engleski

Increasing the efficiency of the cylinder gas exchange at the gasoline engine at part load by using double exhaust valve operation

The efficiency of spark ignited engines, which use restriction on the intake as a regulation element, decreases during partial load compared to full load. This is due to increased losses in the exchange of working medium, precisely, loss of suction. There are different approaches to solve this problem, most are based on variable control of the intake valves, on the Miller or Atkinson cycle. Described here is an approach that is based on the variable regulation of the exhaust valves. The basic principle is to partly or completely remove regulatory inlet restrictor during the inlet stroke, the engine draws in the maximum amount of air so that the pumping losses are minimal. During the compression stroke an exhaust valve is open to release the excess air, i.e. the difference between the maximum amount for the full load and the amount needed for the desired loading. A comparison is made between standard engine regulated with a valve on the intake system and an engine which is regulated by dual opening of the exhaust valves. Research was carried out on the model of a four cylinder Otto engine with direct injection into the cylinder.

Throttled engine ; efficiency ; exhaust valve control ; losses ; direct injection

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