EP1526268A2 - Method for controlling the common rail pressure in an internal combustion engine - Google Patents

Abstract

Process for controlling the pressure in a fuel tank (200) of an internal combustion engine, especially a common rail system, comprises stationary operation of the pressure control according to a current control mode, carrying out a change-over process to change the pressure control from the current control mode to a desired future control mode in response to a control mode signal (SR), and stationary operation of the pressure control according to the desired control mode. To carry out the changeover process, the relevant control circuit (110, 120) is opened in which the control units (114, 124) are controlled with change-over input signals (u1, u2) preferably individually determined for each change-over process instead of with the previous input signal (e1, e2). The control units can be transferred in a desired manner from a current operating state defined by the current control mode into a future operating state defined by the future control mode. Independent claims are also included for: (1) Device for controlling the pressure in a fuel tank of an internal combustion engine, especially a common rail system; and (2) Computer program with program code for the device used for controlling pressure in a fuel tank.

Description

The invention relates to a method for regulating the pressure in a fuel storage of an internal combustion engine, in particular a common rail system. Furthermore The invention relates to a computer program and a Device for carrying out this method.

State of the art

From the prior art, for example from DE 199 16 100 A1 are such a method and such Device basically known. More specifically, teaches this document, at least a first and a second control circuit for regulating the pressure in one Provide fuel storage. In a first control mode Only the first control loop for regulating the Pressure used, the pressure in the Fuel storage by suitable control of a High-pressure pump is controlled as a pressure control means. Alternatively, a second control mode is provided at the pressure regulation with the help of the second control circuit via a pressure control valve, which is immediately on the fuel tank acts. Depending on Operating condition of the internal combustion engine is either the first or second control mode for pressure control used. For example, a switching operation of the first to the second control mode then take place when certain values for the speed or the injected Fuel quantity in a given operating condition of Internal combustion engine to be exceeded. For the complementary switching from the second to the first control mode are also suitable criteria Are defined.

The procedure known from the cited document when switching between two different control modes leads however, to undesirable disturbances of the rail pressure during a switching process.

Based on this prior art, it is therefore the Object of the invention, a known method for controlling of pressure in a fuel storage one Internal combustion engine and a well-known computer program and a known device for carrying out this method in such a way that the course of the rail pressure during a switching between two different ones Rule modes are not disturbed in an unacceptable manner.

This object is achieved by the in claim 1 claimed method solved. This procedure is thereby characterized in that for carrying out the switching operation open the control loops involved in the switching process be replaced by their control devices instead of the previous input signal for preferably each Changeover individually Umschalteingangssignalen be controlled, which is so are formed, that the control devices in desired way of one by the current control mode defined current operating state in one by the future rule mode defined future Operating state to be transferred.

This claimed procedure for performing a Switching from a current rule mode to a future control mode offers the advantage of that unwanted disturbances of the rail pressure during the Shifting be avoided. According to the invention this in the way that the on the switching process involved control circuits by the switching input signal in a steady way from its activated or deactivated Operating state during the current control mode in their new activated or deactivated operating state during the future control mode.

Advantages of the invention

For the realization of this homogeneous invention Switching represents the switching input signal advantageously for each Umschaltvörgang individually suitable control values.

Advantageously, in particular a control loop, the in Frame of a switching process from an activated in a deactivated operating state or vice versa changes, opens to carry out the switching process, that is, the control loop is used for the duration of the Switchover process separated. As already mentioned, the Control device of the separated loop then not more with the input signal, but with the switching input signal operated by the switching input signal represented control value at least Approximately to the last of the control device adjusted control deviations is adjusted. To this Way is as smooth as possible or homogeneous Transition from the current rule mode to the Switchover guaranteed.

Advantageously, the switching control signal is from the given control values and one on this connected rail pressure deviation formed. These Rail pressure deviation causes a correction of the fixed predetermined control values with respect to a current Pressure situation in the fuel storage 200, depending on Amount and sign of this pressure deviation the Speed with which the pressure in the Fuel storage 200 is regulated, in terms of current pressure situation there is positively influenced. The connection of the rail pressure control deviation causes in addition, that caused by the switching process Pressure deviation in the fuel tank 200 as low as possible is held.

