CN112721596A

CN112721596A - Method for closing or opening an opening arranged in a motor vehicle by means of a cover and electric drive unit for carrying out the method

Info

Publication number: CN112721596A
Application number: CN202011162591.4A
Authority: CN
Inventors: C·D·克莱默; D·尼瑟尔; R·伯格
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2019-10-28
Filing date: 2020-10-27
Publication date: 2021-04-30
Also published as: DE102019216537A1

Abstract

The invention relates to a method for closing or opening an opening (20) arranged in a motor vehicle by means of a motor-adjustable cover (24), in particular a window pane (23) or a sliding sunroof, and to an electric drive unit (10) for carrying out the method, wherein a MEMS sensor (18) arranged on the circuit board (14) detects booming noise generated by air vibrations on the partially open opening (20) during driving of the motor vehicle, and the MEMS sensor (18) transmits the growl signal (40) to the control electronics (12), the control electronics is associated with a control unit (11) for a movable component (23) in the motor vehicle, wherein the regulating unit (11) is actuated on the basis of the detected growl signal (40), in order to reduce or suppress the rolling noise by means of the adjusting of the movable part (23).

Description

Method for closing or opening an opening arranged in a motor vehicle by means of a cover and electric drive unit for carrying out the method

Technical Field

The invention relates to a method for closing or opening an opening arranged in a motor vehicle by means of a motor-adjustable cover, in particular a window pane or a sliding sunroof, and to an electric drive unit for carrying out the method, of the type according to the independent claims.

Background

JP 61169319 a1 discloses a method for operating a sliding roof, wherein the wind noise on the sliding roof is measured by means of a microphone. The microphone is disposed in an interior space of the vehicle and provides a signal to a motor that adjusts the baffle to reduce wind noise.

EP 0834219B 1 describes a device for monitoring a sliding roof drive, in which an air pressure sensor supplies an air pressure signal to a control unit in order to correct a limit value for a closing force limit for the sliding roof.

In these methods, the sensing system is relatively cumbersome or not suitable for directly suppressing the boom state at the opening (Wummer-Zustand).

Disclosure of Invention

The method according to the invention for closing or opening an opening arranged in a motor vehicle by means of a motor-adjustable cover and the electric drive unit (10) for carrying out the method, which have the features of the independent claims, have the advantage over this that the booming noise can be detected very reliably and in particular without great additional effort by using a MEMS sensor. The MEMS sensor may be arranged and interconnected on a circuit board along with other electronic components. The MEMS sensor and the corresponding evaluation unit can thus advantageously be arranged on the same circuit board, so that additional wiring complexity is eliminated. In this case, the MEMS sensor provides raw data or processed signals, which are used to detect whether a growl state is present. If a growl state is detected, a control unit can be actuated accordingly, which controls a moving component in the motor vehicle in such a way that the unpleasant growl noise generated by a stationary axle in the vehicle disappears.

Advantageous refinements and embodiments of the invention are possible by means of the measures cited in the dependent claims. In a preferred embodiment, therefore, the MEMS sensor detects structure-borne sound of a circuit board on which the MEMS sensor is fastened. Such structure-borne sound is excited by airborne vibrations of the booming noise propagating from the vehicle opening in the interior space of the vehicle. The MEMS sensor can sense the structure-borne sound signal very sensitively, since the MEMS sensor is mechanically fixedly coupled to the circuit board. The structure-borne sound signal measured by the MEMS sensor contains a large depth of information, so that the structure-borne sound signal can be evaluated very precisely and reliably in order to unambiguously detect the presence of a state of booming. In a variant, the MEMS sensor can be arranged on a flexible printed circuit board (flexible PCB), whereby the position of the MEMS sensor can be designed to be more variable, for example within the electric drive unit.

In another embodiment, the MEMS sensor directly measures the air pressure observed by the MEMS sensor. The air vibrations of this booming noise propagate throughout the interior of the vehicle and thus also within the control unit or the electric drive unit. The air pressure or the fluctuations in the air pressure in the region of the circuit board in which the MEMS sensor is fastened is therefore likewise a measure for the presence of a rolling state. Such MEMS air pressure sensors can likewise be arranged on a circuit board with very small design.

