WO2004042201A1

WO2004042201A1 - Arrays for controllable power supply of electrovalves of an electrohydraulic valve control

Info

Publication number: WO2004042201A1
Application number: PCT/DE2003/001718
Authority: WO
Inventors: Hubert Schweiggart; Ulf Pischke; Hermann Gaessler
Original assignee: Robert Bosch Gmbh
Priority date: 2002-11-02
Filing date: 2003-05-27
Publication date: 2004-05-21
Also published as: US20060137633A1; EP1585890A1; DE10251034A1; JP2006504897A

Abstract

The invention relates to an array for controllable power supply of electrovalves of an electrohydraulic valve control of an internal combustion engine, wherein the actuator of the charge cycle has electrovalves assigned thereto. A two-stage power supply for the electrovalves is provided, namely the supply with a breakaway starting voltage provided by a breakaway starting voltage source and the supply with a withstand voltage provided by a withstand voltage source. The breakaway starting voltage is greater than the withstand voltage. The electrovalves are operated independently of one another during the breakaway starting current period with a corresponding breakaway starting current as a result of the breakaway starting voltage being applied and during a withstand current period with a corresponding withstand current as a result of the withstand voltage being applied. Each electrovalve is provided with a withstand voltage line and a breakaway starting voltage line, which connect the electrovalve to the withstand voltage source or the breakaway starting voltage source. A grounding line connects each electrovalve to the ground, wherein a ground disconnector is arranged in each grounding line for switchable disconnection of the electrical connection between the electrovalve and the ground.

Description

ARRANGEMENTS FOR THE CONTROLLABLE SUPPLY OF SOLENOID VALVES OF AN E-

LE TROHYDRAULIC VALVE CONTROL

The present invention relates to an arrangement for the controllable supply of solenoid valves of an electro-hydraulic valve control of an internal combustion engine with current.

In known electrohydraulic valve controls, gas exchange actuators are assigned to solenoid valves. The energization of the solenoid valves serves to control the flow of hydraulic oil to and from the gas exchange actuator. It is known to provide a two-stage power supply for the solenoid valves. A pull-in voltage is provided by a pull-in voltage source and a holding voltage is provided by a holding voltage source, the pull-in voltage being greater than the holding voltage. The actuation of the solenoid valve by applying the pull-in voltage leads to a rapid acceleration of the valve body. This reduces the valve's inertia. After one following the actuation with the tightening voltage

Free flight phase, the solenoid valve is operated with the holding voltage. The holding voltage is sufficiently large to bring the valve body safely into the actuating end position of the valve and to hold it there. Compared to the pull-in voltage, however, the power consumption in the holding phase is lower. This also results in less self-heating of the valve. The solenoid valves can be actuated independently of one another over a pull-in current time with a pull-in current corresponding to the application of a pull-in voltage and over a holding current time with a holding current corresponding to the application with a holding voltage. The duration of the actuation of the solenoid valve thus results from the pull-in current time, the subsequent time for the free flight phase and the holding current time. The magnetic 0.

valve can be designed both as a closer and as an opener. If the solenoid valve is designed as a closer, the valve interrupts a fluid path when it is energized, while a valve designed as an opener releases a fluid path when it is actuated. A holding voltage line and a pull-in voltage line are provided for each solenoid valve, the holding voltage line connecting the solenoid valve with the holding voltage source and the pull-in voltage line connecting the solenoid valve with the pull-in voltage source. In addition, a ground line leading from the solenoid valve to the ground is provided, in each of which has a ground isolating switch for disconnecting the electrical connection between the solenoid valve and ground.

In such an embodiment, in addition to the ground isolating switch, a changeover switch is also required for each solenoid valve, which alternatively connects the solenoid valve to the pull-in voltage line or to the holding voltage line.

The solenoid valves assigned to this gas exchange valve are actuated to actuate a gas exchange valve. To actuate a solenoid valve, the controlled actuation of the changeover switch and the ground isolating switch is required. The energization of the corresponding solenoid valve is switched via the ground isolating switch, while the pull-in voltage or the alternately is switched over via the changeover switch

Holding voltage is applied to the solenoid valve.

A gas exchange valve is usually controlled by two solenoid valves, one determines the supply of hydraulic fluid to a working chamber, the other solenoid valve the outlet of the hydraulic fluid from the working chamber. Assigns one

Brennlα-aftmaschme four gas exchange valves (each two intake and exhaust valves) per cylinder, so only eight solenoid valves and thus sixteen separately controllable switches are required to control one cylinder. A corresponding number of control signals for actuating the solenoid valves must be generated synchronously with the movement of the crankshaft.

