DE102015211106A1 - Method for operating an electromotive position indicator for a sunroof system in a motor vehicle - Google Patents

Abstract

The invention relates to a method for modeling a temperature of an electromechanical position indicator (24) for operating a sunroof (22) in a sliding roof system (2) of a motor vehicle, comprising the following steps: - providing a counter (28) having a counter value which determines the temperature of the vehicle Positioner (24) represents; - When the positioner (24) is deactivated, changing the counter value of the counter (28) according to a predefined cooling curve and depending on a position of the sunroof (22).

Description

Technical area

The invention relates to sliding roof systems for motor vehicles, in particular measures for the thermal protection of electromotive encoders for operating sliding roof systems.

Technical background

Sunroof systems typically include an electromotive encoder to drive the sunroof to automatically open or close. The electromotive positioners are designed due to the limited space so that they can be operated in a direct sequence a certain number of cycles without overheating occurs. The currently used electromotive encoders often rare earth magnets are used, which have a high temperature sensitivity. In particular, they must not heat above a temperature of, for example, 105 °, since otherwise they will lose their magnetization and the positioners will lose their efficiency.

Since, for reasons of cost, the electromotive positioners are not provided with temperature sensors, thermal protection is implemented by an algorithm which evaluates the operating times of the electromotive position indicator. In particular, in the algorithm, the current temperature is modeled based on the power loss of the position indicator during its operating time. A defined cooling curve of the electromotive positioner is assumed. If the modulated temperature of the positioner is too high, the activation is blocked until the modeled temperature allows a safe restart of the operation. As a result, u.U. the availability of the position indicator and thus the sunroof system be restricted.

It is an object of the present invention to determine the temperature of the electromotive positioner precisely and thus to increase its availability.

Disclosure of the invention

This object is achieved by the method for operating an electromotive position indicator for a sliding roof system in a motor vehicle according to claim 1 and by the control device, the position encoder system and the sliding roof system according to the independent claims.

Further embodiments are specified in the dependent claims.

• – Bereitstellen eines Zählers mit einem Zählerwert, der die Temperatur des Stellgebers repräsentiert;
• – bei deaktiviertem Stellgeber, Ändern des Zählerwerts des Zählers entsprechend einer vordefinierten Abkühlkurve und abhängig von einer Stellung des Schiebedachs.

According to a first aspect, a method for modeling a temperature of an electromechanical position indicator for operating a sunroof in a sunroof system of a motor vehicle is provided, comprising the following steps:

• - Providing a counter with a counter value representing the temperature of the positioner;
• - If the positioner is deactivated, changing the counter value of the counter according to a predefined cooling curve and depending on a position of the sunroof.

One idea of the above method is, in sunroof systems in which the electromotive positioner is flushed in an open position of the sunroof of incoming ambient air, to take into account the additional cooling caused by the implementation of a thermal protector. For this purpose, it was found that even a small opening position of the sunroof can result in a flow around the electromotive positioner, which leads to an additional cooling capacity.

In contrast to conventional thermal protection methods, where a constant cooling curve is applied during the times when the actuator drive motor is deactivated, the method proposed above also provides for cooling due to the airstream. In order not to have to provide different cooling curves for different vehicle speeds, which would result in an increased storage cost, it is therefore intended to modify the predetermined fixed cooling curve.

The above method allows a higher availability of the electromotive position sensor, since the modeling of the temperature of the position sensor is more accurate, since this takes into account the circulating wind.

Furthermore, when the positioner is deactivated, the counter can be changed according to a predefined cooling curve. If an open position of the sunroof is determined for a certain period of time, the counter value may be applied with a correction value representing a predetermined additional cooling of the position indicator.

In particular, when the positioner is deactivated, the counter can be decremented according to a predefined cooling curve, wherein, if an open position of the sunroof is determined for a certain period of time, the counter value is reduced by a correction value representing the predetermined cooling of the position indicator.

It can be provided that the height of the correction value is determined as a function of a vehicle speed.

In particular, the amount of the correction value may be determined depending on which of one or more speed ranges the vehicle speed is for a specific time period associated with the respective speed range.

According to one embodiment, the height of the correction value can be determined depending on the duration of the open position after a deactivation of the position indicator or after a last loading of the counter value with the correction value.

