Electric power steering apparatus having increased number of sensor signals for safety enhancement
The present disclosure relates to an electric power steering apparatus. An embodiment of the present disclosure provides an electric power steering apparatus including a three-channel torque sensor, a three-channel motor position sensor, and a single-wound BLAC motor, and an ECU configured to control steering.
1. An electric power steering apparatus comprising:
a three-channel torque sensor;
a three-channel motor position sensor;
a single-wound Brushless AC (BLAC) motor; and
an Electronic Control Unit (ECU) configured to control steering.
2. The electric power steering apparatus of claim 1 , wherein, when all of a first torque signal, a second torque signal, and a third torque signal of the three-channel torque sensor have a same value, the ECU uses the first torque signal for steering control, and
when two of the first torque signal, the second torque signal, and the third torque signal of the three-channel torque sensor have a same value and a remaining signal value is different from the same value, the ECU uses the same signal value for steering control.
3. The electric power steering apparatus of claim 1 , wherein, when all of a first motor position signal, a second motor position signal, and a third motor position signal of the three-channel motor position sensor have a same signal value, the ECU uses the first motor position signal for motor control, and
when two of the first motor position signal, the second motor position signal, and the third motor position signal of the three-channel motor sensor have a same signal value and a remaining signal value is different from the same signal value, the ECU uses the same signal value as the signal value for steering control.
4. An electric power steering apparatus comprising:
a four-channel torque sensor comprising two independent dual die ICs;
a three-channel motor position sensor;
a single-wound Brushless AC (BLAC) motor; and
an ECU configured to control steering.
5. An electric power steering apparatus of claim 4 , wherein, when two or more of the first torque signal, the second torque signal, the third torque signal, and the fourth torque signal of the four-channel torque sensor have a same torque signal value, the ECU calculates a torque value based on the same torque signal value.
6. An electric power steering apparatus of claim 4 , wherein, when all of a first motor position signal, a second motor position signal, and a third motor position signal of the three-channel motor position sensor have a same signal value, the ECU uses the first torque signal for motor control, and
when a signal value of one of the first motor position signal, the second motor position signal, and the third motor position signal of the three-channel motor position sensor is different from remaining two signal values, and the remaining two signal values are equal to each other, the ECU uses one of the remaining two signal values for motor control.