In contrast, it is an object of the invention to reduce the circuitry and the effort required for the control.

This object is achieved by an arrangement according to the invention. An arrangement for the controllable supply of solenoid valves of an electrohydraulic valve control of an internal combustion engine with current has solenoid valves assigned to the gas exchange actuators. A two-stage voltage supply is provided for the solenoid valves, namely the supply with a starting voltage provided by a pull-in voltage source and the supply with a holding voltage provided in a holding voltage source. The holding voltage is greater than the tightening voltage. The solenoid valves are independent of one another over a pull-in current time with a corresponding pull-in current due to the application of the holding voltage and over a holding current time with one due to the

Actuation can be actuated with the appropriate holding current. For each solenoid valve, a pull-in voltage line and a holding voltage line are provided, which connect the solenoid valve with the pull-in voltage source or with the holding voltage source. A ground line leads from each solenoid valve to ground, with a ground isolating switch to the switchable in the ground line

Interrupting the electrical connection between the solenoid valve and ground is arranged.

According to the invention, a solenoid valve group is formed from a plurality of solenoid valves. Pulling voltage lines leading to the solenoid valves of a solenoid valve group have a common pulling voltage line section and in the common pulling voltage line section a voltage isolating switch is arranged for the switchable establishment of the electrical connection between pulling voltage source and the solenoid valves of the solenoid valve group.

This measure ensures that only a single switchable voltage isolating switch is provided for the solenoid valves of the solenoid valve group to establish the connection with the pull-in voltage. This voltage isolating switch replaces the changeover switches available for each valve. If the voltage isolating switch is switched on, the pull-in voltage is applied to all solenoid valves in the solenoid valve group. The actual energization of the solenoid valve with the pull-in current resulting from the pull-in voltage takes place through the actuation of the ground isolating switches individually assigned to the solenoid valves. A solenoid valve is energized with pull-in current when the voltage isolating switch of the corresponding solenoid valve group is closed and at the same time the corresponding mass isolating switch of the solenoid valve is also closed. is. Due to the presence of the ground isolating switch, the solenoid valves within the solenoid valve group can still be controlled individually.

The number of switchable switches required can thus be reduced by the invention. In accordance with the reduction in the number of switchable switches, the control effort for the switches is also reduced. Due to the presence of a common pull-in voltage line section, wiring effort is also reduced.

According to an advantageous embodiment of the invention, the holding voltage line is designed for the permanent supply of the solenoid valves to at least one solenoid valve group with holding voltage. The holding voltage lines leading to the solenoid valves have a common holding voltage section. This measure reduces the wiring effort.

According to a further embodiment, it is provided that the voltage isolating switch of a solenoid valve group connects the common pull-in voltage section to the common holding voltage section of this solenoid valve group in a contact point. In this case, a blocking diode is provided in the common holding voltage section between the holding voltage source and the node, which feeds the current flow from the node to the holding voltage point. From the node to the solenoid valves of the

Solenoid valve group has a common line for supplying the corresponding solenoid valve with pull-in voltage and with holding voltage. This measure also serves to further reduce the wiring effort. The supply with pull-in voltage and with holding voltage can partly be carried out via the same line. If the voltage isolating switch of a solenoid valve group is interrupted, the holding voltage is applied to the solenoid valves. If the voltage isolating switch is closed, the pull-in voltage is applied to the solenoid valves. The diode between the holding voltage source and the node source prevents a current flow from the pull-in voltage source to the holding voltage source and thus prevents an undesired shunt. This measure also serves to reduce the amount of wiring or wiring required.

The solenoid valves of a solenoid valve group are energized with the pull-in current resulting from the pull-in voltage when the voltage isolating switch is closed and, at the same time, the mass transfer switch assigned to the individual valve is likewise closed is. An actuation of a solenoid valve with the holding current resulting from the holding voltage occurs when the voltage isolating switch of the solenoid valve group is disconnected and the mass isolating valve assigned to the corresponding solenoid valve is closed.

According to an advantageous embodiment of the invention, the solenoid valves of a solenoid valve group are selected such that the pull-in voltage actuation times do not overlap with the holding voltage actuation times. This measure ensures that if a solenoid valve of the solenoid valve group has to be supplied with a pull-in voltage, another valve does not have to be supplied with a holding voltage.

