KR19980702719A - One or more electronic load control units - Google Patents

Abstract

The present invention relates to one or more electronic load control devices. The apparatus has a first switching means (115, 116), which is provided between the first terminal of the voltage supply and the first terminal of at least one load (100, 101, 102, 103). And second switching means (120, 121, 122, 123), the second switching means between the second terminal of the corresponding load (100, 101, 102, 103) and the second terminal of the voltage supply unit. Installed in In the present invention, an advantageous energy at the time of understanding from the first relatively high starting current value IA to the second low holding current value IH is accumulated at least in the accumulation means 145 and 146.

Description

One or more electronic load control units

Electronic load control devices of this kind are known, for example, from the specification of US Patent Application No. 4413240, which is still unpublished. In this device, the energetic energy liberated at the time of shutdown is accumulated in the condenser. In this case, the favorable energy at the transition from the holding current to the zero current is recharged in the capacitor.

However, this apparatus has a problem in that an advantageous energy is lost in the transition from the starting current to the holding current.

The present invention relates to at least one electronic load control device according to the higher concept of claim 1.

1 shows a first embodiment of the device according to the invention.

2 shows a second embodiment;

3A-3E and 4A-4F show various signals on the time axis.

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus of the simplest possible configuration in which the on-process of the switch is accelerated in the electronic load control apparatus and the total energy consumption is minimized.

An advantage of the device according to the invention described in the characterizing part of claim 1 is that the advantageous energies are recovered in the transition from the starting current to the holding current. According to a particularly advantageous embodiment, it is possible to simultaneously control two loads in different ways while using the same output stage. That is, fuel injection which overlaps with time becomes possible.

Hereinafter, a device according to the present invention will be described in detail below based on the embodiment shown in the drawings.

The apparatus according to the invention is preferably used for internal combustion engines, in particular for internal combustion engines of self-ignition type. In this kind of engine, the fuel control amount is controlled by a plurality of solenoid valves. Hereinafter, this solenoid valve is called a load. However, the present invention is not limited to this application example, but can be applied to all fields requiring an electrical load to be quickly switched.

When applied to internal combustion engines, especially self-ignition internal combustion engines, the opening and closing time of the solenoid valve determines the start and end of fuel injection into the cylinder.

1 shows the main components of the device according to the invention. The illustrated embodiment is a case of a four cylinder internal combustion engine. In this case, one fuel injection valve is correspondingly fastened to each load, and each cylinder of the internal combustion engine is associated with each fuel injection valve. In addition, when the number of cylinders of the internal combustion engine increases, the number of injection valves, switching means, and diodes increases accordingly.

Four loads are shown in FIG. 1 by reference numerals 100, 101, 102, 103, respectively.

The first terminal of each of the loads 100-103 is connected to the voltage supply section 105 via a switching means 115 and a diode 110.

The diode 110 is provided such that its anode is connected to the positive electrode and the cathode is connected to the switching means 115. This switching means 115 is advantageously a field effect transistor.

The second terminal of the load 100-103 is connected to the resistor 25 via one second switching means 120, 121, 122, 123, respectively. These switching means 120-123 are also particularly advantageously field effect transistors. These switching means 120-123 are called low side switches and the switching means 115 are called high side switches. The second terminal of the resistor 125 is connected to the second terminal of the voltage supply unit.

One diode 130, 131, 132, 133 is associated with each load 100-103, respectively. The anode terminals of these diodes are respectively connected to the connection point between the load and the low side switch. The cathode terminal is connected to the capacitor 145 and the new switching means 140. The second terminal of this new switching means 140 is connected to the first terminal of the load 100-103. This switching means 140 is also advantageously a field effect transistor. This switching means 140 is also called a booster switch. The second terminal of the capacitor 145 is connected to the second terminal of the voltage supply unit 105.

The high side switch 115 is supplied with a control signal AH from the control unit 160. The switching means 120 receives the control signal AL1 from the control unit 160, the switching means 121 receives the control signal AL2, the switching means 122 receives the control signal AL3, and the switching means ( 123 receives a control signal AL4 and a switching unit 140 receives a control signal AC.

A diode 150 is connected between the connection point between the switching means 115 and the first terminal of the loads 100-103 and the second terminal of the voltage supply section 105. In this case, the anode of the diode 150 is connected to the second terminal of the voltage supply unit 105.

