DE19539925A1 - Servo-drive arrangement for opening and closing motor vehicle window - Google Patents

Abstract

The servo-drive for the vehicle window has the current for the electric servo motor monitored as well as the rate of change of motor movement. The relative torque level w.r.t. motor movement provides a threshold level which is compared with stored levels to determine if an obstruction is in the path of the window. The threshold levels are constantly updated to generate a responsive safety cut out for the window drive. The movement of the motor is monitored by a Hall Effect device with the readings fed to a processor. The motor movement is divided into discrete segments to provide a series of threshold levels. Rises in the threshold level above preset values provides a rapid indication of an obstruction.

Description

The invention relates to a device for control the opening and closing of the windows of a motor vehicle or similar.

In a device for controlling the opening and Closing windows is e.g. B. in the process of closing of a window the decision "trapping a stranger body "when the rate of change of the An drive current of the motor driving the window or the Rate of change of the period of the rotation of the motor detected send pulse reaches a predetermined value so that the process of closing the window is canceled.

Although the rate of change of the drive current or the Pulse period depending on the environment and use conditions fluctuates, remains with such a device the rate of change or the threshold constant, the or which is a yardstick for deciding on trapping of a foreign body.

Against fluctuations in engine operating characteristics depending on the environment and the conditions of use The measures are therefore not sufficient, so that the Decision "trapping a foreign body" erroneously is taken wisely, even though there is no pinching, or the decision no "pinching a foreign body pers ", although there is a pinch of what leads to incorrect operation of the window.

On the other hand, as with one disclosed in Japanese Patent laying sho 61-64982 described device, are the Measures taken that the window in deciding "Pinching a foreign body" driven in reverse and is opened and also, for. B. to vote the Fen  sters on the environment, the load current of the motor with the increasing frictional resistance between the Au outer edge of the window and the door window sealing frame in the Window frame is enlarged, thereby avoiding that despite no trapping of a foreign body, the Ent divorce "jamming a foreign body" failed becomes.

If, in a concrete sense, the threshold is above loading current when closing the fen sters was detected, then the window pane is reversed driven and at the same time this threshold by the Add one of a predetermined amount of electricity the value increased and renewed.

Since the one added to the threshold and the predetermined one Amount of electricity corresponding value from the environment and ver application controls are independent, but depend on the Amount of electricity also measures such against the Schwankun engine operating characteristics depending on the environment and the conditions of use are not sufficient, so that it will lead to incorrect operation of the window can.

Only after the window has been reversed the increase or the renewal of the threshold, as mentioned above. This can cause user discomfort cause as the enlargement or renewal of the smolder lenwert inevitably the reverse drive of the window needed.

In the case of the Japanese utility model disclosure sho 62-203392 known device is a with the Dre hung the motor impulse from a pulse generator, which is an operating characteristic of the engine puts, introduced into a microcomputer to the changes rate of engine speed determination and this change  comparison rate with a threshold value. Because of of the comparison result is the opening and Closing control of the window.

The rate of change of the engine speed is determined by such a fluctuation in the engine operating characteristic be influenced by external conditions, such as charging voltage, as well as the environment or conditions of use, such as Tem temperature, driving speed, etc., so that a The threshold value remains a malfunction of the Window can cause.

In the known device, therefore, the drawer voltage, temperature, driving speed, etc., of which the malfunction originated, recorded and due to the Er result, the threshold is changed to da to avoid by malfunction.

In practice, however, the engine speed is not of the change of only one of the parameters such as charging voltage, tem temperature, driving speed etc., but from the change influenced at least two parameters. The speed character engine characteristics, from the multiple change of several Parameter is influenced by such speed to distinguish characteristics from changing a Parameter is influenced.

One can say that it depends on a parameter carried out renewal of the threshold not below Use of an immediate physical phenomenon, namely from the speed characteristic of the engine, but only using an indirect physi phenomenon, namely of the charging voltage, the tempera structure or the driving speed.

For this reason, a renewal of the smolder reflects lenwert, in which no change of at least two parameters  ter is considered, the period from the pulse generator given impulse, d. H. the engine speed is not rich again. The decision to get caught by the threshold renewed in this way, leads dangerous also to a wrong decision.

