Internal-combustion engines – Charge forming device – Gaseous fuel and air mixer
Patent
1993-08-12
1995-07-25
Yuen, Henry C.
Internal-combustion engines
Charge forming device
Gaseous fuel and air mixer
F02M 2104
Patent
active
054352886
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for injecting a gaseous fuel into an internal combustion engine with several cylinders, comprising a vaporizer/pressure regulator, metering means for supplying the fuel from the vaporizer/pressure regulator to the inlet of each cylinder, as well as an injection valve provided in each pipe near the inlet of each cylinder, for maintaining a constant pressure between the metering means and each inlet. Such a device is known from Dutch Application 8,600,611. This device has a manifold header which is connected at one side to a central supply pipe supplied by the metering means, and, at the other side, is connected to a number of supply pipes each running to the inlet of a cylinder. A pressure regulating valve, for the purpose of making the pressure upstream of the valve independent of the pressure downstream of the valve, is also provided between the metering means and the manifold header.
This known device has various disadvantages. Although the pressure regulating valve used here protects the supply pipe lying upstream thereof as regards sudden pressure changes in the inlet manifold of the engine, response problems can still occur as a result of pressure equalization in the pipes situated between the pressure regulating valve and the inlet manifold.
It is also found to be difficult to supply all cylinders uniformly. The supply of the cylinders far away from the manifold header often remains lower than that of those closer to it.
SUMMARY OF THE INVENTION
The object of the invention is therefore to provide a device of the type described above which does not have these disadvantages. This is achieved in that the metering means have separate metering apertures, each aperture belonging to its own cylinder and connected by means of a separate pipe of its own to that cylinder.
Each cylinder is now supplied directly by its own metering element. The supply pipes for all cylinders can consequently be held separate in such a way that the favouring of one cylinder over another largely be avoided.
Besides, the whole supply line, running from the metering element to the inlet of the cylinder in question, is not affected by pressure fluctuations in the inlet manifold. This means that virtually no response problems can occur.
The metering means can be designed in various ways. According to a particularly attractive and relatively simple embodiment, provision is made for the metering means to have two metering elements which are displaceable relative to each other in a virtually gastight manner, and which can overlap to a greater or lesser extent for determining the passage of the metering apertures.
For an internal combustion engine, the quantity of fuel flowing through the engine varies roughly with the product of two parameters: the speed of rotation of the engine and the specific mass of the mixture. The specific mass of the mixture depends on the temperature and pressure prevailing in the inlet manifold. The metering means must therefore be regulated on the basis of these two parameters. This can be achieved in a simple manner through the fact that one element has a cylindrical space which is connected by means of a number of slits, equal to the number of cylinders, to the pipes connected to the cylinders, in which cylindrical space an externally cylindrical slide can be moved.
The slide can be controlled through being coupled to an actuator controlled by a processor which can control the actuator on the basis of the speed of rotation of the engine. The load regulation can in this case be achieved through the vaporizer/pressure regulator being connected to the inlet manifold in such a way that a pressure change in the inlet manifold produces a pressure change in the vaporizer/pressure regulator. The pressure change in the gas flow for the metering device produces a mass change of the gas, and therefore a change in the total quantity of gas supplied per unit time. The rate of flow also increases because of the pressure change. Both effects ensure the corre
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Koltec B.V.
Necam B.V.
Solis Erick
Yuen Henry C.
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