The transitions between stationary control operation and Switching process will continue in both directions thereby smoothed or homogenized that during the switching one by the switching input signal Conditional shift of the operating point at at least the control device is monitored, the during the switching process from an activated in a deactivated operating state or vice versa replaced. It is then for homogenization purposes advantageous when the transition from the switching operation in the future control mode only then actually through Disconnecting the switching input signal and clamping the usual input signal to the regulator device completed if at least the monitored control device their activated for the future control mode or has reached deactivated operating state. in the With regard to a transition from a first to a second control mode, where only one is activated in different control circuit, it is in With a view to harmonizing the transition, if not immediately from the first to the second or from the second is switched to the first control mode, but if instead of the current first or second control mode first to the third control mode and from there to the second or first control mode is switched.

Finally, it is beneficial that during the third Control mode, while both control loops for regulation the pressure in the fuel storage are activated, the Control devices of the two control circuits each with a Input signal are fed, which not only the the respective control loop associated control deviation, but also assigned to the other control loop Control deviation represented.

The above object of the invention will continue by a device and a computer program for Performing the method according to the invention solved. The Advantages of these solutions are the same as above Reference to the claimed method advantages.

Further advantageous embodiments of the method and the Device are the subject of the dependent claims.

drawings

Figur 1

den schematischen Aufbau einer erfindungsgemäßen Vorrichtung; und

Figur 2

den schematischen Aufbau einer Management-Regeleinrichtung als Bestandteil der erfindungsgemäßen Vorrichtung

zeigt.The description is a total of two figures attached, wherein

FIG. 1

the schematic structure of a device according to the invention; and

FIG. 2

the schematic structure of a management control device as part of the device according to the invention

shows.

Description of the embodiments

The invention will hereinafter be in the form of various Embodiments with reference to Figures 1 and 2 described in detail.

FIG. 1 shows the structure of the device according to the invention 100 for regulating the pressure in a fuel storage 200 an internal combustion engine (not shown here) according to the Invention. The fuel storage is in particular a so-called common rail.

The device comprises a first control loop 110 with a first subtraction device 112 for providing a control deviation r1, a first control device 114 and a throttle valve 116 as an actuator. This first control circuit regulates via the throttle valve 116, the high-pressure pump 210 supplied Kraftstcffmenge. The first control circuit ensures that precisely the amount of fuel which is predetermined via a setpoint signal S _{M-setpoint of} the subtraction unit 112 is supplied to the high-pressure pump 210 via the throttle valve 116. For this purpose, the difference formation device 112 performs a continuous comparison between the desired fuel quantity requested by the desired quantity signal S _M-desired and the actual fuel quantity actually provided by the throttle valve 116 and represented by the actual quantity signal S _M-ist a possibly determined difference r1 between the setpoint and the actual set as quantity deviation. This quantity deviation r1 is output to the control device 114 during steady-state operation of the first control loop as a control deviation in the form of an input signal e1. As a special feature in the first control loop, it should be noted that the amount of fuel actually metered by the throttle valve 116 is not detected at the outlet of the throttle valve 116 by means of a flow meter, but instead the control variable at the output of the first control device 114 is represented as a representative of the actually set actual fuel quantity is evaluated. Due to a physically unambiguous assignment between this control variable and the actually set fuel quantity, this tap according to FIG. 1 is equally effective as a direct detection of the flow rate.

As just described, the first control loop 110 controls initially only the high pressure pump 210 supplied Fuel quantity. The high pressure pump 210 is over a fuel line 220 to the fuel storage 200th connected. About the control of the fuel tank 200 amount of fuel supplied by means of the first Control circuit can therefore indirectly also the pressure in the Fuel storage to be controlled.

In addition to the first control loop, the device 100 according to FIG. 1 furthermore comprises a second control circuit 120. This comprises a second difference-forming device 122, which represents a possible deviation between a predetermined desired pressure, represented by a signal S _D-desired and that of a. Pressure sensor 230 measured actual pressure in the fuel reservoir 200, represented by a signal S _D-actual detected. The second control circuit 120 further comprises a second control device 124 which receives the pressure deviation r2 detected by the second subtraction device 122 during stationary control operation in the form of an input signal e2 and controls a pressure control valve 126 in response to this pressure deviation r2 which is directly dependent on the pressure in Fuel tank 200 acts. In contrast to the first control loop, the second control circuit therefore carries out a direct regulation of the pressure in the fuel accumulator.