Immediately after the start of the upward movement of the Window pane will also renew the threshold value depends on the charging voltage, the outside air temperature structure or the driving speed. For the case game, when the window is fully open is the threshold worth in many cases immediately after the start of the order upward movement of the window pane of the charging voltage, the Au outside air temperature or the driving speed below different. When deciding on a pinch during the further upward movement of the window pane is hit based on a threshold that is dependent from the charging voltage, the outside air temperature or the Driving speed immediately after the start of the up upward movement of the window pane was renewed, so could this may be a wrong decision.

It is also difficult to change the data generated by a change change of at least two parameters such as the charging voltage, the outside air temperature, driving speed, etc. follow for the speed characteristic of the motor in relation to bring hung.

The inventors focused on the fact that a right decision about a pinch regardless of changing parameters such as charging voltage, etc. is possible is when the renewal of the threshold due to the Operating characteristics of the engine, e.g. B. like the Drehpe period or the speed, carried out directly becomes.

Based on the attention mentioned above, the inventor is  the task based on a device for control the opening and closing of a window in this way that the threshold for deciding on the clamping of a foreign body depending on the instantaneous Chen change the engine operating status in real time again and the renewed threshold in real time is usable.

The task is characterized by the characteristic features of the Claim 1 solved. Another advantageous embodiment mentions are given in claims 2 to 8.

According to the invention, during the upward movement of the window pane ( 12 ), the means ( 40 ) for detecting the operating state of the motor (M) detects the operating state of the motor (M) and the threshold value is changed due to the change in the operating state of the motor (M ) by means ( 141 , 142 ) for setting the threshold value. Then the decision means ( 150 ) compares the change in the operating state of the engine (M) with the threshold value and, based on the comparison result, makes a decision about the trapping of a foreign body in the window. Then, during the upward movement of the window pane ( 12 ), the control means ( 151 , 111 ) controls, based on the decision result by the decision means ( 150 ), the drive of the motor (M) by the drive means ( 20 , 60 ).

In this way, several processes take place in real time, namely the setting of the threshold value due to the change in the operating state of the engine (M), the decision on the trapping of the foreign body in the window by comparing the change in the engine operating state with the threshold value and the drive control of the engine (M) by the drive means ( 20 , 60 ) based on the decision result.

As a result, timely control of the disc window (12) in dependence on the operating state of the engine (M) is possible from the instantaneous change without sterscheibe before adjusting the threshold value, a malfunction of the feet (12) cause.

The threshold value can be directly dependent on the change in the engine operating state in real time are made so that no incorrect decision on a pinch is made.

Also by changing the frictional resistance between the upward moving window and the Door window sealing frame by the secular change the door window sealing frame, the outside temperature change etc. comes from, the operating state of the engine can be changed will.

Since the threshold value according to the invention this change is set, but it is incorrect Decision avoidable.

According to the invention, the means ( 40 , 141 ) for detecting the period of rotation of the motor (M) detects this period of rotation and during the upward movement of the window pane ( 12 ) the threshold value is determined by the means ( 141 , 142 ) to set the threshold. Then the decision means ( 150 ) compares the change in the rotation period of the motor (M) with the threshold value.

According to the invention, the means ( 141 , 142 ) for setting the threshold value reads from the data provided in the storage means ( 50 ) one of the change amounts of the rotation period detected by the above-mentioned means ( 40 , 141 ) and the threshold value corresponding to this change amount. In comparison of the threshold value read with the change in the rotation period detected, the decision means ( 150 ) makes a decision about a foreign object being trapped in the window.

In this way, the threshold value corresponding to the amount of change in the motor rotation period is read from the storage means, which serves as a yardstick for the decision. When the motor rotation period changes during the upward movement of the window pane, the threshold value is correspondingly read again from the storage means ( 50 ) in order to serve as a yardstick for the decision. As a result, an optimal threshold value can be set in real time in accordance with the engine operating state, so that a wrong decision can be reliably avoided.

