A steering control unit includes a microcomputer (51) that performs sensorless control of driving of a motor by using an estimated electrical angle (θmb) estimated by calculation. The microcomputer (51) has a first estimation calculation state and a second estimation calculation state. In the first estimation calculation state, the microcomputer (51) calculates the estimated electrical angle (θmb) from a value obtained by accumulating a first additional angle (Δθm1) calculated by a first additional angle calculation circuit (80) on the basis of a voltage (E) induced in the motor. In the second estimation calculation state, the microcomputer (51) calculates the estimated electrical angle (θmb) from a value obtained by accumulating a second additional angle (Aθm2) calculated by a second additional angle calculation circuit (81) that performs torque feedback control that causes steering torque (Trq) to follow a target torque value (Trq*). In a low steering velocity state, the microcomputer (51) calculates the estimated electrical angle (θmb) in the second estimation calculation state.
STEERING CONTROL UNIT
LENKSTEUERUNGSEINHEIT
UNITÉ DE COMMANDE DE DIRECTION
2019-06-05
Patent
Elektronische Ressource
Englisch
IPC: | B62D MOTOR VEHICLES , Motorfahrzeuge |