Failure detection device for a rotation angle detection sensor

Inactive Publication Date: 2005-01-06
AISIN AW CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0013] Accordingly, one object of the present invention is to provide a failure detection device for an angular position sensor, which can assure detection of a failure, for example, failure of a detection element for detecting a rotational angle and to also

Problems solved by technology

With the non-contact type rotational position (“angular position”) sensors used in a transmission, as disclosed in the aforementioned U.S. 5,846,160, there is the possibility that even when the movable-side terminal rotates with rotation of the manual shaft, the voltage corresponding to the rotational angle of the movable-side terminal may not change, i.e. a “stickin

Method used

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  • Failure detection device for a rotation angle detection sensor
  • Failure detection device for a rotation angle detection sensor
  • Failure detection device for a rotation angle detection sensor

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Example

[0024] As shown in FIG. 1(a) and FIG. 1(b), in this first embodiment, a failure detection device 1 for an angular position (rotational angle) sensor is applied in an A / T (automatic transmission). The position sensor failure detection device 1 is attached to a manual shaft 3 external to A / T case 2. The position sensor failure detection device 1 comprises angular position sensor 5 including first and second Hall effect transistors 4a and 4b as detection elements, an electronic control unit 6 (ECU, corresponding to a control unit in the embodiment of the invention) for controlling the A / T, A / T solenoids controlled by the ECU 6, a connecter 7 including plural terminals for connecting to plural controlled devices (i.e. an engine, an indicator), and an ECU case 8.

[0025] The angular position sensor 5 further comprises an annular internal core 9, made of soft magnetic material and fixed to the manual shaft 3, and an annular external core 10, made of soft magnetic material and fixed, concen...

Example

[0058] As described above, this second embodiment operates without comparing the first and second output voltages, from the first and second detection elements 4a, 4b, with predetermined values. Instead, simply by detecting that one output voltage is changing, while the other sensor voltage value hardly changes, a sticking failure of the detection elements is easily and reliably determined. Therefore, a logic for comparing and calculating the sensor voltage outputs with predetermined values becomes unnecessary, and the logic can be simplified and the control for detecting a sticking failure can be made more accurate. Other structures and advantages of the sticking failure detection device in this second embodiment are same as those of the first embodiment.

[0059] As shown in FIG. 5, the inclinations of the input-output characteristics of the first and second detection elements 4a, 4b are in the same direction and have different absolute values. However, the invention is not so limit...

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Abstract

A failure detection device for detecting a failure of a rotation angle detection sensor, which sensor detects a rotational angle through which a rotary member has rotated, the failure detection device including a first detection element which has an output which increases as the rotational angle of the rotary member increases, a second detection element which has an output that decreases as the rotational angle of the rotary member increases, and a detecting unit that detects the failure of either the first detection element or the second detection element by comparing a calculated value, based on the outputs of both of the first and second detection elements, with at least one predetermined value.

Description

INCORPORATION BY REFERENCE [0001] The disclosure of Japanese Patent Application No. 2003-118086 filed on Apr. 23, 2003, including the specification, drawings, and claims is incorporated herein by reference in its entirety. CROSS-REFERENCE TO RELATED APPLICATION [0002] The priority of Japanese Application No. 2003-118086 is claimed under 35 USC 119. BACKGROUND OF THE INVENTION [0003] 1. Field of Invention [0004] This invention relates to a failure detection device for detecting failure of a rotation angle detection sensor, which sensor detects the angular position of a rotatable member. [0005] 2. Description of Related Art [0006] Conventionally, in a vehicle where shift control is performed by an A / T (Automatic Transmission) or a CVT (Continuously Variable Transmission), when a range is selected by operation of a shift lever, an electronic control unit (ECU) for the transmission responds by controlling solenoids, for example, utilizing a shifting logic for the selected range, and the...

Claims

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Application Information

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IPC IPC(8): G01B7/30F16H59/10F16H61/12G01D3/08G01D5/14
CPCF16H59/105F16H61/12F16H2061/1208F16H61/0006G01D5/145F16H2061/1284G01D3/08H02H3/04H01H83/04H01H83/144
Inventor KUWATA, MASAYUKINIINOMI, TORUKOMATSU, KATSUTOSHISAITOU, MASAOSUZUKI, KENJINOMURA, TOMOKAZU
Owner AISIN AW CO LTD
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