HU228948B1 - Method to reduce torque of wiper driving motors - Google Patents

Description

BACKGROUND OF THE INVENTION The present invention relates to a method for operating a motor driven lung drive, a computer program product having a program code stored on a machine readable medium, and a control device for a hair follicle. In particular, the present invention relates to a reduction of engine torque during wiping.

State of the art

For grinding drives <WSA> components are subjected to forces during operation. In the case of toothpicks which are used, for example, in motor vehicles for windscreen wiper structures, these forces are increased mainly when the snow load or blocking structure is blocked. Above all, in the case of the latter blockage, and particularly in the case of rigid equipment, very heavy loads can occur which can damage or destroy the wiper system. Failure of parts may result in the eraser being completely down. For example, articulated rods may clatter from their seats or components of the stem drum arrangement may be bent.

If a bend lever is used for the kink drive, which has the advantage of the lever transmission and / or may also bring the advantage of the rod lock self-locking in the parking position, the forces generated by the engine torque are additionally amplified. In this case, rod values of up to 2.5 kN may occur. Such rod bars must be able to withstand these.

Typically, rotary drive motors are used in rotary actuators, whereby the motor alternates the direction of rotation to create reciprocating motion of the thrust mechanism. Meanwhile, the wiper blade changes its direction of movement between a lower reversing position and an upper reversing position. In addition, the use of such reversing motors allows for an offset parking position (EPS), i.e., a parking position below the lower reference position so that the offset * fean can park in the deepest position of the sweeper, which is not achieved during normal operation.

As a function of protection against damage or failure, the electric motor in the wiper drive can be reduced by reducing the voltage by reducing the strain on the motor by reducing the strain on the motor by reducing the strain on the motor. even at high wind speeds, the wind speed can go all the way and stay functional, even taking into account the minimum speed required by the legislator for windsurfing, so that the number of turns at the lowest speed of the windsurfing system may not fall below a given speed. However, in the case of wiping of the wiping device, sufficient sensitivity is required to protect the device. However, the idea of a device to prevent the device from blocking is in stark contrast to the statutory requirements, because when the engine torque is properly reduced, the required torque may not be available anymore,

However, by means of the bending lever effect, which amplifies the torque mainly in the lower reversal position range, a voltage dropper can be provided which has a range that rises linearly with the engine rotation angle from a small angle (EPS) to a first angle, Continues up to a reversing position on a plateau. Here the range of the voltage drop between the offset parking position and the upper Reversing position is approximately the lower third. The voltage drop adjusts the impulse dissipation modulation from a predetermined angle of rotation of the drive motor to a lower reversing position, or to a shifted color, for example, linearly. For this purpose, the rotation angles and the height of the launcher platform are defined as vehicle-specific parameters in a wind tunnel to ensure proper operation in all applications, even under wind loads, as required by the legislature.

s.

Disclosure of the Invention

The object of the present invention is to solve the above-mentioned problems, at least in part, and to further reduce the number of rodents compared to the prior art bowler, especially when the existing starch bowler is not able to sufficiently reduce the number of rodents.

According to one embodiment, there is provided a method of operating a motor driven wiper, in particular for a wiper mechanism. The method comprises operating the plunger drive substantially between a lower reversing position and an upward reversing position according to the normal operating characteristic curve of the wiper drive correlating with the engine torque, and in the first motor axis position of the lower reversing point of rotation. a first torque is provided through the normal operating signal section and from a first engine shaft position to a second engine shaft position within a range of motion corresponding to 1Ό to 30% of the rotational position of the engine shaft to offset parking positions, the first torque of the engine %, especially at least 30% relative.

According to another embodiment, a computer program product is provided which has program code stored on a machine-readable medium. The computer program product is configured to execute one of the process embodiments of the invention described herein, when the program is executed in a vehicle computer or control device.

According to a further embodiment, there is provided a control device for a wiper drive, which control device is programmed for use in a method according to the embodiments described herein,

Preferred embodiments and particular aspects of the invention will be apparent from the dependent claims, from the drawings, and from the accompanying description.

Advantages of the Invention

The embodiments of the invention described herein can reduce the torque exerted by the motor in the event of maximum mechanical loading of the crusher, thereby limiting the total load on the system components, such as torsion, tensile and compressive stresses.

