US1172389A - Starting two-stroke internal-combustion engines. - Google Patents

Description

- T. REUTER. STARTING TWO-STROKE iN ERNAL COMBUSTION ENGINES.

APr ucmoN min JAN. 9. mi 1,172,389.

Patented Feb. 22, 1916;

BROS. DIESEL ENGINE COMPANY, OF ST. LOUIS, MISSOURI,

A CORPORATION OF MISSOURI.

STARTING TWO-STROKE INTERNAL-COMBUSTION ENGINES.

Application filed Ianuaryl), 1911.

To all w ham it may concern:

Be it known that L'Tnnonon Rnu'rnn, engineer, a citizenv of the Swiss Republic, residing at :24; Obere \Vielandstrasse, -Winterthur, Switzerland, have invented certain new and useful Improvements in Starting Two-Stroke Internalombustion Engines; and I do hereby declare a full, clear, and exact description of the invention, such as will enable others skilled in the-art to which it appcrtains to make and use the same.

This invention is an improvement in the method of operating internal combustion motors and more especially in the method of starting two-stroke motors in operation by means of fluid pressure, such, for example, as compressed air suitably introduced into the motor cylinder. In the ordinary mode of starting motors in this way the expansion of the pressure fluid produces a re duction of the cylinder temperature toward and at the end of the expansion stroke, and upon the following compression stroke such temperature loss is not sufiiciently overcome to insure reliable ignition of the initial fuel charges, this being especially the case where ignition takes place by the temperature 0 compression of air or gas in the cylinder and also when the scavenging of the cylinder has imperfect.

been omitted or is The object of the present lIlVQlltlOIh-lS to insure reliability of ignition under all circumstances, by means of the method diagrammatically indicated in the drawing forming part hereof. Assuming the motor receives a compressed air-charge from point 1 to point 2, the exansion to commence irom point 2. Now say the expansion is interrupted at point 3, for instance by opening a valve, piston sli e, or the like, equalization of pressure will be established with the exterior, this pressure equalization taking place, for example, at point l. This will takeplace sooner or later according to the extent of the valve opening. Suction then begins -from point l by the piston traveling from this point The suction may take place through a special valve or through the valve serving or establishing the pressure equalization. From oint 5 to point 6 the piston travelsover the exhaust ports and upon the return stroke of the piston compression commences at point 5 and reaches its maximum at point 1. As-

Specifitation of Letters Patent.

the following to be to point 5.

Patented Feb. 22, 1316.

Serial No. 601,718.

suming for instance the temperature of the incoming compressed air to be 200 C. and its pressure to amount to 35 atmospheres. Thls condition of the starting air would correspond to point 2 in the diagram. EX- pansion now following to the end of the stroke along the dotted line 2 to 5, as in the ordinary case, the temperature at the end of the expansion is about 50 C. If no or insufficient scavenging is effected whereby this cold air is not removed, the charge-subsequently compressed will not attain the required ignition temperature, thereby rendering ignition quite impossible. According to the present invention, however, the expansion is interrupted at point 3, as above stated, and equalization of pressure is established at point 4. During this pressure equalization to atmospheric pressure the temperature falls considerably less than during a regular expansion. From point 4: to point 5 the piston draws in air from the outside, which air may be cold, z'. e., atmospheric temperature, preliminarily heated or hot. In the place of air any indifferent gas may be introduced. At the end of the stroke the cylinder contains a quantity of air- 0 considerably higher temperature than would be the case in the event of an uninterrupte expansion without the use of the present method. The ignition temperature during the subsequent compression can therefore be attained with ease and a regular starting is consequently insured. On ignition taking place normal working may be employed.

The admission of the compressed air may be regulated at will. As a result of the suction stroke from point 4 to point 5 the cylinder will contain sufiieient air for combustion and ignition will take place evenif littleor no compressed air enters the cylinder.

I claim,

1. A method of starting combustion motors by compressed air which consists in admitting compressed air to the motor cylinder interrupting the expansion of such air therein before the end of the expansion stroke and prior to the point at which products of combustion are released during normal operation, whereby to prevent excessive decrease of temperature and thereupon introducing and compressing a gas in the cylinder for combustion.

2. A method of starting combustion motors which comprises admitting a .com-

pressed fluid to the motor cylinder, allowing the same to expand against the piston, in--' terrupting' such expansion before the end of the expansion stroke and prior to the point at which products of combustion are released during normal operation, whereby to prevent excessive decrease of temperature in the cylinder, and in a following stroke adniitting and compressing in such. cylinder the material for the combustion charge.

3. A method of starting two stroke combustion motors which comprises expanding a compressed fluid in the motor cylinder, i.n terrupting such expansion before the end of the expansion stroke, admitting a Warmer gas to the cylinder during the remainder of such stroke,- and in a following compression 1,17a,ese

THEODOR REUTER.

Witnesses CARL GUBLER, Auens'r Rlvnoo.

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