By using the resistor 125, it becomes possible to detect the current flowing in the load.

According to the arrangement shown, the current measurement via the current measurement resistor 125 can be measured only when one of the switching means 120-123 is closed. Even when the low side switch is open, current resistors may be placed in different positions to enable detection of current. For example, the second terminal of the capacitor 145 may be connected to a connection point between the current measuring resistor 125 and the switching means 120-123. In this case, current measurement is possible even when the low side switch is disconnected. Again, this current measuring means may be provided between the voltage supply unit and the high side switch and between the high side switch and the load.

2 shows a corresponding device in which the loads 100-103 are divided into two groups. The loads 100 and 101 form a first load group, and the loads 102 and 103 form a second load group. These loads are associated with individual groups such that loads controlled simultaneously under a predetermined operating state correspond to various groups.

The same code | symbol as FIG. 1 is used for the element same as the element demonstrated in FIG. Here, one high side switch 115 and 116 is provided for each group. The diode 111 corresponds to the first group diode 110. Correspondingly, the booster transistor 140 is also provided in duplicate. In this case, reference numeral 141 is attached to the booster transistors of the second group. Similarly, the capacitor 145 is also given the reference sign 146 to the second group of capacitors. Again two new control lines are provided for the switching means 116, 141. The signal AH1 is supplied to the high side switch 115 of the first group, and the signal AH2 is supplied to the high side switch 116 of the second group. The signal AC1 is supplied to the booster switch 140 of the first group and the signal AC2 is supplied to the booster switch 141 of the second group. Correspondingly, the resistor 125 is also provided in double, in which case the resistor 126 is attached to the resistor of the second group.

In FIG. 3A, a control signal AC of the booster transistors 140 to 141 is plotted. 3B, the control signal AH for the high side switches 115 and 116 is plotted. 3C, the control signal AL of the low side switch is plotted. In FIG. 3D, the current I flowing through the load is plotted, and in FIG. 3E, the voltage UC applied to the capacitor 145 is fluted over the quadrature axis. In this case, the adjustment amount period for the solenoid valve is shown.

In each adjustment cycle, the different phases are distinguished. In phase 0 before load control, the output stage is cut off. The control signals AC, AH and AL are at low potentials. This fact means that high side switch 115, low side switch 120-123 and booster switch 140 block the flow. As a result, no current flows through the load. The capacitor 145 is charged up to its maximum voltage UC. This assumes that the voltage of the voltage supply takes a value of about 12V, for example about 80V.

In the first phase in which the control is started (this is also called the booster operation phase), the low side switch corresponding to the load adjusts the fuel. That is, in the first phase, the signal AL becomes high level. At the same time, a high level signal is sent to the line AC. This signal controls the conduction 140 to conduct. The high side switch 115 is not controlled and it remains blocked. The control of this switching means is carried out so that current flows through the booster switch 140, the corresponding load, the low side switch corresponding to the load and the current measuring means 125 in the condenser 145. In this phase, the current I rises very rapidly due to the high voltage in the load. This first phase ends when the voltage applied to the capacitor 145 is less than the predetermined value U2.

In the second phase (also referred to as start current control phase), the switch-on current is received at the high side switch 115 and the booster is deactivated. In this second phase, the control signal for the booster switch 140 is returned. The switch 140 is thus cut off. The control signals AH and AL for the high side switch 115 and the low side switch associated with the load are set at a high level with their switches initiating flow. The current thus flows from the voltage supply 105 through the diode 110, the high side switch 115, the load, the corresponding low side switch, and the current measurement resistor 125 and back to the voltage source 105. Is returned. By clock control of the high side switch, the current (which is detected using the current measuring resistor 125) can be controlled up to a predetermined value for the starting current IA. In other words, when the starting current reaches the target current IA, the high side switch 115 is controlled to shut off. If the new threshold is below the high side switch, the high side switch is enabled again.

If the high side switch 115 is cut off, free-wheeling becomes effective. Current flows through the low side switch, resistor 125 and freewheeling diode 150 at the load.

The second phase ends when the end of the startup phase is identified in the control unit 160. This is the case, for example, when the switching point identifying section identifies that the flanger of the solenoid valve has reached the new end position. An error is identified when the switching point identifier does not identify that the flanger of the solenoid valve has reached the new end position within a predetermined period.

