A rotary electric machine control device for a rotary electric machine having winding sets with coils includes: an inverter for each winding set; a power source relay for each inverter; a terminal voltage detector detecting a terminal voltage of each coil; and a controller including an inverter controller, a relay controller and an abnormality determination unit. Each winding set and a corresponding inverter provides a system. When the rotary electric machine is driven using a normal system: the relay controller controls the power source relay to cut off power supply from a power source to the inverter in an abnormal system; the abnormality determination unit specifies a short-circuited location based on the terminal voltage in the abnormal system; and the inverter controller corrects a command value related to control of the inverter in the normal system according to a specified short-circuited location.

Provided is an apparatus for limiting rotation of a steering wheel, and more particularly, an apparatus for limiting rotation of a steering wheel, whereby a rotation angle of the steering wheel can be limited to a predetermined angle. The apparatus for limiting rotation of the steering wheel, installed in a steering system, includes: an end-stopper disposed inside a housing through which a steering shaft on which the steering wheel is installed, passes, and the end-stopper limiting a rotation angle of the steering wheel to a predetermined angle.

An electric power steering device includes an electric motor driven by electric power from a power supply and configured to apply an assisting force to a steering shaft, a booster circuit connected to the power supply and configured to supply a boosting voltage to the electric motor, and a boosting control unit configured to determine a starting condition under which the start of boosting of the booster circuit is controlled on the basis of an angular acceleration of the electric motor, and start the boosting of the booster circuit when the determined starting condition is satisfied.

A drive control unit in which a drive control system for a motor is made redundant so that a motor having two coil sets is individually driven and controlled for each coil set includes an inverter substrate on which a first inverter circuit that drives each coil of a first coil set, and a second inverter circuit that drives each coil of a second coil set are formed; a control substrate on which a first control circuit that includes a microcomputer which controls the first inverter circuit, and a second control circuit that includes a microcomputer which controls the second inverter circuit are formed; and a housing in which the inverter substrate and the control substrate are arranged in parallel to each other. The first control circuit is positioned on the front surface side, and the second control circuit is positioned on the rear surface side of the control substrate.

A control device for an electric power steering (EPS) system may include a first steering controller including a first inverter, a first locking circuit connected to the first inverter, and a first gate driver controlling driving of the first inverter, and a second steering controller including a second inverter, a second locking circuit connected to the second inverter, and a second gate driver controlling driving of the second inverter. If the first steering controller operates normally, the first steering controller may transmit a second lock disable signal for inactivating the second locking circuit, included in the first steering controller, to the second steering controller.

An auxiliary power supply apparatus is disposed on a power supply path from a main power supply apparatus to an electric power steering apparatus. The auxiliary power supply apparatus includes an auxiliary power supply that is a rechargeable power storage device, an on-off switch that is configured to selectively disconnect or connect the electric power steering apparatus and the auxiliary power supply from or to the main power supply apparatus, and an operation unit that is configured to operate the on-off switch. The operation unit is configured to switch the on-off switch from an ON state to an OFF state on a condition that a voltage supplied to the auxiliary power supply apparatus from the main power supply apparatus is less than or equal to a specified voltage reduction determination value and a vehicle speed is greater than a specified low vehicle speed determination value.

The present invention relates to an electronic control unit and a method for compensating for a torque steer. The electronic control unit includes: a driving torque calculation unit that calculates a drive shaft driving torque value, which is a torque value transmitted from an engine to a drive shaft; a torque steer degree calculation unit that calculates the actual driving torque value of a vehicle based on the drive shaft driving torque value, and calculates a torque steer degree by using the actual driving torque value; a compensation current calculation unit that calculates a torque steer compensation current value that compensates for the torque steer using the torque steer degree; a direction compensation unit that calculates a direction compensation current value according to a travelling direction of the vehicle; and a motor driving control unit that calculates a basic control current value using a steering angle and a steering torque value, calculates the final control current value by adding the torque steer compensation current value and the direction compensation current value to the basic control current value, and generates a control current according to the final control current value in order to supply the control current value to an electric motor.

A drive control unit in which a drive control system for a motor is made redundant so that a motor having two coil sets is individually driven and controlled for each coil set includes an inverter substrate on which a first inverter circuit that drives each coil of a first coil set, and a second inverter circuit that drives each coil of a second coil set are formed; a control substrate on which a first control circuit that includes a microcomputer which controls the first inverter circuit, and a second control circuit that includes a microcomputer which controls the second inverter circuit are formed; and a housing in which the inverter substrate and the control substrate are arranged in parallel to each other. The first control circuit is positioned on the front surface side, and the second control circuit is positioned on the rear surface side of the control substrate.

A current detection device includes a current detection unit configured to detect current flowing through a switching element of a lower-side arm; a correction value calculation unit configured to calculate an offset correction value, based on a detection value of the current detected by the current detection unit in a period during which the switching element off during PWM control, and to hold and update the calculated offset correction value; and a correction unit configured to correct, by the offset correction value held by the correction value calculation unit, the detection value of the current detected by the current detection unit in a period during which the switching element is on. The correction value calculation unit is configured to not update the offset correction value in a case where a duty ratio of the PWM control is equal to or less than a duty ratio lower limit value.

A current detection device includes a current detection unit configured to detect current flowing through a switching element of a lower-side arm; a correction value calculation unit configured to calculate an offset correction value, based on a detection value of the current detected by the current detection unit in a period during which the switching element off during PWM control, and to hold and update the calculated offset correction value; and a correction unit configured to correct, by the offset correction value held by the correction value calculation unit, the detection value of the current detected by the current detection unit in a period during which the switching element is on. The correction value calculation unit is configured to not update the offset correction value in a case where a duty ratio of the PWM control is equal to or less than a duty ratio lower limit value.