According to the invention it is provided that the means ( 40 ) for detecting the engine speed detects this and during the upward movement of the window pane ( 12 ) the means ( 141 , 142 ) for setting the threshold value on the basis of the aforementioned Means ( 40 ) detected speed sets the threshold and also the decision means ( 150 ) performs the comparison of the change in the speed detected by the above-mentioned means ( 40 ) with the threshold lenwert.

The following is an embodiment of the invention explained using drawings. Show it:

Fig. 1 shows an embodiment of the invention in block diagram,

Fig. 2 is a side view of the door window of a motor vehicle to which the invention is applied,

Fig. 3, the first half of the flow chart illustrating a method performed with the microcomputer of FIG. 1 main control program,

Fig. 4 shows the second half of the flow chart illustrating a method performed with the microcomputer of FIG. 1 main control program,

Fig. 5 shows the flow chart which is carried out with the microcomputer of FIG. 1 of the engagement program,

Fig. 6, the output from the Hall effect element shown in Fig. 1 pulse shape in control diagram and

Fig. 7 shows a modified embodiment in a flow chart.

Figs. 1 and 2 show an example in which the invention of a motor vehicle window is applied to a device for controlling the opening and closing.

In Fig. 2, 10 denotes a door of the vehicle, on the window frame 11 of which a window with a movable window pane 12 is attached for opening and closing. The window closes or opens with the upward or downward movement of the window pane 12 .

On the inner peripheral edge of the window frame 11 , a door window sealing frame 13 is attached, which clamps the outer peripheral edge of the window pane 12 . The door window sealing frame 13 is not limited to this construction and can also be designed such that it bears from the outside close to the outer peripheral edge of the window pane 12 .

A control device for the opening and closing of the window has a drive mechanism 20 which brings the window pane 12 in up and down movement with the normal and counter-rotation of a motor M.

Furthermore, as shown in FIG. 1, the control device has an actuation switch 30 , a Hall effect element 40 , a microcomputer 50 connected to the actuation switch 30 and the Hall effect element 40 , and a drive circuit 60 connected to it.

By actuation, the actuation switch 30 generates a closing signal or opening signal for closing or opening the window. The Hall effect element 40 he averages the rotation of the motor M and generates a corresponding pulse signal.

When installing the device according to the invention in the vehicle, a main circuit 50 a is connected to a battery B and is used to continuously generate a constant voltage.

The microcomputer 50 is ge by the inclusion of constant voltage from the main circuit 50 a ge in order to perform a main control program according to the flowchart shown in FIGS . 3 and 4 and an intervention control program according to the flowchart shown in FIG. 5. In the main control program, the control for opening and closing the window, the calculation for determining the period change rate of the pulse signal coming from the Hall effect element 40 , etc. are carried out. In the intervention control program, however, the position of the window pane 12 and the period of the pulse signal coming from the Hall effect element 40 are calculated.

In the exemplary embodiment, the microcomputer 50 has a position counter for calculating the window pane position, which is reset when the constant voltage is generated and is then brought into counting operation continuously. Here, the counting range of the position counter corresponds to a rotation range of the motor M, which corresponds to the entire range between the fully opening and fully closing position of the window pane 12 .

If the normal rotation of the motor M and thus the closing operation of the window pane 12 is determined on the basis of the closing signal coming from the operating switch 30 , then the position counter carries out an upward count. If, on the other hand, the counter-rotation of the motor M and thus the opening operation of the window pane 12 is determined on the basis of the opening signal coming from the actuating switch 30 , then the position counter carries out a countdown. Thus, the up-counter or down-counter value of the position counter corresponds to the closing or opening position of the window pane 12 .

By recording a DC voltage, which is generated by switching on an ignition switch IG of the vehicle and supplied by the battery B, the drive circuit 60 is switched on, so that the motor M under control by means of the microcomputer 50 via the drive mechanism 20 to normal or counter-rotation is brought.

The exemplary embodiment designed in this way functions as follows:
Taking the constant, coming from the main circuit 50 a voltage, the microcomputer 50 executes the main control program according to the flow diagram shown in FIGS . 3 and 4. An interruption permission is given in step 100 ( FIG. 3). If the actuation switch 30 is not available, the decision "No" is repeated in step 110 or 160.

