JPH0787790A - Method and device for turning off or inverting driving device for movable member of automobile - Google Patents

Abstract

PURPOSE:To create a method and device which turns off or inverts the driving device of the movable member of an automobile and is useful for preventing malfunction more excellently. CONSTITUTION:During diagnosis operation useful for the diagnosis of measuring paths 19 and 22, a known input signal is applied to the input of a measurement path, an actual output signal appearing at a measurement path output based on a known input signal is compared with a specific target output signal which is predicted at the measurement path output when the measurement path operates properly, and then the output signal appearing at the measurement path output during working operation is corrected or the driving device is switched to a trouble operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for turning off or reversing the electric motor of a drive device for driving a movable member (particularly, a movable opening / closing member) of an automobile, which is supplied to the electric motor during operation. The current flowing through the measuring resistor is measured, the voltage dropped in the measuring resistor at this time is evaluated through the measuring path, and when the predetermined threshold is reached, the motor is turned off or switched to the reverse rotation direction. Regarding things.

The invention further relates to a device for implementing a method of this kind, which comprises a measuring resistor through which the current supplied to the electric motor flows during operation and a measuring path connected to the input side of the measuring resistor. And a circuit arrangement which is connected to the output of the measuring path and which turns off the motor or switches it in the reverse direction if a predetermined threshold is reached during operation.

[0003]

2. Description of the Prior Art A method and a device of this kind are known from DE 35 14 223. Structural groups used in motor vehicles are often subjected to extremely severe conditions with respect to mechanical and thermal loads. On the other hand, drives of the type described above are of great safety technical importance, for example, for the fastening of sliding roofs or side windows.

[0004]

The object of the present invention is therefore to create a method and a device of the type mentioned above, which serve for better prevention of malfunctions.

[0005]

The first technical means of the present invention for solving this technical problem drives a movable member (11.30) of an automobile (particularly, a movable opening / closing member). A method for turning off or reversing the electric motor (12) of a drive for driving a current supplied to the electric motor during operating operation through a measuring resistor (19), whereupon it drops at the measuring resistor. The voltage is evaluated via the measuring path (19, 22), and when the predetermined threshold value is reached, the motor is turned off or switched in the reverse rotation direction.
During a diagnostic operation that is useful for diagnosis of (9, 22), a known input signal is applied to the measurement path input, the actual output signal that appears at the measurement path output based on the known input signal, and the measurement path when the measurement path operates correctly Characterized in that the output is compared with a predetermined target output signal expected and, depending on the comparison, the output signal appearing in the measured path output during the operation is corrected or the drive is switched to a troubled operation. . Further, the second technical means of the present invention is characterized in that, during the diagnostic operation, when the electric motor (12) is turned off, a predetermined current is sent through the measuring resistor (19).

A third technical means of the present invention is characterized in that a predetermined voltage is applied to the measurement path input during the diagnostic operation. A fourth technical measure of the invention is a measuring resistor (19) through which the current supplied to the electric motor (12) flows during operation.
And a measuring path (22) connected to the input side of the measuring resistor
And a circuit device (20, 24, 33) connected to the output of the measurement path and for turning off the electric motor or switching to the reverse rotation direction when a predetermined threshold value is reached during the operating operation, during the diagnostic operation. A diagnostic signal generator (21, 36) that applies a known input signal to the measurement path input; an actual output signal that appears at the measurement path output based on the known input signal, and a measurement path output when the measurement path operates correctly An evaluation device (24, 33) for comparing the expected output signal with the expected output signal; a correction device (24) for correcting the output signal appearing at the measured path output during the operating operation and / or during the diagnostic operation, depending on the comparison. And a switching device (33) for switching the drive device to the trouble operation when the deviation of the actual output signal from the target output signal is excessive.
Is characterized by.

A fifth technical means of the invention is that the diagnostic signal generator comprises a constant current source (21) which can be connected to the measuring resistor (19) if the motor is switched off during diagnostic operation. Is characterized by. A sixth technical measure of the invention is characterized in that the diagnostic signal generator comprises a constant voltage source (36) which can be connected to the measuring path input during diagnostic operation.

A seventh technical means of the present invention is a scanning / holding device (in which a correction device (24) is connected to a measurement path output and detects and stores an actual output signal of the measurement path obtained during a diagnostic operation ( 25) and a correction stage (26) which receives the output signal of the scanning and holding device (25) and the signal appearing at the output of the measuring path (22) during operation and derives a modified output signal from both signals. ) And.

