DE102005044147A1 - Electromechanical adjusting device movement controlling method for motor vehicle, involves calculating adjusting movement, which is carried out before or during previous stopping of vehicle, and storing movement in non-volatile memory - Google Patents

Abstract

Method for controlling the adjustment movement of an electromechanical adjustment device in a vehicle, in which a trapping detection system (15) continuously determines an actual adjustment force (6) in a section (11) of the adjustment path during an adjustment movement and this with corresponding reference values that represent a maximum permissible adjustment force and which are stored in the form of a reference characteristic curve (8) in a non-volatile memory (2), compares and causes the adjustment movement to stop or its direction of movement to reverse if an actual adjustment force value exceeds a corresponding reference value and has a filter device (14) which causes the trapping detection system (15) to switch to an increased sensitivity when the vehicle is at a standstill, the filter device (14) detecting trapping for a current adjustment movement that is carried out when the vehicle is at a standstill System (15) causes reference values of a reference characteristic curve to be used which were previously calculated during a previous adjustment movement carried out when the vehicle was at a standstill and stored in the non-volatile memory (2).

Description

technical area

The The invention relates to a method for controlling a power-operated closing part, in particular a motor-driven window or sunroof in a motor vehicle in which a pinch detection system is provided, the effect of which is controlled by a filter device.

State of the art

electromechanical Adjustment devices are used, for example, in motor vehicles for power-operated windows, Sunroof adjustments or other closing parts used. They persist usually from an electric motor, a transmission gear and a electrical control unit.

Around to prevent that while an adjustment movement people come to harm, that is body parts by inadmissible high pinching forces is injured, for safety reasons one Protection device, a so-called. Anti-trap prescribed. This Pinch protection is usually provided by a microcomputer system implemented a corresponding algorithm and corresponding peripherals. While an actuation of the Drive motor detects this Einklemmerkennungsungssystem that of the drive motor applied instantaneous adjustment and compares them with a reference specified in the system, a so-called triggering threshold. exceeds at a position of the adjustment the currently determined adjustment through the triggering threshold predetermined maximum allowable Limit value, the drive motor is stopped, or its direction of rotation vice versa, so that one, clamped between adjusting and counter-position Obstacle, for example a body part, which is trapped between a vehicle window and a door frame, not squeezed but released.

to Determining the current displacement force find preferred indirect Measuring methods application. They use For example, the correlation between the motor current or the engine speed and the adjustment force prevails. By the Detecting such a correlation variable, it is possible the current adjustment force to calculate, without a costly Force sensor would be required.

The to be overcome in an adjustment of the electric drive Drag is along the Verstellweges not constant and also exposed to interference, which - depending on whether the motor vehicle is driving or at rest - varies greatly affect the detection of the adjusting force.

The Cause of these disorders is on the one hand in systemic disturbances. This system immanent Be disturbing variables for example, by acting in the adjustment range binding, by Imbalance or due to tolerance and aging of mechanical drive parts caused. Each drive system has an individual transmission characteristic, which are during the service life continuously changes.

To the Others act on the adjustment in a car both at Ride as well as standstill extremely rough Operating conditions, for example large temperature fluctuations, Wet, icing and pollution. Especially when driving over a poor road act on the body of the vehicle vertical accelerations, the size Disturbance amplitudes cause.

If Peak values of these stochastic disturbances one by an envelope exceed the preset threshold value of the adjustment force, it may happen that the Einklemmerkennungssystem automatically reversing a drive triggers. This means that, for example, when driving over a Bad roadway can not close a vehicle window, but because of the erroneous Obstacle detection reopens after a certain point. Of the The driver of the vehicle can be irritated by this, so he from the Driving is distracted. Driving safety is then impaired.

Around an unintentional response of the anti-jamming protection of an electrical Operated vehicle window to prevent are so-called. Badwegstreckenfilter known. These poor path line filters perform a temporal during a setting process Filtering the correlation size by and hold a false trip a movement process back, by detecting by filtering if it is random Fluctuation or trapping. It is about purely random fluctuations, caused for example by vertical accelerations when driving over a bad road, this is the triggering threshold increased, which increases the sensitivity of the Einklemmerkennungssystems reduced. This will cause an unwanted self-opening of a Vehicle window countered.

On the other hand, in the case of the stoppage of the motor vehicle, in which children may play unnoticed in the motor vehicle with the power-operated window lifter, there is an increased risk of injury. To the injury risk in To keep this case as low as possible, the Einklemmerkennungsungssystem must react here with the highest possible sensitivity.