In the third phase (also referred to as the first fast erase phase), the control signal for the corresponding lowside switch is canceled. This fact works as follows. That is, the current from each load flows through the diodes 130-133 corresponding to the respective loads to the capacitor 145, and the energy stored in the load acts to recharge the capacitor 145. In this case, the high side switch 115 is controlled as follows in the illustrated embodiment. That is, the switch is kept closed. In this phase, the current is reduced from the starting current IA to the holding current IH. At the same time, the voltage added to the capacitor 145 rises to the value U3. However, this value U3 is certainly below the value U1. This third phase ends when the target value IH for the holding current is achieved. The favorable energy at the time of transition from the starting current IA to the holding current IH is accumulated in the capacitor. In this case, particularly advantageously, the transition from the starting current to the holding current is performed at a high speed based on the rapid erasure.

The third phase is followed by the fourth phase. This fourth phase is also called a holding current control phase. Like the second phase, the control signal for the low side switch is maintained at its high level. That is, the low side switch corresponding to the load is kept closed. By opening and closing the high side switch 115, the current flowing through the load is controlled to a target value for the holding current. When the high side switch 115 is shut off, freewheeling becomes effective. Current flows through the low side switch, resistor 125, resistor 125, and freewheeling diode 150 at the load. The fourth phase ends when the fuel injection process ends.

In the fifth phase following it (this is called the second fast erase and fast erase check phase), the corresponding low side switch is cut off and the high side switch 115 is conduction controlled. In this phase, the current flowing through the load drops rapidly to the value (zero). At the same time, the voltage U added to the capacitor 145 rises by a value smaller by a smaller value than in the third phase.

In the third and fifth phases, the target value for the current I changes from a high value to a low value. In these phases, each of the low side switches associated with the load is controlled as follows. That is, controlled to block the flow. In this case, the liberated energy is recharged in the condensers 145 and 146. In these phases, rapid erasing is performed. This acts to bring current to its new target.

In the second and fourth phases, current control by clock control of the high side switch is performed. Under blocking of the high side switch 115, the freewheeling diode 150 operates. In these phases, the current gradually decreases. This fact leads to a reduction in the switching frequency.

In the sixth phase, the output stage is deactivated. In other words, the fuel adjustment amount is not performed. This means that the control signal AC for the booster switch 140 and the control signal AH for the high side switch are all low level and the control signal AL for the low side switch is turned off. . The current flowing through the load is kept at zero, and the voltage of the capacitor 145 is also maintained at that value.

By the control of the seventh phase (this is also called subsequent clock control), the high side switch 115 is maintained in its conduction state again by the control signal AH. By closing the low side switch, the current through one of the loads is initialized. This current is for example returned to the voltage source via the diode 110, the switch 115, the load 100, the switching means 120, and the current measuring means 125. The low side switch is controlled to open if the target value for the current selected has already been achieved such that the solenoid valve is not counteracted. This acts as a quick cancellation of the load and the current path formed by the diodes 130-133 and the capacitor 145. As a result, the voltage added to the capacitor 145 increases. At the same time the current again reaches its zero value, the low side switch 120 is activated again. This process is repeated in the capacitor 145 until the voltage gradually reaches the resumption value U1.

Subsequently, a third phase is performed in which all control signals are cleared and all switches are kept in their disconnected state. This phase corresponds to phase (0).

If each cylinder has only one fuel injection interval per adjustment amount cycle, there is no problem in the apparatus according to FIG. 1. However, if there is a preliminary injection before the original main fuel injection or an additional fuel injection after the original main fuel injection, there is a case in which the solenoid valves of the two cylinders are simultaneously started. In particular, there is a fear that the main fuel injection and the subsequent preliminary fuel injection, or further fuel injection and the preliminary fuel injection of the subsequent cylinder, overlap in time. This fact is linked to the following in the case of the circuit arrangement according to FIG. 1. That is, two loads are selected via the low side switch, but depending on the high side switch 115, there is only one common current control. In other words, it is impossible to control two solenoid valves differently at the same time in this device configuration. For this reason, for example, one solenoid valve controls the current as the holding current and the other solenoid valve cannot perform the same thing as the starting current. Again, the capacitor 145 must be controlled before the next solenoid valve. The charging of the condenser 145 becomes impossible even when the interval between the off time and the on time is successively continued at very short intervals between the two solenoid valves.

