Internal combustion engine with secondary expansion of the working gas in the part-load range

摘要

In the case of internal combustion engines is a high compression ratio and the operation of the cylinder with a high load advantageously. Advantageously, it would also, the expansion ratio could be selected to be greater than the compression ratio. There are energized, in which in the lower partial-load range, the two outer cylinder with a higher load, are operated and in the case of the two inner cylinders of the valve is switched off, compression ratio and expansion ratio in this case are the same. A further variant, there are in the form of a three-cylinder engine, in which only the two outer cylinder and be operated at the center cylinders with a larger stroke volume than one of the two outer cylinder is used for this purpose, the working gas of the cylinder 1 and 3 further to expand, this variant requires more cubic capacity, in order to represent a certain output. An engine variant is now proposed, in the case of the of four cylinders in the lower part load area of the load in the two outer cylinders is lifted and the two inner cylinder for the subsequent expanding of the exhaust gas of the two outer cylinder, which can be. This is carried out by means of closure of the activation of certain valves. in the upper load range, all of the cylinder is operated at.