Failure detection device for a rotation angle detection sensor

US20050000268A1Inactive Publication Date: 2005-01-06AISIN AW CO LTD
5 Cites 13 Cited by

Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
Publication Date
2005-01-06
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

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Embodiment Construction

[0023]FIG. 1(a) is a diagram of a failure detection device for an angular position sensor, applied to an automatic transmission, according to a first embodiment of the invention; and FIG. 1(b) is a sectional view along the line IB-IB in FIG. 1(a).

[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),...