Motor control method, fluid supply device, vehicle height adjustment device, and saddle-type vehicle
AssigneeHitachi Astemo, Ltd.
InventorNaoya Kuroiwa
Life of this patent
Estimating the term…
Abstract
A motor control method includes a determination step of determining whether a contact portion exists, which is a portion where the screw and the nut member are in contact with each other at a location different from a mating portion, when the motor is energized to move the nut member in a first direction, and when the contact portion is determined to exist in the determination step, a return step of energizing the motor to move the nut member in a second direction opposite to the first direction until the contact portion no longer exists.
Claims20
A motor control method for controlling an operation of a motor in a fluid supply device including the motor, a speed reducer connected to an output shaft of the motor, a screw connected to the speed reducer, a nut member which is fitted to the screw and moves in an axial direction of a rotation shaft of the screw as the screw rotates, a piston movable in the axial direction due to the nut member moving in the axial direction, and a storage chamber configured to store fluid of which a capacity increases or decreases as the piston moves in the axial direction, the method comprising the steps of:
- determining whether a contact portion exists, which is a portion where the screw and the nut member are in contact with each other at a location different from a mating portion, when the motor is energized to move the nut member in a first direction;
- and
- energizing the motor to move the nut member in a second direction opposite to the first direction until the contact portion no longer exists when the contact portion is determined to exist.
A fluid supply device, comprising:
- a motor;
- a speed reducer connected to a rotation shaft of the motor;
- a screw connected to the speed reducer;
- a nut member which is fitted to the screw and moves in an axial direction of a rotation shaft of the screw as the screw rotates;
- a piston movable in the axial direction due to the nut member moving in the axial direction;
- a storage chamber configured to store fluid of which a capacity increases or decreases as the piston moves in the axial direction;
- and
- a control device configured to control an operation of the motor, wherein:
- the control device includes a determination unit configured to determine whether a contact portion exists, which is a portion where the screw and the nut member are in contact
- with each other at a location different from a mating portion;
- and
- when the determination unit determines that the contact portion exists while the motor is energized to move the nut member in a first direction, the control device is configured to energize the motor to move the nut member in a second direction opposite to the first direction until the contact portion no longer exists.
Dependencies are inferred from the claim text.