1-11. (canceled)
12. A method for ascertaining and monitoring fill level of a medium in a container by means of a fill-level measuring device using a travel time measuring method, comprising the steps of:
transmission signals are transmitted toward the medium and reflection signals are received;
the received reflection signals are registered as echo signals in an echo function dependent on travel time or travel distance;
based on measuring device- and container-specific reflection planes, possible reflection regions in the echo function are calculated by means of an evaluation algorithm;
based on the calculated reflection regions, disturbance echo signals andor multiecho signals in the echo function are classified;
non-classified reflection signals are ascertained andor checked as wanted echo signals by means of a search algorithm;
from a position andor an amplitude of at least one wanted echo signal, fill level is determined; and
the measured value of fill level is output.
13. The method as claimed in claim 12, wherein:
by means of the evaluation algorithm, at least one reflection position andor at least one reflection amplitude of the possible reflection regions in the echo function areis calculated.
14. The method as claimed in claim 13, wherein:
the reflection positions of the reflection regions are determined by the evaluation algorithm by earlier calculating all possible reflections and transmissions of the transmission signals at the reflection planes.
15. The method as claimed in claim 13, wherein:
the reflection positions of the reflection regions are determined by the evaluation algorithm by registering distances of the measuring device- and container-specific reflection planes and calculating by addition of the distances of the reflection planes traveled through by the transmission signal.
16. The method as claimed in claim 13, wherein:
the reflection amplitudes of the reflection regions are determined by the evaluation algorithm by registering attenuation measures of the measuring device- and container-specific reflection planes and calculating by addition of the attenuation measures of the reflection planes traveled through by the transmission signal.
17. The method as claimed in claim 15, wherein the distances andor attenuation measures of the measuring device- and container-specific reflection planes are input as measuring device andor container dependent variables into the evaluation algorithm or ascertained in a startup method and stored.
18. The method as claimed in claim 12, wherein:
a dynamic plausibility review is performed by means of the algorithm by comparing the ascertained reflection regions with the associated reflection amplitudes and the reflection positions at the measuring device- and container-specific reflection planes with the echo signals in the echo function.
19. The method as claimed in claim 18, wherein:
for the dynamic plausibility review, the reflection amplitudes andor reflection positions of a measuring device- and container-specific reflection plane are compared with a position andor an amplitude of the echo signals.
20. The method as claimed in claim 12, wherein:
the received reflection signals are registered as echo signals in a measured echo function, or measured envelope curve; and
based on measuring device- and container-specific reflection planes, possible reflection regions are registered by means of an evaluation algorithm with the calculated echo function, or the calculated envelope curves.
21. The method as claimed in claim 20, wherein:
the wanted echo signals are ascertained by difference forming of the measured echo function, or the measured envelope curve, with the calculated echo function, or the calculated envelope curves.
22. The method as claimed in claim 20, wherein:
by comparison of the measured echo function, or the measured envelope curve and the calculated echo function, or the calculated envelope curves, of disturbance reflections andor multiple reflections, covered wanted echo signals, which do not appear as separate echo signals in the measured echo functions, or measured envelope curve, are ascertained.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A fuel injection method in a fuel injection system, said fuel injection system comprising:
a fuel injection nozzle including a fuel reservoir and a needle valve;
an accumulator which accumulates fuel at a predetermined pressure;
a fuel line through which the fuel reservoir and the accumulator are connected;
a pressure cutoff valve which is provided along the fuel line, for cutting off fuel pressure flow from the fuel injection nozzle to the accumulator;
an injection control fuel chamber which is connected to the fuel line at a downstream side of the pressure cutoff valve;
an injection control valve which performs fuel injection by closing the needle valve due to an action of a fuel pressure upon the injection control fuel chamber and by opening the needle valve due to removal of fuel from the injection control fuel chamber;
an intensifier which is connected to the fuel injection nozzle and the injection control fuel chamber at a downstream side of the pressure cutoff valve; and
intensifier control means which increases a fuel pressure at a downstream side of the pressure cutoff valve by operating the intensifier, said fuel injection method comprising the steps of:
suspending operation of the intensifier control means; and
performing an after injection of fuel at an intermediate pressure between a predetermined pressure of the accumulator and a static maximum pressure which is statically determined due to operation of the accumulator and the intensifier.
2. The fuel injection method according to claim 1, wherein when an amount in which fuel is injected by the fuel injection nozzle is maximum, a period during which pressure of fuel injected increases is set so as to correspond to \u2153 or more of the entire injection period.
3. The fuel injection method according to claim 1, wherein when the intensifier is operated by the intensifier control means, before reaching a static maximum pressure which is statically determined by a geometric intensified pressure ratio of the intensifier and a pressure of the accumulator due to operation of the accumulator and the intensifier, the injection control valve is operated to start fuel injection from the fuel injection nozzle, and a maximum injection pressure of fuel injected from the fuel injection nozzle is set to be equal to or less than the static maximum pressure.
4. The fuel injection method according to claim 1, wherein when fuel injection from fuel injection nozzle is suspended by the injection control valve, before the needle valve is completely closed, operation of the intensifier control means is suspended to stop the intensifier, whereby an injection pressure of fuel injected from the fuel injection nozzle is decreased to a predetermined pressure.
5. The fuel injection method according to claim 1, wherein an opening speed and a closing speed of the needle valve is set such that the higher the fuel pressures of both the fuel reservoir and the injection control fuel chamber are, the higher the opening speed and the closing speed of the needle valve are.
6. The fuel injection method according to claim 1, wherein when a multi-stage injection is performed in which fuel injection from the fuel injection nozzle is carried out a plurality of times per 1 cycle of an engine, the intensifier is operated at least two or more times by the intensifier control means.
7. The fuel injection method according to claim 1, wherein the intensifier comprises a cylinder and a piston and wherein fuel is injected by controlling a moving rate of the intensifier piston so as to arbitrarily change at least one of a maximum injection pressure, a rate of increase of the injection pressure at the start of an increase of pressure, a rate of decrease of the injection pressure at the completion of injection, a pilot injection pressure, and an after injection pressure, of fuel injected from the fuel injection nozzle.
8. The fuel injection method according to claim 7, wherein the intensifier control means comprises a piston control valve and wherein the fuel injection is performed by individually controlling each of the injection control valve and the piston control valve, and regulating an operational phase difference therebetween.
9. The fuel injection method according to claim 7, wherein the moving rate of the intensifier piston is controlled by the piston control valve changing an area of a fuel line into the intensifier cylinder.
10. The fuel injection method according to claim 9, wherein the area of the fuel line into the cylinder is changed by the piston control valve during a period when the needle valve is open.
11. The fuel injection method according to claim 9, wherein when a multi-stage injection is performed in which fuel injection from the fuel injection nozzle is carried out a plurality of times per 1 cycle of an engine, a maximum area of the fuel line into the cylinder due to the piston control valve is individually set for each injection.