Alternatively, either the pull-in voltage or the holding voltage is present on the voltage supply side of the solenoid valves. If there is no overlap between the holding current times and the pull-in current times, the voltage level currently required can be applied to the voltage side of the solenoid valves by suitable actuation of the voltage isolating switch.

The opening ranges of the gas exchange valves over the crankshaft angle are a maximum of 240 ° crankshaft angle in a classic valve train. This takes into account both opening times of the intake and exhaust valves. The proportion of an engine play above 720 ° crankshaft angle is therefore a maximum of 33%, so that it is easily possible to combine several solenoid valves into a solenoid valve group without corresponding overlaps occurring.

According to an advantageous embodiment of the invention, it is provided that the mass separation switch can be switched in a clocked manner by solenoid valves. In this case, the duty cycle is in particular designed such that when the supply voltage is supplied with voltage, the mean current flow resulting from the clocking corresponds to the holding current resulting from the application of the folded voltage. By means of the clocked circuit of the ground isolating switch, current can also be generated with a current corresponding to the holding current if the pull-in voltage is present on the voltage supply side. This

The measure is particularly advantageous if there is an overlap between the tightening voltage actuation times and the holding voltage actuation times within the solenoid valves assigned to a solenoid valve group. However, it can also be used to reduce the number of switching operations of the voltage isolating switch and in some cases also apply the pull-in voltage on the voltage supply side to leave if only a supply with holding voltage would actually be required. According to a further advantageous embodiment of the invention, each solenoid valve has a return line on the mass connection side, which connects the mass connection of the solenoid valve to the pull-in voltage source. In this case, a diode is connected in the return line which spends a current flow from the starting voltage source to the ground connection of the solenoid valve.

This embodiment of the invention has the advantage that the currents flowing in the coil of a solenoid valve can be rapidly reduced after opening the ground isolating switch. Put simply, the current is fed back to the pull-in voltage source via the return line. The diode arranged in the return line prevents a current flow from the pull-in voltage source via the return line to the solenoid valve and from there to the holding voltage source. If a solenoid valve was actuated with a pull-in switch because the voltage isolating switch was closed, the decaying coil current can flow back to the pull-in voltage source after opening the ground isolating switch. The so-called free-flight phase or free-running is formed between the application of the pull-in current or the holding current to the solenoid valve. In this freewheeling phase, the earth isolator of the corresponding solenoid valve is open. In the same way, a quick extinction and thus a rapid backward movement of the solenoid valve are formed at the end of the holding phase specified by the holding current time. If the earth isolating switch of a solenoid valve is opened when a holding voltage is applied, the remaining coil current can only be returned to the voltage source via the return line, which is at a higher potential than the holding voltage source. This results in a rapid reduction in the coil current.

According to an advantageous embodiment of the invention, first and second solenoid valves are provided, the first solenoid valves being closed when de-energized and the second solenoid valves being open when de-energized. Each gas exchange actuator preferably has a first and a second solenoid valve. Each cylinder of the internal combustion engine in particular has at least one intake valve and at least one exhaust valve, each of the intake and exhaust valves being actuable by means of a gas exchange actuator. With this arrangement, a full electro-hydraulic valve actuation is generated. According to a preferred embodiment of the invention, all the solenoid valves of the gas exchange actuators assigned to a cylinder of the internal combustion engine are combined to form a solenoid valve group.

By combining all the solenoid valves, which are assigned to a cylinder via their assignment to the gas exchange actuators, to form a solenoid valve group, a solenoid valve group is formed in which it is ensured that there is no overlap between the actuation times with the starting voltage and the holding voltage of the solenoid valves.

Such an arrangement enables valve control free of overlap time, even with internal combustion engines with a large number of cylinders, with a reduced number of control elements and reduced control effort.

According to one embodiment of the invention, it is provided that for at least two cylinders of the internal combustion engine, the solenoid valves assigned to the intake valves are combined to form a first solenoid valve group and the solenoid valves assigned to the exhaust valves to form a second solenoid valve group. Compared to a solution in which all the solenoid valves of a cylinder of the internal combustion engine are combined to form a solenoid valve group, this enables a further reduction in the

Number of controllable switches and the corresponding effort on control lines can take place without overlap times occurring. For example, in a four-cylinder engine that has two exhaust valves and two intake valves with two solenoid valves on each cylinder, 32 mass isolating switches and also 32 changeover switches between the

Tightening voltage source and the holding voltage source required. If the four solenoid valves of the inlet valves and the four solenoid valves of the outlet valves are combined to form a solenoid valve group, only two voltage isolating switches are required compared to the eight changeover switches previously required; the number of corresponding switches and the required diodes is also reduced accordingly.

