Electric power steering apparatus
AssigneeHonda Motor Co., Ltd.
InventorKoji Sasajima
Life of this patent
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Abstract
When a current input to a step-up voltage device of an electric power steering apparatus is equal to or higher than a first threshold current and an input voltage applied to the step-up voltage device is lower than a first threshold voltage, the step-up voltage device of the electric power steering apparatus discontinuously switches an output voltage to a voltage lower than a rated step-up voltage. When the input voltage becomes lower than a second threshold voltage which is lower than the first threshold voltage, the step-up voltage device sets the output voltage to a voltage equal to the input voltage.
Claims14
An electric power steering apparatus comprising:
- a motor providing a steering force;
- a step-up voltage apparatus which steps up an applied voltage output by an electric power supply;
- and
- a drive control apparatus which drives the motor with a target current based on a steering input by using an output voltage of the step-up voltage apparatus, the drive control apparatus including:
- a current monitor apparatus which monitors an input current;
- and
- a voltage monitor apparatus which monitors the applied voltage, wherein
- the step-up voltage apparatus outputs a rated step-up voltage to drive the motor, and wherein, when the input current to the step-up voltage apparatus is equal to or higher than a first threshold current set in the step-up voltage apparatus, and a voltage applied to the step-up voltage apparatus is lower than a first threshold voltage set in the step-up voltage apparatus, the step-up voltage apparatus discontinuously switches the output voltage to a voltage lower than the rated step-up voltage.
Dependencies are inferred from the claim text.