A vehicle drive device that includes a body case that accommodates at least the rotary electric machine; an inverter case joined to the body case; and an inverter case cover joined to the inverter case; wherein an inverter housing that accommodates the inverter device is formed in a space enclosed by at least the inverter case; wherein a connection terminal electrically connecting the rotary electric machine and the inverter device is disposed in the inverter housing; wherein the case outer wall is formed by a first outer wall, a second outer wall, and the inverter case cover, the first outer wall being an outer wall of the body case, the second outer wall being an outer wall of the inverter case; and wherein a supply port and a discharge port for liquid refrigerant for cooling the inverter device are formed on the second outer wall.

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 at the current temperature. A method adjusts the direct component of the winding current such that the requested torque is delivered efficiently. For a given rotor speed, bus voltage, and torque, the direct component increases as the temperature increases.

A power system for a locomotive. The power system includes an alternator, a first inverter system, a traction motor, a second inverter system and an auxiliary power unit. The first inverter system is coupled to the alternator and receives high voltage power from the alternator. The traction motor is coupled to the first inverter system receives high voltage power from the first inverter system. The second inverter system is also coupled to the alternator. The second inverter system steps down the high voltage power from the alternator. The auxiliary power unit is coupled to the second inverter system and receives the stepped down voltage power from the second inverter system.

A mobile diesel generator and propulsion system preferably includes a diesel engine, a vehicle platform, a generator with voltage inverter, a battery charging system, at least one storage battery, an AC voltage to DC voltage converter, a motor controller and an AC motor. The generator with voltage inverter is driven by the diesel engine. The battery charging system receives AC voltage from the generator with voltage inverter and outputs a DC voltage to charge the at least one storage battery. The AC voltage to DC voltage converter receives output from the generator with voltage inverter and outputs a DC voltage to the motor controller. The motor controller receives DC voltage output from either the AC voltage to DC voltage converter or the at least one storage battery and outputs AC voltage to the AC voltage motor. The AC voltage motor drives a rear wheel of the vehicle platform.

A hybrid drive train for a self propelled power trowel includes a frame having a centerline from front to rear, an engine-generator set, a pair of rotors with trowel blades tiltably connected to the frame and positioned to support the frame above a concrete surface being finished, electric motors for driving the rotors, means for tilting each rotor toward and away from the centerline, and means for tilting a rotor fore and aft, parallel to the centerline. A rectifier and inverter in series at the engine-generator output allows engine speed to be regulated by a capacitor bank, and usage of highly efficient brushless AC synchronous motors to drive the rotors. A rechargeable battery may be connected in parallel with the capacitor bank.

A hybrid vehicle includes an isolation switch disposed between a first bus that is electrically coupled to a starter for an engine and a second bus that is electrically coupled to a power converter and accessory loads. The hybrid vehicle includes a controller programmed to normally command the switch closed, and, in response to expiration of a predetermined time interval without starting the engine, command the switch to open for a predetermined duration to perform diagnostics on the isolation switch.

A vehicle system in a hybrid vehicle comprises a controller configured to generate for output a modulated voltage to a direct current capacitor to prevent voltage spikes on the capacitor in response to receiving a reference current via a direct current voltage clamping control block that outputs a reference current in response to a difference between a feedback voltage and a reference voltage exceeding a threshold.

The present invention minimizes system loss during execution of intermittent boosting. A boost converter control apparatus has: a target value setting device for setting a target value of output voltage that minimizes a loss of a power supply system including a DC power supply, a boost converter, and a loading apparatus; an intermittent controlling device for executing an intermittent process of boost control in such a manner that the output voltage is maintained in a range including the set target value; an average value calculating device for calculating an average value of the output voltage in an execution period of the intermittent process; and a target value correcting device for correcting the set target value to reduce a deviation between the calculated average value and the set target value.

In an apparatus for controlling switching operations of switching elements of a power converter to convert input power to output power, a drive controller is configured to generate a drive control instruction indicative of predetermined switching operations of the switching elements, and output the drive control instruction. A driver is configured to drive, in accordance with the drive control instruction, the switching elements, so that the switching elements perform the predetermined switching operations. A switching speed adjuster is configured to obtain at least information indicative of atmospheric pressure, and adjust a switching speed of each of the switching elements such that the switching speed of the corresponding switching element decreases with a decrease of the atmospheric pressure.

A system is disclosed for connecting a battery string to a direct-current (DC) bus of a vehicle. The system may include a pre-charge circuit coupled between the battery string and the DC bus. The pre-charge circuit may include a first transistor. The system may also include a first contactor connected to the pre-charge circuit in series. The system may further include a controller configured to close the first contactor and switch on the first transistor.