The raw data acquired by the MEMS sensor are either processed directly in the MEMS sensor or are fed to a separately implemented evaluation unit for further processing. In particular, it is advantageous to use a microprocessor, which is already arranged on the circuit board of the control unit for further functions, for evaluating the boom signal. The MEMS sensor is connected directly to the microprocessor via a printed circuit board, so that the anti-rolling function does not involve additional hardware expenditure, apart from the additional MEMS sensor being mounted on the circuit board.

In order to terminate the rolling state, the cover of the opening is moved in a simple manner for such a long time that no disturbing standing waves are formed. This is preferably achieved by a control loop in which the boom signal is continuously evaluated as to whether a boom state is still present. Once the rolling state has disappeared, the cover can be held in the new position and the regulating unit can be switched off. In such a device, it is particularly advantageous if the MEMS sensor is arranged on a circuit board of the control electronics of the actuating unit. The evaluation unit of the rolling signal can directly control the power electronics of the electric motor, which adjusts, in particular moves, the adjustable cover in the opening.

In an alternative embodiment, in order to stop the rolling state, a motor-operated deflector is adjusted, which is preferably arranged on the sliding roof opening. The air flow can thus advantageously be changed by tilting or displacing the movable baffle, while the size of the sliding roof opening remains unchanged, in such a way that the rolling state no longer occurs at the opening. Such a motor-driven air deflector can also be arranged, for example, on a lateral window opening.

In another embodiment, a cover of another opening in the motor vehicle is actuated based on the detected booming signal of the MEMS sensor. This may be, for example, a further side window, or a sliding roof or ventilation flap, which can be actuated by a further actuator. If the MEMS sensor identifies a growl condition, pressure equalization is achieved by opening another opening in the vehicle such that the standing wave of the growl condition disappears. In this case, the controllers of the different servo drives are electrically connected to one another, so that the evaluation unit of the MEMS sensor can directly send control signals to the other servo drive.

In the evaluation unit, the detected boom signal (in particular, the structure-borne sound signal) of the MEMS sensor is compared with a stored boundary value which represents the boom state. As soon as the limit value is reached, a rolling state is detected and the control unit for controlling the movable component is activated accordingly. In this case, the movable part is set for so long a time that the rolling state ceases.

In a preferred embodiment, the MEMS signal is also fed to a clamping protection function of the drive unit, which regulates the cover in the relevant opening. Since high forces act on the component to be adjusted when the rolling state occurs, the MEMS signal serves to reduce the sensitivity of the pinch protection function in the rolling state in order to prevent possible false triggering. Thus, for example, a reverse rotation (Reversieren) of the actuating drive is prevented, so that the opening can be reliably closed when no actual clamping situation exists.

Furthermore, MEMS sensors measuring structure-borne noise can also evaluate other information of the drive unit. For example, the motor speed of the drive unit can be detected from the structure-borne sound signal and used for position detection thereof. Furthermore, the MEMS sensor can also detect the acceleration of the vehicle in the vertical direction very reliably, so that, for example, the pinch protection function can be corrected or optimized on bad roads. By evaluating the structure-borne noise signals of such MEMS sensors, an additional rotational speed sensing system of the electric motor can be dispensed with.

In order to more reliably detect whether a growl state is present, the evaluation unit can process a speed signal of the vehicle, which characterizes a further influence on the growl state. Furthermore, vehicle-specific data can be stored, which data for example characterizes the type or form of the opening. In this way, a possible rolling state can be detected more reliably.

If the MEMS sensor measures a structure-borne sound signal, a very large amount of information can be advantageously obtained from the structure-borne sound signal, which can be used to detect a state of boom. For example, a spectral analysis of the structure-borne sound signal can be carried out and compared with a stored spectral analysis which is representative of the state of booming of the relevant opening. In this case, the comparison of the spectral analysis can be based, for example, on a narrower tolerance band for the frequency of the particular disturbance than in the case of other frequencies in which the driver feels less disturbance. Thus, the evaluation of the spectral analysis of the MEMS signal offers many possibilities for optimizing the growl state recognition.