If all eight solenoid valves, the inlet valves and eight solenoid valves, which are assigned to the cylinder's exhaust valves, are combined to form a solenoid valve group for two cylinders, only 1/8 of the voltage isolating switch and any diodes present in return lines are required. A further reduction in the construction work objection. If the solenoid valves of two cylinders are combined to form solenoid valve groups, a further reduction in the construction effort can be achieved. Under certain circumstances, however, it must be accepted that overlap times occur in which it would be necessary on the one hand to supply a solenoid valve of a solenoid valve group with pull-in voltage and on the other hand to supply another solenoid valve of the same solenoid valve group with holding voltage. The combination of three suitably selected cylinders of a 6-cylinder engine to form a solenoid valve group can, however, still be carried out without or with only very short overlap times. If overlap times occur, it must be possible to switch the ground isolating switch in cycles for these periods. Nevertheless, the advantages of cost reduction in the number of diodes required and the required voltage isolating switches can outweigh the disadvantages of the clocked switching of the ground isolating switches that is therefore required in such an embodiment.

According to an advantageous development of this embodiment of the invention, the at least two cylinders are selected from the cylinders of the internal combustion engine in such a way that there is no overlap of the tightening voltage actuation time with the holding voltage actuation time within the solenoid valve group.

According to an advantageous embodiment of the invention, a cylinder group is formed from a plurality of cylinders of the internal combustion engine. For a cylinder group, all first - that is, normally closed - solenoid valves of the emission valves become a first solenoid valve group and all first - that is, normally closed - solenoid valves of the exhaust valves become a second solenoid valve group and all second, that is, normally closed closed solenoid valves of the gas exchange valves to a third solenoid valve group summarized. Typically, a gas exchange actuator, that is, an inlet valve or an outlet valve, has a first solenoid valve that is closed when de-energized and that regulates the inflow of pressurized hydraulic fluid into the working chamber of the hydraulic actuator. A second, normally open solenoid valve is arranged on the outlet side of the hydraulic actuator. This design ensures that the working chamber of the gas exchange actuator is depressurized when the solenoid valves are de-energized. Here, all cylinders of a Brennlσaftmaschme can be combined into a cylinder group. According to an alternative embodiment, however, it can also be provided that at least two cylinder groups are formed. Then a cylinder group contains all cylinders of a cylinder bank. Another configuration sees that at least two cylinder groups are each formed by a plurality of cylinders, the cylinders of each cylinder group being selected such that there is no overlap of the tightening voltage actuation time and holding voltage actuation time within the solenoid valve groups of the cylinder groups. Each cylinder group preferably contains the same number of cylinders ,

Such an embodiment of the invention allows a large number of solenoid valves to be combined to form a solenoid valve group without an overlap of pull-in voltage actuation times and holding voltage actuation times. In a four-cylinder engine, for example, all eight of the first solenoid valves can

Inlet valves and all eight first solenoid valves of the exhaust valves and all sixteen second solenoid valves of all gas exchange actuators are combined to form a solenoid valve group. For a four-cylinder internal combustion engine, therefore, it only requires three voltage isolators and only three decoupling diodes between the holding voltage and the starting voltage. Together with the 32 mass switches that are then given, only 35 switches are required in such a four-cylinder internal combustion engine and only 35 control signals have to be generated. This also considerably reduces the necessary number of Tim g channels on the part of the control device and the effort required within the computing unit of the control device

According to a breathable embodiment of the invention, it is also possible to completely dispense with a holding voltage source. This means that the device manages with a single voltage source. The effort is further reduced. This is achieved according to the invention in that the voltage isolating switch is switched in a clocked manner to provide the holding voltage, the duty cycle being selected between the holding voltage and the pull-in voltage according to the vehicle ms. The solenoid valves of a solenoid valve group are to be selected in such a way that there is no overlap between pull-in voltage actuation times and holding voltage actuation times

Otherwise, further designs of this embodiment correspond to the designs of the corresponding solenoid valve group with regard to the combination of the solenoid valves into solenoid valve groups in the presence of a holding voltage source. Otherwise, the invention is explained in more detail below on the basis of the exemplary embodiments illustrated in the drawing, in which case:

1 shows the arrangement according to the invention for the control of four magnetic valves which are assigned to two gas exchange actuators;

2 shows a schematic representation of the formation of a solenoid valve group from all the solenoid valves assigned to the gas exchange valves of a cylinder;

3 shows a schematic representation of an embodiment with two valve groups, the first valve group combining the solenoid valves of intake valves and the second valve group combining the solenoid valves of exhaust valves of two cylinders; and

Fig. 4 shows a schematic representation of an arrangement in which the first solenoid valves and second solenoid valves of gas exchange actuators in different solenoid valve groups are summarized.

