A method of disconnecting a secondary battery which disconnects the secondary battery from an electric power supply path in an electric power supply system performs shutting off a flow of a current to a secondary battery side through a converter after it is detected that there is an abnormality in the secondary battery, and when it is determined that the voltage of the power storage unit is equal to or less than the voltage of the secondary battery by the predetermined value, maintaining a connection of the secondary battery to the electric power supply path and when it is determined that the voltage of the power storage unit is greater than the voltage of the secondary battery by the predetermined value, operating a relay to disconnect the secondary battery from the electric power supply path.

A power supply system includes a first energy storage, a second energy storage, a power transmission circuit, and circuitry. The circuitry acquires a request supply amount, a request output amount, and failure detection information. The circuitry controls the power transmission circuit in accordance with the at least one of the request supply amount and the request output amount such that a ratio of an amount of electric power supplied from or to the first energy storage and an amount of electric power supplied from or to the second energy storage is to be a first ratio in a normal operating. The circuitry controls the power transmission circuit in accordance with the at least one of the request supply amount and the request output amount such that the ratio is to be a second ratio which is different from the first ration in a partial failure state.

A vehicle includes one or more inverter-fed electric machines such as permanent magnet synchronous motors. In response to a torque request, a controller issues commands to an inverter calculated to cause the motor to produce the requested torque. A method of operating the inverter may determine the commands based on the ratio of rotor speed to inverter input voltage, reducing the approximation error associated with multi-dimensional lookup tables. When the speed and voltage vary while maintaining a constant ratio and constant torque request, the issued commands produce a winding current in the electrical machine with constant direct and quadrature components.

The power supply system includes: a first power circuit having a first battery, a second power circuit having a second battery, a voltage converter which converts voltages between both circuits, voltage sensors which acquire a first circuit voltage value V1 and second circuit voltage value V2, a current sensor which acquires a passing current value Iact, and a passing power control unit which operates the voltage converter. The passing power control unit performs PWM control under a control duty ratio obtained by summing a correction duty ratio calculated based on the current deviation change rate and a base duty ratio, in a case of, after starting PWM control under the base duty ratio decided based on the voltage values V1, V2 during activation of the voltage converter, the value of current deviation between a passing current value Iact and activation target value Itrg exceeding a permitted range.

A power supply device includes first and second electric power lines, first and second boost converters, and an electronic control unit. The first and second electric power lines are connected to a load and a battery, respectively. The first and second boost converters each transfer electric power between the second and first electric power lines while changing a voltage of the electric power. The electronic control unit is configured to execute both-side driving when a temperature of the battery is equal to or more than a specified temperature and to execute one-side driving when the temperature is less than the specified temperature. The electronic control unit is configured to drive switching elements of the first and second boost converters with driving signals different in phase to execute the both-side driving, and to drive one of the first and second boost converters to execute the one-side driving.

An inverter includes an N-channel IGBT, with a freewheeling diode, coupled to a phase of an electric machine, and has a MOSFET coupling a local voltage with a gate of the IGBT and configured to transition from saturation to linear operation as a current flow direction through the diode switches from positive to negative while the IGBT initiates a current through the electric machine.

A vehicle including a powertrain system that includes an electric machine electrically connected to a power inverter is described, wherein the powertrain system is operative in an electric vehicle mode to generate propulsion torque. A method for controlling the powertrain system includes determining a vehicle speed, and determining a preferred audible sound to be generated by the powertrain system when operating in the electric vehicle mode at the vehicle speed. A control signal for the power inverter is determined, and is associated with operating the powertrain system in the electric vehicle mode at the vehicle speed. The preferred audible sound is incorporated into the control signal for the power inverter, and the power inverter is controlled to operate the electric machine employing the control signal and the preferred audible sound.

A vehicle includes: at least one rotary electric machine; an inverter that drives the rotary electric machine; a capacitor connected between a paired electric power lines that is connected to the inverter; and a control unit. When a vehicle collision is detected, the control unit executes first control for discharging electric charges stored in the capacitor by performing a switching operation of the inverter so as to prevent a flow of a q-axis current but cause a flow of a d-axis current to the rotary electric machine. The control unit stops the first control in a specified case and executes second control for performing the switching operation of the inverter so as to reduce the current flowing through the rotary electric machine to be lower than that during execution of the first control. The control unit executes third control for shutting down the inverter after execution of the second control.

A device for charging a battery, or a battery of an electric traction automotive vehicle, based on a three-phase or single-phase power supply network, including a filtering stage including a capacitive assembly and configured to be connected to the power supply network. The device includes a mechanism to monitor capacitive assembly and to detect a deviation in value of the capacitance of at least one capacitor of the capacitive assembly on the basis of voltages and currents measured across the input terminals of the filtering stage.

A vehicle includes front-wheels each of which is driven by a front-wheel driving motor having a first motor characteristic and a speed reducer, and rear wheels each of which is driven by a rear-wheel driving motor having a second motor characteristic. An ECU calculates a total target wheel torque of all the wheels, and calculates target wheel torques for the respective front wheels and the respective rear wheels based on the total target wheel torque, the first motor characteristic, the second motor characteristic, and a characteristic of the speed reducer. The ECU calculates a target motor torque for the front-wheel driving motor based on a speed reduction ratio of the speed reducer and the target wheel torque for each front wheel, and calculates a target motor torque for the rear-wheel driving motor based on the target wheel torque for each rear wheel.