Steer-by-wire electrical power steering device, and control method therefor
An electric power steering device of a steer-by-wire type includes: a steering input mechanism, which includes a steering wheel to be operated by a driver; a reaction force motor, which is configured to apply a steering reaction force to the steering wheel; a steering motor, which is configured to output a steering force; a steering mechanism, which is prevented from being mechanically connected to the steering input mechanism, and is configured to steer a steered wheel through the steering force generated by the steering motor; and a drive control device, which is configured to carry out drive control for the steering motor and the reaction force motor. At least one of the steering motor or the reaction force motor is constructed of a double-winding motor of a double-inverter type in which each of windings is duplexed, and the respective duplexed windings are individually driven by two inverters.
1. An electric power steering device comprising:
a steering input mechanism, which includes a steering wheel to be operated by a driver;
a reaction force motor, which is configured to apply a steering reaction force to the steering wheel;
a steering motor, which is configured to output a steering force, and is constructed of a double-winding motor of a double-inverter type in which each of one or more windings is duplexed, and the respective one or more duplexed windings are individually driven by two inverters;
a steering mechanism, which is mechanically unconnected to the steering input mechanism, and is controlled in accordance with a steering angle of the double-winding motor of the double-inverter type, and is configured to steer a steered wheel through the steering force generated by the steering motor; and
a drive controller, which is configured to carry out drive control for the steering motor and the reaction force motor.
2. The electric power steering device according to claim 1 , wherein the double-winding motor of the double-inverter type comprises a three-phase double-winding motor of the double-inverter type including two sets of three-phase windings and the two inverters configured to individually drive the respective two sets of the three-phase windings.
3. The electric power steering device according to claim 2 , wherein the steering motor comprises the three-phase double-winding motor of the double-inverter type.
4. The electric power steering device according to claim 3 ,
wherein the steering motor comprised of the three-phase double-winding motor of the double-inverter type includes two steering motors, and
wherein the two steering motors are provided together.
5. The electric power steering device according to claim 3 , wherein, when the drive controller receives a feedback signal indicating a failure from the three-phase double-winding motor of the double-inverter type, in accordance with a set condition, the drive controller controls a drive current to a winding of a failed system out of two systems of the windings of the three-phase double-winding motor, a winding of a non-failed system, or, in a case where another motor is provided together, a winding of the another motor provided together.
6. The electric power steering device according to claim 2 , wherein the reaction force motor comprises the three-phase double-winding motor of the double-inverter type.
7. The electric power steering device according to claim 6 , wherein, when the drive controller receives a feedback signal indicating a failure from the three-phase double-winding motor of the double-inverter type, in accordance with a set condition, the drive controller controls a drive current to a winding of a failed system out of two systems of the windings of the three-phase double-winding motor, a winding of a non-failed system, or, in a case where another motor is provided together, a winding of the another motor provided together.
8. The electric power steering device according to claim 2 , wherein, when the drive controller receives a feedback signal indicating a failure from the three-phase double-winding motor of the double-inverter type, in accordance with a set condition, the drive controller controls a drive current to a winding of a failed system out of two systems of the windings of the three-phase double-winding motor, a winding of a non-failed system, or, in a case where another motor is provided together, a winding of the another motor provided together.
9. The electric power steering device according to claim 1 , wherein the double-winding motor of the double-inverter type is a three-phase double-winding motor of the double-inverter type, and
wherein, when the drive controller receives a feedback signal indicating a failure from the three-phase double-winding motor of the double-inverter type, in accordance with a set condition, the drive controller controls a drive current to a winding of a failed system out of two systems of the windings of the three-phase double-winding motor, a winding of a non-failed system, or, in a case where another motor is provided together, a winding of the another motor provided together.
10. An electric power steering device comprising:
a steering input mechanism, which includes a steering wheel to be operated by a driver;
two reaction force motors, which are provided together and configured to apply a steering reaction force to the steering wheel;
a steering motor, which is configured to output a steering force;
a steering mechanism, which is mechanically unconnected to the steering input mechanism, and is configured to steer a steered wheel through the steering force generated by the steering motor; and
a drive controller, which is configured to carry out drive control for the steering motor and the reaction force motors,
wherein each of the two reaction force motors is constructed of a three-phase double-winding motor of a double-inverter type in which each winding is duplexed, and the respective duplexed windings are individually driven by two inverters.
11. An electric power steering device comprising:
a steering input mechanism, which includes a steering wheel to be operated by a driver;
a reaction force motor, which is configured to apply a steering reaction force to the steering wheel;
a steering motor, which is configured to output a steering force;
a steering mechanism, which is mechanically unconnected to the steering input mechanism, and is configured to steer a steered wheel through the steering force generated by the steering motor; and
a drive controller, which is configured to carry out drive control for the steering motor and the reaction force motor,
wherein each of the steering motor and the reaction force motor comprises a three-phase double-winding motor of a double-inverter type in which each of one or more windings is duplexed, and the respective one or more duplexed windings are individually driven by two inverters.
12. The electric power steering device according to claim 11 ,
wherein the steering motor comprised of the three-phase double-winding motor of the double-inverter type includes two steering motors, and
wherein the two steering motors are provided together.
13. The electric power steering device according to claim 11 ,
wherein the reaction force motor comprised of the three-phase double-winding motor of the double-inverter type includes two reaction force motors, and
wherein the two reaction force motors are provided together.
14. The electric power steering device according to claim 11 ,
wherein the steering motor comprised of the three-phase double-winding motor of the double-inverter type includes two steering motors,
wherein the two steering motors are provided together,
wherein the reaction force motor comprised of the three-phase double-winding motor of the double-inverter type includes two reaction force motors, and
wherein the two reaction force motors are provided together.
15. The electric power steering device according to claim 11 , wherein, when the drive controller receives a feedback signal indicating a failure from the three-phase double-winding motor of the double-inverter type, in accordance with a set condition, the drive controller controls a drive current to a winding of a failed system out of two systems of the windings of the three-phase double-winding motor, a winding of a non-failed system, or, in a case where another motor is provided together, a winding of the another motor provided together.
16. A method of controlling an electric power steering device, the method comprising:
constructing at least one of a reaction force motor, which is configured to apply a steering reaction force to a steering wheel of a steering input mechanism to be operated by a driver, or a steering motor, which is configured to output a steering force to a steering mechanism that is mechanically unconnected to the steering input mechanism, and is controlled in accordance with a steering angle, of a double-winding motor of a double-inverter type in which each winding is duplexed, and the respective duplexed windings are individually driven by two inverters; and
controlling, when the double-winding motor of the double-inverter type fails, in accordance with a set condition, a drive current to a winding of a failed system out of two systems of the windings of the double-winding motor, a winding of a non-failed system, or, in a case where another motor is provided together, a winding of the another motor provided together.