Power plants – Fluid motor means driven by waste heat or by exhaust energy... – With supercharging means for engine
Patent
1990-04-30
1992-02-25
Bertsch, Richard A.
Power plants
Fluid motor means driven by waste heat or by exhaust energy...
With supercharging means for engine
123562, F02B 3344
Patent
active
050902040
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method and an arrangement for controlling the boost pressure on an internal combustion engine with a first and a second suction path, each having suction pressures which are controlled.
BACKGROUND OF THE INVENTION
There is a known arrangement for boost control, having two pressure sensors which each measure the suction-path pressure in one of the two suction paths. These measured suction-path pressures are each compared with a desired value, and one of two means of controlling determines a duty factor for a bypass valve on each of the two supercharging turbines from the respective control deviation values.
With the known arrangement, therefore, there are different suction-path pressures when the two pressure sensors do not work in an identical way, which happens frequently.
SUMMARY OF THE INVENTION
The object on which the invention is based is to provide a method for boost control, by means of which the boost pressures in two suction paths can each be regulated to the same value with a high degree of accuracy. A further object on which the invention is based is to provide an arrangement for carrying out such a method.
The invention relates to a method for boost control in an internal combustion engine having a first and a second suction path with the suction pressures of each path being controlled. According to a first embodiment of the method, the boost pressure in the first suction path is measured and this boost pressure is regulated to a desired value. The differential pressure between the boost pressures in the first and second suction paths is measured and the boost pressure in the second suction path is regulated to the desired value by taking into account the boost pressure in the first suction path and the differential pressure.
In a second embodiment of the method of the invention, the boost pressures in the first and second suction paths are measured alternately by switching over the pressures to a single pressure sensor. The control value determined for one suction path is maintained, while the boost pressure for the other suction path is measured and controlled.
In the arrangement according to the invention, a pressure sensor is connected only to one suction path. Additionally, however, there is a differential-pressure sensor between the two suction paths. It is possible by means of this arrangement to carry out a method according to which the suction pressure in that suction path, to which the pressure sensor is connected, is controlled directly by means of the measured pressure signal, while the pressure in the other suction path is controlled by means of the pressure signal from the other suction path and the differential pressure. This arrangement and the associated method do not place high demands on the accuracy of the pressure sensor and of the differential-pressure sensor. It is merely necessary to ensure that, when the differential pressure is 0, the differential-pressure sensor indicates this differential pressure 0 correctly.
In another embodiment of the arrangement according to the invention, there is only a single pressure sensor which can be connected alternately to the two suction paths. Thus, since the same pressure sensor is used for pressure measurement in both suction paths, identical suction-path pressures can be set easily, irrespective of the accuracy of the pressure sensor. The method with the arrangement just mentioned works in such a way that, during the time when the pressure signal for one suction path is being measured, the pressure signal for the other suction path is maintained, so that it is available for the control.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is explained in detail below by means of the embodiments illustrated by figures. Of these:
FIG. 1 shows an arrangement for boost control with a pressure sensor and a differential-pressure sensor; and
FIG. 2 shows an arrangement for boost control with a single pressure sensor which can be fitted alternately to two suction paths.
DESCRIPTION O
REFERENCES:
patent: 2199259 (1940-04-01), Hersey
Bonitz Jorg
Kunzel Walter
Miller Bernhard
Rohde Siegfried
Bertsch Richard A.
Freay Charles G.
Ottesen Walter
Robert & Bosch GmbH
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