US 5,692,464 AGranted

Diesel engine

AssigneeNissan Motor Co., Ltd.

InventorShuji Kimura

Life of this patent

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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.

Claims2

Dependent claims

A diesel engine comprising:

a cylinder,
a piston which reciprocates within said cylinder between a bottom dead center position and a top dead center position,
an intake valve for providing air to said cylinder,
a mechanism for alterating closing timing of said intake valve,
means for detecting an engine operational condition,
means for detecting a temperature of said air,
means for detecting a flow amount of said air,
means for calculating a temperature within said cylinder at compression top dead center from said engine operational condition, said temperature, said flow amount and a compression ratio of said piston, and
means for controlling said closing timing alteration mechanism so as to advance said closing timing of said intake valve when said temperature within said cylinder is lower than a predetermined range, and so as to retard said closing timing of said intake valve when said temperature within said cylinder is higher than said predetermined range.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/612,523Filed 8 Mar 1996
Priority: JP 7-05740916 Mar 1995
Granted: 2 Dec 1997
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

F02D 13/0234
Variable control of the intake valves only: changing the valve timing only
F01L 9/10
Valve-gear or valve arrangements actuated non-mechanically: by fluid means, e.g. hydraulic
F02D 13/0253
During engine operation: fully variable control of valve lift and timing using camless actuation systems such as hydraulic, pneumatic or…
F02D 13/0257
During engine operation: independent control of two or more intake or exhaust valves respectively, i.e. one of two intake valves remains closed or…