Controller for determining abnormality of a pulse outputter
AssigneeDenso Corporation
InventorJun Tarui
Life of this patent
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Abstract
A controller has an encoder that outputs four-phase pulse signals according to a rotation of a rotor of a motor by a rule. During a rotational drive of the motor, when (i) an abnormal pulse state is observed in which the pulse signal is output in a non-compliant manner with the rule and (ii) a lapse time from a last normal output timing, which is a last timing of an output of the pulse signal by the rule, is longer than a threshold determination time, it is conclusively determined that the encoder has abnormality. Thus, the encoder is provided with an improved noise-proof character, and is prevented from being falsely determined as abnormal due to the abnormal pulse state, even when an output of the pulse signal from the encoder is temporarily ridden by a noise.
Claims7
A controller comprising:
- a pulse outputter outputting a pulse signal according to a rotation of a measurement object, the pulse signal outputted as a signal having at least three phases by a rule, according to the rotation of the measurement object;
- and
- a determiner determining whether the pulse outputter has abnormality, based on the pulse signal, wherein
- the determiner determines that the pulse outputter has abnormality when (i) it is determined as being in an abnormal pulse state in which output of the pulse signal is non-compliant with the rule, and (ii) a lapse time from a last normal output timing is longer than a threshold determination time.
Dependencies are inferred from the claim text.