Thus, on the one hand, it is possible to ensure a particularly critical condition of the wiper system, namely, the condition of switching off the snow thrower system in which the device moves to the offset parking position. Meanwhile, the most powerful forces are created by the elbow lever effect. This safety feature is primarily due to the lack of statutory speed limits in the parking range. Thus, during the movement from the lower steering position to the offset parking position, it is possible to further reduce the torque or the pulse width modulation and, optionally, further reduce the speed of the sweeper.

To this end, embodiments of the present invention provide for a case difference between the normal operation of the wiper and the parking operation, in which case the wiper is moved from its lower steering position to the offset parking position. For this purpose, in the characteristic curve range for offset parking spaces, that is, in the parking mode curve section, the torque is reduced from the normal to the normal voltage drop by, for example, modifying direction. According to a further particularly preferred embodiment, such a jump function may also exist in a plurality of angular positions of the parking curve section of the characteristic curve. This can further reduce the torque of the wiper motor.

According to further typical preferred embodiments, the characteristic curve is derived from the torque curve plotted against the motor crank angle and the impulse width modulation curve plotted against the motor crank angle. Jump curve or discontinuous behavior or break of a function here means that if the curve is given in the form of a function, it is a mathematically discontinuous function, or if the curve is given in a table, one of the functions approximating the table shows, such a function can typically be approximated by regression, and analogous to the deflnl • ί φ ~ 5 of the discontinuous function, the regression takes place in two ranges, the normal operating curve section and the parked operation curve section.

In a particularly preferred embodiment, the methods described herein are configured such that the engine torque is 40% of the maximum driving torque of the engine in the range between the downshift position and the offset parking position, particularly between the downshift position and the offset parking position. or less, especially 30% or less.

In this way, the magnitude of the torque and the pulse width modulation can be specified in the signal curve section for the parked seat. According to particularly preferred embodiments, the torque may be constant in the range of the parking characteristic section, or, in the case of a plurality of discontinuous motor rotation arms, the torque may be provided by a larger number of constant platforms.

According to a further preferred embodiment, a blocking of the roof structure is observed in the reduced torque range of the characteristic curve, i.e., in the parking curve section. If a wiper block is detected, the wiper is in a signal position - by example! the top change of direction! position - moving. In this way, the user can be informed that the wiper has a blocking action, especially in the offset parking position. The upside-down position near the position, for example near the A-pillar of the vehicle, is an unmistakable signal to the user. This is advantageous because blocking near the parking lot is usually not recognized by the driver and thus not considered a malfunction.

According to other particularly preferred embodiments, the blocking is detected by detecting the motor drive current and the motor warping. In this way, the correlation between the power exerted by the motor and the resulting angular deflection can be investigated, and if, for example, there is minimal or no angular deflection at high forces, it can be interpreted as a wiper block.

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-8 Brief Description of Drawings

Embodiments of the invention are illustrated in the figures and will be described in more detail below

Fig. 1 is a schematic illustration of a stall drive, a wiper assembly, control and inspection edges, and operating ratchet struts; the

Figure 2 is a schematic diagram of a wiper drive according to embodiments of the invention; and finally the

Figure 3 is a flowchart of a method for operating a wiper drive according to embodiments of the invention,

Embodiments of the Invention

Figure 1 schematically illustrates the construction of a wiper drive. An engine 10 rotates a disk rotating about an axis 12. A crank arm 20 includes an engine spindle 21 and a bearing 28. The front pivot bar 22, which is pivotally connected to a lever 24 by an additional bearing 23, causes the bearing 28 to rotate the wiper arm 32. In Figure 1, the wiper arm 32 is illustrated on the windscreen 30 in any position. Dashed lines at the top 102 change of direction! position, the lower 104 reversal! and the offset parking position 108 are shown. By reversing rotation of the motor 10 during normal operation, the wiper arm 32 is the upper reversal 102! position and lower 104 change of direction! situation moves back and forth. If the wiper mechanism is not needed or not used during operation, ie if the driver disengages the idler drive, the wiper arm 32 is the lower reversal 104! from position to offset 106. The offset parking position 108 is typically located in a very deep position on the windshield, for example wholly or partially in the windshield of the vehicle's curb cover.

Thus, according to typical embodiments, it can be achieved that the wiper arm 32 is parked very deep relative to the windscreen 30. For example, the offset parking position may correspond ^{to a} rotation of 2-3 ^a below the lower reversing position.

