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Battery condition diagnosis apparatus

A state diagnosis, battery technology, applied in the direction of motor, measuring electricity, electric vehicle, etc., can solve the problem of high power, the motor cannot generate steering torque, consumption, etc., and achieve the effect of accurate diagnosis results

Inactive Publication Date: 2008-11-12
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electric power steering apparatus, which controls the amount of power supplied to the motor to give steering torque according to the operating state of the steering wheel, consumes a large amount of electric power
Therefore, when the capacity of the battery is reduced (hereinafter referred to as "deterioration"), there is a limit to the amount of power supplied to the electric motor (which generates steering torque), causing the electric motor to be unable to generate a predetermined steering torque, and the power supplied to the simultaneous operation The voltage of other electronic control systems will reduce the

Method used

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Embodiment Construction

[0071] An electric power steering apparatus equipped with a battery state diagnostic apparatus according to an embodiment of the present invention will now be described with reference to the drawings. FIG. 1 schematically shows an electric power steering apparatus according to the present embodiment.

[0072] This electric steering apparatus (denoted by reference numeral 1) is mainly composed of a steering assist mechanism 10 for applying steering assist force to steerable wheels to be steered, and an assist control mechanism for driving and controlling an electric motor 15 of the steering assist mechanism 10. The device 30 constitutes.

[0073] The steering assist mechanism 10 converts the rotation of the steering shaft 12 around its axis (generated by the rotational operation of the steering wheel 11 ) into the motion of the rack 14 along the axis through the rack and pinion mechanism, thereby according to the rotation of the rack 14 The axial movement is used to steer the ...

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Abstract

A battery condition diagnosis apparatus for a vehicle gradually supplies electricity to an electric motor 15 of an electric power steering apparatus 1 when a predetermined time elapses after an ignition switch 80 is turned off. The apparatus diagnoses the deteriorated condition of the battery 60 on the basis of the amount of supplied electricity and the detected battery voltage which changes in accordance therewith. The electric motor 15 may be a brushless DC motor. In this case, current is supplied to the electric motor 15 such that only d-axis armature current Id in the d-q coordinate system flows, to thereby prevent the electric motor 15 from rotating, whereby safety is secured. Accordingly, the condition of the battery can be accurately diagnosed by supplying electricity to the electric motor without changing the condition of the vehicle.

Description

technical field [0001] The present invention relates to a battery state diagnosis device for diagnosing the state of a battery that supplies electric power to a plurality of electronic control systems provided in a vehicle. Background technique [0002] Generally, an electric power steering apparatus has been known as one example of an electronic control system supplied with electric power from a battery mounted on a vehicle. The electric power steering apparatus, which controls the amount of power supplied to the electric motor to give steering torque according to the operating state of the steering wheel, consumes a large amount of electric power. Therefore, when the capacity of the battery is reduced (hereinafter referred to as "deterioration"), there is a limit to the amount of power supplied to the electric motor (which generates steering torque), causing the electric motor to be unable to generate a predetermined steering torque, and the power supplied to the simultane...

Claims

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Application Information

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IPC IPC(8): G01R31/36B62D5/04B60R16/04H02P6/06H02P6/08H02P6/16H02P6/28
CPCY02T10/642Y02E60/10
Inventor 河西荣治
Owner TOYOTA JIDOSHA KK
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