The eighth technical means of the present invention is a scanning / holding device (in which a switching device (33) is connected to a measurement path output and detects and stores an actual output signal of the measurement path obtained during a diagnostic operation ( 25) and the output signal of the scanning / holding device,
When the output signal of the scanning / holding device is outside the range defined by the window comparator, it has a window comparator (34) for generating an output signal for switching to trouble operation.

[0010]

[Operation] During diagnostic operation that is useful for diagnosing the measurement path, a known input signal is applied to the measurement path input, and the actual output signal that appears at the measurement path output based on the known input signal and the measurement when the measurement path operates correctly The road output is compared with the expected target output signal and, depending on the comparison, the output signal appearing at the measured road output during the operating operation is corrected or the drive is switched to a trouble operation.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 is a system configuration diagram of an embodiment of an apparatus according to the present invention. FIG. 2 is a drawing of another embodiment of the device according to the present invention. In FIG. 1, the electric motor 12
1 schematically shows a sliding roof with a cover 11 drivingly connected to it. When the electric motor 12 is operated, the cover 11
Can be selectively placed in the closed position shown in FIG. 1 or in a position that at least partially opens the roof opening 13. The terminals of the electric motor 12 are connected to the switching contact 14 of the relay 15 and the switching contact 16 of the relay 17. In the illustrated positions of the switching contacts 14, 16, the motor terminals are short-circuited to one another.

When the relay 15 is activated, a current in one direction is applied to the electric motor 12 from a power source 18 (for example, a car battery). On the other hand, when the relay 17 is activated,
Current flows from the power source 18 through the motor 12 in the opposite direction. Correspondingly, the electric motor 12 rotates in either rotation direction. The measuring resistor 19 is provided in series with the electric motor 12. When the electric motor 12 is operating, the measuring resistor 19 causes the electric motor 12 to
And the voltage U as a function of the current through the measuring resistor 19
x descends.

During operation, that is to say during movement of the cover 11 by means of the electric motor 12, a signal which depends on the measured voltage Ux reaches the monitoring and control device 20. The cover 11 bumps into an obstacle, thus increasing the motor current and measuring voltage Ux.
When the danger of consolidation is reported by a corresponding increase in
The device turns off the electric motor 12 based on the signal. Instead of this, the electric motor 1 is connected via relays 15 and 17.
2 can be switched in the reverse rotation direction.

When the electric motor 12 is turned off during the diagnostic operation,
A predetermined current is supplied from the constant current source 21 via the measuring resistor 19. Since this current is known, the measurement result obtained at the measurement path end can be verified for its accuracy and interpreted accordingly. For example, the measured value can be modified. Alternatively or additionally, the drive can be turned off if the deviation is excessive.

In the embodiment of FIG. 1, the measuring resistor 19 is followed by a measuring amplifier 22. A switch 23 is provided between the measuring resistor 19 and the constant current source 21 and is opened during the operation and closed during the diagnostic operation. Between the measuring amplifier 22 and the monitoring and control device 20, a correction device, indicated generally by 24, is provided. The correction device 24 comprises a scan and hold amplifier 25 and a correction stage 26.

For diagnosis, a signal is sent on line 27, switch 23 is closed, while motor 12 is turned off. A constant current source 21 applies a predetermined current to the measuring resistor 19. The voltage drop across the measuring resistor 19 at this time is supplied to the measuring amplifier 22. The output signal of this amplifier reaches a scan and hold amplifier 25 which is operated by the line 27 for signal holding. At the output of the scan and hold amplifier 25, the signal XRef sent to the correction stage 26 appears. In the correction stage 26, the numerical value XRef measured during the diagnosis is combined with the numerical value XSoll, which is the expected measurement value during the diagnosis. This value XSoll results from the characteristic values of the measuring resistor 19, the constant current source 21 and the measuring path including the measuring amplifier 22. The correction stage forms a correction factor XSoll / XRef from the numerical values XRef and XSoll.

During the operation operation subsequent to the diagnostic operation, the switch 23
Is opened. The current flowing through the electric motor 12 is detected via the measuring resistor 19. At the output of the measuring amplifier 22, the numerical value XIst measured during the operating operation appears. Track 2
On the basis of the control signal supplied via 7, the actuating value XIst has no effect on the scanning and holding amplifier 25. However, in the correction stage 26, since the numerical value XIst is multiplied by the correction coefficient XSoll / XRef, the correction stage 26
At the output of the corrected measurement XKor appears. This modified measured value XKor is applied to the monitoring and control device 20.