If the ignition switch IG is now turned on, then the battery B supplies the drive circuit 60 with the direct voltage, the full opening of the window pane 12 being assumed.

If one now generates the closing signal by means of the actuation switch 30 , then the decision "yes" is made in step 110, assessing that the request for the upward movement of the window pane has been made.

In step 111, a signal for the upward movement of the window pane 12 is emitted. Because of this Aufwärtsbewe supply signal of the drive circuit 60 drives drive mechanics on the 20 to the motor M to the feet begin ster-closing operation.

The Hall effect element 40 determines the rotation of the motor M and outputs a corresponding pulse signal. On the basis of this pulse signal, in the event of an interruption, step 100 starts the intervention control program according to the flow chart shown in FIG. 5. In step 200, it is decided based on the closing signal from the operating switch 30 that the window pane 12 is in the closing mode. Then, in step 210, the position counter performs the up count based on the pulse signal output from the Hall effect element 40 .

In step 220, the time of the interruption caused by the pulse signal of the Hall effect element 40 is then counted by a free-running counter which is built into the microcomputer 12 , the count value being stored in a register which is built into a microcomputer 50 . Here, the counting operation of the free-running counter is started simultaneously with the start-up of the microcomputer 50 .

This intervention control program is repeated with each pulse signal output from the Hall effect element 40 , the count value of the position counter being increased with the upward movement of the window pane 12 , and the difference between a lead value and a lag value of the freewheel counter becomes an interruption distance, namely Period of the pulse signal, which corresponds to the rotation period of the motor M, calculated and stored in the built-in register of the microcomputer 50 .

After such a calculation in step 111, the position of the window pane 12 is read in step 112 based on the count value of the position counter in step 220 of the intervention control program. This is a step that comes immediately after a point in time when the window pane 12 begins to move upward from the fully open position. Therefore, in step 120, the decision "no" is made on the basis of the position read and in step 130 the decision "yes" is made on the basis of the closing signal output by the operating switch 30 .

In step 140, a decision is made as to whether the window pane 12 is in an area in which it may pinch a foreign body. This area is referred to below as the pinching area. This step is a step that comes immediately after a time at which the window pane 12 begins to move upward from the fully open position. Therefore, in section 140, based on the count value of the position counter, the decision " Yes ".

Then, in step 141, the period of the read the pulse signal coming into the register and in Step 142 turns on based on the period read Threshold mi, the relationship between the amount of ΔTi Period and the data table representing the threshold mi 1 read:

Table 1

Table 1 is used in the following way: it is assumed, as shown in FIG. 6, that the lead-in period or lagging period is denoted by tp or tf. Since the follow-up period tf is longer than the lead-up period tp due to the trapping of a foreign body, the threshold value mi is selected in accordance with a period range ΔTi to which the follow-up period tf belongs. If the period ∆Ti z. B. is more than 6.7 ms and less than 7.5 ms, the value m2 is selected as the threshold.

The data in Table 1 are as follows true: It is assumed that the period changes rate a using the pre and post pe riod tp and tf using the formula

α = tp / tf (Formula 1)

can be represented. When pinching one Foreign body is caused by the reduction in motor rotation number the follow-up period tf compared to the lead-up period tp longer, so that the period change rate a is reduced. Therefore, it may, due to the increase or decrease in the Period change rate α, be decided whether the Ein or a foreign object is jammed.

Taking this into account, the scope of the period Ti (i = 1,2.3 ----), which contains the lag period tf, and the threshold value corresponding to this period ΔTi mi (i = 1,2.3 ----) as specified in Table 1.  

Here, the period size ΔTi and the corresponding threshold mi are directly dependent on the change in the rotation period of the motor M, this change being distinguishable from the change in the frictional resistance of the door window sealing frame 13 . The longer or shorter the follow-up period tf, which the period circumference ΔTi contains, the smaller or larger the threshold value mi, which decreases with the increasing value i. The data in Table 1 are stored in the ROM of the microcomputer 50 in advance.

In this way, in step 142 due to the last th follow-up period tf in the register of those containing it Period value ΔTi corresponding threshold mi from the Read data in Table 1.

