Abstract: Provided is an electric power steering device including: a motor; a drive device that supplies the motor with three-phase alternating current electric power; and a control device that controls the drive device, in which the control device is connected to a first power supply path that supplies power to the control device not via an ignition switch and a second power supply path that supplies power to the control device via the ignition switch, and the control device, in a case of detecting a failing of the first power supply path, operates with power supplied from the second power supply path and makes the motor generate an electromagnetic brake.

Abstract: A redundant communication system includes a first control device which calculates a control command value of an electric power device, and outputs first and second command signals; a second control device which controls the electric power device on the basis of one of the first and second control command values; and primary and secondary communication lines for respectively transmitting the first and second command signals to the second control device. The second control device comprises: a primary communication line abnormality determining unit which determines that the primary communication line is abnormal when a non-reception state or an abnormality state of the first command signal continues during a predetermined period; and a control command value switching unit which selects one of the first and second control command values in a switching manner and switches the selection from the first to the second control command value within the predetermined period.

Abstract: A method protects a battery in a fuel cell vehicle, in which an inverter-driven motor is supplied with electric power from the battery and a fuel cell. If a battery voltage of the battery falls outside of a prescribed range, a primary current and a secondary current that flow through the DC/DC converter, or currents in branch paths that correspond to the primary current and the secondary current, are reduced in order to limit a charging current flowing into the battery or a discharging current flowing from the battery.

Abstract: A triangular-wave current flows through a reactor of a DC/DC converter for converting voltages between increased and reduced levels. Surges are reduced, which are developed in an output voltage serving as a control voltage when the triangular-wave current changes across a zero value at which the current direction is changed. When a primary current flowing through the reactor changes across 0 [A] (zero value) at which the direction is changed, within an adjustment range, a feedback coefficient by which to multiply the error between the control voltage and a target voltage is multiplied by k (k>1) so as to increase a feedback amount. Surges developed in the control voltage due to a dead time when the primary current changes across 0 [A] are reduced.

Abstract: When a DC/DC converter switches between a primary voltage control mode, a secondary voltage control mode, and a current limiting mode as operation modes, an I-term resetting processor outputs an I term depending on the duty ratio in the operation mode before being switched to a PID processor. The PID processor performs a PID control process based on the input I term. A drive duty ratio setter outputs a drive duty ratio immediately after the control mode switching, which is substantially equal to the duty ratio in the operation mode before being switched. As a result, the duty ratios in the operation mode before being switched and the operation mode after being switched are made continuous with respect to each other.

Abstract: A controller is capable of executing direct couple control that directly couples a first power device and a second power device without causing a DC/DC converter to convert voltage. During the direct couple control, a drive signal that causes no voltage conversion is intermittently output to at least one of a plurality of switching devices.

Abstract: A fuel cell vehicle has a motor driven by an inverter and hybrid DC power supplies including a battery and a fuel cell for supplying electric power to the motor. For preventing a fuse connected to the battery from being blown out, when a motor current Im increases, a first source current flowing from the battery is limited to a range for not blowing out the fuse, and a generated current is increased as much as the first source current is limited.

Abstract: A redundant communication system includes: a first control device which calculates a control command value of an electric power device equipped in a vehicle, and outputs first and second command signals respectively corresponding to the control command value; a second control device which controls the electric power device on the basis of one of first and second control command values respectively corresponding to the first and the second command signals received from the first control device; a primary communication line which transmits the first command signal from the first control device to the second control device; and a secondary communication line which transmits the second command signal from the first control device to the second control device, wherein the second control device comprises: a primary communication line abnormality determining unit which determines that the primary communication line is abnormal, when a non-reception state of the first command signal or an abnormality state of the fir

Abstract: A triangular-wave current flows through a reactor of a DC/DC converter for converting voltages between increased and reduced levels. Surges are reduced, which are developed in an output voltage serving as a control voltage when the triangular-wave current changes across a zero value at which the current direction is changed. When a primary current flowing through the reactor changes across 0 [A] (zero value) at which the direction is changed, within an adjustment range, a feedback coefficient by which to multiply the error between the control voltage and a target voltage is multiplied by k (k>1) so as to increase a feedback amount. Surges developed in the control voltage due to a dead time when the primary current changes across 0 [A] are reduced.

Abstract: A controller is capable of executing direct couple control that directly couples a first power device and a second power device without causing a DC/DC converter to convert voltage. During the direct couple control, a drive signal that causes no voltage conversion is intermittently output to at least one of a plurality of switching devices.

Abstract: A method protects a battery in a fuel cell vehicle, in which an inverter-driven motor is supplied with electric power from the battery and a fuel cell. If a battery voltage of the battery falls outside of a prescribed range, a primary current and a secondary current that flow through the DC/DC converter, or currents in branch paths that correspond to the primary current and the secondary current, are reduced in order to limit a charging current flowing into the battery or a discharging current flowing from the battery.

Abstract: When a DC/DC converter switches between a primary voltage control mode, a secondary voltage control mode, and a current limiting mode as operation modes, an I-term resetting processor outputs an I term depending on the duty ratio in the operation mode before being switched to a PID processor. The PID processor performs a PID control process based on the input I term. A drive duty ratio setter outputs a drive duty ratio immediately after the control mode switching, which is substantially equal to the duty ratio in the operation mode before being switched. As a result, the duty ratios in the operation mode before being switched and the operation mode after being switched are made continuous with respect to each other.

Abstract: A fuel cell vehicle has a motor driven by an inverter and hybrid DC power supplies including a battery and a fuel cell for supplying electric power to the motor. For preventing a fuse connected to the battery from being blown out, when a motor current Im increases, a first source current flowing from the battery is limited to a range for not blowing out the fuse, and a generated current is increased as much as the first source current is limited.