JPH01500157A - Circuit arrangement for one or more electrical loads of a motor vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Circuit arrangement for one or more electrical loads of a motor vehicle The present invention determines different operating modes An operating switch that can be switched to multiple operating positions and different stages of the operating switch It has a programming unit equipped with a detector corresponding to switching signals, and When a switching signal is present within a particular sensing area of the detector, one or more load determine the associated operating mode and determine the switching signal transmission between the operating switch and the detector. The number of channels is less than the number of possible operating positions of the operating switch. It relates to circuit arrangements for loads, in particular for windshield cleaning systems.

Recently, the number of loads in automobiles or the number of modes of operation of various loads has increased significantly. I have added For example, in most cases there are four operating modes for automotive windshield cleaning systems. Supplied for wiper motors. In other words, one of the operating modes is wiper mode. One is a low wiper speed operating mode, One is a high wiper speed operating mode and one is when the wiper motor is There is a so-called intermittent operating mode in which the cycle is stopped for a defined period of time. a certain wind In the anti-cleaning system, this interval time is predetermined and unchangeable. another wind In anti-cleaning systems, the interval time is continuously regulated via a potentiometer. clause is possible.

Also, this is based on the idea that the interval time is variable in multiple steps. May be assembled and different fixed resistors instead of potentiometers connected to the connecting element. In this type of windshield cleaning system, A plurality of different intermittent operating modes may be adjusted via the operating switch. This way In this type of system, the operating switch has multiple operating switches for different operating modes. operation position, so that the different switch signals of this operation switch can be introduced into the programming unit that defines the operating mode determined by the switch. Ru. In windshield cleaning systems manufactured in today's production series, various operating modes are available. An expensive device with a large number of switching signal transmission lines or conductors corresponding to the The cable sends the switching signal of the operating switch to the programming unit There is a need to. The cost for this transmission line increases with the number of different operating modes. This is easily understood. Different power sources in various operating positions to reduce costs The pressure level is switched via an operating switch on the switching signal transmission line or conductor. A circuit arrangement is proposed in which a programming unit can handle these different voltage levels. Equipped with a detector that has a detection area related to the bell and determines the operating mode accordingly do. Only one switching between operating switch and programming unit A circuit arrangement of this type with a signal transmission path is described, for example, in German Specification O5 No. 2944. It is understood from No. 224.

The number of circuits between the operating switch and the programming unit is limited in this type of structure. Therefore, it is significantly reduced. However, this type of circuit device is not necessarily It is also true that it does not work reliably. The reason for this is, for example, the power supply supplied to the load. One or more terminals and the input of a switching signal transmission line or programming unit In a short circuit (short circuit), the voltage level is the voltage level of the desired operating mode. It is available in the input of the programming unit in accordance with. As a result, windshield cleaning If the system is brought into an operating state unintentionally or switched to a particular operating mode. There is a possibility that the switch may be turned on. A similar accident can be caused by changing the operating switch to a certain operating mode. Occurs while switching from one mode to another. This means that a completely unspecified voltage is switched on to the programming unit on the conductor during the time It's a good thing.

The invention is therefore based on the problem of increasing the reliability of the operation of this type of circuit device. I'm there.

This problem is solved according to the invention in addition to the sensing areas for different modes of operation. The device has one or more additional sensing areas for the switching signal, and the switching signal The signal is generated by a different circuit device than the switching signal in the operating position of the operating switch. will be resolved.

The present invention can be applied to fault conditions such as short circuits or such conditions that appear forcibly. However, it is not associated with a specific mode of operation, but is explicitly recognized and programmed. The detector of the ramming unit has a detection area for various different operating modes as well as for a switching signal different from the switching signal in the operating position of the operating switch. to be measured when formed in such a way that it includes one or more additional sensing regions of It is based on the recognition that it is possible.

A known example of a detector according to German specification O 8 2944224 thus A large number of sensing areas corresponding to the number of possible operating modes or operating positions of the operating switch. However, the number of detection areas of the detector according to the embodiment of the present invention is more than that. will also be increased. Furthermore, regarding the above trouble, the voltage level is A voltage that is measured on the transmission line and whose voltage level is regulated in the desired operating mode. Existence outside the level detection area is taken into account. Detector like this The integrated programming unit clearly distinguishes between trouble and normal operation. e.g. emit appropriate control signals that can switch off the entire system. .