As shown in Figure 1, the matrix is typically controlled by a control device 31, and the motor recognizes its position by "e.g. rotation about axis 12 - a sensor" such as a magnetic sensor. The sensor 33 is illustrated in Figure 1.

Embodiments of the present invention provide an opportunity to reduce the engine torque during the deletion process, particularly the lower Reversing! position and offset parking position. Figure 2 illustrates one or more corresponding characteristic curves as a function of the engine crank angle. The engine axle positions analogous to Fig. 1 are illustrated in the figure. Motor crank angle 102 is the top change of direction! situation. The crank arm 104 corresponds to the lower reversing position. The 1ÖS crank angle corresponds to the offset parking position. Curve 220 illustrates the actual torque requirement of the wiper motor. In order to meet the requirements of the legislator in all applications and in all operating conditions, the curve 200, exemplified herein by pulse width modulator, has been provided so far with a platform 202 having an angle greater than 202 in FIG. At angle 202, the pulse width modulation was controlled by a tumbler so that the pulse width modulation and the resulting hook torque, as illustrated by the extension of the voltage dropper 201, decrease to the offset parking position 21. This voltage drop regulates the pulse width modulation from the maximum of the platform to 212 from the pivoting position of the motor shaft and the pivoting angle 202 of the drive motor to the pivoting position of the offset parking position. The angle of rotation of the tension drop platform and its height as vehicle-specific parameters are typically defined by a wide channel to meet legal requirements.

As can be seen, among other things, from the actual torque requirement of 220, the elbow lift effect results in a reduced engine torque requirement, particularly at low engine angle shafts ™, i.e. angles toward the offset parking position. In this range, the elbow lever effect is particularly strong. It follows that even in the case of blockage, particularly high forces are generated in the range of deep end positions of the wiper arm. Kinematic reasonsΦ Φ.φ

Φ Φ Φ in extreme position - torque can no longer occur, only force. Due to the elbow lever effect, forces are increasing in this extended range.

In embodiments of the present invention, a case distinction is made for a characteristic curve 200, such as a PW'M symbol curve. This case distinction results in a normal operating characteristic curve 230 and a parking message 232 characteristic curve, characteristic A 200. and the function of the characteristic curve 200 shows 233 jumps to the crank arm 104, which corresponds essentially to the lower tilt position. Thus, the curve function has a discontinuous behavior in this range. It follows that the lower 104 reversal! torque, or decrease the pulse width modulation value to 214. This poses the greatest risk in terms of load or failure! in the range of potential, that is, near the extended operation of the elbow pad, in which the torque requirement is reduced when moving into the elbow pad, the torque or the pulse width modulation value can be reduced to 214.

According to typical embodiments, such control may be integrated into software. In the range of rotation of the motor between the lower steering position and the parking position, the pulse width modulation can be reduced once more with respect to the existing voltage drop by integrating additional parameters. To this end, according to preferred embodiments, two additional parameters can be integrated into the software, namely, the speed below the maximum impulse width modulation for the parking and the torque generated by the engine during movement from the lower steering point to the offset parking position. In addition, or alternatively, the dynamic load on the entire plunger system can be reduced at lower speeds.

The case difference between the normal operating signal curve section and the parking mode curve section allows for significantly lower motor torque delivery in the mechanically critical elbow range, especially because in this range, szél «« «« ««

Φ Φ X Φ Φ * * φ φ. φ φ

X φ φ Φ X ·> *

- 9 rounds of application are negligible or severely reduced, and statutory rpm values are not required in this range.

According to other preferred embodiments, the case discrimination also has the advantage that, in the normal operating characteristic range, i.e., the lower reversal position 104 and the upper reversal position 192! In between situations, the torque provided by the pulse width modulation can be optimized solely on the basis of normal operation and legal requirements for normal operation. Between the down position and the offset parking position during parking operation, engine control can be made more sensitive without adversely affecting normal operation.

In typical embodiments, we can provide both a Reduced Torque and a Reduced Speed, which can even reduce the speed below the statutory requirements, to operate the wiper drive in the range between the lower reversing position and the offset parking position. This is primarily an advantage in the elbow range, which is characterized by a highly reduced torque requirement. It follows that, in this range, the torque curve and the pulse width modulator curve can be lowered step by step to smaller values.

According to still further particularly preferred embodiments, the torque or pulse width modulus value 214 in this range may be kept constant. Alternatively, additional torque-reducing jumps may be made available in the ice hatch function in the direction of the offset parking position. For example, there may be two or three platforms where the torque is present. Also, the pulse width modulation is constant.