1 shows the circuit arrangement according to the invention in an exemplary manner for two gas exchange valves Z1E1, Z1E2. 2 to 4 are simplified compared to the circuit arrangement shown in FIG. 1 in that the common line routing of the holding voltage line and the pull-in voltage line via common line sections and the return line with the diode arranged therein are no longer shown. 2 to 4 serve only to illustrate the combination of the solenoid valves of the individual gas exchange actuators into solenoid valve groups. The connection and the use of common line sections are possible in the embodiment according to FIGS. 2 to 4 in the same way as in FIG. 1.

In the following description of the figures and in the figures, U _A denotes the starting voltage and U _H the holding voltage source. The gas exchange actuators are labeled with regard to their properties as an intake valve or as an exhaust valve and their assignment to cylinders, and each is shown schematically. Their designation consists of the prefix Z followed by a number to designate the cylinder to which they are assigned, the following letter E or A, which designates the assignment to the intake and exhaust valves of the corresponding cylinder. net and a subsequent number that differentiates the intake valves or exhaust valves of a cylinder from each other. 1 to 4, an internal combustion engine is assumed which has two intake and two exhaust valves for each cylinder. Each gas exchange actuator is assigned a first solenoid valve, designated M1, and a second solenoid valve, designated M2.

1 shows an arrangement in which the two inlet valves Z1E1 and Z1E2 of the first cylinder ZI each have a first solenoid valve M1 and a second solenoid valve M2. The two first solenoid valves M1 and the two second solenoid valves M2 are combined to form a valve group. Each of the solenoid valves M1, M2 is one

Ground disconnector assigned, which is arranged in the electrical connection of the respective solenoid valve Ml, M2 to ground 12. A holding voltage line 14 leads from a node point 13 to one of the solenoid valves M1, M2, so that each of the solenoid valves is connected to the node point 13 via a holding voltage line section 14. A diode 16 is between the node 13 and the withstand voltage source

U _H switched such that it prevents current flow into the holding voltage source U _H. In addition, a common pull-in voltage section 17 leads to the node, which connects the node 13 to the pull-in voltage source U _A via a controllable voltage isolating switch 18. A return line 20 leads from the ground-side connection 19 of a magnetic valve M1, M2 back to the pull-in voltage source U _A , whereby line sections can also be used here. A diode 21 is arranged in each return line 20, which returns a short-circuit current from the pull-in voltage source U _A to ground 12 via the ground isolating switch 11 or from the pull-in voltage source U _A via the feedback line 20 and the corresponding solenoid valve M1, M2 and the holding voltage disconnector 14 Junction 13 prevented.

To energize a solenoid valve within a half bridge, it is necessary to close the voltage isolating switch 18 and the earth isolating switch 11 assigned to the solenoid valve M1, M2. Closing the voltage isolating switch 18 alone does not result in a current flow through a solenoid valve M1, M2. It is thus possible to connect all the solenoid valves in the group to one voltage switch 18 of the solenoid valve group. The solenoid valves M1, M2 can only be energized only by closing the ground isolating switch 11. The suit Spann ^'clothes is switched on via the voltage isolation switch 18, to start up dynamically to the solenoid valves. However, the tightening voltage should only be effective until the valve armature accelerates. After a free-running phase, the transition to a holding current is then required in order to hold the solenoid valve at a specific opening. On the one hand this means an energy saving and on the other hand it prevents the solenoid valves from overheating. The solenoid valve current can be reduced either by opening the ground isolating switch 11 associated with the solenoid valve or by opening the voltage isolating switch 18. In order to energize a solenoid valve M1, M2 with a holding current which results when the holding voltage is present, the voltage isolating switch 18 is opened, unless the pull-in voltage is required for another solenoid valve. The holding voltage U _H is then applied to the solenoid valves on the voltage input side. By closing the ground isolating switch 11, the current supply to the corresponding solenoid valve is then achieved with the holding current.