The first and second control circuits 110, 120 can be operated both individually and simultaneously, that is to say in parallel. Thus, in a first control mode only the first control loop 110 and in a second control mode only the second control loop 120 is activated, while in a third control mode the first and the second control loop 110, 120 are activated simultaneously. The decision as to which of the three aforementioned control modes the device according to FIG. 1 is operated takes place in response to a control mode signal S _R , which specifies a current or future control mode, in particular as a function of a current operating state of the internal combustion engine. It can be seen in FIG. 1 that this control mode signal S _{R is} fed to a control management device 130, in which, inter alia, preferably the two difference-forming devices 112 and 122 already mentioned are integrated.

This rule management device 130 is designed to control the respective control devices 114, 124 of the two control circuits 110, 120 in response to a respectively desired control mode represented by the control mode signal S _R.

Figure 2 shows the structure of the rule management device 130 according to the invention. The input signals of this device 130 were mentioned with reference to Figure 1; they are designated in Figure 2 with the same reference numerals. It can be seen that the rule management device 130, in addition to the two differentiation devices 120, 122, also has a memory device 132 for storing and providing predetermined control values. These control values substantially shape the switching input signals u1, u2 for the controllers 114, 124 during a switching operation. Furthermore, the rule management device 130 comprises a first and a second switching device 134, 136 for generating the first and second input signals e1, e2 for the first and the second control device 114, 124 during stationary control operation in one of the three said control modes or for generating the switching input signal u1, u2 for at least one of the control devices 114, 124 during a switching process. Finally, the rule management device 130 comprises a control device 138 for controlling the memory device 132 and the switching devices 134, 136 in response to the control mode signal S _R via control signals St1, St2 and St3.

The operation of the illustrated in Figure 2 Rule management device 130 according to the invention detailed below. It is between a stationary control operation of the device 100 in the three named rule modes and between the possible Transition operations between these rule modes distinguished.

To operate the device 100 during a first Control mode, during which the pressure in the Fuel tank 200 only with the help of the first Control loop 110 is regulated, the works Rule management device 130 as follows: In this case the controller 138 controls the first one Switching device 134 via the first control signal St1 so on that the switching device 134 at its output the Input signal e1 for the first control device 114 so trains that of the second Differentializer 112 provided Pressure deviation r2 represents. At the same time, the Control device 138, the second switching device 136th via the control signal St2 in such a way that the Switching 136, the input signal e2 for the second controller 124 based on predetermined Generated tax values. These control values become the second switching means 136 through the Memory device 132 provided after this the third control signal St3 of the control device 138 was informed about which control values from which Memory addresses within memory device 132 currently output to the second switching device 136 are. The control values are preferably so in this case predetermined that they the second controller 124 in an inactive, that is disabled state hold. Alternatively, the control values may also be a Shutdown of the second control device, preferably in cause a standby mode.

In an operation of the device 100 during the second Control mode, during which the pressure in the Fuel tank 200 only with the help of the second Control loop 120 is regulated, the works Rule management device 130 as follows. With her first and third control signal St1, St3, it controls the Memory device 132 and the first switching device 134 in an analogous manner, as the second Switching device 136 during the last paragraph described operation in the first control mode. The first Switching device 134 then generates an input signal e1 for the first controller 114 based on suitable, by the memory device 132nd provided control values. These control values are then designed to be the first control device disable or switch off. When operating in the second Control mode, the second switching means 136 through the second control signal St2 of the control device 138 so that they are the input signal e2 for the second Regulating device 124 from that of the second Differentializer 122 provided Pressure deviation r2 forms.

