Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1996-03-08
1997-12-02
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123569, 123501, F02D 1300, F01L 1300
Patent
active
056924640
ABSTRACT:
In a diesel engine, the closing timing for the intake valves is maintained in the vicinity of bottom dead center during engine starting and in a low engine revolution speed region, while on the other hand this closing timing is retarded the more from bottom dead center, the higher is the engine revolution speed region, and thereby the engine can be designed with a lower compression ratio. Preferably the temperature within the cylinder at compression top dead center, i.e. the compressions stroke end temperature, is calculated, and the closing timing for the intake valves is controlled so as to keep this final compression temperature within a predetermined range. By doing this, reduction of the size of the diesel engine is made possible due to lowering of the compression ratio thereof, while both the composition of the exhaust gas and also engine output power are maintained at preferable levels.
REFERENCES:
patent: 5293741 (1994-03-01), Kashiyama et al.
patent: 5482012 (1996-01-01), Yoshioka
patent: 5529031 (1996-06-01), Yoshioka
Lo Weilun
Nissan Motor Co,. Ltd.
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