Order an overlap between the energization with holding current of a solenoid valve Ml, M2 with the energization with a pull-in current, which is given when the pull-in voltage U _{A is present} at the voltage-side end of the solenoid valve Ml, M2, of another solenoid valve Ml, M2 of the same valve group clocked activation of the mass isolating switch 1 1 of the solenoid valve Ml, M2, which is to be operated with the holding current, with the voltage isolating switch 18 closed, an appropriate average stiOiii flow is generated at the holding current. The pulse duty factor between the closed and open mass tripping switch corresponds to the ratio of the holding voltage to the pull-in voltage.

If the diode 16 and the holding voltage source U _{H are} dispensed with, there is an alternative embodiment of the invention. In this case, the holding voltage is achieved by switching the voltage isolating valve 18 accordingly. The duty cycle of the switching corresponds to the ratio between the holding voltage and the pull-in voltage. In this case, there must be no overlap between the pull-in voltage actuation times and the holding voltage actuation times.

2 shows a simplified schematic illustration of the grouping of the solenoid valves M1, M2 of the two inlet valves Z1E1 and Z1E2 and of the two outlet valves Z1A1 and Z1A2 of a first cylinder ZI to form a common valve group. In the Drawing is, as in the further FIGS. 3 and 4 of the gas exchange actuator ZlEl, Z1E2, ZI AI, ZI A2 each shown below the two solenoid valves Ml, M2 assigned to it. Each of the solenoid valves M1, M2 of the solenoid valve group is assigned a ground isolating switch 11 to ground 12. The common holding voltage section 15 and the holding voltage sections 14 lead from the holding voltage source U _H to the

Solenoid valves Ml, M2. In this case, the diode 16 is arranged in the common holding voltage section 15 and blocks the current flow against the holding voltage source U _H.

3 shows an embodiment of the invention in which the inlet valves ZlEl, Z1E2, Z2E1 and Z2E2 of the two cylinders ZI and Z2 are combined to form a first valve group and are therefore connected to the first voltage isolating switch 18a, while the solenoid valves Ml, M2 the exhaust valves Z2A1, Z2A2, Z1A1 and ZI A2 of the two cylinders ZI and Z2 are combined to form a second valve group and are connected to the second voltage isolating switch 18b. The two voltage isolators are connected to the pull-in voltage source U _A. Each solenoid valve group is also connected to the holding voltage source U _H , a separate holding voltage source U _{H being} shown in the drawing for the sake of simplicity for each cylinder ZI, Z2, each of which is protected by a diode 16 against current backflow from the solenoid valves M1, M2. Each of the solenoid valves has an earth disconnector 11 assigned to it, which is used for the switchable manufacture of the electrical ones

Connection to ground 12 is used.

FIG. 4 shows a further embodiment, in which the solenoid valves M1, M2 are combined to form three valve groups that are different from one another, with the respectively assigned voltage isolating switches 18a, 18b, 18c. The embodiment of FIG. 4 is shown for two cylinders ZI, Z2, which have the gas exchange valves ZlEl, Z1E2, Z1A1, Z1A2, Z2E1, Z2E2, Z2A1 and Z2A2. In the arrangement according to FIG. 4, further cylinders can be added to the valve groups in the same way. For the sake of clarity, the drawing was only shown for two cylinders ZI, Z2. In the embodiment shown in FIG. 4, the first solenoid valves M1 are assigned to different solenoid valve groups than the second solenoid valves M2. The second solenoid valves M2 of all gas exchange valves ZlEl, ... Z2A2 are combined to form a common valve group which is connected to the pull-in voltage source via the third voltage isolating switch 18c. In addition, the first solenoid valves Ml of the inlet valves ZlEl, Z1E2, Z2E1 and Z2E2 are combined to form a second valve group holds and connected to the pull-in voltage source with the second voltage isolating switch 18b. The third valve group is formed from the first solenoid valves Ml of the exhaust valves ZlAl ... Z2A2 and are connected to the first voltage isolating switch 18a with the starting voltage source.

For the rest, the embodiment of FIG. 4 corresponds to the previously described embodiments.