In the case of the embodiment shown in FIG. 2, the electric motor 12 is provided as a drive device for the side window 30 of the automobile.
As in the case of the embodiment of FIG.
It is connected to a power source 18 via switching contacts 14 and 16 of 5 and 17. The relays 15, 17 are triggered by the monitoring and control device 20 as a function of the voltage drop Ux across the measuring resistor 19 or, preferably, the measured value, which is the rate of change of the voltage. The measuring resistor 19 includes a measuring resistor 1
A resistor 31 having a resistance value larger than the resistance value of 9;
32 is connected.

The inputs of the measuring amplifier 22 are resistors 19, 3
1 connected in series. In the measurement amplifier 22,
As in the embodiment of FIG. 1, a scanning / holding amplifier 25 is added afterwards. However, in this case, the amplifier is part of the switching device 33. The switching device 33 further includes a window comparator 34. In this case as well, a signal for switching between the operating operation and the diagnostic operation is sent via the line 27. This signal is supplied to the switch 23 and the scan / hold amplifier 25.

During operation, the switch 23 is opened. If there is a risk of solidification when the side window 30 is closed, the voltage drop across the measuring resistor 19 and the motor 12
A signal, which is a function of the current flowing through it, is applied from the measuring amplifier 22 to the monitoring and control device 20, whereby the electric motor 1
2 is turned off or the rotation direction of the electric motor is switched. During the diagnostic operation, the switch 23 is closed by a control signal sent via the line 27. As a result, the resistor 1
A constant voltage source 36 is connected to the series circuit of 9, 31, 32. Voltage provided from constant voltage source 36 and resistor 1
The resistance values of 9, 31, 32 are matched to each other, so that at the input side of the measuring amplifier 22, a reference equal to or approximately equal to the measuring voltage applied to the measuring amplifier 22 when the operation of the circuit is perfect. The voltage URef is applied. Correspondingly, the reference value XRef appears at the input of the scan and hold amplifier 25. As long as there is no malfunction in the current measurement path, the above values are
During operation, it is equal to or at least approximately equal to the value XIst sent from the output of the measuring amplifier 22 to the monitoring and control device 20. The window comparator 34 determines the lower limit value Xmin and the upper limit value Xmax.

When the following condition Xmin <XRef <Xmax is not satisfied, the off signal is output from the window comparator 34.
Is sent to the monitoring / control device 20. Therefore, X
If a deviation appears in the current measuring path that exceeds the tolerance limits determined by min and Xmax, the drive is deactivated.

Many variations are possible within the framework of the invention. For example, in combination with the circuit configuration of FIG. 1, instead of the constant current source 21, the associated resistors 31, 32
It is also possible to provide a constant voltage source 36 having On the contrary, in the circuit arrangement of FIG. 2, the constant current source 21 can be used instead of the constant voltage source 36 having the resistors 31, 32. Furthermore,
A correction device 24 and a switching device 33 can be connected to the measuring amplifier 22.

[0023]

By the method and apparatus according to the present invention,
Malfunctions of the measuring path or deviations exceeding a predetermined tolerance limit can be reliably detected, and in some cases corrections can be made or the drive system can be switched to trouble operation. Corresponding to an embodiment of the invention, during diagnostic operation, if the motor is turned off, a predetermined current can be supplied via the measuring resistor, so that the diagnostic signal generator causes the motor to turn off during the diagnostic operation. A constant current source that can be connected to the measuring resistor if

However, corresponding to another embodiment, a predetermined voltage can be applied to the measuring path input during the diagnostic operation. For this reason, the diagnostic signal generator can have a constant voltage source which can be connected to the measuring path input during diagnostic operation. In the case of this embodiment, a relatively large output loss due to the structure of the constant current source can be easily avoided when the load current is large. According to another embodiment of the invention, the correction device is connected to the measuring path output and detects the actual output signal of the measuring path determined during the diagnostic operation,
Having a scanning and holding device for storing and a correction stage for receiving the output signal of the scanning and holding device and the signal appearing at the output of the measuring path during operating operation and for deriving a corrected output signal from both signals. You can

Thus, even if an erroneous operation (for example, a deviation exceeding the tolerance limit) appears on the measurement path, the driving device can be kept in a perfectly functional state. However, alternatively or additionally, the switching device is connected to the measuring path output,
When the scanning / holding device that detects and stores the actual output signal of the measurement path obtained during diagnostic operation and the output signal of the scanning / holding device are supplied, and the output signal of the scanning / holding device is determined by the window comparator Can have a window comparator that produces an output signal for switching to trouble operation. As a result, if an excessive deviation appears on the measurement path,
The function of the drive can be adjusted.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing another embodiment.

