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DE-102016012267-B4 - Drive device for a vehicle interior fitting, adjustment device and headrest

DE102016012267B4DE 102016012267 B4DE102016012267 B4DE 102016012267B4DE-102016012267-B4

Abstract

Drive device (10) for a vehicle interior equipment component (13) comprising an adjustment motor (16) and a control unit (17), wherein the adjustment motor (16) is controlled by means of the control unit (17), wherein a sensor is assigned to the drive device (10) with the adjustment motor (16) and a transmission (36), wherein a pulse rate modifier (18) is interposed between the adjustment motor (16) and the control unit (17), which modifies a pulse rate (P Motor ) received from the adjustment motor (16) such that it lies within a pulse rate value range (P Control Unit Max ) to be processed by the control unit (17), and wherein the pulse rate modifier (18) forwards a modified pulse rate value (P Reduce ) to the control unit (17), characterized in that the pulse rate modifier (18) comprises a mechanical transmission (36), according to which the rotational speed of the The adjustment motor (16) can be modified such that it lies within a pulse rate range to be processed by the control unit (17), wherein a sensor is assigned to a gear stage of the transmission (36) which measures the speed (n transmission ) of the gear stage which is in a certain gear ratio to the speed (n motor ) of the adjustment motor (16) and sends a correlating pulse rate to the control unit (17).

Inventors

  • Maximilian KOTZ
  • Manuel Bösl

Assignees

  • GRAMMER AKTIENGESELLSCHAFT

Dates

Publication Date
20260513
Application Date
20161014

Claims (6)

  1. Drive device (10) for a vehicle interior equipment component (13) comprising an adjustment motor (16) and a control unit (17), wherein the adjustment motor (16) is controlled by means of the control unit (17), wherein a sensor is assigned to the drive device (10) with the adjustment motor (16) and a transmission (36), wherein a pulse rate modifier (18) is interposed between the adjustment motor (16) and the control unit (17), which modifies a pulse rate (P motor ) received by the adjustment motor (16) such that it lies within a pulse rate value range (P control unit Max ) to be processed by the control unit (17) and wherein the pulse rate modifier (18) forwards a modified pulse rate value (P reduction ) to the control unit (17), characterized in that the pulse rate modifier (18) comprises a mechanical transmission (36) according to which the speed of the adjusting motor (16) can be modified by the transmission (36) such that it lies within a pulse rate value range to be processed by the control unit (17), wherein a sensor is assigned to a transmission stage of the transmission (36) which measures the speed (n transmission ) of the transmission stage which is in a certain gear ratio to the speed (n motor ) of the adjusting motor (16) and sends a corresponding pulse rate to the control unit (17).
  2. drive device (10) of the Claim 1 , characterized in that the pulse rate modifier (18) additionally comprises an electronic component.
  3. Drive device (10) according to one of the Claims 1 or 2 , characterized in that the gearbox (36) is arranged in a housing (22) in which a motor (30) is also accommodated.
  4. Drive device (10) according to one of the preceding claims, characterized in that the sensor is arranged on a part of at least two parts of the transmission (36), so that the sensitivity to mechanical influences and the degree of accuracy can be determined by the arrangement of the sensor.
  5. Adjustment device comprising a vehicle interior fitting (14) and a holding part (12), wherein the fitting (14) is adjusted by means of a drive device (10) according to one of the Claims 1 until 4 is movable relative to the holding part (12).
  6. Headrest (11) with a head section (14) which is mounted with at least one support rod (15) in at least one bearing on the backrest (12) of a vehicle seat (13), wherein the head section (14) is adjustable relative to the backrest (12), characterized in that the head section (14) and the backrest (12) have an adjustment device according to Claim 5 form, wherein the head section (14) is a fitting (14) and the backrest (12) is a support (12) and wherein the head section (14) is by means of a drive device (10) according to one of the Claims 1 until 3 is movable relative to the backrest (12).