In this regard, control of allowing two solenoid valves to flow differently at the same time or charging the condenser 145 is enabled by the apparatus shown in FIG. In this device configuration, the load is divided into two groups. For each group of loads, one high side switch 115, 116, booster switches 140, 141, measurement resistors 125, 126, and capacitors 145, 146 are associated with each other. Each group of loads is selected using the respective high side switch 115 or 116. In accordance with the present invention, each load is associated with a different group assigned to a cylinder for continuously regulating fuel.

The apparatus according to the invention herein is shown, for example, in the example of a four-cylinder internal combustion engine, but the invention is also applicable to other multicylinder internal combustion engines. For this, a number of loads, switching means and new components are installed thereby. In addition, the load may be divided into more groups. This is particularly advantageous when the number of cylinders is large.

In the case of the above-described embodiment, the transition from the high current level to the low current level has been performed in accordance with the current control phase. In this case, part of the accumulated electrical energy is used for partial charging of the capacitor. New charging of the capacitor is performed at the end of control at the time of rapid erasure of the load current. A new voltage rise is achieved between the two fuel injection processes and the accumulation of electrical energy by periodic on and off of the load current (subsequent clock control) when the capacitor is not yet charged enough for the new switch on thereafter. do.

The higher the rotation speed, the shorter the period that can be used for setting the voltage increase using subsequent clock control. Especially at high speeds, it is not possible to set the impression between two fuel injection processes. As a result, the capacitor is not charged to the required voltage. Therefore, in another advantageous embodiment of the present invention, the voltage raising setting is already made during the current control period and the capacitor is completely charged again during the control period. This makes it possible to omit subsequent clock control between the controls. The risk of causing more undesirable fuel injection thereon is reduced. This is because the load does not flow between the two fuel injection processes.

4 corresponds to FIG. 3. First, in FIG. 4A, a control signal for the booster transistor 41, a control signal AH for a high side switch in FIG. 4B, and a control signal AL for a low side switch in FIG. 4C. 4D, the control signal AS considering the state of charge of the capacitor, the current I flowing through the load in FIG. 4E, and the drop voltage U in the capacitor in FIG. 4F are plotted along the time axis, respectively.

According to the control method according to FIG. 3, various phases are distinguished. In phase 0 before load control, the output stage is cut off. The control signals AC, AH, AL and AS are at low potential. This means that the high side switch 115, the low side switch 120-123 and the booster switch 140 are blocking the flow. That is, no current flows through the load. The capacitor 145 is charged up to its maximum voltage U10. This voltage is about 80V. On the other hand, the voltage supply is about 12V.

The first phase in which control is initiated corresponds to the first phase in the technique according to FIG. 3. During this first phase period, the signal AS rises to its high level. This indicates that the drop voltage is smaller than the predetermined value US in the capacitor.

In the second phase (also referred to as startup current control phase), the on current is received at the high side switch 115 and the booster is deactivated. This fact means that the control signal AT for the booster switch 140 is canceled in the second phase and thus the switch 140 is cut off. The control signals AH and AL for the low side switch associated with the high side switch 115 and the load are at a high level. As such, their switches initiate the flow. As a result, the current flows back from the voltage supply 105 to the voltage source via the diode 110, the high side switch 115, the load, the corresponding low side switch, and the current measurement resistor 125.

Unlike the second phase shown in FIG. 3, the current detected using the current measurement resistor 125 by clock control of the low side switch is controlled to a predetermined value for the starting current IA. That is, when the target current IA for the starting current is reached, the low side switches 120-125 are controlled to be blocked. If they fall below the new threshold, they are re-enabled. This fact is that when the low side switches 120-125 are opened, current flows through the diodes 120-133 corresponding to the load at each load, through the capacitor 145, and the energy accumulated in the load is condenser. 145 is recharged. At the same time, the voltage U applied to the capacitor 145 also rises.

This second phase ends when the startup phase is identified by the control unit 160. This may be the case when the switching point identifying section identifies that the flanger of the solenoid valve has reached its new end position.

In the third phase (also referred to as the first fast erase phase), corresponding to the third phase in the first embodiment, the control signal for the corresponding lowside switch is erased. This fact causes the current to flow through each loaded corresponding diode 130-133 at each load and into the capacitor 145. In this case, the energy accumulated in the load is recharged in the condenser 145. In this phase, the current decreases from the starting current IA to the holding current IH. At the same time, the voltage U added to the capacitor 145 rises. This third phase ends when the target value for the holding current is achieved. Advantageous energies at the time of transition from the starting current to the holding current are accumulated in the capacitor.