To solve this problem, is in the EP 1 116 313 B1 proposed to completely disable the bad road filter in a car as soon as the system is detected a stoppage. Turning off the poor path filter will return the system to normal sensitivity.

One Lowering the permissible But pinching force can cause that when closing a vehicle window opened when the vehicle is stationary Pinching protection responds. The locking security is then not guaranteed.

representations the invention

It It is an object of the present invention to provide a method of control an adjustment in a car to indicate that at standstill of the vehicle while maintaining the highest possible anti-jamming guaranteed is that independent from external influences and different resistances in the adjustment range as required the operator with sufficient adjusting an opening or Shut down the sliding element possible is.

These The object is achieved by a method having the features of the patent claim 1 solved. Advantageous embodiments are the subject of dependent claims.

According to the invention is provided that at standstill of the motor vehicle, a filter device is active, which causes the pinch detection system to reference values to use a reference characteristic previously, during a previous, made at standstill of the vehicle adjustment movement, determined by averaging and non-volatile Memory were saved.

Thereby is achieved that at an adjusting the at standstill carried out of the vehicle reference values are used which is connected to the current state of the system at a previous Standstill are adapted. For example, joined a certain one Position of a previous, performed at standstill adjustment a binding at one point, so in the current closing process this is considered. The drive system then generates an adjusting force according to the invention, enough is great about this binding to overcome. Secondly, updating the reference ensures that that the clamping force at this point to a predetermined low Limited measure is and the distance between the current increased adjusting force and the triggering threshold enough is great so that the locking security guaranteed is.

Summary the drawings

to further explanation The invention will be described in the following part of the description of the drawings Reference is made in which further advantageous embodiments, details and further developments of the invention can be found.

It shows:

1 a block diagram of an adjusting device, such as is commonly used in a motor vehicle;

2 an adjusting force diagram;

3 a details X in the diagram of 2 in an enlarged view.

Execution of the invention

In the 1 is a block diagram of the adjusting device according to the invention drawn, as it is commonly used for an electromechanical window regulator in a motor vehicle. The adjusting device is in the whole by the reference numeral 1 characterized. A power electronic module 13 controls the electric motor, which is arranged in a vehicle door, to adjust a window pane between an open position S1 and a closed position S4. The motor is connected in the shunt branch of a bridge circuit with semiconductors, which specify the motor current. The semiconductor switches are controlled by control signals of a control and regulating device 3 controlled, in turn signal leading, for example via a bus, with an operating device 4 , a filter device 14 and a nonvolatile memory 2 connected is. In a closing operation by the operating device 4 is triggered, the anti-trap within the adjustment S2 to S3 is effective. The pinch detection system 15 is dimensioned so that the force is limited to an obstacle with a diameter between 4 millimeters and 200 millimeters to a maximum of 100 Newton. In 1 is with the reference numeral 5 a standstill detector is characterized, which detects the stoppage of the vehicle.

In the 2 is plotted on the abscissa of the displacement s and on the ordinate of the current absorbed by the motor. As described above, the motor current I forms a correlation variable to the driving force, that is to the adjusting force with which the window pane is adjusted along the stroke s. With the reference number 6 a curve is displayed that shows the instantaneous values of a current adjustment process. The adjustment process begins at point S1 and ends at S4. The course of the adjusting force 6 initially rises relatively steeply because of the breakaway torque to be overcome and the inertia of the moving parts to be accelerated, in particular the armature of the motor. In the further course it comes to a drop to Verstellkraftwerte that are required to maintain the movement process. When the adjustment S3 is reached, the inlet begins in the rubber seal of the door frame and the force curve rises steeply again. The end of the movement is reached at S4. The course of the actual adjusting force 6 is subject to a noise component. The cause of this noise component here are the irregularities inherent in the drive chain.

In 2 is with the reference numeral 7 denotes a Verstellkraftverlauf, which is detected during initialization of the system factory in the form of a learning curve and then adapted continuously during operation.

The stroke s is in juxtaposed sections 11 divided. In one of these sections 11 is a temporary binding with a sturgeon tip 9 characterized. The Störspitze 9 is from the adjusting force limit 8th through a distance 15 complains, but comes dangerously close to this.