The invention and its advantageous development will be explained in more detail below by way of example embodiments illustrated in the drawings. has been done.

FIG. 1 is a circuit diagram of a first circuit device, FIG. 2 is a circuit diagram of a detector, FIG. 3 is a circuit diagram of the second embodiment, and FIG. 4 is a circuit diagram of the third embodiment. Ru.

FIG. 1 shows a circuit diagram for an automobile windshield cleaning system. This circuit device Part mechanically adjustable to determine different operating modes of the windshield cleaning system 1 is an operating switch 10 with a possible contact bridge 11; contact tab The ridge 11 is continuously coupled to a first terminal 12 of a power source (not shown in detail). The terminal of this power supply is also connected to the vehicle body. To various operating positions a to This contact bridge 11 connects this terminal 12 of the power supply and the stationary contact 1 Provides a conductive connection between 3 and 3. The neutral position of this operation switch 10 is shown in Figure 1. It is shown. Adjust the contact bridge 11 to the left operating position and intermittent operation of the windshield cleaning system, each switched on at different time intervals. will be done.

Continuous operation with low wiper speed in operating position g is switched on and Continuous operation with high wiper speed is switched on. neutral position odor When the wiper means that it moves in its parking position and is then switched off . Furthermore, the operating position g' is moved to the right of the neutral position, and at that position g' All chip wiping operations are switched on. As a complete device, the operation The switch 10 further includes a switch 10 with a cleaning system which is additionally activated. Cleaning to perform a specific operating mode of the windshield wiper system that also runs on It is pointed out that the key 15 is provided.

From FIG. 1, a plurality of stationary contacts 13 each have the same output 17 of an operating switch. ．． It is understood that 18 and 19 are coupled through resistors having different values. It will be done. That is, at each operating position a, b, c, one terminal 12 and one output of the power supply are connected. A conductive connection is provided between force 17 and one of resistors 20a, 20b or 20c. Ru. Therefore, in operating positions d, e, f one of the resistors 21 is coupled to the output 18. has been done. In operating positions g and h, one of the resistors 22b and 22c is connected to output 19. When the cleaning key 15 is activated, the resistor 22a is also connected to this output 19. Ru. Resistors 20a, 21a and 22a have the same resistance value. However, 1 The three resistors 20a, 20b and 20c coupled to one output are approximately 1:3: It has different resistance values in a ratio of 9.

Furthermore, from the circuit diagram shown in FIG. 1, each output 17, 18, 19 is associated with It is understood that they are coupled via a series resistor 25.

If the contact bridge 11 of the operating switch is not on the stationary contact 13, , the associated output is held at a particular voltage level via this resistor 25.

After all, from the circuit diagram, the same resistor 22b is coupled in the circuit at the operating position g or g'. I can see that it is being done. The values of these operating positions are therefore electrically equal. death However, the contact bridge 11 is locked in the operating position g; They are mechanically different in that they are not locked in position g'. Konta, Kutbridge 1 1 automatically returns all at once from the operating position g' to the neutral position a. Coded like this The switched switching signal may be branched and taken out at the output of the operating switch. In this case, the switching signals have different voltage levels as far as this embodiment is concerned.

A part of the circuit arrangement includes a programming unit 3 including a detector 31. 0, and the detector 31 receives various coded switching signals of the operating switch. responsively determining an associated operating mode; This detector 31 is a microprocessor 3 2 or integrated into a chip of conventional structure. Three of these programming units Inputs 37, 38, and 39 are connected to other terminals 41 of the power supply through resistors 40, respectively. will be combined. Three protection resistors 42 are provided.

The operating switch 10 is operated via three switching signal transmission lines 47, 48 and 49. It is combined with a programming unit.

In the simplest case, the conductor acts as a switching signal transmission path. but While operating the switch, the switching signal can also be transmitted optically or acoustically. You may be From the circuit diagram shown in Figure 1, these switching signal transmissions are It can be seen that the number of feed paths is less than the number of possible operating positions of the operating switch. In Figure 1 In an embodiment according to provided for all.

