Wiper system for vehicle window panel
Through the cooperation of the calculation unit and the position sensor, the precise position adjustment of the wiper system during the assembly process is achieved, the problem of output shaft deviation is solved, and the assembly accuracy and response speed are improved.
Patent Information
- Application Number
- CN202411400801.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-10-12
- Filing Date
- 2024-10-09
- Publication Date
- 2025-04-15
AI Technical Summary
During the assembly process, existing wiper systems are prone to deviating from the target position due to the increase in friction ratio, resulting in assembly deviation and position deviation of the parking position.
The calculation unit is used to perform continuous position adjustment, and the rotor position is detected through the position sensor of the electric motor, which can achieve accurate position adjustment with high angle resolution and avoid limiting the capture range.
Direct position adjustment of the drive unit without a capture range is achieved, avoiding wiper arm adjustment, and improving assembly accuracy and response speed.
Smart Images
Figure CN119821326A_ABST
Abstract
Description
Background Art
[0001] A wiper system for a vehicle windshield has been proposed, comprising: at least one wiper arm; at least one drive unit, in particular a reversible drive unit, which is provided for directly driving the wiper arm; and at least one computing unit which is provided for position control of the drive unit. Summary of the invention
[0002] The invention relates to a wiper system for a vehicle window, in particular a vehicle front window, the wiper system comprising: at least one wiper arm; at least one drive unit, in particular a reversible drive unit, which is configured to directly drive the wiper arm; and at least one calculation unit, which is configured to perform position regulation on the drive unit.
[0003] It is proposed that the computing unit is provided at least in the assembled operating state for continuous position control of the drive unit. Preferably, at least the wiper arm is mounted on the drive unit in the assembled operating state. The wiper arm is connected to the output shaft of the drive unit in particular via a conical press connection. However, other connections that appear meaningful to a person skilled in the art are also conceivable.
[0004] The wiper system preferably comprises at least one wiper arm, optionally a plurality, in particular two wiper arms. The wiper arm is preferably provided for arranging a wiper blade of the wiper system in a manner, in particular pivotable, relative to the surface to be cleaned. The wiper blade is particularly preferably a windshield wiper, in particular a vehicle windshield wiper. The surface to be cleaned and the wiper system are particularly preferably part of a vehicle, in particular a motor vehicle, such as a passenger car, a truck, a tractor, a bus, etc., a rail vehicle, a water vehicle, an aircraft, etc. Optionally, the wiper system comprises at least one transmission element, in particular a reversible wiper lever, which is provided for transmitting a rotational movement or a pivoting movement caused by a drive unit to at least one wiper arm.
[0005] The drive unit is formed in particular by a reversible drive unit. The drive unit is formed in particular by a wiper drive unit. The drive unit preferably comprises a motor, in particular an electric motor, for driving a wiper arm. The motor is preferably configured as a reversible motor, in particular when the wiper arm is driven directly, and alternatively as a rotary device, in particular when the wiper arm is driven indirectly by a transmission element. The motor comprises in particular a stator, a rotor and a drive shaft coupled to the rotor. The drive unit preferably further comprises a transmission. The transmission is arranged in particular between a drive shaft and an output shaft of the drive unit along a torque flow. The drive unit preferably comprises at least one housing, in which the motor and the transmission are arranged. The housing comprises in particular a transmission housing and a motor component housing. A "drive shaft" should be understood in particular as a part of a drive unit, in particular a motor and preferably an electric motor drive, which provides at least one rotational movement for at least one other unit, in particular in at least one operating state. It is further preferably provided that the drive unit has at least one rotational direction reversal, which is responsible for the reversal of the direction of movement, in particular at the end position of the wiper arm, respectively.
[0006] A "computing unit" should be understood in particular as a unit having an information input, an information processing unit and an information output unit. Advantageously, the computing unit has at least one processor, a memory, an input device and an output device, other electrical components, an operating program, a regulation routine, a control routine and / or a calculation routine. Preferably, the components of the computing unit are arranged on a common circuit board and / or advantageously arranged in a common housing. In this respect, "continuous position adjustment" should be understood in particular as a permanent position adjustment, wherein the rotational position of the drive unit, in particular the output shaft, is permanently adjusted to a predetermined value. Preferably, the position correction is performed directly during detection, that is, in particular within the framework of the angular resolution of the sensor device of the computing unit and / or the drive unit. Preferably, the angular resolution is at least 0.5°, preferably at least 0.1° and particularly preferably at least 0.05°. In addition, it is also conceivable that the angle detection is performed continuously. The position adjustment is in particular without a capture range. Therefore, the position adjustment is performed in particular directly without a capture range.