In the event that the device 100 in the third Regulating mode is operated during which the pressure in the Fuel tank 200 with the help of both the first and also the second control loop 110, 120 is regulated, the rule management device 130 operates as follows. The Control device 138 then controls over the first Control signal St1 the first switching means 134 so, that is the input signal e1 for the first Control device 114 based on the first Difference-generating device 112 provided Quantity deviation r1 forms. At the same time, the Control means the second switching means 136 via the second control signal St2 so that the input signal e2 for the second controller 124 based on the the second differencing means 122 provided pressure deviation r2 is formed. Advantageously, however, the input signals do not become only on the basis of the mentioned, but under additional Consideration of the other deviations r1, r2 educated.

So far, the behavior of the rule management device 130 has been described for each stationary control operation in either the first, second or third control mode. Below is the behavior of the rule management device 130 according to the invention during a switching process in which is switched from a current control mode to a future desired control mode in response to the control mode signal S _R. To carry out this switching process, the rule management device 130 is designed to open the control circuits involved in a switching process by their control device 114, 124 no longer actuated as before in stationary control operation with the input signal e1 or e2, but instead with special switching input signal u1, u2 become. These switching input signals are designed such that the control devices 114, 124 are transferred in the desired manner from a current operating state defined by the current control mode, active or passive, into a future operating state defined by the future control mode, active or passive.

The switching input signals u1, u2 are basically based suitably predetermined by the storage device 132 provided tax values. The control values are for every single possible switching between two individually determined by different control modes. At the in Figure 2 shown structure of the rule management device 130 become the first and the second switching device 134, 136 then during a switching process by the first and second control signals St1, St2 are controlled so that they the switching signals u1, u2 based on by Memory device 132 provided appropriate Generate tax values. The memory device 132 becomes in turn by the third control signal St3 instructed accordingly.

To optimize the speed with which the pressure during a switching operation in the fuel storage 200 is to be changed or regulated, it is advantageous if the switching input signals u1, u2 not only from the pure tax values are formed, but if they are formed from tax values instead, which with the current, by the second Differentializer 122 provided Pressure deviation r2 were applied. Depending on the amount and Signs of this pressure deviation soft the switching input signals u1, u2 then more or less strongly of the originally predetermined control values; in this way Not only is the speed of regulation with regard to optimized current pressure situation in fuel storage, but it is also due to the switching process caused pressure deviation kept as low as possible.

The controller 138 may be a state machine be formed, which is a monitoring of Operating points of the control device 114, 124 during a Switchover allows.

When switching from the third control mode, at which both control loops are active, at first or second control mode, in each case only one control loop is active, proceed as follows: First, both Control loops 110, 120 open by these no longer with the input signals e1, e2, but instead with the Switching Eihgangssignal u1, u2 are controlled. It Then there is a monitoring of the by the switching input signals u1, u2 conditional shift of Operating points of both control device 114, 124 in particular in terms of when when in this switching process too deactivating control device their previous effective Workspace leaves. When this time reaches is, is in the active regulatory device that previously input switching input signal u1, u2 off. The associated control loop then becomes again closed by the control device - instead of with the Switch input signal - with the selected one predetermined first or second control mode Input signal e1, e2, which one of the said Control deviations represented, is controlled.

Parallel to this is the control device to be deactivated so long continue with the switching input signal fed until this control device due to the Operating point shift has been deactivated. alternative For this purpose, the control device to be deactivated can also simply shut off.

Sie steuert über eines der Steuersignal St1, St2 zunächst nur diejenige Umschalteinrichtung 134, 136 an, die der bei dem aktuellen Regelmodus deaktivierten, aber für den zukünftigen Regelmodus zu aktivierenden Regeleinrichtung 114, 124 zugeordnet ist. Die Ansteuerung erfolgt so, dass diese Umschalteinrichtung 134 oder 136 der zu aktivierenden Regeleinrichtung ein auf geeigneten, wiederum durch die Speichereinrichtung 132 bereitgestellten Steuerwerten basierendes Umschalt-Eingangssignal u1, u2 zuführt. Es wird dann vorzugsweise wiederum über die als Zustandsautomat ausgebildete Steuereinrichtung 138 eine Verschiebung des Arbeitspunktes bei der zu aktivierenden Regeleinrichtung überwacht, um festzustellen, wann diese Regeleinrichtung überhaupt wieder in einen wirksamen Arbeitsbereich eintritt. Der Zeitpunkt des Eintritts des Arbeitspunktes in den wirksamen Arbeitsbereich ist zu unterscheiden von einem anderen Zeitpunkt, wann der Arbeitspunkt der zu aktivierenden Regeleinrichtung einen durch den zukünftigen Regelmodus geprägten Betriebspunkt repräsentiert; zwischen beiden Zeitpunkten liegt üblicherweise ein zeitlicher Abstand.