Furthermore, the height of the correction value can be specified depending on a position of the sunroof.

It can be provided that the counter value is initially provided with an initial value which is fixed or dependent on an ambient temperature.

According to a further aspect, a method for operating a sunroof system is provided, wherein depending on the counter value determined according to the above method, a blocking or interruption of an activation of the position indicator is performed, in particular depending on the result of a threshold comparison.

• – einen Zähler mit einem Zählerwert bereitzustellen, der die Temperatur des Stellgebers repräsentiert, und
• – bei deaktiviertem Stellgeber den Zählerwert des Zählers entsprechend einer vordefinierten Abkühlkurve und abhängig von einer Stellung des Schiebedachs zu ändern.

According to another aspect, there is provided an apparatus for modeling a temperature of an electro-mechanical actuator for operating a sunroof in a sunroof system of a motor vehicle, the apparatus being configured to:

• To provide a counter with a counter value representing the temperature of the modulator, and
• - If the positioner is deactivated, change the counter value of the counter according to a predefined cooling curve and depending on a position of the sunroof.

• – die obige Vorrichtung,
• – ein Schiebedach zum Öffnen oder Schließen einer Dachöffnung; und
• – einen elektromechanischen Stellgeber zum Antreiben des Schiebedachs.

In another aspect, a sunroof system for a motor vehicle is provided, comprising:

• The above device,
• - a sliding roof for opening or closing a roof opening; and
• - An electromechanical actuator for driving the sunroof.

Furthermore, the positioner can be arranged so that it can be flushed or flowed around in an open position of the sunroof of ambient air.

Brief description of the drawings

Embodiments will be described below with reference to the accompanying drawings. Show it:

1 a schematic representation of a sliding roof system for a motor vehicle;

2 a schematic representation of a control device for an electromotive encoder in the sunroof system of 1 ;

3 an exemplary cooling curve for a conventional positioner system; and

4 an exemplary cooling curve with a modification due to a flushing of the positioner with ambient air for a predetermined period of time.

Description of embodiments

1 shows a schematic representation of a vehicle roof 1 with a sunroof system 2 , The sunroof system 2 has one in the vehicle roof 1 located roof opening 21 on, in which there is a movable sunroof 22 located in 1 is shown in a closed position. The sunroof 21 is when opened in a receiving area 23 in a rear part of the vehicle roof 1 moved to the roof opening 21 to open.

Moving the sunroof 22 takes place with the aid of an electromotive positioner 24 who has a suitable mechanics 25 so with the sunroof 22 is coupled, that upon rotation of a drive motor of the electromotive encoder 24 a translational movement of the sliding roof 22 to open or close the roof opening 21 is effected.

The electromotive positioner 24 is essentially at a rear end of the roof opening 21 arranged, ie behind a rear with respect to a forward direction of travel of the motor vehicle edge 26 the roof opening 21 , While in the closed state, the sunroof 22 and the outer surface of the vehicle roof 1 form a closed substantially airtight surface, when opening the sunroof 22 for moving into the receiving area 22 this moves downwards at its rear edge and thereby the receiving area 23 open to the environment. Because the positioner 24 over the recording area 23 usually openly accessible, when the motor vehicle is moving in the forward direction, Ambient air as a wind the electromotive positioner 24 flow around or rinse and thus an additional - in the closed state of the sunroof 22 non-existing - achieve cooling effect.

Alternative sunroof systems 2 can also be a method of sunroof 22 along the outside of the vehicle roof 1 provide. In this case, the sunroof will open 22 at its rear edge first upwards and then moved backwards. Even with such constructions, ambient air can drive the motorized positioner during a drive of the motor vehicle 24 flow around or rinse and thus an additional - in the closed state of the sunroof 22 non-existing - achieve cooling effect.

The sunroof system 2 further comprises a control device 27 , which are used to control the electromotive positioner 24 serves, and in particular realized a sensorless thermal protection. The thermal protection provides, an internal temperature of the electromotive positioner 24 to model and a shutdown or blocking the operation of the electromotive encoder 24 as soon as the modeled temperature reaches or exceeds a limit value or would reach or exceed it in the case of a pending actuation. For this purpose, the control device receives 27 a switching signal that can be specified in particular manually by a driver of the motor vehicle and a request for opening or closing the sunroof 22 equivalent.