During an adjustment process, a comparison between a current value is continuously carried out 7 the actual adjusting force 6 and a predetermined triggering threshold, which in 2 with the adjusting force limit 8th is drawn. Exceeds a value of the curve 7 the corresponding, by the limit curve 8th predetermined threshold, so the Einklemmerkennungssystem stops 15 the electric motor or rotates its direction of rotation. This ensures that a maximum permissible force on an obstacle is not exceeded in the way. The size of this pinching force 10 results from the difference between the current adjustment force 6 and the triggering threshold 8th , The pinching force 10 is thus the force that is exerted on the obstacle in the event of pinching. she is in 2 with the arrow 10 characterized.

During a closing process takes place in each of the sections 11 an averaging of the current course of the adjustment. The mean values are in their assignment to the respective section 11 in a non-volatile memory 2 the storage device 14 Saved: As soon as a current closing operation is completed, the pinch detection system analyzes 15 the adjusting force curve 7 , This displacement force curve corresponds to an expected displacement force curve 7 for a subsequent closing process. If the pinch detection system detects that a mean value formed in this way 7 ' a predetermined limit to a previous value of the curve 7 has exceeded, the adjusting force limit 8th adapted to this new situation.

In the simplest case, this adaptation can consist in the fact that the adjusting force limit 8th is moved parallel to the abscissa. The curve 7 and the curve 8th are then identical in terms of history.

However, according to another embodiment of the invention, the adaptation may also be that in this section 11 a new value pair of the characteristic sections 7 ' and 8th' (please refer 3 ) and this section 11 is assigned. The distance 10 ' between these two characteristic curves 7 ' and 8th' again corresponds to the predetermined maximum permissible pinching force 10 ,

The in the non-volatile memory device 2 stored values of the adjusting force curve 7 So reflect a power demand, as expected for a future closing process at a standstill. The factory-made initialization thus loses its importance with the service life. In their place is the last state of the drive device.

compilation the reference numerals used

1

adjustment

2

Storage device, nonvolatile Storage

3

Control-regulating device

4

operating device

5

Stop detector

6

actual Verstellkraftverlauf

7

expected Verstellkraftverlauf

7 '

Characteristic section of 7 , Average

8th

Reference characteristic, Adjusting-border demarcation

8th'

Characteristic section of 8th

9

disturbers tips

10

trapping

10

distance

11

section

12

arrow

13

power electronics control

14

filtering device

15

Einklemmerkennungssystem

Claims (6)

Method for controlling the adjustment movement of an electromechanical adjusting device in a vehicle, in which a pinching detection system ( 15 ) during an adjustment movement continuously one, each in a section ( 11 ) of the adjustment actual displacement force ( 6 ) and this with corresponding reference values which correspond to a maximum permissible adjustment force and which in the form of a reference characteristic ( 8th ) in a nonvolatile memory ( 2 ) compares and causes the adjustment movement to stop or the direction of its movement to reverse, provided that an actual adjustment force value exceeds a corresponding reference value, and a filter device ( 14 ) having the pinch detection system ( 15 ) causes the vehicle to be switched to increased sensitivity when the vehicle is at a standstill, characterized in that, in the case of a current adjustment movement, which is carried out when the vehicle is at a standstill, the filter device ( 14 ) the pinch detection system ( 15 ) is used to use reference values of a reference characteristic previously calculated during a preceding adjustment movement made when the vehicle is stationary and stored in non-volatile memory ( 2 ) were saved. Method according to claim 1, characterized in that the filter device ( 14 ), each one of the sections ( 11 ) of the adjustment path associated, actual adjustment force value by averaging off in each section ( 11 ) sampled, registered instantaneous values of the adjusting force and in the non-volatile memory ( 2 ) stores. A method according to claim 2, characterized in that the reference characteristic used in a current adjustment process is chosen so that in each section ( 11 ) the difference between a Verstellkraft value pair formed from a stored actual Verstellkraftwert-characteristic line ( 7 ' ) and a corresponding reference value characteristic section ( 8th' ), a predetermined pinching force ( 10 ) does not exceed. A method according to claim 2, characterized in that in a current adjustment, the reference characteristic ( 8th ) is selected so that a distance of 20 percent of the clamping force ( 10 ) to the highest peak ( 9 ) of a preceding adjustment process is selected. Method according to one of claims 1 to 5, characterized the averaging is done by an algorithm, the one smoothing member with low-pass filter maps and at least partially in the control device is stored. Method according to one of claims 1 to 6, characterized that for determining the stoppage of the vehicle - respectively for themselves or in combination - through turning off the ignition, the closed position the doors, the operation the brake pedal, or used by a seat occupancy detection system becomes.