Claims

Expectations

1. Arrangement for the controllable supply of solenoid valves of an electrohydraulic valve control of a Brennlσaftmaschine with electricity, wherein a gas exchange actuator solenoid valves are assigned, with "a two-stage voltage supply for the solenoid valves, namely with a pull-in voltage provided at a pull-in voltage source and a holding voltage provided in a holding voltage source, the Tightening voltage is greater than the withstand voltage;

^■ wherein the solenoid valves are independently of one another via a pull-in current period of time with a result of the application of pull-in voltage corresponding pull-in current and a holding current period of time due to exposure to a holding voltage corresponding to the holding current operable

^■ one pull-in voltage line and one holding voltage line for each solenoid valve, the pull-in voltage line connecting the solenoid valve to the pull-in voltage source and the holding voltage line connecting the solenoid valve with the holding voltage source;

^{■ in} each case one ground line leading from the solenoid valve to the ground, each of which has a ground isolating switch for disconnecting the electrical connection between the solenoid valve and ground; characterized in that

^■ is formed of a plurality of solenoid valves (M1.M2) is a solenoid valve group,

^■ pulling voltage lines leading to the solenoid valves (M1, M2) of a solenoid valve group have a common pulling voltage line section (17), and ■ A voltage isolating switch (18) is arranged in the common actuating voltage conduction section (17) for making the electrical connection between the tightening voltage source (U _A ) and the solenoid valves (M1, M2) of the solenoid valve group.

2. Arrangement according to claim 1, characterized in that the holding voltage line for the permanent supply of the solenoid valves (M1, M2) is formed at least one solenoid valve group with holding voltage (U _H ), the holding voltage lines leading to the solenoid valves (M1, M2) having a common one Have holding voltage section (15).

3. Arrangement according to claim 2, characterized in that the voltage isolating switch (18) of a solenoid valve group connects the common tightening voltage section (17) to the common holding voltage disconnector (15) of this solenoid valve group in a node (13), wherein in the common holding voltage disconnector between holding voltage source (U _H ) and node (13) a diode (16) is provided which blocks a flow of current from node (13) to holding voltage source (U _H ) and preferably from node (13) to solenoid valves (M1, M2) of the solenoid valve group common line (14) for the supply of the corresponding solenoid valve (M1, M2) with pull-in voltage and with

Holding voltage is performed.

4. Arrangement according to one of the preceding claims, characterized in that the solenoid valves (M1, M2) of a solenoid valve group are selected such that there is no overlap of pull-in voltage actuation times with holding voltage actuation times.

5. Arrangement according to one of claims 1 to 4, characterized in that the ground tripping switch (11) of the solenoid valves (M1, M2) can be switched in a clocked manner, the pulse duty factor being designed in particular in such a way that when supplied with a pull-in voltage (U _A ) average current flow resulting from the clocking corresponds to the holding current resulting from supply with holding voltage (U _H ).

6. Arrangement according to one of the preceding claims, characterized in that each solenoid valve (Ml, M2) on the ground connection side a return line (20) which connects the ground connection of the solenoid valve (M1, M2) to the pull-in voltage source (U _A ), a diode (21) being arranged in the return line (20), which flows a current from the pull-in voltage source (U _A ) to the ground connection of the solenoid valve (M1, M2)

7. Arrangement according to one of the preceding claims, characterized in that first (M1) and second (M2) solenoid valves are provided, the first solenoid valves (M1) being closed when de-energized and the second solenoid valves (M2) are open when de-energized, preferably each gas exchange actuator (Zι, Ej, ZiAj ι, j = l, 2) has a first (Ml) and a second (M2) solenoid valve, and in particular for each cylinder (ZI, Z2, ...) of the internal combustion engine each at least one outlet valve (E1, E2) and at least one exhaust valve (A1, A2) is provided, wherein each of the intake and exhaust valves (E1, E2, A1, A2) can be actuated by means of a gas exchange actuator.

8. Arrangement according to one of the preceding claims, characterized in that all solenoid valves (M1, M2) of a cylinder of the internal combustion machine are combined to form a solenoid valve group.

9. Arrangement according to one of the claims 1 to 1, characterized in that for at least two cylinders (Z1, Z2) of the Brennlσaftmaschme, the solenoid valves (M1, M2) assigned to the outlet valves (E1, E2) form a first solenoid valve and the solenoid valves (M 1, M2) assigned to the outlet valves (A1, A2) are combined to form a second solenoid valve group.

10 arrangement according to Claim 9, characterized in that the at least two cylinders (Z1, Z2) are selected from the cylinders of the combustion liquid so that there is no overlap of the actuation voltage actuation time with the holding voltage actuation time within the solenoid valve groups.