In a switching operation from a current first or second control mode, in which only one control loop is active, to the third control mode, in which both control loops 110, 120 are active, the rule management device 130 proceeds as follows:

Initially, via one of the control signals St1, St2, it only activates that switching device 134, 136 which is associated with the control device 114, 124 deactivated in the current control mode but to be activated for the future control mode. The control takes place such that this switching device 134 or 136 of the control device to be activated supplies a switching input signal u1, u2 based on suitable control values, again provided by the memory device 132. In turn, it is then preferably monitored via the control device 138, which is designed as a state machine, to shift the operating point in the control device to be activated in order to determine when this control device will even reenter an effective working area. The time of entry of the working point into the effective working range is to be distinguished from another time when the operating point of the control device to be activated represents an operating point characterized by the future control mode; between the two times is usually a time interval.

Once it has been determined that the to be activated Control device in the effective work area is also the one control device that both in the current and in the future desired control mode is activated and so far with the input signal e1, e2 of the current control mode is cut off from this input signal and instead with the same toggle input signal u1, u2 fed as the regulating device to be activated. Both Control device are then as long as preferably the same switching input signal until both Control devices in such an active operating state have been convicted, as he desired for the future Control mode is provided.

Switches from the first to the second control mode or vice versa are preferably not by a direct Switching between these control modes realized. A such direct switching would disadvantageously severe disturbances of the rail pressure during the Switchover result. Therefore, according to the invention proposed a detour in such switching operations via the third control mode. Specifically means this, that at a switching from the first to the second control mode, first a Umschaltvcrgang of the first on the third and subsequently a switching process should be made from the third to the second control mode. Similarly, a switching operation of the second control mode to the first control mode realized by that first from the second to the third and subsequently from the third is switched to the first control mode. These described switching operations involving the third control mode preferably carried out as above described.

The control device 138 is designed to be suitable for each of the said switching operations the Memory device 132 and the first and second Switching means 134, 136 via the control signals St1, St2 suitably controls, in particular the switching input signals u1, u2 to realize in a suitable manner.

The described method according to the invention is preferably realized in the form of a computer program. The computer program may together with other computer programs on a computer readable Storage medium to be stored. The disk may be to a floppy disk, a compact disc or a act as flash memory. That on the disk stored computer program can then as a product to transfer or sell to a customer. The However, computer program can also without the help a data carrier via an electronic Communication network, especially the Internet, as Product to the customer.

Claims (18)

