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Abnormality detecting apparatus for wheel speed sensors and automobile incorporating the same

a technology of abnormality detection and detecting apparatus, which is applied in the direction of instruments, braking systems, vehicle position/course/altitude control, etc., to achieve the effect of high detection accuracy

Inactive Publication Date: 2006-05-18
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an abnormality detecting apparatus for wheel speed sensors with high detection accuracy. This apparatus can detect abnormality of the wheel speed sensors based on the calculated wheel speeds and preset threshold values. The apparatus can be used in vehicles and automobiles, and can help prevent accidents caused by abnormal wheel speed sensors. The technical effects of this invention include high detection accuracy, simple apparatus configuration, and improved safety for vehicles and automobiles.

Problems solved by technology

The abnormality detecting portion stops a motive power transmission operation of the power transmission when abnormality of the wheel speed sensors is detected.

Method used

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  • Abnormality detecting apparatus for wheel speed sensors and automobile incorporating the same
  • Abnormality detecting apparatus for wheel speed sensors and automobile incorporating the same
  • Abnormality detecting apparatus for wheel speed sensors and automobile incorporating the same

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Embodiment Construction

[0035] In the following, an embodiment of the present invention will be described in detail referring to the drawings. Throughout the drawings, identical reference characters denote identical or corresponding parts.

[0036]FIG. 1 is a schematic view showing a vehicle incorporating an abnormality detecting apparatus for wheel speed sensors according to the embodiment of the present invention. It is noted that, in the following description, it is assumed that the vehicle employs what is called front-wheel based standby 4WD scheme, where front wheels FL and FR are driving wheels and rear wheels RL and RR are idler wheels.

[0037] Referring to FIG. 1, the vehicle includes an engine 10, a front differential 12, axles 16, 18, 32, and 34, front wheels FL and FR, rear wheels RL and RR, a propeller shaft 20, a power transmission 30, a linear solenoid valve 60, a rear differential 26, an ECU (Electrical Control Unit) 40, and wheel speed sensors 50a-50d.

[0038] An output of engine 10 is split fr...

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Abstract

Wheel speed sensors arranged at each of driving wheels and idler wheels detect rotational speeds of corresponding wheels. ECU includes a wheel speed calculating portion calculating wheel speeds of the driving wheels and the idler wheels based on the detected rotational speeds, and an abnormality detecting portion detecting abnormality of the wheel speed sensors based on the calculated wheel speeds. The abnormality detecting portion detects the abnormality of the wheel speed sensors based on: a first wheel speed that is at least one of the wheel speeds of the driving wheels and the idler wheels being substantially zero; at least one of the wheel speeds except for the first wheel speed being greater than a prescribed threshold value; and an average wheel speed of the idler wheels being greater than an average wheel speed of the driving wheels.

Description

[0001] This nonprovisional application is based on Japanese Patent Application No. 2004-328974 filed with the Japan Patent Office on Nov. 12, 2004, the entire contents of which are hereby incorporated by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to an abnormality detecting apparatus for wheel speed sensors and an automobile incorporating the same. More specifically, it relates to an abnormality detecting apparatus for wheel speed sensors with detection performance of high accuracy and an automobile incorporating the same. [0004] 2. Description of the Background Art [0005] Conventionally, wheel speed sensors for detecting the wheel speed of each wheel are incorporated in an ABS (Antilock Brake System) apparatus that prevents wheels from locking during braking, or in an automatic braking apparatus that generates braking force for preventing slip or generating yaw moment to stabilize the attitude of the vehicle that is ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06F17/00
CPCB60T8/885B60T2270/416
Inventor OHBA, MITSURU
Owner TOYOTA JIDOSHA KK