Internal-combustion engines – Engine speed regulator – Responsive to deceleration mode
Patent
1993-05-24
1994-05-31
Nelli, Raymond A.
Internal-combustion engines
Engine speed regulator
Responsive to deceleration mode
123321, 123294, F02D 3902
Patent
active
053159748
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an internal combustion engine with compressor function comprising, in addition to intake and exhaust valves for each cylinder, an extra exhaust valve in at least one cylinder, which extra exhaust valve, in its open position, puts the cylinder chamber in communication with valve means containing an exhaust duct and disposed to permit exhausting of intake air to a pneumatic system but prevent intake of air to the cylinder chamber via said exhaust duct.
It is previously known to use one or more cylinders in a diesel engine as compressor cylinders by providing the cylinders with an extra exhaust valve and equipping the injection system of the engine with devices through which the supply of fuel to the cylinder serving as compressor cylinders can be interrupted. Such a compressor arrangement can, inter alia, be designed to supplement the ordinary air compressor, which normally supplies the vehicle pneumatic system, when the capacity of this normal compressor for some reason is not sufficient, or alternatively it can be designed as the sole compressed air source for the vehicle.
A diesel engine with compressor function of the above-mentioned type is shown and described in U.S. Pat. No. 2,005,536. The engine is provided with a mechanical injection system having a conventional multiple cylinder injection pump. Via a system of cam shafts with cams controlling shunt valves, the fuel supply to the compressor cylinder in question is interrupted at the same time as the extra exhaust valve is opened under the influence of additional cams on the cam shafts. This known installation is complicated in its mechanical design and increases, inter alia due to the presence of the shunt valves on the high pressure side of the injection system, the susceptibility of the injection system to disruption.
The purpose of the present invention is to achieve an internal combustion engine of the type described by way of introduction in which the supply of fuel to a cylinder serving as a compressor cylinder can be interrupted without the need to supplement the engine injection system with complicated specially designed equipment.
This is achieved according to the invention by virtue of the fact that the engine has a fuel injection system with a unit injector with an electrically operated spill valve for each cylinder and that means are arranged which can keep the spill valve of the cylinder provided with the extra exhaust valve open at the same time as the extra exhaust valve is open.
In injection systems with electric unit injectors, an electronic control unit is coupled to a solenoid valve in each injector. This valve determines, in response to signals from the control unit, when the injection to each cylinder is to be initiated and terminated. When the valve closes, the pump piston integrated in the unit injector builds up a pressure and the injection is initiated when this pressure exceeds the opening pressure of the injection nozzle. When the injection is to be terminated, the solenoid valve is opened and the pressure drops below the opening pressure of the injection nozzle. The supply of fuel to a particular cylinder can thus be entirely cut off simply by a control unit signal to open the spill valve of the associated unit injector, when the cylinder is to function as a compressor cylinder.
BRIEF DESCRIPTION OF DRAWINGS
The drawing represents a portion of the cylinder block and cylinder head embodying the current invention.
The invention is described in more detail with reference to an example shown in the accompanying drawing,, where the Figure shows a crone-section through a schematically represented cylinder with associated portion of the cylinder head in the diesel engine.
In the Figure, 1 designates a portion of a cylinder block and 2 designates a portion of a cylinder head. Details such as intake and exhaust ducts with associated valves and other details which are not directly pertinent to the invention have been left out for the sake of clarity. The engine is a direct injection diesel and ha
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patent: 2005536 (1935-06-01), Dickson
patent: 4557232 (1985-12-01), De Lorean
patent: 4658781 (1987-04-01), Guinea
patent: 4706624 (1987-11-01), Meistrick et al.
patent: 4930471 (1990-06-01), Korner et al.
patent: 5078238 (1992-01-01), Okada
patent: 5195489 (1993-03-01), Reich
Sabelstrom Mats
Tenglund Lars
AB Volvo
Nelli Raymond A.
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