Method for regulating the pressure in a fuel reservoir (200) of an internal combustion engine, in particular a common rail system, comprising the steps: a) stationary operation of the pressure control according to a current control mode; b) performing a switching operation for switching the pressure control from the current to a future desired control mode in response to a control mode signal (S _R ); and c) stationary operation of the pressure control according to the future control mode; wherein in each control mode one or more different control circuits (110, 120) are activated to control the pressure; and wherein at each steady-state operation of a control loop, a control device (114, 124) individually assigned to each control loop is controlled with an input signal (e1, e2) representing a control deviation;
characterized in that for carrying out the switching operation in step b) involved in the switching control loops (110, 120) are opened by their control devices (114, 124) instead of the previous input signal (e1, e2) with preferably for each switching individually predetermined switching input signals (u1, u2) are designed, which are designed so that the control devices (114, 124) are converted in a desired manner from a current operating mode defined by the current control mode in a future operating mode defined by the future control mode. A method according to claim 1, characterized in that the switching input signals represent predetermined, in particular constant control values, which are individually dimensioned depending on the desired switching operation. A method according to claim 2, characterized in that the switching signals in each case also considered a current rail pressure deviation in addition to the control values. Method according to one of the preceding claims, characterized in that the transfer of the control devices (114, 124) from the current to the future operating state based on a by the switching input signals (u1, u2) caused shift of the operating point of the respective control device (114, 124 ) is monitored. Method according to one of the preceding claims, characterized in that a first, a second and a third control mode are alternatively available, wherein in the first control mode only a first control loop (110), in the second control mode only a second control loop (120) and in the third control mode, both the first and second control circuits (110, 120) are activated to control the pressure. A method according to claim 5, characterized in that in a switching operation from the third to the first or second control mode, the method comprises the following sub-steps: b1.1) opening of the first and second control circuits by controlling both the control device (114, 124) to be deactivated in the context of the switching process and instead of the input signals (e1, e2) from the current stationary control operation, preferably with the same the switching input signals (u1, u2) representing the predetermined control values; b1.2) monitoring the shifting of the operating points of both control devices (114, 124) caused by the switching input signals (u1, u2) and carrying out the following steps when the control device to be deactivated leaves its effective operating range hitherto: b1.3) switching off the previous, the predetermined control values representing switching input signal (u1, u2) in the active permanent loop (110, 120) and closing this loop by driving its control device with another, according to step c) and the selected future first or second control mode given input signal, which represents a control deviation; b1.4) continuing to drive the control device (114, 124) of the control loop to be deactivated with the changeover input signal (u1, u2) until its control device (114, 124) has been deactivated due to the operating point shift; and during method step c): maintaining the deactivated control loop in the deactivated state either by further suitable control with the switching input signal (u1, u2) or by switching off this control circuit, preferably in a stand-by mode. A method according to claim 5, characterized in that a switching process according to method step b) from the current first or second control mode to the third control mode, the method comprises the following sub-steps: b2.1) activating the control device (114, 124) previously deactivated in the current control mode but to be activated for the future control mode with a suitable changeover input signal (u1, u2); b2.2) monitoring the actuation-related shift of the operating point of the control device of the control loop to be activated in order to determine when the previously deactivated control device again enters an effective working area; b2.3) Continuing the activation of the regulating device (u1, u2) to be activated with the switching signal (u1, u2) beyond the time of the determination according to step b2.2) and at the same time opening the control circuit activated during the current and the future control mode ( 110, 120) by driving its control device (114, 124) with preferably the same switching signal (u1, u2), as the control device to be activated, respectively, until both control devices in an active operating state, as provided for the future desired third control mode is, have been convicted. Method according to at least one of the preceding claims, characterized in that a transition from the current control mode 1 to a future control mode 2 according to step b) comprises the following substeps: Performing a switching operation from the current control mode 1 to the control mode 3 according to claims 1 and 7; and Performing a switching operation from the control mode 3 to the future control mode 2 according to claims 1 and 6. Method according to at least one of the preceding claims 1 to 7, characterized in that a transition from the current control mode 2 to a future control mode 1 according to step b) comprises the following substeps: Performing a switching operation from the current control mode 2 to the control mode 3 according to claims 1 and 7; and Performing a switching operation from the control mode 3 to the future control mode 1 according to claims 1 and 6. Method according to one of the preceding claims, characterized in that in operation according to the third control mode, the input signals (e1, e2) for both control devices (114, 124) each not only a control loop associated with the own control loop, but also a control loop associated with the other control loop represent. Apparatus (100) for controlling the pressure in a fuel reservoir (200) of an internal combustion engine, in particular in a common rail system, according to one of a plurality of available control modes which can be switched from a current to a future control mode in response to a control mode signal (S _R ) are, comprising: at least one first and one second control loop (110, 120) each having a subtraction device (112, 122) for providing a control deviation (ri, r2) and in each case with a control device (114, 124) for regulating the pressure in the fuel accumulator (200) during stationary control operation in response to an input signal (e1, e2) which represents at least one of the control deviations (r1, r2), wherein, depending on the currently set Control mode of the first and / or the second control loop (110, 120) is activated; marked by