According to a further alternative embodiment of the invention, the characteristic curve 200 as illustrated by the dashed line 234 may be configured such that the characteristic curve is loose at the motor axis position of the lower reversing position to reach the offset parking position. reducing the torque or pulse width modulator to 218. Thus, a preferred embodiment is created in which the signal is gray, ΦΧ ΦΦ <. · Φ φφφ 4 Φ Φ. Λ V Φ Φ Κ

φ. φ Φ Φ Φ Φ φφφ X X, φ * ΦΧ ΦΦ * Φ

The first derivative of 10 into the normal operating signal waveform and the parking signal waveform shows substantially discontinuous behavior at its transition point.

Therefore, the case distinction between the normal operating section and the park operating section according to an embodiment of the invention can be illustrated in general as follows. The characteristic curve 200 has a first torque value for the motor shaft position 104 at the normal operating characteristic curve section 230. As the motor shaft position moves from the value 104 to the position 106 towards the parking position 106, a significant reduction in torque occurs within the first 10% of the position change from position 104 to position 106. For example, starting from position 104 in a position that corresponds to 10-30% of the engine blade position change from position 104 to position 108, the engine torque value will be at least 12% starting from the lower operating point torque value of the normal operating curve. may be reduced by at least 30 relative% or at least S0 relative%. Thus, for example, if the torque of the normal operating curve at position 104 corresponds to 60% of the maximum engine torque brake, then a 10% relative reduction would correspond to an absolute value of 54% of the maximum engine torque. In Figure 2, this value is indicated by 235 points. Position 105 corresponds to 10% of the TÖ4 position to position 108 (for better clarity, the representation is non-volumetric. The torque 235 and pulse width modulation values at 235 are based on the minimum operating position at position 104, for example, a 12% decrease,

In accordance with an embodiment of the present invention, Figure 3 illustrates a suitable process flow chart. The wiper drive is started in step 301. This can be done, for example, by actuating a suitable actuator, for example, by the vehicle operator operating a lever on the dashboard. According to the case difference sensor, in step 302, sensors determine whether the motor shaft positioner is smaller than the lower reversing position. If not, ie if the engine is in the lower reverse direction or the lower reverse direction! position 303 to the upper gear shift position, then in step 303, the wiper drive is operated in accordance with the normal operating characteristic curve of the gingival torque curve and the pulse width modulation curve.

If the wiper drive is in the range of the parking characteristic curve (step 302 ~ YES), then the torque in step 304 is significantly reduced. This significant reduction may be provided by the relative percentages given above, by the described hopping function and / or by breaking the characteristic curve (see Figure 234, Figure 2). Reducing the number of filaments below the statutory values for normal operation, as described below, leads to further preferred embodiments of the invention, with additional advantages. Blocking of the wiper system is typically recognized by detecting the current supplied to the motor and the angle of the motor. The motor recognizes its position by a sensor, e.g., a magnetic sensor (see evaluator 33 in Figure 1), and the control device 31 can measure the electricity provided. In the offset parking position, in the immediate vicinity where the elbow lever is located near the extended position, and thus the elbow lever makes a significant impact, the force requires less power from the motor and, nevertheless, exerts relatively high forces, This. As a result, due to the low current and the resulting low booster forces applied by the elbow lift, the engine cannot reliably detect blockage. For example, due to the elbow lever effect, the forces may increase so much when the current is lifted that the complete wiper system will move slightly or rotate by itself, thus eliminating the possibility of the engine being detected.

However, if in step 304 the torque is reduced to such an extent that no motion detectable by the sensor 33 is produced despite current conducting, as shown in Fig. 3, step 3 to 6, the shifting position from the lower gear to the shifting position may. If, in step 306, the check indicates that there is no blockage, the procedure will, for example, continue until the filled parking position is reached. To do this, verify that the parking position has been reached (step 307), and after reaching the parking position, turn off the headland system in step 309. If the parking position has not yet been reached, continue the parking step during which the headland system is lowered. or a torque

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X ♦ Φ Φ φ ΦΦ Χ »ί X Φ Φ Φ λ

Φ XX X Φ Φ. Φ X <Φ φ φ φ.

with further fitted, reduced torques, we continue to drive it and continue to © flutter if there is a blockage. If the process recognizes wiper system blocking in step 308, then in step 308 the sweep drive may move to an indicator position, such as the upside down position, that is, typically, the wiper arm in position 309 close to the vehicle column. törlörendszert. This can be used to alert the user to notice the tripping. This is particularly advantageous because the user is usually unable to detect malfunctioning, such as blockage, in the vicinity of the parking position. On the one hand, the driver does not recognize minimal movement. On the other hand, the parking position at rest corresponds to the user's expectations.