[0007] The design of the wiper system according to the invention makes it possible to achieve direct position control, in particular without a catch range. During the assembly of the wiper arm, it may happen that the output shaft of the drive deviates from the target position due to the increased friction ratio. In current wiper systems, there is a catch range of + / -1° in particular. Only after this catch range is a twist detected and resisted. This can lead to assembly deviations of up to 1°. This results in large position deviations in the parking position. The design of the wiper system according to the invention makes it possible to avoid adjustments to the wiper arm.
[0008] In addition, it is proposed that the drive unit has at least one electric motor, which has a rotor and a position sensor for the rotor. The position sensor is formed in particular by a motor-integrated position sensor device of the rotor. The position sensor is formed in particular by a sensor unit. Alternatively, it is also conceivable to integrate the position sensor in the electronic device of the electric motor. "Sensor unit" should be understood in this regard as a unit that is configured to record at least one characteristic variable and / or physical property, wherein the recording can be performed actively, such as in particular by generating and sending an electrical measurement signal and / or passively, such as in particular by detecting a characteristic change of a sensor component. Different sensor units that are meaningful to a person skilled in the art can be conceived. In this way, the position of the drive shaft and the output shaft of the drive unit can be detected reliably, in particular advantageously. In turn, an advantageously fast response time for continuous position regulation can be achieved. In addition, an advantageously high angular resolution can be achieved in particular by detecting the position at the rotor.
[0009] It is further proposed that the computing unit is provided, at least in the installed operating state, for continuous position control of the drive unit as a function of a position sensor of the rotor of the electric motor. This makes it possible in particular to achieve an advantageously precise position control. This in turn makes it possible to achieve an advantageously fast response time for the continuous position control. Furthermore, by detecting the position at the rotor, an advantageously high angular resolution can be achieved in particular.
[0010] It is further proposed that the electric motor is formed by an EC motor, in particular a brushless DC motor. The electric motor is in particular formed by a brushless DC motor. The electric motor is in particular formed by an electrically commutated motor. The electric motor is preferably designed as a synchronous motor, in particular as a three-phase synchronous motor, wherein the excitation is carried out by permanent magnets. The electric motor has in particular at least one stator and at least one rotor running synchronously with the stator. In particular, advantageous position regulation can be achieved by EC technology, in particular if a position sensor is used for the rotor instead of a position sensor at the output shaft. This makes it possible to detect significantly faster position changes.
[0011] In addition, it is proposed that the drive unit has at least one output shaft, which is provided for connection with a wiper arm, and the drive unit has at least one transmission mechanism, which is arranged between the electric motor of the drive unit and the output shaft. The output shaft in particular forms a wiper bearing. "Wiper bearing" should be understood in particular as a support for at least one wiper arm. In particular, the wiper bearing is provided for rotation around an axis. In addition, the transmission mechanism is in particular formed by a worm gear mechanism. The worm gear mechanism is in particular a combination of a screw gear mechanism and a gear gear mechanism, and is formed by a spiral worm shaft and a gear, i.e. a worm wheel. The helix of the worm shaft is embedded in the tooth gap of the worm wheel. The worm shaft of the transmission mechanism is in particular connected to the drive shaft in a rotationally fixed manner. The gear is in particular connected to the output shaft in a rotationally fixed manner. This can in particular provide an advantageous transmission ratio, in particular a reduction ratio, between the motor and the wiper bearing.
[0012] It is further proposed that the transmission has a transmission ratio of at least 50:1, in particular the drive speed to the output speed. Preferably, the transmission has a transmission ratio of at least 60:1, preferably at least 70:1, in particular the drive speed to the output speed. Preferably, the transmission has a transmission ratio of 76:1, in particular by way of example. This makes it possible to provide an advantageous transmission ratio, in particular a reduction ratio, in particular between the motor and the wiper bearing. The high transmission ratio makes it possible to detect position changes at the rotor of the electric motor quickly and precisely, in particular advantageously.
[0013] Furthermore, the invention is based on a vehicle having a windshield wiper system.