[Explanation of symbols]

 11 cover 12 electric motor 19 measuring resistor 20 monitoring / controlling device 21 constant current source 22 measuring amplifier 24 correcting device 25 scanning / holding amplifier 26 correcting stage 33 switching device 34 window comparator 36 constant voltage source

Claims (8)

[Claims] 1. A method for turning off or reversing an electric motor (12) of a drive device for driving a movable member (11.30) of an automobile (in particular, a movable opening / closing member), the electric motor being in operation. Measure the current supplied to the resistor (1
9), the voltage dropped in the measuring resistor at this time is evaluated via the measuring path (19, 22), and when the predetermined threshold value is reached, the motor is turned off or switched to the reverse rotation direction. During a diagnostic operation that is useful for diagnosing the measurement path (19, 22), a known input signal is applied to the measurement path input, and the actual output signal that appears at the measurement path output based on the known input signal and the measurement path are correct. Compared with the predetermined target output signal expected on the measured path output when activated, and depending on the comparison, either correct the output signal appearing on the measured path output during the operating run or put the drive into trouble operation. A method for turning off or reversing the drive of a moving member of a motor vehicle, characterized by switching. 2. The movable member of a motor vehicle according to claim 1, wherein a predetermined current is sent through the measuring resistor (19) when the electric motor (12) is turned off during the diagnostic operation. How to turn off or reverse the drive. 3. The method according to claim 1, wherein a predetermined voltage is applied to the measurement path input during the diagnostic operation. 4. An apparatus for carrying out the method according to claim 1, comprising a measuring resistor (19) through which a current is supplied to the electric motor (12) during operation and a measuring resistor. Circuit (22) connected to the input side of the device and a measurement path (22) connected to the output of the measurement path and for turning off the motor or switching to the reverse rotation direction when a predetermined threshold value is reached during operation.
0, 24, 33) and a diagnostic signal generator (21, 36) for applying a known input signal to the measuring path input during diagnostic operation; and a measuring path output based on the known input signal. An evaluation device (24, 33) for comparing the actual output signal that appears with the target output signal that is expected in the measured path output when the measured path operates correctly; and, depending on the comparison, the measured path output during working operation. A correction device (24) for correcting the output signal appearing in the output and / or a switching device (33) for switching the drive device to the trouble operation when the deviation of the actual output signal from the target output signal is excessive during the diagnostic operation. A device for turning off or reversing the drive of a movable member of a car. 5. The diagnostic signal generator according to claim 4, characterized in that it has a constant current source (21) which can be connected to the measuring resistor (19) if the motor is switched off during diagnostic operation. Device for turning off or reversing the drive unit of the movable member of the automobile. 6. The drive of a movable member of a motor vehicle according to claim 4, characterized in that the diagnostic signal generator has a constant voltage source (36) which can be connected to the measuring path input during diagnostic operation. Or a device that flips. 7. A correction device (24) is connected to the output of the measuring path and detects the actual output signal of the measuring path obtained during diagnostic operation,
Scanning / holding device (25) for storing and output signal of scanning / holding device (25) and measuring path (22) during operating operation
7. A movable member of a motor vehicle according to any one of claims 4 to 6, characterized in that it has a correction stage (26) for receiving a signal appearing at the output of the device and for deriving a modified output signal from both of these signals. A device that turns off or reverses the drive of 8. A switching device (33) is connected to the output of the measurement path and detects an actual output signal of the measurement path obtained during diagnostic operation,
An output that receives supply of the scanning / holding device (25) to be stored and the output signal of the scanning / holding device, and switches to trouble operation when the output signal of the scanning / holding device is outside the range determined by the window comparator. A window comparator (34) for generating a signal.
A device for turning off or reversing the drive unit for the movable member of the vehicle according to any one of items 1 to 7.