Electric power steering device
AssigneeMitsubishi Electric Corporation
InventorsSeiichi IMAIZUMI, Susumu ZENIYA, Yuji TAKATSUKA, Yasushi TAKEMOTO
Life of this patent
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Abstract
A shortening of an initial diagnosis time is achieved, even after an elapse of a predetermined delay time from an ignition switch being switched to an off-state. After the ignition switch is switched to an off-state after an operation of a control device, which drives an electric motor that applies steering assistance force to a steering system, diagnosis of a power supply circuit that supplies power to the control device is carried out, and a diagnosis item to be implemented in a succeeding initial diagnosis is determined based on a result of the diagnosis.
Claims2
An electric power steering device, comprising:
- a steering assistance mechanism including an electric motor that applies a steering assistance force to a steering system;
- and
- a control device that drives the electric motor, wherein the control device includes
- an arithmetic processing device that carries out an initial diagnosis including a diagnosis of power interruption means of the control device at least when an ignition switch is switched to an on-state, causes the control device to operate when a result of the initial diagnosis is that there is no impediment to an operation of the control device, carries out a diagnosis of the power interruption means after the ignition switch is switched to an off-state after the control device operates, and determines a diagnosis item to be implemented in a succeeding initial diagnosis based on a result of the diagnosis.
Dependencies are inferred from the claim text.