[0014] Furthermore, the present invention is based on a method for assembling a wiper system. It is proposed that, in at least one assembly step, a wiper arm of the wiper system is assembled on an output shaft of a drive unit of the wiper system, wherein a position adjustment of the drive unit is performed permanently, in particular without a capture range, by means of a computing unit. In the assembly step, the wiper arm is placed on the output shaft of the drive unit, in particular by means of a shaft receptacle. The output shaft has, in particular, a conical region for realizing a conical press connection. Preferably, the output shaft also has an external thread, which is provided for receiving a nut for fixing the wiper arm. During the position adjustment, the rotational position of the drive unit, in particular the output shaft, is permanently adjusted to a predetermined value. By means of the method according to the present invention, direct position adjustment can be realized during assembly, in particular without a capture range. It can be avoided in particular that, during the assembly of the wiper arm, the output shaft of the drive deviates from the target position, in particular due to an increased friction ratio.
[0015] The wiper system according to the invention and the method are not intended to be limited to the applications and embodiments described above. In particular, the wiper system according to the invention and the method can have a number of individual elements, components and units and method steps that differ from the number mentioned here in order to fulfill the functional mode described here. In addition, with regard to the range of values specified in the present disclosure, the values within the mentioned boundaries are also to be regarded as public and can be used arbitrarily. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Further advantages are obtained from the following description of the drawings. Embodiments of the invention are shown in the drawings. The drawings, the description and the claims contain a large number of combined features. A person skilled in the art will also consider these features individually in an appropriate manner and combine them into meaningful further combinations.
[0017] in:
[0018] Figure 1 The schematic diagram shows a wiper system according to the invention, which has a drive unit and a wiper arm, and
[0019] Figure 2 A schematic flow chart for assembling a windshield wiper system according to the invention is shown. DETAILED DESCRIPTION
[0020] Figure 1 The wiper system 10 is shown. The wiper system 10 is used for a vehicle windshield. The wiper system 10 is used for a vehicle windshield. The vehicle windshield and the wiper system 10 are part of a vehicle, in particular a motor vehicle, for example a passenger car.
[0021] The wiper system 10 has a wiper arm 12. The wiper arm 12 is provided for arranging a wiper blade (not further visible) of the wiper system 10 relative to a vehicle window, in particular pivotably. The wiper blade is a windshield wiper. The wiper arm 12 has a fastening element 28. The fastening element 28 has two wiper arm sections 30, 32 and a hinge 34. The wiper arm sections 30, 32 are connected via the hinge 34. In addition, a spring element (not further visible) is arranged in the region of the hinge 34. The spring element (not further visible) is provided for pressing the second wiper arm section 32 in the direction of the vehicle window in the pressing region of the second wiper arm section 32. The first wiper arm section 30 is connected to the drive unit 14. The drive unit 14 is connected to the wiper arm 12 via an output shaft 22. The output shaft 22 is connected to the fastening element 28 at the outer end of the wiper arm 12, viewed along the main extension direction of the wiper arm 12. A wiper arm adapter is arranged, not further visible, at the end of the second wiper arm section 32 facing away from the hinge 34. The wiper arm adapter is provided for receiving a wiper blade adapter of a wiper blade. The wiper arm adapter receives the wiper blade adapter.
[0022] Furthermore, the wiper system 10 has a drive unit 14. The drive unit 14 is formed by a reversible drive unit. The drive unit 14 is provided for directly driving the wiper arm 12. The drive unit 14 has an electric motor 18, which has a rotor and a position sensor 20 for the rotor. The electric motor 18 comprises a stator, a rotor and a drive shaft coupled to the rotor. The position sensor 20 is formed by a motor-integrated position sensor of the rotor. The electric motor 18 is formed by an EC motor. The electric motor 18 is formed by a brushless DC motor. The electric motor 18 is formed by a brushless DC motor. The electric motor 18 is formed by an electrically commutated motor. The electric motor 18 is preferably configured as a synchronous motor, in particular as a three-phase synchronous motor, wherein excitation is performed by permanent magnets. The rotor of the electric motor 18 runs synchronously with the stator.
[0023] The drive unit 14 further comprises an output shaft 22, which is provided for direct connection with the wiper arm 12. The output shaft 22 in particular forms a wiper bearing. The output shaft 22 has a conical region for realizing a conical press connection with the wiper arm 12. The output shaft 22 further comprises an external thread, which is provided for receiving a nut 36 for fixing the wiper arm 12. The wiper arm 12 is pressed onto the conical region of the output shaft 22 in particular by means of a nut 36 with an inner cone.
