Two-cycle diesel engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsHideaki Ito, Masanori Miyamoto
Life of this patent
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Abstract
A two-cycle diesel engine and means for operating it to improve the performance by increasing the compression ratio by the closing of a supplemental exhaust port under light loads and low speeds. In order to reduce combustion chamber temperature and reduce nitrous oxide emissions, the injection timing is advanced an additional increment during the closing of the supplemental exhaust port. Various control strategies are described which involve either quickly raising the compression ratio and retarding the injection timing.
Claims20
A fuel injection system for a diesel engine including means for increasing the compression ratio under low and mid-range speed and load conditions, means responsive to engine speed for retarding the beginning the fuel injection in response to an engine speed reduction, and means for further changing the running condition in response to a change of compression ratio for lowering combustion chamber temperatures and precluding the formation of nitrous oxide.
A method of operating a diesel engine comprising increasing the compression ratio under low and mid-range speed and load conditions, retarding the beginning of fuel injection in response to an engine speed reduction, and further changing a running condition in response to the change of compression ratio so as to lower combustion chamber temperatures and preclude the formation of nitrous oxides.
A fuel injection system for a diesel engine including means for increasing the compression ratio under low and mid-range speed and load conditions, means responsive to engine speed for retarding the beginning the fuel injection in response to an engine speed reduction, and means for further retarding the beginning of fuel injection for lowering combustion chamber temperatures and precluding the formation of nitrous oxide in response to sensing of a condition which is likely to increase combustion chamber temperature.
Dependencies are inferred from the claim text.