Internal-combustion engines – Additional air supply
Patent
1999-05-06
2000-10-31
Dolinar, Andrew M.
Internal-combustion engines
Additional air supply
1231882, F02B 4100
Patent
active
061386162
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a device in a combustion engine, according to the preamble of claim 1. In particular the invention relates to a device for feeding additional air to the engine. The invention also relates to a method for the feeding of additional air, according to the preamble of claim 19.
BACKGROUND OF THE INVENTION
In connection with combustion engines, turbo units are often utilized which comprise a turbine which is rotated by the flow of exhaust gases. The energy which is thus absorbed by the turbine is then transferred to a compressor which is arranged to compress the air on the intake side of the combustion engine and thus increase the amount of air in the combustion chamber. This means that a larger amount of fuel can be fed to a combustion chamber in an engine, thus increasing the power of the engine.
In turbocharged diesel engines intended for, for example, commercial vehicles the starting torque from the engine is often somewhat inadequate. The reason for this is that a turbocharged engine functions as an aspirating engine at low rpm's. The fact that the engine has a starting phase which corresponds to the function of an aspirating engine means that the amount of air which is typical for a turbocharged diesel engine is not supplied. This in turn means that the amount of fuel which is injected in the engine must be limited at low rpm's, in order to minimize the amount of smoke produced until the turbo unit can supply an amount of air which will permit an increased amount of fuel.
The above-mentioned sequence of events is furthermore unfavourable since it contributes to reduced performance during the starting phase of the engine. The engine will furthermore be perceived by those travelling in the vehicle as "insufficient" during the starting phase, since it has been necessary to limit the amount of fuel supplied during the initial "aspirating engine" phase.
one way of solving the above-mentioned problem is to feed extra additional air to the engine during this starting phase in order to thus simulate the turbo function and create the possibility of feeding extra fuel to the engine. Such an arrangement is previously known from patent document CH 623382 and comprises an arrangement in an engine where compressed air is pumped into the cylinders of the engine when starting.
SUMMARY OF THE INVENTION
The object of the present invention is to obtain an improved device in a combustion engine which is preferably equipped with a turbo unit, where the turbo function can be initiated earlier than in previously known devices and which adds to the starting torque of the engine. This object is achieved by means of a device of the initially mentioned kind, the characteristics of which will become evident from claim 1. The object is also achieved by means of a method, the characteristics of which will become evident from claim 19.
Preferred embodiments will become evident from the dependent claims.
The term "additional air" in the following refers to air supplied by means of the invention to each of the engine cylinders under certain predetermined conditions. The term "ordinary air" refers to air fed to the engine during its normal operation.
BRIEF DESCRIPTION OF THE DRAWINGS:
The invention will be described in the following in greater detail with reference to the appended drawings, in which:
FIG. 1 schematically shows a combustion engine in which the present invention is utilized,
FIG. 2 shows a cross-section of a valve device which can be utilized according to the present invention,
FIG. 3a-3e schematically show the function of the valve device of FIG. 2,
FIG. 4 shows a cross-section of a camshaft which can be used in the invention,
FIG. 5 shows a cross-section of a control valve which can be used according to the present invention, and
FIG. 6 shows an alternative embodiment of the invention.
PREFERRED EMBODIMENTS
FIG. 1 schematically shows a device in which the present invention can be used. The thus shows a combustion engine 1 which is preferably a conventional diesel engine
REFERENCES:
patent: 3792691 (1974-02-01), Sahnas
patent: 3987769 (1976-10-01), Yew
patent: 4162668 (1979-07-01), Jacob et al.
patent: 4240381 (1980-12-01), Lowther
patent: 5064423 (1991-11-01), Lorenz et al.
AB Volvo
Dolinar Andrew M.
Harris Katrina B.
LandOfFree
Device and method in combustion engines does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device and method in combustion engines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device and method in combustion engines will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2040469