In the circuit diagram according to Figure 1, the wiper motor of the wiper system as a load A so-called parking position switch 51 is connected to 50 . This wai The permotor 50 is alternately connected to each terminal of the power source via a relay 52. Or is it? Another relay 53 determines whether the wiper system should be operated at a low wiper speed or a high wiper speed. Determine which wiper speed should be operated. To control the wiper motor 50 This circuit arrangement is already known per se and does not require a detailed explanation. Further Figure 1 shows the wash pump module being controlled via another load 55 or relay 56. 55 is shown. The operating positions of the operating switch 10, i.e. the inputs 37, 88 . Depending on the voltage level at 39, programming unit 30 functions to an appropriate operating mode is determined and/or the load 55 is switched on. . For this purpose, the control signals for the various relays 52, 53, 56 are known to be specific. occurs at the point in time.

The detector 31 of the circuit diagram shown in FIG. Function. Part of this detector includes a plurality of comparator groups 60, 61 or 62. It is. Comparator 60a.

Sob, 80e, 60d and 80f are all coupled to human power 37 and switching Depending on the voltage level on the signal transmission line 47, that is, on the output 17 of the operating switch 10. It is controlled. The comparators 61 are all coupled to the input 38 and the comparators Data group 62 is coupled to input 39 . These comparators are Detection operation is performed within a certain range. For example, the voltage level at input 37 is in the range Ov. or 0% of the supply voltage, the signal becomes the output of comparator 60d. measured. If the voltage level is 20% of the supply voltage, comparator 80e reacts. The voltage level is 40%, 60%, 80%, 100% of the supply voltage , comparators 60a, 80b, 60c and 80f correspondingly Generates a switching signal. These measures apply to comparators 61 and 62. It is possible. This type of signal recognition comparator can also be used as a window discriminator. Also called.

The operating switch 10 is also shown in the circuit diagram of FIG.

Two different operating positions of the contact bridge 11 can be seen, which are of course identical. cannot be switched on at any time.

If the contact bridge 11 is on one of the stationary contacts 13, the voltage level is At input 37 of programming unit 30, comparators 60a, 60b , or 60c. This is resistance 20.25 and 40 to an appropriate size. In this way, the operating position a The comparator 60a reacts in the operating position and the comparator Boc reacts, and the comparator 60c reacts at the operating position C. . The time interval during each mode of operation, i.e. in this embodiment intermittent operation, is then determined by the outputs of their comparators. In this way, from Fig. 2, the detector 81 is transmitted through the assigned operating switch and switching signal transmission line 47. Three detection areas Da and Db each associated with a predetermined specific mode of operation. , Dc. What is important in the present invention is that various operating modes and In addition to the relevant detection area, there are also cases where the detector does not feature the desired mode of operation. It has three detection areas Dd, De, and Df that react to the switching signal. .

If the contact bridge 11 is located between two operating positions, such as operating positions e and f, If so, the voltage divider ratio at input 38 changes. This is stationary contact 13 This is because neither of the associated resistors 20.21 and 22 are coupled to the circuit. be. In this case, comparators 81a, 61b associated with the various operating modes.

None of 61c reacts, but comparator ale does. Ru. The detector 31 thus detects the switching signal or the voltage level at its input. has a first additional sensing region De for which the signal or voltage level is Regarding the normal switching signal or voltage level and operating position of the operating switch 10. It's different. This additional first sensing area has a voltage level of approximately 20% of the power supply. Contains switching signals.

Trouble can also occur with this type of circuit arrangement.

This is because the switching signal transmission path to input 39 can be interrupted. this place The entire combined supply voltage is coupled to this input via resistor 40, resulting in a The pallet 82f reacts.

In this way, the detector 31 has a voltage level that is different from the normal voltage level and one of the operating modes. There is a second additional detection area Df for the reference point. In theory, the switching signal It is also possible that the transmission line is coupled directly to the positive terminal of the power supply. In this case the total supply voltage is coupled to input 39 and this comparator 62f again responds.

This second additional detection area Df of the detector 31 thus detects two fault conditions. It functions to know.

However, the problem of shorting the negative terminal of the power supply occurs more frequently. So When , no voltage is applied to input 39 and comparator God responds. like this An enlarged additional detection area Dd is obtained in order to recognize other troubles.