Then, in step 143, the last one Lead and lag periods tp and tf in the register the pe Period change rate α calculated from Formula 1.

Thereafter, in step 150, this is calculated nete period change rate α with that in step 142 compared its threshold mi. When the period changes rate a is smaller than the threshold mi, then, in Step 150, made the decision "yes", under the assessment division that a foreign body is jammed.

Therefore, in step 151, the downward movement signal for the reverse operation of the window glass 12 is output. Since the motor M is driven by the drive circuit 60 and the window pane 12 is moved downward, as a result of which the foreign body denoted by A in FIG. 2 can be eliminated.

Here, the period range ΔTi and the corresponding threshold mi, as already mentioned above, are directly dependent on the change in the rotation period of the motor M, this change being distinguishable from the change in the frictional resistance of the door window sealing frame 13 .

When the window pane is closed, the Threshold mi for deciding whether to trap the Foreign body depending on the change in operation of the Motors updated in real time to an optimal value and the renewed threshold is used in real time so that precise and timely control is possible depending on this is whether a foreign object is trapped in the window is present or not, and without a wrong decision to pinch a foreign object.

In this window glass closing operation, if the count value of the position counter obtained in step 112 corresponds to the full closed position of the window glass, then the decision "yes" is made in step 120 and in step 121 the output of the upward movement signal is canceled so that the motor M brought to a standstill and the upward movement of the window pane 12 is canceled.

If the opening signal is output by the operating switch 30 when the window pane 12 is closed, then the decision "Yes" is made in step 160 after the decision "No" in step 110. Then the signal for downward movement of the window pane 12 is output in step 161, so that the window pane 12 is also moved downward if necessary. On the basis of the opening signal coming from the actuation switch 30 , the decision is made in step 200 ( FIG. 5) that the window pane 12 is in the opening mode, and in step 210 the position counter carries out the countdown.

If thereafter the count value of the position counter reached in step 162 reaches a value corresponding to the fully open position of the window pane 12 , then the decision "yes" is made in step 170 and then in step 121 the output of the downward movement signal is canceled so that the motor M brought to a standstill and the downward movement of the window pane 12 is lifted up.

Fig. 7 shows a modified embodiment in which the flowchart shown in the above embodiment (see Fig. 4) is partially changed. Otherwise, the features according to FIG. 4 also apply to this modified embodiment.

In this embodiment, too, the period of the pulse signal output from the register of the microcomputer 50 is read in step 141 if the decision "yes" was made in step 140.

Then, in step 141a, the speed of the motor M is calculated on the basis of the pulse signal coming from the Hall effect element 40 . On the basis of the calculated engine speed, a threshold value ni is also read, in accordance with predetermined data, which is referred to below as second predetermined data and represents the relationship between a speed range ΔNi and the threshold value ni.

The second specified data are in place of the in data used in the first exemplary embodiment where at the speed range ΔNi the period size ΔTi and the threshold value ni corresponds to the threshold value mi. Of the Speed range Ni and the threshold ni, the one other, are determined taking into account that the rotation period and the speed of the motor M vice versa returns are proportional to each other. The higher the speed which is in the speed value range ΔNi, the greater  the threshold ni. This increases the Threshold ni with increasing value i.

In step 142a, the second predetermined data a speed range ΔNi selected that the last th follow-up period tf corresponding speed in the register of the motor M, and the corresponding threshold ni is also derived from the second predetermined data read.

Then, in step 143a, as in the previous step given Formula 1, is based on the last preliminary and Overrun speed Np and Nf in the register the speed changes rate β calculated. In step 150a, the on this Way determined speed change rate β with the read a threshold value ni is compared in step 142. If there the speed change rate β is greater than the thresholds worth ni, then in step 150a the decision "yes" taken, assessing that a foreign body is inserted is stuck.

The second embodiment can also same advantages and functions as the first execution example can be achieved.

In the implementation of the invention, it is also possible that instead of the Hall effect element 40, a member for the determination of z. B. the speed, the angle of rotation, the drive current to the motor M is used.