11 Arrangement according to one of claims 1 to 7, characterized gekennzeiclmet that for a cylinder group of several cylinders (Z1, Z2) of the internal combustion engine, all first solenoid valves (Ml) of the inlet valves (E1, E2) to a first solenoid valve group, all first solenoid valves (Ml ) of the exhaust valves (A1, A2) to a second solenoid valve group and all second solenoid valves (M2) of the gas exchange valves are connected to a third solenoid valve group.

12. arrangement according to claim 11, characterized in that a cylinder group is formed which contains all cylinders (Z1, Z2) of the Brennlσaftmaschme.

13. Arrangement according to Aispmch 11, characterized by the fact that at least two cylinder groups are formed, one cylinder group each containing all cylinders (Z1, Z2) of a cylinder bank.

14. Arrangement according to Aispmch 11, characterized in that at least two cylinder groups are each formed by a plurality of cylinders (Z1, Z2), the cylinders (Z1, Z2) of a cylinder group each being selected such that there is no overlap of the cylinder groups in the solenoid valve groups A tension voltage actuation time and holding voltage actuation time is present, and preferably each cylinder group contains the same number of cylinders (Z1, Z2).

15. Arrangement for the controllable supply of solenoid valves of an electrohydraulic valve control of an internal combustion machine with electricity, with a gas changeover actuator being associated with solenoid valves

^■ a holding voltage provided at a holding voltage source ,; ^■ wherein the solenoid valves can be operated independently of one another, * an Aizugsspai voltage line that connects the solenoid valve to the pull-in voltage source; ^{■ in} each case one ground line leading from the solenoid valve to the ground, each having a ground tripping switch for switchably interrupting the electrical connection between the solenoid valve and ground; characterized in that

"a solenoid valve group is formed from a plurality of solenoid valves (M1.M2),""pull-in voltage lines leading to the solenoid valves (M1, M2) of a solenoid valve group have a common pull-in voltage line section (17), and in the common pull-in voltage line section (17) a voltage isolating switch (18) for creating the electrical connection between the A - tension voltage source (U _A ) and the solenoid valves (Ml, M2) of the solenoid valve group is arranged, a clocked switching of the voltage isolating switch (IS) with a corresponding pulse duty factor providing a mean voltage corresponding to a holding voltage (U _H ), the solenoid valves (M1, M2) of a solenoid valve group being selected such that there is no overlap of pull-in voltage actuation times with holding voltage actuation times is given.

16. Arrangement according to one of the claims 15, characterized in that each solenoid valve (M1 _; M2) on the ground connection side has a return line (20) which connects the ground connection of the solenoid valve (M1, M2) to the pull-in voltage source (U _A ), in which Refilling line (20) a diode (21) is arranged, which a current flow from Aizugsspannungsquelle (U _A ) to the ground connection of the solenoid valve (M1, M2) spenl.

17. Arrangement according to one of claims 15 or 16, characterized gekennzeiclmet that first (Ml) and second (M2) solenoid valves are provided, the first solenoid valves (M!) Closed when de-energized and the second solenoid valves (M2) are open when de-energized , wherein preferably each gas exchange actuator has a first (M1) and a second solenoid valve (M2), and in particular for each cylinder (Z1, Z2) of the internal combustion engine at least one inlet valve (E1, E2) and at least one outlet valve (AI, A2) is provided, each of the inlet

(E1, E2) and the outlet valves (A1, A2) can be actuated by means of a gas exchange actuator.

18. Arrangement according to one of claims 15 to 17, characterized in that all the solenoid valves (M1, M2) of a cylinder (Z1, Z2) of the internal combustion machine are combined to form a solenoid valve group.

19. Arrangement according to one of claims 15 to 18, characterized in that for at least two cylinders (Z1, Z2) of the internal combustion machine, the solenoid valves (M1, M2) assigned to the inlet valves (E1, E2) form a first solenoid valve group and the solenoid valves (M1, M2) assigned to the outlet valves (A1, A2) are combined to form a second solenoid valve group.

20. Ai order according to Aispmch 19, characterized in that a cylinder group is formed which contains all cylinders (ZI, Z2) of the Brennlσaftmaschine.

1. Arrangement according to Aispmch 19, characterized in that at least two cylinder groups are formed, one cylinder group each containing all cylinders (Z1, Z2) of a cylinder bank.