The number of detection areas of the detector is thus greater than the number of different operating modes offered. You also need to recognize that. In the embodiment shown in the drawings, the predetermined Three sensing areas and three sensing areas for each switching signal transmission path in operating mode. There are additional sensing areas. Trouble is detected in two additional detection areas Dd and Df. be known. In other words, an open circuit in the switching signal transmission line or a positive or negative Trouble is detected in a short circuit at the terminal. Additional detection areas Whether the contact bridge is located between two operating positions in De is detected. This applies to each switching signal transmission line in the embodiment, The output signals of comparators operating equally are matched by OR gates 65a, b, e. connected to each other. The output signals of these OR gates can be used for control in various ways. can be done. In case of trouble, there is a short circuit or switching signal If the signal transmission line is open, the entire system uses timing element 63. can be switched off with a delay. Switch contact signal is specified If the time is not exceeded, the current operating mode is maintained. Comparator 20e, 2 1e, 22e, with a voltage level corresponding to the sensing area detected by If the switching signal is longer than 4J for a predetermined time, the switch is faulty. There is a high possibility that At that time the system is also switched off.

In the embodiment according to FIGS. 1 and 2, six different voltage levels are applied to each switch. is transmitted on the switching signal transmission line and monitored by a subsequent comparator. So Three of these voltage levels are combined with the normal operating mode and three comparators data is associated with additional sensing areas.

In the embodiment according to FIG. There are again six voltage levels monitored by the comparators, but However, four different voltage levels are available to save switching signal transmission paths. Associated with different operating modes, only two separate voltage levels can be detected within the additional sensing region. exists in This means that each of the four stationary contacts 13 has an associated resistance of 21.22 can be seen from the drawing by being coupled to the output 18.19 via. these resistor at 20%, 40%, 60% or is such that 80% is supplied to input 38 or 39 of programming unit 30. selected. Thus, in this example, 0% or 100% of the supplied power Only two additional sensing regions Dd, Df for voltage levels are possible. This example The voltage level of the embodiment of FIG. 1 determined when the switch is open is The resistor 25 through the cable is missing. As a result, the contact bridge 11 performs two movements. when the switching signal transmission line 48.49 is disconnected or shorted from the positive terminal 41 of the power supply, the same voltage level Bell can be measured in the embodiment of FIG. However, the two states are easily It is possible to differentiate. This means that during the switching of the operating switch this signal is However, if the conductor is interrupted or there is a short circuit, it will be supplied for a long time. This is because it can be measured over a time interval. As a result, this program The switching unit determines the timing of the switching signals present in this additional detection area Df. The time period is also measured and different control signals are configured to be generated depending on this time period. It will be done. If this switching signal is only supplied for a relatively short time, the operating current mode is retained. However, the system detects It is switched off by the long duration of the switching pulse.

Furthermore, from FIG. 3, when the wash key 15 is energized, the voltage level is The voltage level of the output 18 is measured and the voltage level of the output 18 is the voltage level when one of the power supply terminals 12 is short-circuited. It is understood that this corresponds to the pressure level. The cleaning pump motor 55 performs this cleaning for a short time. Since it is presumed that it is only controlled by the key, the period of the switching signal can be A similar principle of monitoring is applicable. This additional detection area Dd If the switching signal in the operating mode is supplied as a short circuit for only a short time, The “Cleanse” mode is switched on.On the contrary, if the period is long, the system system is switched off.

In addition to these detection areas for various different operating modes, the implementation according to FIG. The example detector has a switching signal that is different from the switching signal in the operating position of the operating switch. It has two additional regions for switching signals. In this way, for this example sufficient operational reliability is guaranteed. Furthermore, this embodiment has an operation switch and It has the advantage that the number of conductive wires between it and the programming unit is small.