The method according to the invention can be used particularly advantageously for the electric motor-driven actuation of window panes and sliding roofs in motor vehicles. In this case, the MEMS sensor can be arranged particularly cost-effectively directly on the control electronics of the electric drive unit for the component to be regulated. The boom state detection is thus completely integrated within the electric drive unit and therefore requires no additional effort during assembly. In this case, the MEMS sensor is arranged on a circuit board of the control unit, so that additional control lines between the MEMS sensor and the evaluation unit and/or the power electronics for the electric motor are eliminated.

Optionally, the evaluation unit can also be integrated into the MEMS sensor here, or the MEMS sensor can be an integrated component of the ASICS and/or of the microprocessor.

In the case of a servo drive with integrated electronics and/or with plug-in electronics, the detection of the rolling state can be carried out without additional sensor lines. It is also conceivable to arrange the evaluation unit in a central control unit, in particular for a plurality of electric motors at the same time, in order to be able to evaluate different MEMS signals of different openings. The use of MEMS sensors (micro-electromechanical systems) is particularly cost-effective and compact. Such MEMS sensors can sense solid-state acoustic vibrations in all spatial directions, where the solid-state acoustic excitation does not have a preferred direction. The MEMS sensor can be integrated into an ASIC module or arranged directly on the circuit board as a separate sensor element, for example by means of SMD technology. Since mechanical vibrations are measured in this case, the measuring principle is not susceptible to electromagnetic interference radiation. Such structure-borne sound signals of the MEMS sensor are therefore very robust with respect to manufacturing tolerances and with respect to component wear.

Drawings

The invention is explained in more detail below by means of examples, without the invention being restricted thereto. In which is shown:

fig. 1 shows a schematic illustration of a method according to the invention for closing or opening an opening arranged in a motor vehicle, and

fig. 2 shows a device according to the invention with a window lifter drive as an electric drive unit.

Detailed Description

Fig. 1 schematically shows a method for closing or opening an opening 20 arranged in a motor vehicle. The MEMS sensor 18 detects disturbing boom noises which may occur in the interior space during driving through an opening 20 of the motor vehicle. The MEMS sensor 18 transmits a so-called growl signal 40 to the evaluation unit 17, which can determine whether a disturbed growl state is present. For this purpose, for example, the boom signal 40 is compared with a limit value stored in the memory 36, which is preferably determined empirically beforehand. In addition, a speed signal 42 of the motor vehicle can be supplied to the evaluation unit 17 by means of a speed sensor 43, since the rolling noise is also usually dependent on the vehicle speed. If the evaluation unit 17 identifies that a growl state is present, it initiates the actuation of the regulating device 11, which regulates the moving components in the motor vehicle in order to end the growl state. For this purpose, for example, the control electronics 12 can actuate an electric drive unit 30 which changes the position of the cover 24 of the opening 20 in order to influence the booming noise. Alternatively or additionally, the evaluation unit 17 can cause a further actuating unit 50 to be actuated, which actuates, for example, preferably opens, a further opening in the motor vehicle. This may preferably be a further window, a sliding roof or a ventilation flap. Furthermore, the evaluation unit 17 can also cause a motor-driven adjustment of the air deflector 51, which changes the air flow at the opening 20 in such a way that the rolling state disappears. In a further variant, the growl signal 40 or a signal 44 derived therefrom is transmitted to the pinch protection function 34 for the opening 20 in order to improve the reliability of the pinch protection function, the sensitivity of which can be reduced, for example, on the basis of the detected growl state in order to prevent false triggering and thus opening of the opening.