Furthermore, the control device receives 27 an information about the forward movement of the motor vehicle in the form of a speed indication. The speed indication can the control device 7 be communicated via a vehicle bus or the like. Optionally, the control device 27 Also, an indication of the ambient temperature, ie the temperature of the ambient air, are provided.

The control device 27 For example, the corresponding information about the speed and the ambient temperature can be communicated via an in-vehicle bus system, for example a LIN bus. Furthermore, the opening position of the sunroof 22 via a corresponding position sensor in the sunroof system 2 or also obtained via the communication bus.

In 2 FIG. 4 is a flow chart illustrating a method of implementing thermal protection in the controller. FIG 27 shown as a flow chart.

At the beginning, ie at the start of the journey, in the control device, a step S1 can take place 27 implemented counter 28 initialized, ie set to a fixed initial value. The counter value represents a temperature of the electromotive positioner 24 according to a known, predetermined relationship. If there is an indication of an ambient temperature, then the initial value can be set according to the given relationship depending on the ambient temperature. In particular, the higher the ambient temperature, the higher the initial value can be chosen.

In step S2, it is checked whether a switching signal indicates that the sunroof 22 by operating the electromotive positioner 24 to be moved to open or close or not. Is indicated by the switching signal that the electromotive encoder 24 is to be operated (alternative: Yes), the method is continued with step S3. Otherwise (alternative: No), the method continues with step S10.

In step S3, the counter value of the counter 28 incremented. The incrementing of the counter value may be at a constant increment or one from a position of the sunroof 22 Dependent increment can be realized to different movement resistance of the sunroof 22 at different positions and the resulting loss of power in the electromotive positioner 24 to consider the heat generated. The increment can be specified position-dependent or as a fixed value as a map.

After the incrementation in step S3, it is checked in step S4 whether the counter value is a predetermined limit value, which is a maximum permissible temperature of the electromotive position indicator 24 represented, reached or exceeded. If this is the case (alternative: yes), then in step S5 the further operation of the electromotive positioner 24 blocked and the process continues with step S10.

The limit value in step S4 can be determined by a calibration in a stationary motor vehicle. This is the electromotive encoder 24 operated at ambient temperature as long as the maximum temperature of the electromotive positioner 24 is reached. It then waits until the electromotive encoder 24 has returned to approximately the ambient temperature. This constant time is now used for the modeling of the cooling curve.

If it is determined in step S4 that the limit value has not been exceeded (alternative: no), the method returns to step S1.

If it is determined in step S2 that the switching signal indicates that the electromotive position indicator 24 is not actively operated (alternative: no), there is no heating due to power loss and it is characterized by a cooling of the electromotive actuator 24 went out. The cooling is performed in step S10 by decrementing the counter 28 (Reduction of counter value) modeled according to a time dependency. Decrementing the counter 28 takes place in time-dependent steps, so that, for example, an exponentially decreasing course of the counter value of the counter 28 is reached. In particular, the decrement may be dependent on a difference between the modeled temperature of the electromotive encoder 24 and the ambient temperature or a specified reference value or only depending on the modeled temperature corresponding counter value.

If a counter value is reached which corresponds to the predetermined initial value or a counter value corresponding to the ambient temperature or to a default value, no further decrementation of the counter value takes place.

In 3 is an example of a course of the modeled temperature of the electromotive encoder 24 presented over time. It can be seen that after an incrementing phase during which the electromotive positioner 24 In operation, and the representative counter value has risen, a reduction of the counter value corresponding to the modeled temperature in a cooling curve is shown.

In a subsequent step S11 is now checked whether the sunroof 22 in an open position. If this is the case (alternative: yes), the method is continued with step S12, otherwise (alternative: no) is returned to step S4.

If it is determined in step S12 that the vehicle speed is within a predetermined speed range (alternative: yes), then the method proceeds to step S13, otherwise (alternative: no) is returned to step S4.

If it is determined in step S13 that the motor vehicle has moved for a predetermined period of time, for example between 1 and 10 minutes, preferably between 3 and 7 minutes, with the vehicle speed within the speed range checked in step S12, and during this time also no reduction of the counter value according to step S14, the process proceeds to step S14, otherwise the process returns to step S4.

