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Feed system for internal combustion engines to which is fed a fuel-air mixture and water vapor generated by a heat exchanger acted on by the exhaust gases, wherein there is a water chamber arranged before the heat exchanger in the water feed line, characterized in that the inlet and the outlet of th

Feed system for internal combustion engines to which is fed a fuel-air mixture and water vapor generated by a heat exchanger acted on by the exhaust gases, wherein there is a water chamber arranged before the heat exchanger in the water feed line, characterized in that the inlet and the outlet of the water chamber arranged directly before the heat exchanger are provided with valves which are to open automatically in an intrinsically known manner through the intake reduced pressure of the internal combustion engine and that the opening of the outlet valve is larger and/or longer in time than the opening of the inlet valve.INTRODUCTIONThe principle is already known of feeding water vapor to the combustion chamber of an internal combustion engine in addition to a fuel-air mixture, in order thereby to raise the power output and/or achieve a more economical fuel consumption, combined with a reduction in air-polluting components in the exhaust gases. For generating the water vapor herein, the heat of the exhaust gases can be utilized.A fundamental problem in systems of this type consists in an exact proportioning of the amount of water vapor to be supplied to the internal combustion engine depending on its operating condition at the particular time. The water vapor can for example be introduced into the fuel line of the internal combustion engine behind the carburetor or the injection pump and the reduced pressure occurring in the intake stroke of the piston can be used for transporting it. This principle has the advantage that to some degree it allows an automatic proportioning of the particular amount of water vapor added (at any particular time), since the reduced pressure determines the amount of water vapor taken in by it.In internal combustion engines which are used for propulsion in vehicles, a frequent change in the operating state takes place because of the changing load. It is known that in regard to these special operating conditions a relatively high consumption is indispensable for controlling the feed of this kind of internal combustion engines, in order to assure the feeding of an optimum fuel-air mixture for each possible operating condition.If additional water vapor is now introduced into the feed of the internal combustion engine, then it becomes immediately apparent that correspondingly high requirements must be imposed on the proportioning of the water vapor in order to avoid operating troubles. Since mechanical porportioning elements, valves in particular, must be fabricated from expensive materials and with high precision in view of the high temperature of the water vapor which is of the order of 400.degree. to 500.degree. C., and since on the other hand controlling a vapor is moreover more difficult than controlling a liquid, the proportioning is suitably done by mechanical regulating elements which are arranged in the water supply line.It has been found, however, that this method also does not lead to the desired preciseness of water vapor feed, since the water supply line is connected to a heat exchanger and is heated by the latter to a relatively high temperature. Besides this, a reverse heat flow occurs within the water fed into the heat exchanger, which, depending on the operating condition of the internal combustion engine and its related feed rate of the water, leads to fairly high temperatures on the regulating elements and impairs their operation despite their arrangement in the water line. This is the reason why water vapor feed into internal combustion engines has not found extensive use up to now.It is the objective of the invention to improve these conditions in such a way that with a relatively low expense an exact proportioning of water vapor which is not impaired by the heating is insured in feeding the water vapor into internal combustion engines.For a feed system for internal combustion engines into which a fuel-air mixture and water vapor generated by a heat exchanger acted on by exhaust gases are to be fed, this problem is solved according to the invention by having a water chamber arranged directly before the heat exchanger in the water feed line, the inlet and outlet of which chamber are provided with valves which are open automatically by means of the intake reduced pressure of the internal combustion engine, and by dimensioning the opening of the outlet valve to be larger and/or longer in time than the opening of the inlet valve.By the invention a reliably operating heat barrier is created, for it can be determined that when it is inserted before the heat exchanger, the line connected with the water reservoir remains quite cold, so that the required regulating elements can be provided in this line without any fear of their being impaired by too high temperatures. Additionally, the advantage of lower heat losses is achieved thereby, so that the heat gained causes an increase in the temperature of the water vapor generated in the heat exchanger and thereby a further improvement in the efficiency of the internal combustion engine. The invention therewith makes possible an application of the principle of feeding of water vapor into internal combustion engines in such a way that now its widespread adoption at a relatively low cost is conceivable also, especially in motor vehicles.A practical example of the invention is described in the following on the basis of the figures. They show:

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