The exemplary embodiments are Application of the invention to an opening device and closing a door window of a motor vehicle. The However, the invention is not based on these exemplary embodiments limits, but also refers to a device to open and close a window on other driving witness or ships applicable, including one  transverse movement of the window pane is conceivable. The threshold value, which in the exemplary embodiments of the Rate of change corresponds to the rotation period of the motor M, can correspond to the rotation period itself.

In the exemplary embodiments, the upward movement of the window pane 12 is determined with the output signal of the actuation switch 30 . But it is also conceivable that a further Hall effect element is provided in addition to the Hall effect element 40 , the upward movement of the window plate 12 being determined depending on whether the phase difference between the two Hall effect elements po is sitative or negative.

In carrying out the invention, instead of the Pe period change rate α use a period change rate α ′ where the denominator and numerator are the peri ode change rate α are reversed. An enlarging Period rate of change α 'represents an entrapment ei foreign body. This also applies to the speed changes rate of increase β.

Each step in the flowcharts at the execution Examples can also be provided by means of hard logic as a means to implement the function.

In each embodiment, a jamming of a foreign body is determined by comparing the ratio of the pre-run period (pre-run speed) to the post-run period (post-run speed) with the predetermined threshold. The object to be compared with the threshold is not limited to this and the following conditions are also possible:
First, a period change rate (speed change rate) is determined for each n successively determined periods (rotational speeds), as in the above-mentioned exemplary embodiments, so that n change rates can be achieved.

Then the sum of the rates of change becomes a Ge total rate of change calculated.

Under such conditions, the pinching can foreign body can be detected by the total change rate with an assigned threshold of the previously entered stored threshold values is compared.

So as the object to be compared are a ver different logic possible.

Reference list

12 window pane
20 drive mechanism
40 Hall effect element
50 microcomputers
60 drive circuit

Claims (8)

1. Device for controlling the opening and closing of a window, characterized by

• a drive means for opening and closing a window by means of a motor,
• a means for detecting the operating state of the engine,
• a renewal means which, depending on the change in the recognized engine operating state, renews a threshold value for deciding whether a foreign body is trapped in the window pane,
• - a means which, depending on the renewed threshold value, decides whether or not there is a foreign object being trapped in the window pane, and
• - A control means for controlling the drive means in dependence on the decision of a pinch.

2. Device according to claim 1, characterized in that a storage means is provided in which several Mo predefined threshold values assigned to the door operating state are stored, the means of renewal depending a smolder from the change in engine operating condition lenwert renewed, from the previously stored Thresholds is extracted. 3. Device according to claim 1 or 2, characterized net that it is a Dre in the engine operating state period of the engine, the threshold to decide whether a foreign body is trapped renewed depending on the change in the rotation period becomes. 4. The device according to claim 3, characterized in that the area of the rotation period, the area of change which contains the rotation period, divided into several areas is, the predefined assigned to each area  Threshold value is stored in the storage means, and that when the engine rotation period changes, the renewal means the threshold for deciding on the A foreign object is jammed in the window by someone Threshold replaced, which the rotation period scope is assigned to which the rotation period after the change is audible. 5. The device according to claim 3, characterized in that the decision-making means for deciding on the inclusion foreign body in the window by comparing the from the means for detecting the operating state of the engine detected rate of change between the last and the current tan recognized rotation period with that of the renewal agent renewed threshold decides whether an entrapment is present or not. 6. The device according to claim 1, characterized in that the engine operating state is a speed of the Mo tors, the threshold for deciding on the trapping of a foreign body depending on the change speed is renewed. 7. The device according to claim 6, characterized in that the speed range, which is the change range of Speed contains, is divided into several circumferential parts, the predetermined smolder assigned to each peripheral part lenwert is stored in the storage means, and that when the engine speed changes, the renewal means the threshold for deciding the pinch foreign object in the window by a threshold value that is assigned to the speed range to which the Speed after the change is associated. 8. The device according to claim 7, characterized in that the decision-making means for deciding on the inclusion foreign body in the window by comparing the  from the means for detecting the operating state of the engine detected rate of change between the last and the current tan recognized speed with the renewed by the renewing agent The first threshold decides whether a pinch occurs lies or not.