In step S14, the counter value is reduced by a predetermined correction amount of the counter value, which is the additional cooling of the electromotive encoder 24 during the predetermined time period at a speed within the speed range. Subsequently, the system jumps back to step S4, wherein this timer, which is required for the time determination in step S13, is reset and a renewed cycle is checked to determine whether an open position of the sliding roof 22 and when traveling at a speed within the speed range for the predetermined period of time, to make it possible to re-reduce the counter value in step S14.

Thus, through the steps S11 to S14, a correction of the modeled by the fixed predetermined cooling curve temperature depending on how the electromotive encoder 24 Surrounded by the airstream of ambient air or flows around.

By this method results in a cooling curve, the in 4 is shown. It can be seen that about 5 minutes after heating by operating the electromotive actuator 24 at 82 ° a reduction by a value of 6 ° (predetermined correction amount of the counter value) takes place, since the motor vehicle is within the predetermined speed range with the sunroof open 22 has moved.

In addition, several different speed ranges can be defined in step S12, to each of which a predetermined time period is assigned in step S13. The reduction of the counter value in step S14 then takes place depending on the relevant speed range and the associated elapsed time duration. The speed range is then associated with respective time periods and correction amounts to reduce the counter value. This can e.g. be specified in a lookup table.

Claims (12)

Method for modeling a temperature of an electromechanical position indicator ( 24 ) for operating a sliding roof ( 22 ) in a sunroof system ( 2 ) of a motor vehicle, comprising the following steps: - providing a counter ( 28 ) with a counter value which determines the temperature of the position indicator ( 24 represents; - with deactivated positioner ( 24 ), Changing the counter value of the counter ( 28 ) according to a predefined cooling curve and depending on a position of the sunroof ( 22 ). Method according to Claim 1, wherein when the positioner is deactivated ( 24 ) the counter ( 28 ) is changed according to a predefined cooling curve and wherein, if an open position of the sunroof ( 22 ) is detected for a certain period of time, the counter value having a correction value which is a predetermined additional cooling of the position indicator ( 24 ) is acted upon. Method according to claim 2, wherein when the positioner is deactivated ( 24 ), the counter ( 28 ) is decremented according to a predefined cooling curve, wherein, if an open position of the sunroof ( 22 ) is detected for a certain period of time, the counter value is reduced with a correction value which determines the predetermined cooling of the position indicator ( 24 ). The method of claim 2 or 3, wherein the amount of the correction value is determined depending on a vehicle speed. The method of claim 4, wherein the amount of the correction value is determined depending on which of one or more speed ranges the vehicle speed is for a specific time period associated with the respective speed range. Method according to claim 4 or 5, wherein the height of the correction value depends on the time duration of an open position after a deactivation of the position indicator ( 24 ) or after a last loading of the counter value with the correction value. Method according to one of claims 1 to 6, wherein the height of the correction value depends on the position of the sunroof ( 22 ) is given. Method according to one of claims 1 to 7, wherein the counter value is initially provided with an initial value which is fixed or dependent on an ambient temperature. Method for operating a sliding roof system ( 2 ), wherein, depending on the counter value ascertained according to the counter value determined according to the method of claims 1 to 8, a blockage or interruption of an activation of the position indicator (FIG. 24 ), in particular depending on the result of a threshold comparison. Device, in particular a control device ( 27 ) for modeling a temperature of an electromechanical position indicator ( 24 ) for operating a sliding roof ( 22 ) in a sunroof system ( 2 ) of a motor vehicle, the device being designed to: - a counter ( 28 ) with a counter value which determines the temperature of the position indicator ( 24 ), and - when the positioner is deactivated ( 24 ) the counter value of the counter ( 24 ) according to a predefined cooling curve and depending on a position of the sunroof ( 22 ) to change. Sunroof system ( 2 ) for a motor vehicle, comprising: - a device according to claim 10, - a sliding roof for opening or grinding a roof opening; - An electromechanical actuator for driving the sunroof. Sunroof system ( 2 ) according to claim 11, wherein the positioner ( 24 ) is arranged so that this in an open position of the sunroof ( 22 ) is umspülbar ambient air or flow around.

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