a flow from the line 7' into the exchanger 6, the line f being connected with a supply of cold water or other cooling medium for use in cooling the air during normal operation of the engine. When the engine is first started valve d is turned to the position shown, in which case steam will be admitted to the heat exchanger 6 and will warm theair on its way to the engine. As soon as the engine begins to operate satisfactorily under its own power, the valve 12 is turned 90 in the direction indicated by the arrow, in which position it will shut ofi the flow of steam and will permit the cooling fluid to circulate through the ex changer b.

It is to be understood that any convenient fluid having a temperature materially higher than that of the air passing to the reservoir 9 may be employed as a heating medium, for instance, hot water, hot gases such as flue gases, and the like. Likewise any convenient cooling fluid other than cold water may be em loyed if desired. I have illustrated a preierred embodiment of the apparatus for carrying out my improved method, but it is to be understood that the apparatus may be variously constructed to carr out my invention as defined in the appen ed claims. I claim: a a

i 1'. In the operation of Diesel engines of the two-cycle type, -in which. air under pressure is introduced into the cylinder to scavenge the cylinder and to furnish the charge of air for combustion, themethod which comprises the steps of'heating the scavenging air before admission to the engine cylinder, and subsequently cooling said air after the engine begins to operate under its own power.

2. I11 the operation of Diesel engines of the two-cycle type, in which air under pressure is introduced into the cylinder to scavenge the cylinder and to furnish the charge of air for combustion, the method which comprises the steps of heating the scavenging air before admission to the engine cylinder, and simultaneously discontinuing said heating and efiecting a material cooling of said air after the engine begins to operate under its own power.

3. In the operation of Diesel engines of the two-cycle type, in which air under pressure is introduced into the cylinder to scav enge the cylinder and to furnish the charge of air for combustion, the method which comprises the steps of passing a heating medium into heat exchanging proximity with the scavenging air on its Way to the engine cylinder, and replacing said heating medium by a cooling medium after the engine begins to operate under its own power.

4. In a method for starting internal combustion engines whose scavenging air is normally cooled during the operation of the engine, the step of temporarily passing a heating medium in heat exchanging proximity with said air along the same course normally traversed by the cooling medium.

5. In a starting system for internal combustion engines, a compressor for supplying air to the engine cylinder at a pressure above atmospheric, 2. heat exchanger interposed between said compressor and said cylinder, said heat exchanger having a passage for conveying the air discharged from said compressor, and nieans for supplying said heat exchanger successively with a heating medium and with a cooling medium.

6. In a Diesel engine, a compressor for supplying air to the engine cylnder at a pressure above atmospheric, a heat exchanger interposed between said compressor and said cylinder, said heat exchanger having a passage for conveying the air dis? charged from said compressor, means for supplying extraneous heat to said heat exchanger during the starting of the engine, and means for supplying a cooling medium to said heat exchanger during normal operation of the engine.

In testimony whereof I aflix my signature.

RUDOLF MAYER.