Preferably, the MEMS sensor 18 is disposed on the electronic circuit board 14 and detects solid acoustic vibrations excited by air vibrations at an opening 20 in the circuit board 14. The detected structure-borne sound signal 46 is then processed in the evaluation unit 17 and a spectral analysis 47 of the structure-borne sound signal 30 is generated. The measured spectral analysis 47 is compared with a predetermined boundary value spectral analysis which indicates the occurrence of the rolling state. For this purpose, the limit value can be stored in the memory 36. Therefore, the presence of the rolling state can be recognized, and for example, the rolling state can be displayed on a display unit in the automobile. The control electronics 12 are informed that a growl state is present, which then actuates the regulating unit 11 in order to suppress the growl noise.

Fig. 2 shows an embodiment of an apparatus 10 for carrying out the method according to the invention. The opening 20 is in this case designed as a window with a frame 15, which can be closed and opened by means of a cover 24 designed as a window pane 23. Preferably, the cover portion 24 moves along the vertical direction 21. The cover 24 is actuated by an adjusting device 11, which is designed as an electric drive unit 30, in particular as a window lifter adjusting device. The drive unit 30 has an electric motor 15 which transmits a drive torque to the cover 24 via the mechanism 13. The mechanism 13 can be configured, for example, as a rope drum or a shear link driven via a driven pinion of the drive unit 30. The driven pinion can be connected to the rotor shaft of the electric motor by a worm gear or an eccentric gear.

The drive unit 30 has control electronics 12, which operate the electric motor 15. The operating element 16 can be actuated by the occupant in order to initiate an adjustment of the cover 24. In the control electronics 12, a MEMS sensor 18 is arranged, which detects solid-state acoustic vibrations of the drive unit 30 excited by air vibrations in the interior of the vehicle. During driving, standing waves are formed at a specific speed and in the open state of the cover 24, which standing waves produce unpleasant rolling noise. The MEMS sensor 18 detects the solid acoustic vibrations and generates a boom signal 40, which it transmits to the evaluation unit 17. In this embodiment, the MEMS sensor and evaluation unit 17 is preferably arranged on the electronic circuit board 14 of the control electronics 12. The MEMS sensor 18 and/or the evaluation unit 17 can be part of an ASICS or a microprocessor 19, which is arranged on the circuit board 14. Alternatively, the MEMS sensor 18 is connected directly via a conductor track to the evaluation unit 17 and/or the microprocessor 19. In a further embodiment, the evaluation unit 17 can also be arranged in a separate control unit 12, which can for example control a plurality of electrical control units 11 or be arranged in a vehicle computer. When the evaluation unit 17 identifies a growl state, the controller 12 receives an instruction to operate the regulator plug unit 11 so as to end the growl state. In this embodiment, the electric drive unit 30, in particular the electric drive unit 30 of the window lifter, is energized as the adjustment unit 11 in order to adjust the cover 24 and thereby to vary the air vibration at the opening 20. Alternatively, however, a further cover or air flap 50 of a further opening can also be actuated as the regulating unit 11 in order to establish a pressure equalization which ends the rolling state. In particular, when the cover is designed as a sliding roof, the control unit 12 can also actuate a motor-driven air deflector 51, which influences the air flow depending on the opening state of the sliding roof, so that the booming noise disappears.

It is to be noted that, with regard to the exemplary embodiments shown in the figures and in the description, various possible combinations of the individual features with one another are possible. Thus, for example, electric motor 12 may be designed as a DC or DC motor and combined with different transmission configurations. Likewise, the control unit 12 may be an integrated component of the control unit 11 or be designed as a central control unit 12 for a plurality of electric drive units 30. The MEMS sensor 18 is arranged on a circuit board 14, which is preferably configured as an electronic circuit board (PCB) 14 of the drive unit 30. However, the MEMS sensor 18 can also be fastened to other component carriers (stamped grid, 3D-MID) or directly to any desired position of the electric drive unit 30 without the printed circuit board 14. The method according to the invention can be used on the one hand for actuating window lifters and sliding roofs, but on the other hand also for controlling the noise of fans or pumps, for example. The method can also be used for applications outside of motor vehicles.

