Toyota Jidosha Kabushiki Kaisha

Hidenori Matsuto

Koji Ito

Toshinori Esaka

Takeshi Tachibana

According to the present invention, a power supply control device for an electric power steering device used for a power supply system comprises a main batteryconnected to the electric power steering device via a first power supply line and a sub-batteryconnected to the electric power steering device via a second power supply line, wherein when detecting the state of the sub-battery, said power supply control device restricts or disconnects power supply from the main battery to the electric power steering device while it permits power supply from the sub-battery to the electric power steering device, characterized in that said power supply control device prevents the detection of the state of the second battery if a vehicle speed is higher than a predetermined reference value.

Power source control device for power steering

An electric power source system in which a momentary interruption of the electric power supply does not occur when the direction of voltage conversion is switched by a voltage conversion device that is capable of bidirectional voltage conversion. The electric power source system includes a bidirectional switching regulator that selectively switches between the voltage conversion in the step-up direction from a low-voltage system to a high-voltage system and the voltage conversion in the step-down direction from the high-voltage system to the low-voltage system, and a linear regulator, connected in parallel to the bidirectional switching regulator, that converts voltage in the step-down direction. The direction of current that flows via the bidirectional switching regulator switches from the step-up direction to the step-down direction after current flows in the step-down direction via the linear regulator.

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Toyota, Japan

Hidenori Matsuto