The final embodiment in Figure 4 shows how to switch different voltage levels after being adjusted together. Two contact blocks are connected via resistors to the switching signal transmission lines 47 and 48. An operational switch IO is shown having ridges 11 and 11'. switch and The coupled resistor starts from the indicated stop position and adjusts to the left to increase the supply voltage by 4 0%, 40%, 40%, 60%, 60%, 60%, 80%, 80% and 80% voltage levels are continuously switched to the switching signal transmission line 48 and simultaneously supplied to the switching signal transmission line 48. 40%, 60%, 80%, 40%, 40%, 80%, 40%, 60% and and 80% voltage level is transmitted through the contact bridge 11'. The feed path 47 can be selected to be switched to. Continuously from a certain operating position When moving to another operating position, a voltage level of 20% of the supply voltage is applied to both switches. measured on the switching signal transmission path.

Because of the voltage level at its input 37.38, the detector Determine the code. i.e. a voltage level of 40% on one input 38 and another input. If available at 37, intermittent operation is switched on, for example. But input 3 7.38 High wiper if a voltage level of 80% of the supply voltage is applied on both Continuous operation with speed is switched on. In this way, the detector can The operating voltage level is determined by the operating position of the operating switch. Detects the operation mode.

This embodiment thus provides nine different operating modes or operating positions of the operating switch. The additional switching signals present due to This clearly shows that it can be recognized by the switching signal transmission path.

The mechanism of this embodiment is particularly inexpensive and, apart from the recognition of accident conditions, Even if a small number of switching signal transmission lines are used for a large number of defined operating modes, Since it is more recognizable, independent protection is possible.

The invention has been described by way of example in connection with a windshield wiper system for an automobile. Ta. Of course, the basic concept can also be applied to the control of other loads in automobiles. can. However, each of the embodiments described so far has been configured to connect multiple conductors to an operating switch. and the programming unit. Therefore, the operation of the operating switch The principles of the invention can be utilized if all operating signals are transmitted via signal conductors. Book The principle of the invention applies to the embodiment of switching signals distinguished by different voltage levels. More shown. However, if the switching signal is based on another criterion, e.g. or pulse duration, the use of the basic idea is valid. parable Even if the switching signal emitted by the operating switch has a digital code, the real The basic idea of the invention is achievable. However, in this case, for example, using Gray code If used, switching while switching the operating switch from one position to another The problem that the signal is not constant does not arise. In the embodiment, the operating switch controller A tact bridge is always connected to ground on one side and to the power terminal on the other side. The vehicle body is also connected to the power supply terminal. Therefore, in principle, the contact block The ridge may be connected to the positive terminal of the power supply, but in this case the ridge is connected to the positive terminal of the power supply. A resistor with a relatively low resistance shows the switching signal transmission line with ground. It is necessary to withstand fairly high power consumption against

Finally, the control signals emitted in the case of the aforementioned troubles are perceived completely differently. It has also been shown that it is possible to The entire system may be switched off. and the switching signal transmission path exhibits trouble characteristics. No more questions about which switching signals are measured Can be done. Of course, problems also include how to deal with special problems. It may be indicated acoustically or optically for the user's discretion.

This analog processing of measured values ensures that voltage swings do not affect the measured results. To ensure that a regulated power supply is most often used or is a resistor supplied with a constant current. However, especially in simple embodiments, The resistor and comparator may be coupled directly to the vehicle battery. The voltage is Both the measured voltage level and the comparator sensing area change when However, this has an adverse effect on the measurements as far as these detection areas, which differ considerably from each other, are concerned. does not occur.

The entire system is preferably produced in integrated circuit technology and, if necessary, a specially programmed microprocessor or microcomputer, or may use prior art chips.

ANNEX To THE INTERNAT 0NAL 5EARCHREP ORT ON

Claims (17)

