A motor control apparatus that calculates duty command values of respective phases for controlling currents of a motor by means of a control calculation, forms PWM-signals in correspondence to the duty command values, drives the motor by means of an inverter based on the PWM-signals, and which is provided a rotation sensor to detect a motor angle of the motor.

The disclosure provides a steering system for a vehicle. The steering system may include a steering rack and an electronic power steering (EPS) system. The EPS system may include an actuator that assists movement of the steering rack, a torque sensor; an angle sensor; and an EPS system controller. The EPS controller may be configured to determine a steering rack center point indicating a center of the steering rack between opposite maximum steering angles. The EPS controller may be configured to determine a vehicle center zero point. The EPS controller may be configured to store the vehicle center zero point in response to determining that the vehicle center zero point is within a threshold of the steering rack center point.

A lane departure avoidance system disables start of steering control or terminate running steering control upon determination that a value of a at least one selected variation, which is selected from a first variation, a second variation, a third variation, and a fourth variation, is equal to or more than a corresponding threshold. The first variation is a variation of a lateral position of an own vehicle relative to lane marking lines recognized by a recognition unit, and the second variation is a variation of a yaw angle of the own vehicle relative to the recognized lane marking lines. The third variation is a variation of a curvature of the recognized lane marking lines, and the fourth variation is a variation of a pitch angle of the own vehicle.

An inverter includes a positive electrode terminal and a negative electrode terminal, upper-arm switching elements and lower-arm switching elements, and a voltage divider that supplies partial voltages of a voltage between the positive electrode terminal and the negative electrode terminal to a gate and a drain, respectively, of the lower-arm switching element. The lower-arm switching element includes an HEMT. In the voltage divider, the partial voltages are set to turn the lower-arm switching element off when a positive electrode and a negative electrode of a DC power supply are reversely connected to the positive electrode terminal and the negative electrode terminal, respectively.

A method for controlling a switched reluctance motor, the method comprising: receiving a reference torque T.sub.e ref; receiving an indication of a present rotor position θ for the switched reluctance motor; determining at least one of: a reference current i.sub.e.sub._.sub.ref(k−1) for a (k−1).sup.th phase, a reference current i.sub.e.sub._.sub.ref(k) for a (k).sup.th phase, and a reference current i.sub.e.sub._.sub.ref(k+1) for a (k+1).sup.th phase; and outputting the determined at least one reference current to a current controller operatively coupled to the switched reluctance motor, wherein the determined at least one reference current is based on an objective function comprising the squares of phase current and derivatives of current reference.

An object of the present invention is to reduce an inductance of a power circuit, reduce a switching loss and a noise level and improve a voltage-use ratio of a battery power in a redundant-type electronic control device.

An electronic control device that controls a motor has power modules 11a, 11b to drive the motor. Power terminals 32pua, 32pva and 32pwa of the power module 11a are arranged in positions that are close to and face power terminals 32nub, 32nvb and 32nwb of the power module 11b, which are opposite to the power terminals 32pua, 32pva and 32pwa of the power module 11a in polarity. Power terminals 32nua, 32nva and 32nwa drawn from a longitudinal end portion 311 of the power module 11a are arranged in positions that are close to and face power terminals 32pub, 32pvb and 32pwb drawn from a longitudinal end portion 311 of the power module 11b which are opposite to the power terminals 32nua, 32nva and 32nwa of the power module 11a in polarity.

A motor control device includes a third harmonic calculation unit (60) configured to calculate a first third harmonic on a basis of an average value between a voltage command value of a maximum phase with a maximum duty ratio and a voltage command value of a minimum phase with a minimum duty ratio among three-phase voltage command values; an amplitude calculation unit (61) configured to calculate an amplitude of the three-phase voltage command values; a third harmonic conversion unit (62, 62′, 63, 65-67) configured to convert the first third harmonic into a second third harmonic on a basis of the first third harmonic and the amplitude; a correction unit (64) configured to correct the three-phase voltage command values by subtracting the second third harmonic from the three-phase voltage command values.

A power relay unit includes a high potential side relay connected so that an anode of a parasitic diode is on a high potential side and a cathode is on a low potential side, and a low potential side relay connected in series with a low potential side of the high potential side relay so that a cathode of a parasitic diode is on a high potential side and an anode is on a low potential side. A relay-to-relay connection line connects an intermediate point between the first high potential side relay and the first low potential side relay and an intermediate point between the second high potential side relay and the second low potential side relay. A control unit controls an on/off operation of the first high potential side relay based on a first supply voltage, a second supply voltage, and a relay intermediate voltage.

A motor control apparatus includes an inverter, a driver, a negative voltage circuit, a voltage dividing circuit, and a detection unit. The inverter includes an upper-arm switching element and a lower-arm switching element to supply a voltage of a node between the upper-arm switching element and the lower-arm switching element to a motor as a phase voltage. The driver applies a first voltage or a second voltage to the upper-arm switching element to control and turn the upper-arm switching element on and off. The negative voltage circuit supplies a voltage lower than the voltage of the node to the driver as the second voltage. The voltage dividing circuit performs voltage division between the negative voltage circuit and a negative power supply. The detection unit outputs a signal based on a voltage resulting from the voltage division by the voltage dividing circuit.

The disclosure relates to a steering control system, a steering control device, and a steering control method. According to an embodiment of the disclosure, there is provided a steering control device, comprising a receiver receiving sensing data from at least one of a rack bar position sensor or a rack force sensor, a controller generating a first control signal to move a road wheel actuator and a second control signal to move the road wheel actuator and a transmitter transmitting the first control signal and the second control signal to the road wheel actuator.