The third phase is followed by a fourth phase, also called a holding current control phase. As in the second phase, the control signal for the high side switch is maintained at that high level. The high side switch continues to close. As the low side switch opens and closes, the current flowing through the load is controlled to the target value for the holding current. When the low side switch is shut off, current flows through the diodes 130-133 corresponding to the load at each load to the capacitor 145. As a result, the accumulated energy in the load is recharged in the condenser.

In the capacitor, the falling voltage U reaches a predetermined threshold US, and at the same time, the signal AS changes to a low potential. Accordingly, the first part 4a of the fourth phase ends. At this point in time, the current control is not performed using this low side switch but rather using a high side switch. This means that the low side switch is always in its conducting position and the high side switch changes between its open and closed positions. In the case of the blocked high side switch 115, freewheeling becomes effective. Current flows through the low side switch, resistor 125 and freewheeling diode 150 at the load. The fourth phase ends when the fuel injection process ends.

The fifth phase that follows corresponds to the fifth phase in the technique according to FIG. 3. In this control method, the sixth and seventh phases in FIG. 3 are unnecessary.

As long as the signal AS is at a high level, that is, as long as the voltage does not reach a predetermined threshold US in the capacitor, the output terminal circuit operates as a current-controlled pulling regulator. In this operating state, the high side switch is continuously connected. Current control is performed by low side switches corresponding to individual loads. It is turned on and off periodically for current control.

In the condenser 145, when the drop voltage U reaches a predetermined value US, it is switched to another operation mode. In this mode of operation, no new charge of the capacitor is made. Current control is correspondingly performed using the high side switch as in the embodiment of FIG. 3.

The threshold US for the capacitor voltage is advantageously selected as follows. That is, the voltage at the end of phase 4a is selected to generate a voltage value necessary for rapid switch-on with the voltage rise in the fifth phase. In phase 4a, this circuit device operates as an impression setting regulator. Current control is performed using a high side switch in phase 4b.

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Claims (9)

At least one electronic load control device such as a solenoid valve for controlling the fuel control amount of the internal combustion engine, having first switching means (115, 116), the first switching means having one first terminal of the voltage supply section and one; It is provided between the first terminals of the above loads 100, 101, 102, 103, and has second switching means 120, 121, 122, 123, and the second switching means has a corresponding load 100. In at least one electronic load control device of the type provided between the second terminal of the terminal 101, 102, 103, and the second terminal of the voltage supply unit, One or more electronics characterized in that a means for controlling the switching means is provided so that an advantageous energy can be accumulated in the accumulating means 145, 146 when transitioning from the starting current value IA to the holding current value IH. Load control device. 2. The method according to claim 1, wherein in the first phase of the control, at least one first terminal of the load can be connected to the accumulation means (145, 146) using the third switching means (140, 141). Electronic load control device. The at least one electronic load control device according to claim 1 or 2, characterized in that the energy which is advantageous when the second switching means is opened can be accumulated. 4. The at least one electronic load control device according to any one of claims 1 to 3, wherein the energy that is advantageous in the transition from the holding current value (IA) to zero value can be accumulated in the storing means (145). 5. The at least one electronic load control device according to any one of claims 1 to 4, wherein freewheeling is effective in a phase in which the current can be controlled to a target value. The at least one electronic load control device according to any one of claims 1 to 4, characterized in that, in a phase in which a current can be controlled to a target value, an advantageous energy is accumulated in the accumulation means (145). 7. The accumulating means according to any one of claims 1 to 6, wherein the second switching means does not cause a corresponding operation of the load in the phase following the control and accumulates in the accumulating means an advantageous energy at the time of opening the second switching means. At least one electronic load control device, characterized in that it is controlled for a short period of time. The at least one electronic load control device according to any one of claims 1 to 7, wherein the accumulating means is connected in parallel with the second switching means. 9. The load according to any one of the preceding claims, wherein the load is divided into two or more groups, each of which has a first switching means (115, 116), a third switching means (140, 141) and a scale. At least one electronic load control device, characterized in that the means (145, 146) are associated.