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Vehicle instrument panel with magnet equipped pointer

A technology of instrument panel and pointer, applied in the direction of vehicle components, instrument layout, measurement value indication, etc., can solve problems such as inaccuracy of gauges

Inactive Publication Date: 2015-02-11
DELPHI TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the pointer angle is unknown when power is applied, sometimes the motor hits the internal hard stop with enough force to bounce the motor drive back a step or two, and the gauge becomes inaccurate as a result

Method used

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  • Vehicle instrument panel with magnet equipped pointer
  • Vehicle instrument panel with magnet equipped pointer
  • Vehicle instrument panel with magnet equipped pointer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] figure 1 with 2 Shown is a non-limiting example of a portion of a vehicle dashboard assembly, hereinafter referred to as assembly 10, configured to determine assembly 10 driven by stepper motor 12 ( figure 2 ) the orientation angle of the pointer 14 actuated. In general, pointer 14 rotates about an axis to point to indicia on a display surface (not shown) of assembly 10 .

[0011] The stepper motor 12 in this example is part of a motor assembly 18 that may include a reduction gearing 20 that couples the stepper motor 12 to the pointer 14, requiring multiple revolutions of the stepper motor's rotor 22 (e.g. One hundred (100) turns or rotations) move pointer 14 through a range of motion (eg, two hundred and forty degrees (240°)). Thus, stepper motor 12 is coupled to pointer 14 through reduction gearing 20 . The motor assembly 18 may also include a housing 26 and a cover 28 which together hold the various components (gears, rotor and stator) forming the stepper motor ...

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PUM

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Abstract

A vehicle instrument panel assembly (10) configured to determine an orientation angle (32) of a stepper motor (12) actuated pointer (14, 114) of the assembly (10). The assembly (10) includes a pointer (14, 114), a stepper motor (12), a magnet (24), and a sensor (34). The pointer (14, 114) is movable about an axis (16, 116) to point to indicia on a display surface of the assembly (10). The stepper motor (12) is coupled to the pointer (14, 114) via a reduction gear arrangement (20). The magnet (24) is fixedly coupled to the pointer (14, 114) such that a magnetic field direction (30) generated by the magnet (24) corresponds to an angle (32) of the pointer (14, 114). The sensor (34) is configured to determine the magnetic field direction (30) of the magnet (24) and output a signal indicative of the angle (32) of the pointer (14, 114).

Description

technical field [0001] The present invention relates generally to vehicle dashboard assemblies, and in particular to a pointer equipped with a magnet so that a magnetic field sensor can determine the pointer angle. Background technique [0002] When assembling a vehicle dashboard assembly with conventional needles, a camera is used to determine any offset error between the actual needle position and the desired needle position corresponding to the markings or scales on the display. This offset is programmed into the dashboard to ensure that it is applied every time power is applied to the dashboard. If power to the instrument panel is interrupted during normal operation, the instrument cluster performs a "reset" operation to rotate the needle back to the zero position. Because the pointer angle is unknown when power is applied, sometimes the motor hits the internal hard stop with enough force to bounce the motor drive back a step or two, and the gauge becomes inaccurate as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60K37/02G01C17/02G01D7/00
CPCG01R33/07G01D5/145B60K37/02B60K2350/408G01D13/26G01P1/08G01P1/11B60K35/60B60K2360/336B60K2360/48B60K2360/695B60K2360/6992B60K2360/698B60K35/20B60K37/20
Inventor S·C·布莱克梅M·J·克拉格斯顿S·A·里伯迪
Owner DELPHI TECH INC