[Claims] (1) An operating switch that can be switched to multiple operating positions to determine different operating modes. switch and a detector corresponding to the different switching signals of the operating switch. logging unit and the switching signal is within a specific detection area of the detector. determine the associated operating mode for one or more loads when present in the operating switch and The number of switching signal transmission paths to and from the detector is the number of possible operating positions of the operating switch. In the circuit arrangement for one or more electrical loads of a motor vehicle, the various operating modes are In addition to the sensing area for signals, the detector has one or more additional sensing areas for switching signals. and whose switching signal is the switch in the operating position of the operating switch. A circuit device characterized by a signal that is different from a ringing signal. (2) Different voltage levels on one or more switching signal transmission paths determined via the operating switch in the operating position, the voltage level is applied to the sensing area of the detector as claimed in claim 1, characterized in that it is assigned to a corresponding operating switch. circuit device. (3) Voltage level while switching the operating switch from one operating position to another. The circuit is switched into a switching signal transmission path, and its voltage level at the operating position is voltage level, and the first additional sensing area is associated with this voltage level. 3. The circuit device according to claim 2, wherein the circuit device is connected to the circuit device. (4) The switching signal within this first additional sensing area The adjusted operating mode is maintained for a defined time period. A circuit device according to claim 3. (5) A switching signal transmission path is connected to one terminal of the power supply that supplies the load. When a short circuit occurs, a voltage level is supplied to the switching signal transmission line, and this voltage level The voltage level in the operating position is different from the voltage level in the operating position. Claims 1 to 3 are characterized in that the above additional detection areas are associated with each other. 4. The circuit device according to any one of item 4. (6) When the switching signal transmission path is short-circuited at the positive terminal of the power supply, the The pressure level is within the second sensing region, but there is no switching at the negative terminal of the power supply. If the signal transmission path is short-circuited, the voltage level must be within the third detection area. The circuit device according to claim 5, characterized in that: (7) When the switching signal transmission path is interrupted, the voltage level is voltage level, and that an additional sensing area is associated with this voltage. A circuit device according to any one of claims 1 to 6, characterized in that: (8) The additional detection area provided for short circuits is the switching signal that is interrupted. characterized by an additional sensing area for the voltage level available with the transmission line A circuit device according to claim 6 or 7. (9) For switching signals within the second or third detection area, all loads The voltage supply to the switch can be switched directly or delayed via a timing element. According to any one of claims 5 to 8, the device is turned off. circuit device. (10) in the switching signal within the second or third additional sensing region, one characterized in that the load and/or the operating mode of the load is switched off. A circuit device according to any one of claims 5 to 8. (11) The operating switch is switched to a plurality of operating positions and coupled to the first terminal of the power source. contact bridge, which can also be operated in various operating positions. one of the stationary contacts, and each stationary contact has a different resistance value. is coupled to one of the outputs of the operating switch through a resistor having a One of the inputs of each programming unit via a respective switching signal transmission path each of these inputs is coupled to the second terminal of the power supply through a resistor. and the outputs of the operating switches are each coupled to the first terminal of the power supply via a resistor. The circuit according to any one of claims 1 to 10, characterized in that: Device. (12) If the switching signal transmission line is short-circuited at the first terminal of the power supply, the supply power A voltage level of 0% of the voltage is measured at the input of the programming unit and the second If the terminals are shorted, a 100% voltage level will be measured and the 20% voltage level during switching to the operating position, and the voltage level in the operating position characterized in that each resistor is selected such that the value is greater than 20% and less than 100%. 12. The circuit device according to claim 11. (13) Claim characterized in that the first terminal of the power supply is also connected to the vehicle body. The circuit device according to scope 11 or 12. (14) The detector also detects the duration of the switching signal present within the additional sensing region. Claims characterized in that the measurement is performed and different control signals are generated depending on the period. The circuit device according to any one of items 1 to 13. (15) While switching the operating switch from one operating position to another, What is the voltage level in the operating position when the switching signal transmission path is interrupted? A different voltage level is measured and the first additional sensing region is associated with this voltage level. voltage level within this first additional sensing area indicates the current operating mode. is maintained, but if the voltage level persists for an extended period of time, all loads will switch 15. The circuit device according to claim 14, wherein the circuit device is turned off. (16) Power supply while the switching signal transmission line is short-circuited at one of the terminals of the power supply The voltage level is determined by the voltage level during the switching on of a particular load that is controlled for only a short period of time. a second additional sensing region corresponding to the voltage level and associated with this voltage level; A specific load is switched on at a short voltage level within the additional sensing area of 2. However, if the voltage level persists for an extended period of time, all loads will be switched off. 15. The circuit device according to claim 14, characterized in that: (17) An operating switch has different voltage levels on multiple switching signal transmission paths. It has multiple contact bridges that can be switched and the detector can measure this simultaneously. It is characterized by determining a specific mode of operation for the load from different voltage levels. A circuit device according to any one of claims 1 to 16.