A fuel cell system includes: a fuel cell; a temperature acquisition unit that acquires a temperature at a specific position in a vehicle equipped with the fuel cell system; a purge unit that purges the fuel cell when an operation of the fuel cell is stopped; and a control unit that acquires the temperature at the specific position from the temperature acquisition unit at least once from when the fuel cell system is stopped until the fuel cell system is started again, and uses the temperature at the specific position to determine whether purging at a stop by the purge unit is necessary when the fuel cell system is stopped next.

Provide is a fuel cell system capable of controlling the timing of a water removal process to suppress users' uncomfortableness. A fuel cell system with which a vehicle is equipped includes: a fuel cell; a water removal process gas supply part; a current location information acquisition part; a destination information acquisition part; and a water removal process control part, wherein the water removal process control part changes a state thereof to a water removal process allowed state if at least one of predetermined conditions is satisfied, the water removal process control part performs the water removal process if the distance from the current location to the destination is at a second threshold or under in the water removal process allowed state, and the water removal process control part sets the state thereof in a water removal process prohibited state after performing the water removal process.

A drive module for an electric vehicle having noise, vibration, and harshness counter measures. The drive module includes multiple covers and mass dampeners in order to detune vibration and noise from the cabin of the vehicle.

A vehicle includes an engine, an electric machine, a battery, and at least one controller. The vehicle may further comprise a port for supplying power to a load external to the vehicle. The controller is programmed to operate the engine at a power level based on a difference between a battery voltage and a reference voltage such that a power output by the electric machine reduces the difference. The power level may define an engine operating point that minimizes fuel consumption. The operating point may be an engine torque and an engine speed. The power level may be further based on a state of charge of the battery. The electric machine may be operated to cause the engine to rotate at an engine speed corresponding to the selected power level. The difference may be caused by varying power drawn by a load external to the vehicle.

A louver structure is provided that reduces noise propagated to a compartment of a vehicle. The louver structure includes: a cooling fan configured to cool a battery; a back wall configured to separate the cooling fan from a compartment and having an air inlet to communicate with the cooling fan; and a louver member attached to the back wall and covering the air inlet. The louver member is provided with a labyrinth structure.

The invention relates to a method for controlling an inverter which is electrically connected to an electric motor, having the following steps: defining a modulated voltage (S1) for the inverter, said voltage being based on a first switching frequency, for operating the electric motor with a current, wherein the current has an electric frequency; determining the electric frequency (S2); changing the first switching frequency (S4) on which the modulated voltage is based to a second switching frequency if a value pair consisting of electric frequency and first switching frequency, or a value pair consisting of electric frequency and a sideband of the first switching frequency, is within at least one defined disturbance range (S3).

The invention relates to a drive unit (10) for an electric vehicle, said drive unit comprising an electric motor (20), a transmission (30), a power electronics unit (40) for controlling the electric motor (20), and an acceleration sensor (50). The acceleration sensor (50) is located in a housing (42) of the power electronics unit (40), and the housing (42) of the power electronics units (40) is mechanically coupled to the electric motor (20) and/or to the transmission (30) such that vibrations generated by the electric motor (20) and/or by the transmission (30) are transmitted to the acceleration sensor (50) located in the housing (42) of the power electronics unit (40), said acceleration sensor being designed to pick up the transmitted vibrations and convert said vibrations into a measurement signal. The drive unit (10) comprises a signal processing unit which is designed to generate an order spectrogram from the measurement signal and from the speed of the electric motor (20). The invention also relates to a method for detecting faults in a drive unit (10) according to the invention, wherein vibrations which are generated by the electric motor (20) and/or by the transmission (30) are picked up by the acceleration sensor (50) and converted into a measurement signal, an order spectrogram is generated from the measurement signal and from the speed of the electric motor (20) using a signal processing unit, at least one level of the order spectrogram for at least one order is compared using a comparison unit with a threshold value assigned to said order, and a fault in the drive unit (10) is detected if the at least one level of the order spectrogram exceeds the threshold value assigned to said order.

The application relates to an electrical vehicle charging system for charging an electrical vehicle with a DC current, including a charger, an air conditioning device and a control device, whereby the charger is configured for delivering the DC current to the electrical vehicle, the air conditioning device is configured for heating and/or cooling the charging system, the air conditioning device and/or the charger emits a noise, and the control device is configured for controlling delivery of the DC current according to the noise.

A hybrid air mobility vehicle can make a long-distance flight through an efficient operation of an engine and a battery, and can reduce discomfort by reducing noise according to flight surroundings. The hybrid air mobility vehicle includes: an engine and a generator; a battery and a drive motor electrically connected to the generator; a first propeller connected to the drive motor and a second propeller connected to the generator through a clutch; and a controller that controls driving of the engine, the clutch, and the drive motor, based on a flight factor including at least one of a flight mode, a required power, a battery charging amount, or a surrounding flight environment of the hybrid air mobility vehicle.

A method for controlling operation of a rotary electric machine includes receiving, via a bandwidth-partitioning harmonic compensation regulator (HCR) of a controller, a commanded torque and rotational speed of the electric machine, and calculating, via the HCR in response to enabling conditions, a dq harmonic compensation current and a dq harmonic compensation voltage for one or more predetermined harmonic orders using the commanded torque and the rotational speed. The harmonic compensation current and voltage cancel torque ripple and current ripple in the one or more predetermined harmonic orders. The method may include injecting an acoustic tone at a predetermined harmonic order. The method additionally includes adding the dq harmonic compensation current and voltage to a dq current and voltage command, respectively, to generate adjusted dq current and voltage commands. The electric machine is then controlled using the adjusted dq current and voltage commands.