Claims

1. Method for closing or opening an opening (20) arranged in a motor vehicle by means of a motor-adjustable covering (24), in particular a window pane (23) or a sliding sunroof lid,

wherein a MEMS sensor (18) arranged on the circuit board (14) detects boom noise generated by air vibrations on the opening (20), in particular partially open, during driving of the motor vehicle, and the MEMS sensor (18) transmits a boom signal (40) to control electronics (12) which are associated with a control unit (11) for a movable component (23) in the motor vehicle, wherein the control unit (11) is actuated on the basis of the detected boom signal (40) in order to reduce or suppress the boom noise by means of the adjustment of the movable component (23).

2. Method according to claim 1, characterized in that the MEMS sensor (18) detects structure-borne sound transmitted by the booming noise onto the circuit board (14), wherein in particular the circuit board (14) is configured as an electronic circuit board (PBC) or a flexible PCB or a 3D MID or a stamped grid.

3. Method according to claim 1, characterized in that the MEMS sensor (18) detects air pressure, in particular air pressure fluctuations, which propagate within the interior space of the motor vehicle by means of booming noise.

4. The method according to one of the preceding claims, characterized in that the data of the boom signal (40) measured by the MEMS sensor (18) are processed in an evaluation unit (17) which is integrated in the MEMS sensor (18) or arranged in the control electronics (12), wherein in particular the evaluation unit (17) is designed as a microprocessor (19).

5. Method according to any one of the preceding claims, characterized in that the adjusting unit (11) is configured as a drive unit (30) for an adjustable cover portion (24) and the control electronics (12) operate the drive unit (30) on the basis of the detected growl signal (40) in order to reduce or suppress the growl noise by changing the size of the opening (20).

6. Method according to any of the preceding claims, characterized in that the regulating unit (11) is configured as a movable deflector (51) and the control electronics (12) operate the movable deflector (51) on the basis of the detected booming signal (40) in order thereby to reduce or suppress the booming noise.

7. Method according to one of the preceding claims, characterized in that the regulating unit (11) is configured as a servo drive (50) of a further covering or of a ventilation flap in the motor vehicle, and the control electronics (12) actuate the servo drive of the further covering or of the ventilation flap on the basis of the detected booming signal (40) in order to thereby reduce or suppress the booming noise.

8. Method according to any one of the preceding claims, characterized in that the growl signal (40) is compared with a stored boundary value and, when the boundary value is exceeded or undershot, a growl state is identified and in particular displayed, on the basis of which the regulating unit (11) is actuated in order to reduce or suppress the growl noise.

9. Method according to any one of the preceding claims, characterized in that the MEMS signal (40) is used for a clamping protection function (34) of the drive unit (30) for the adjustable cover (24) in order to suppress false triggering thereof when a rolling state occurs.

10. Method according to one of the preceding claims, characterized in that the MEMS sensor (18) additionally determines the motor speed of the drive unit (30) from a structure-borne sound signal and/or detects the acceleration of the vehicle, in particular in the vertical direction (21), and feeds it to the control electronics (12) in order to optimize the actuation of the drive unit (30), preferably for its grip protection function (34).

11. Method according to any one of the preceding claims, characterized in that a speed signal (42) of the motor vehicle is fed to the evaluation unit (17), which is taken into account for identifying the grower state.

12. Method according to any one of the preceding claims, characterized in that a spectral analysis of the solid-borne sound signal of the MEMS sensor (18) is generated and, on the basis of an evaluation of the spectral analysis, in particular a comparison thereof with a stored threshold spectrum, the presence or absence of a growl state is identified.

13. Device (10) for closing or opening an opening (20) arranged in a motor vehicle by means of a motor-adjustable covering (24), in particular a window pane (23) or a sliding sunroof lid, for carrying out a method according to one of the preceding claims, having control electronics (12) and a drive unit (30) for motor-adjusting the covering (24), wherein a MEMS sensor (18) for detecting booming noise is arranged on a circuit board (14).

14. Device, in particular electric drive unit (10), according to claim 13, characterized in that the circuit board (14) is an integral part of a control electronics (12) which controls an electric motor (15) of the drive unit (30), wherein the MEMS sensor (18) and an evaluation unit (17) of the boom signal (40) are arranged on the same circuit board (14).