Power plants – Fluid motor means driven by waste heat or by exhaust energy... – With supercharging means for engine
Patent
1988-03-22
1989-12-05
Koczo, Michael
Power plants
Fluid motor means driven by waste heat or by exhaust energy...
With supercharging means for engine
417380, 417392, F02B 3700
Patent
active
048844055
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for the operation of a valve adapted to be operated in step with the exhaust gas outlet of a piston charger adapted to be driven by the exhaust gas pulses of an IC engine, which has at least one expansion space, which has at least one exhaust gas inlet and an exhaust gas outlet and is delimited by a moving piston, and to a piston machine for implementing such a method.
In order to make it possible for the usable energy of the exhaust gases arriving at the piston charger to be optimally used, control of the exhaust gas outlet is required, because otherwise a large proportion of the exhaust gases is able to escape from the expansion space without performing work. A valve in the exhaust gas outlet in the case of an exhaust gas driven piston charger is mentioned in the German unexamined specification 3,318,136 without however providing any information as to how such control or operation is to take place.
Known piston machines for operation by the exhaust gases of an IC engine have a valve operating system on the outlet side, which is driven directly from the IC engine. This leads to complex and accordingly expensive designs, which furthermore hinder freedom of the arrangement in space of the piston machine in relation to the IC engine. If the piston machine is operated as an auxiliary machine in cooperation with the IC engine, and more especially as a charger, an adaptation of the piston machine to the operational state of the IC engine is required, which in the case of valve operation directly from the IC engine is not automatically possible, unless there is an additional and expensive operating system.
It is desirable for the charger to operate even in partial load states, if the usable energy of the exhaust gas pulses is possible not sufficient to cause a full piston stroke in the piston machine. Then it is particularly important for the exhaust gas outlet of the piston machine to be closed as soon as possible in order to prevent any loss of usable energy. On the other hand, the exhaust gas outlet should remain open as long as possible after the working stroke and after the return stroke of the working piston in order to allow the exhaust gas pulses, which are expelled from the IC engine after the working stroke, to flow out with as little obstruction as possible, i.e. without causing back pressure.
One object of the invention is to provide a method of the initially mentioned type such that there is a minimum amount of complexity for the operation of the piston charger, such operation being via a valve from the exhaust gas outlet for the optimum utilization of the exhaust gas pulses of the IC engine, the method furthermore being designed to offer the possibility of automatically adapting the piston charger to the current operational state of the IC engine. A further object of the invention is to devise a valve arrangement such that it is suitable for implementation of the method.
In the context of the initially mentioned method, this object of the invention is to be attained inasfar as the kinetic energy for valve operation is extracted from the usable energy of the rhythmically arriving exhaust gas pulses.
Apart from the exhaust gas duct conducting the exhaust gases from the IC engine to the piston machine in this method no further connection between the IC engine and the piston machine for valve operation is required.
In order to implement the method it is possible to use a valve arrangement and a piston machine able to be driven by the exhaust gas pulses of an IC engine and having at least one expansion space delimited by a moving working piston, the limit of the expansion space opposite to the working piston being provided with at least one exhaust gas inlet and at least one exhaust gas outlet, the latter being provided with an actuated closing member.
In order to be able to apply the method in accordance with the invention to such a valve arrangement, the valve arrangement is so designed, in accordance with a very simple, practically tested form of the invention, that
REFERENCES:
patent: 3421448 (1969-01-01), Brewer et al.
patent: 4166410 (1979-09-01), Schlosser
patent: 4403925 (1983-09-01), Kuhlen et al.
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