Exhaust gas temperature assist for two-cycle uniflow scavenged diesel engine at lower engine loads
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United States of America Patent
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Nov 17, 2020
Grant Date -
Nov 21, 2019
app pub date -
May 21, 2018
filing date -
May 21, 2018
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Abstract
A method of raising exhaust gas temperatures of a two-cycle uniflow scavenged engine at lower loads. At lower loads, the exhaust valves are activated with a frequency that is less frequent than every engine cycle. This retains exhaust within the cylinder for one or more cycles, and when the exhaust valves are again activated, the exhaust temperature will be elevated. For engines having a means for controlling intake manifold pressure, such as a compressor having variable speed or a means for bleeding off compressor output, intake manifold pressure can be reduced at low loads, which also has the effect of elevating exhaust temperatures.
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