Thus, in embodiments of the invention, it is possible to detect a blockage in the critical elbow range and to visually indicate to the driver by blocking a blocking position by moving to a signaling position, such as the upside down position, so that the driver is not aware of the condition. The driver may take precautionary measures, such as removing snow from the windscreen, before the swing drive becomes inoperative. Thus, in accordance with an embodiment of the invention, the reduced torque and lower speed enable the detection of blockage, which cannot be reliably performed at conventional speeds and torques. In addition, the optional parking position near column A relieves the wiper system and alerts the driver to the anomaly.

The procedure described here to further reduce engine torque during parking can be advantageous in many regions, especially if the vehicle has been parked for extended periods of time and the windscreens have not been properly cleaned before using the vehicle. But in Scandinavia, Canada and similar regions, heavy snowfall, such as heavy, wet snow, can also cause snow on the move, both in the lower area of the windscreen, near the parking position and in the upper corner of the car. When the snow system is turned off and the sweeping system tries to move to the offset parking position, especially in the lower snow areas, where forces are particularly strengthened by the elbow pad effect, the space is extremely large. XX Φ φ φ * φ φ φ

Χ «Φ X φ * # φ

Φ »'8 Φ # 8 X Φ φ

Φ *. · «

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-13 operation on the winding system. This can even cause the breakdown system to fail. The case differentiation with a park medium characteristic curve according to the embodiments described above allows the torque and / or roctor speed to be reduced even below the statutory values. The reduction of the tongue and groove applied here can prevent overloading of the tumbler system or cause it to reliably detect blockages in the extended position of the elbow.

Claims (10)

A method of operating a motor driven wiper drive (10) for a windscreen wiper assembly comprising:. the windshield drive is essentially a bottom change of direction! between the position (104) and an upper Directional change position (104), the doh door that widens the norm for the throttle drive according to the operating torque section (230) of the motor torque correlation substantially between the lower direction of reference (104) and an offset parking position (106). I park the characteristic curve of the drive gear which correlates with the torque of the motor! operating in accordance with a signal curve section (232, 234); in addition, a first torque is given at the first motor shaft position of the lower direction of rotation through a normal operating characteristic section and from a first motor shaft position to a second motor shaft position 30 to an offset parking position up to a displaced parking position. and reducing the engine torque from the first torque by at least 12 relative%, especially at least 30%, The method of claim 1, wherein the first derivative of the characteristic curve or characteristic curve exhibits a discontinuous behavior (233) at a substantially transient point of the normal operating characteristic and the parking characteristic, in particular wherein the characteristic is non-uniform in the parking domain. shows continuous behavior. The method of claim 1 or 2, wherein the characteristic curve correlates with pulse width modulation dependent on the angle of rotation. 4. The method of any one of claims 1 to 4, wherein the discontinuous behavior is a function break or a break in a virtual function obtained by regression of data in a reference table. !> * # »Β φ XX χφτ -15 5. The ί-4. Method according to one of the claims, wherein the engine torque is in the range between the lower reversing position (104) and the offset parking position (106), especially the lower reversing position! and the offset parking position is driven by a torque equal to 40% or less, in particular 30% or less, of the maximum driving torque. 6. A method according to any one of claims 1 to 4, wherein the torque of the engine is constant between the lower reversing position and the elapsed parking position. 7. The method of any one of claims 1 to 4, further comprising; reducing torque through curve Detection of wiping of the wiper during time; and after detecting the blocking movement, the wiper (32) is positioned in a signaling position, in particular in the upper reversing position. 8. A method according to any one of claims 1 to 5, wherein the detection of blocking includes detecting the drive current and detecting a change in the drive angle. A computer program product having program code stored on a machine-readable medium for performing the procedure of any one of claims 1 to 3, wherein the program is executed on a vehicle computer or control unit, A control device (20) for a drive unit, the control device of which is 1-S. is programmed for use in a method according to any one of claims 1 to 6.