a rule management device (130) comprising the difference means (112, 122) and further adapted to generate a first and a second switch input signal (u1, u2) from predetermined control values in response to the control mode signal (S _R ) and the first one and to control the second control device (114, 124) with the switching input signals (u1, u2) during a non-steady-state switching operation triggered by the control mode signal in such a way that the control devices deselect as desired by the current one Control mode defined current operating state can be converted into a defined by the future control mode future operating state. Apparatus according to claim 11, characterized in that
the first control circuit (110) has, in addition to the first control device (114), a throttle valve (116) as an actuator for adjusting that amount of fuel which is fed to a fuel pump (210) connected to the fuel reservoir (200) for pumping fuel into the fuel reservoir (200) becomes; a first of the two subtraction devices (112) is designed to provide a first control deviation (r1) in the form of a quantity deviation between the fuel quantity currently provided by the throttle valve (116) as the actual quantity and a predetermined setpoint fuel quantity; and
the first control device (114) is designed to indirectly regulate the pressure in the fuel accumulator (200) during stationary control operation by suitably actuating the throttle valve (116) in response to the input signal generated by one of the control means (130) associated with the first switching device (134) (e1), which represents at least the quantity deviation. Apparatus according to claim 11 or 12, characterized in that
the second control circuit (120) has, in addition to the second control device (124), a pressure regulating valve (120) connected to the fuel accumulator as an actuator;
the second of the two differencing means (122) is adapted to provide a pressure deviation (r2) between the actual pressure in the fuel reservoir (200) and a predetermined target pressure; and the second controller (124) is configured to directly regulate the pressure in the fuel accumulator (200) during stationary control operation via the pressure control valve (126) in response to the second input signal generated by the second switching means (136) associated with the control management means (130) (e2), which represents at least the pressure deviation. Apparatus according to claim 13, characterized in that during a first control mode during which the pressure in the fuel reservoir (200) is controlled only by means of the first control circuit (110),
the first switching device (134) is designed to form the input signal (e1) for the first control device (114) in response to a first control signal (St1) of a control device (138) assigned to the control management device (130) in such a way that it corresponds to that of the second control device Differing means (122) represents provided pressure deviation (r2), and
the second switching device (136) is configured to form the input signal (22) for the second control device (124) in response to a second control signal (St2) of the control device (138) on the basis of at least one of the predetermined control values such that the control device () 124) of the second control circuit (120) remains deactivated or is switched off. Apparatus according to claim 13, characterized in that during a second control mode during which the pressure in the fuel reservoir (200) is controlled only by means of the second control circuit (120),
the first switching means (134) is adapted to receive the input signal (e1) for the first control means (114) in response to a first control signal (St1) from a control means (138) associated with the rule management means (130) based on at least one of the predetermined control values form that the control device (114) of the first control circuit (110) remains deactivated or is switched off; and
the second switching means (126) is adapted to form the input signal (e1) for the second control means (124) in response to a second control signal (St2) of the control means (138) to provide a current one provided by the second differencing means (122) Pressure deviation (r2) represents. Apparatus according to claim 13, characterized in that during a third control mode, during which the pressure in the fuel reservoir (200) is regulated by means of the first and second control circuits (110, 120), the first switching device (134) is designed to receive the input signal ( e1) for the first control device (114) in response to a first control signal (St1) of a control means (138) associated control means (138) so as to represent a control deviation, which provided by the first subtraction means (112) current quantity deviation (r1) and at the same time also reflects the current pressure deviation (r2) provided by the second differencing means (122); and
the second switching device (136) is designed to also design the input signal (e2) for the second control device (124) in response to a second control signal (St2) of the control device (138) in such a way that it represents a control deviation which represents the current pressure deviation ( r2) and the current quantity deviation (r1). Device according to one of claims 14 to 16,
characterized in that the control device (138) is formed, at least during a by the control mode signal (S _R ) initiated switching operation, by the control of the control devices concerned (114, 124) with the switching signals (u1, u2) conditional shift of the operating point and to generate the control signals (St1, St2) for controlling the first and second switching means (134, 136) in response to the detected desired shift of the operating points. Computer program with program code for a device for regulating the pressure in a fuel storage (200),
characterized in that the program code is adapted to carry out the method according to one of claims 1-10.

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