A vehicle braking control system includes a vehicle microphone, two front wheels and two rear wheels of a vehicle, two front brakes and two rear brakes, and an electronic brake pressure control module configured to selectively control an amount of brake pressure applied to the front brakes and the rear brakes. The vehicle control module is configured to detect, via the at least one vehicle microphone, a brake noise value in response to brake pressure applied to the front brakes and the rear brakes, determine whether the brake noise value exceeds a specified brake noise threshold, identify which of the front brakes and the rear brakes are generating a greater noise value in response to the brake noise value exceeding the specified brake noise threshold, and reduce brake pressure applied to the identified one of the front brakes and the rear brakes.

A driving device includes a motor, an inverter configured to drive the motor by switching a plurality of switching elements, and an electronic control unit configured to set voltage commands of phases according to temporary voltage commands of the phases based on a torque command of the motor and perform switching control of the switching elements by generating PWM signals for the switching elements by using the voltage commands of the phases and a carrier voltage. The electronic control unit is configured to switch a method of setting the voltage commands between a first method and a second method for each irregular time interval. The first method is a method of setting the voltage commands without superposing harmonics to the temporary voltage commands, and the second method is a method of setting the voltage commands by superposing the harmonics to the temporary voltage command.

Charging control systems and methods are provided for controlling noise emission levels when charging an electrified vehicle. The nose emission levels may be controlled based on one or more user-defined rules associated with a custom quiet zone. The charging control systems may include one or more user interfaces designed to allow users to establish the user-defined rules which bound the custom quiet zone.

When a calibration starting condition of a pressure sensor is satisfied while a fuel cell vehicle is traveling, the fuel cell vehicle starts to travel by using electric power supplied from a secondary battery. In the fuel cell vehicle, a pressure sensor is calibrated based on hydrogen pressure in a hydrogen gas flow channel downstream of a pressure reducing valve after a shut-off valve of a hydrogen tank is closed, and the hydrogen in a hydrogen gas flow channel is exhausted until hydrogen pressure upstream of the pressure reducing valve and hydrogen pressure downstream of the pressure reducing valve become substantially equal to each other. The fuel cell vehicle travels by using electric power supplied from the secondary battery while the pressure sensor is being calibrated, so that calibration processing of the pressure sensor can be performed without causing a noise.

A motor drive control device is capable of reducing gear rattling noise generated in a speed reducer without increasing size of the speed reducer and the number of components. A motor ECU controls a motor to generate a reverse set torque (Tn) when a target torque (T*) is reversed (at a time t1). The motor ECU sequentially calculates a backlash (B) in a counter gear mechanism, and sets a time period (D1) in which the reverse set torque (Tn) is generated by the motor and a time period (D2) in which a return set torque (Tp) is generated by the motor so that the backlash (B) at a current time becomes equal to a time integrated value (corresponding to an area A) of an estimated relative velocity (V2V1) until a time of re-abutment.

An electric power adjustment system includes a fuel cell connected to a load, and a multi-phase converter connected between the fuel cell and the load. The multi-phase converter is constituted of a plurality of phases and converts an output voltage from the fuel cell by a predetermined required voltage ratio. The electric power adjustment system includes a ripple current characteristic switching unit configured to switch a ripple current characteristic with respect to an input current to the multi-phase converter by changing at least one of a drive phase number and the voltage ratio of the multi-phase converter according to an operation state of the fuel cell and a required electric power of the load.

This application provides a powertrain, a control method for a motor controller, and an electric vehicle. The powertrain includes a motor controller and a drive motor, the motor controller includes three bridge arms connected in parallel, and a bridge arm midpoint of one of the three bridge arms is configured to connect to the other end of the direct current power supply. In response to that the direct current power supply switches from outputting a direct current to stopping outputting the direct current, an upper bridge arm switching transistor of one bridge arm of the other two bridge arms of the three bridge arms is turned on and a lower bridge arm switching transistor of the other bridge arm of the other two bridge arms is turned on. The power battery is configured to supply power to one phase winding and another phase winding, to reduce slipping sound.

A device for controlling vibrations generated by electric machines of a vehicle is provided. The vehicle includes a first electric machine unit for driving a first wheel and a second electric machine unit for driving a second wheel. The device is configured to operate the first electric machine unit depending on a first torque to be applied to the first wheel and to operate the second electric machine unit depending on a second torque to be applied to the second wheel. Furthermore, the device is configured to operate the first electric machine unit and the second electric machine unit in a manner coordinated to one another such that predefined target vibrations can be generated as a result of the superimposition of first vibrations caused by the operation of the first electric machine unit and second vibrations caused by the operation of the second electric machine unit.

A motor drive control device is capable of reducing gear rattling noise generated in a speed reducer without increasing size of the speed reducer and the number of components. A motor ECU controls a motor to generate a reverse set torque (Tn) when a target torque (T*) is reversed (at a time t1). The motor ECU sequentially calculates a backlash (B) in a counter gear mechanism, and sets a time period (D1) in which the reverse set torque (Tn) is generated by the motor and a time period (D2) in which a return set torque (Tp) is generated by the motor so that the backlash (B) at a current time becomes equal to a time integrated value (corresponding to an area A) of an estimated relative velocity (V2V1) until a time of reabutment.

A vehicle braking control system includes a vehicle microphone, two front wheels and two rear wheels of a vehicle, two front brakes and two rear brakes, and an electronic brake pressure control module configured to selectively control an amount of brake pressure applied to the front brakes and the rear brakes. The vehicle control module is configured to detect, via the at least one vehicle microphone, a brake noise value in response to brake pressure applied to the front brakes and the rear brakes, determine whether the brake noise value exceeds a specified brake noise threshold, identify which of the front brakes and the rear brakes are generating a greater noise value in response to the brake noise value exceeding the specified brake noise threshold, and reduce brake pressure applied to the identified one of the front brakes and the rear brakes.