Description

The invention relates to a drive device for a vehicle interior component. The vehicle is, for example, a land, air, or water vehicle. Such a drive device is known from prior use. Equipment components, such as height-adjustable headrests of vehicle seats, are equipped with an electric adjustment motor that moves the head section of the headrest relative to the backrest, e.g., up or down. The adjustment motor is controlled by a control unit, e.g., the seat control unit, according to the desired adjustment range and direction. The seat control unit uses a signal from the adjustment motor, which is provided to it in the form of a pulse rate corresponding to the motor's rotational speed. For this purpose, the adjustment motor includes a sensor that detects the rotational speed and converts it into a pulse rate corresponding to that speed. This could be, for example, a Hall sensor. The design of the component requires that the adjustment motor be compact, lightweight, and/or have a low noise level and/or minimal noise variation. The noise level of the adjustment motor is influenced, for example, by the load acting upon it. This load depends, for instance, on the direction of adjustment. Different loads act on the adjustment motor depending on whether the component is adjusted upwards (against gravity) or downwards (in the direction of gravity). For example, when a headrest is adjusted against gravity, the load on the adjustment motor is greater. This generally results in a different noise level than when the headrest is adjusted downwards (in the direction of gravity). Similarly, higher loads, caused by increased friction in the guides of the component or by lower temperatures, lead to a higher noise level from the adjustment motor. If conditions change across the adjustment range, fluctuations in the noise level can occur during operation of the adjustment motor. It is generally accepted that load fluctuations have a greater impact on running noise at high operating speeds than at low operating speeds. To meet the requirements for low weight and small size of the component, small adjustment motors are used. However, these must be operated at higher speeds. Load fluctuations then lead to greater noise fluctuations compared to adjustment motors with lower operating speeds. The required motor power depends on the maximum load possible within the system. This is determined by the existing friction coefficients of the guides, the influence of the headrest mass, and the influence of temperature changes. In small adjustment motors, this power is generally generated via high speeds, so that with variable loads, the operating speed is sometimes in a range where the pulse rate transmitted by a sensor can no longer be processed by standard control units and leads to failure of the control or drive system. The DE 10 2015 000 937 A1 This concerns a drive unit for a vehicle interior accessory. To meet the requirements for low weight and small size of the accessory, small actuator motors with high speeds are used, where the pulse rate transmitted by a sensor cannot be processed by standard control units and leads to failure of the control or drive system. The invention solves the problem by inserting a pulse rate modifier between the sensor of the adjustment motor and the control unit. As an example of such a pulse rate modifier, the DE 10 2015 000 937 A1 in paragraph 15 an electronic component, e.g. a frequency divider. Alternatively, paragraph 16 proposes a software solution as a pulse rate modifier, which is processed by a controller. The DE 10 2008 036 644 A1 This concerns an adjustment device for a motor vehicle seat with an electric motor and a gearbox connected to it. The task of DE 10 2008 036 644 A1 The goal was to reduce the weight and volume of the adjustment device. This is achieved by using a smaller, high-speed electric motor. DE 10 2008 036 644 A1 Paragraph 8 mentions that the small motors used, which operate at high speeds, require an additional gear stage that can be built cost-effectively. A pulse rate modification with regard to the pulse rate to be processed by a controller is in DE 10 2008 036 644 A1 not mentioned. The object of the invention was to modify the signals provided to the control unit by a sensor on a drive device for a vehicle interior accessory in such a way that their pulse rate lies within a range that can be processed by commercially available control units for all load ranges. In particular, the drive device comprises a high-speed adjustment motor. The problem was initially solved by a drive device having the features of claim 1. The drive unit is designed for adjusting a vehicle interior trim component relative to a mounting bracket. The drive unit comprises an adjustment motor, a control unit, and an adjustment mechanism that translates the motor's movement into movement of the trim component. The control unit regulates the speed and direction of rotation of the adjustment motor. The dr