[0024] In addition, the drive unit 14 has a transmission mechanism 24, which is arranged between the electric motor 18 of the drive unit 14 and the output shaft 22. The transmission mechanism 24 is formed by a worm gear mechanism. The worm gear mechanism is a combination of a screw gear mechanism and a gear gear mechanism, and is composed of a spiral worm shaft and a gear, i.e. a worm wheel. The thread of the worm shaft is embedded in the tooth gap of the worm wheel. The worm shaft of the transmission mechanism 24 is connected to the drive shaft of the electric motor 18 in a rotationally fixed manner. The gear of the transmission mechanism 24 is connected to the output shaft 22 in a rotationally fixed manner. The transmission mechanism 24 has a transmission ratio of at least 50:1, in particular, of the drive speed relative to the output speed. Preferably, the transmission mechanism 24 has a transmission ratio of at least 60:1, preferably at least 70:1, of the drive speed relative to the output speed. The transmission mechanism 24 has a transmission ratio of 76:1 as an example.
[0025] Furthermore, the drive unit 14 comprises a housing 37 in which the electric motor 18 and the gear mechanism 24 are arranged. The housing 37 comprises, by way of example, a gear mechanism housing 38 and a motor part housing 40 .
[0026] The wiper system 10 further comprises a computing unit 16 which is provided for position control of the drive unit 14 and which can also be integrated as an electronic control unit (ECU) in the transmission housing 38. The computing unit 16 is provided in the installed operating state for continuous position control of the drive unit 14, wherein the rotational position of the drive unit 14, in particular the output shaft 22, is permanently adjusted to a predetermined value. Preferably, the position correction is performed directly during the detection. The computing unit 16 is provided at least in the installed operating state for continuous position control of the drive unit 14 as a function of a position sensor 20 of the rotor of the electric motor 18.
[0027] Figure 2 A schematic flow chart of a method for assembling a wiper system 10 is shown. In the method, in an assembly step 26, a wiper arm 12 of the wiper system 10 is assembled on the output shaft 22 of the drive unit 14 of the wiper system 10. In the assembly step 26, the wiper arm 12 is placed on the output shaft 22 of the drive unit 14 by means of a shaft receptacle and is fixed and clamped by means of a nut 36. During the assembly step 26, a position adjustment of the drive unit 14 is performed permanently and without a capture range by means of a computing unit 16. During the position adjustment, the rotational position of the drive unit 14, in particular the output shaft 22, is permanently adjusted to a predetermined value. For this purpose, in a substep 42, the rotational position of the drive unit 14 is permanently monitored by means of a position sensor 20. If the actual rotational position corresponds to the target rotational position, the substep 42 is permanently repeated. If the actual rotational position does not correspond to the target rotational position, a correction step 44 is carried out in which the rotational position of the drive unit 14 is adapted to the target rotational position. The rotational position is adapted by actuating the electric motor 18. During assembly, for example, assembly forces which would twist the output shaft 22 can then be directly resisted. The assembly step 26 or the sub-step 42 can then be repeated permanently.
Claims
1. A wiper system for a vehicle window, in particular a vehicle front window, comprising: at least one wiper arm (12); at least one drive unit (14), in particular a reversible drive unit, which is provided for directly driving the wiper arm (12); and at least one computing unit (16) configured to control the position of the drive unit (14), It is characterized in that The computing unit (16) is provided, at least in an assembled operating state, for the purpose of continuously regulating the position of the drive unit (14).
2. The wiper system according to claim 1, characterized in that: The drive unit (14) has at least one electric motor (18) having a rotor and a position sensor (20) for the rotor.
3. The wiper system according to claim 2, characterized in that: The computing unit (16) is provided, at least in an installed operating state, for continuously regulating the position of the drive unit (14) as a function of a position sensor (20) of a rotor of the electric motor (18).
4. A wiper system at least according to claim 2, characterized in that The electric motor (18) is formed by an EC motor, in particular a brushless DC motor.
5. A wiper system according to any one of the preceding claims, characterized in that The drive unit (14) has at least one output shaft (22) which is provided for connection with the wiper arm (12) and at least one transmission mechanism (24) which is arranged between an electric motor (18) of the drive unit (14) and the output shaft (22).
6. The wiper system according to claim 5, characterized in that: The transmission (24) has a transmission ratio, in particular of drive speed to output speed, of at least 50:
1.
7. Vehicle having at least one windshield wiper system (10) according to any one of the preceding claims.
8. Method for assembling a windshield wiper system (10) according to any one of claims 1 to 6.
9. The method according to claim 8, characterized in that In at least one assembly step (26), a wiper arm (12) of the wiper system (10) is mounted on an output shaft (22) of a drive unit (14) of the wiper system (10), wherein a position adjustment of the drive unit (14) is performed permanently, in particular without a capture range, by means of the computing unit (16).