A method for damping juddering in the drive train of a vehicle having an electric motor as the drive motor, and a vehicle having a closed-loop control system to carry out the method. The method includes calculating an electric motor setpoint torque for actuating the electric motor from an electric motor request torque which corresponds to a current request for a torque, and calculating a correction torque as a function of the electric motor request torque and a correction factor which is determined from a rotational speed of the electric motor.

A rotary drive system having a voltage source and an electric motor. The motor has a stator with independent phases and a rotor, an inverter designed to connect each phase to the voltage source in order to generate phase currents, and a device for controlling the inverter. The control device includes a unit for determining whether the fundamental frequency of the phase currents is lower than a frequency threshold equal to, at the most, 100 Hz, and a unit for generating a command, configured such that, when the fundamental frequency is determine as being lower than the frequency threshold, the command causes the appearance of a homopolar component in the phase currents.

Various disclosed embodiments include illustrative systems for performing hill stall/start assist functions. An illustrative drive unit controller receives a zero-speed command and electric motor information, generates a torque command based on the received zero-speed command and the electric motor information, and instructs a drive unit inverter for an electric motor in response to the generated torque command.

An electric drive system includes an energy storage system (ESS), a power conversion system, and an alternating current (AC) traction system. The ESS provides or receives electric power. The ESS includes a first energy storage unit and a second energy storage unit. The power conversion system is electrically coupled to the ESS for converting an input power to an output power. The AC traction system is electrically coupled to the power conversion system for converting the output power of the power conversion system to mechanical torques. The AC traction system includes a first AC drive device and a second AC drive device. An energy management system (EMS) is in electrical communication with the ESS, the AC traction system, and the power conversion system for providing control signals.

A method for controlling an electric motor is described herein. The method comprises setting a current limit, a speed limit and a torque limit. The method also comprises sensing a DC link current, comparing the sensed DC link current with the current limit and adjusting the torque limit based on the comparison with the current limit to provide an adjusted torque limit. The method also comprises sensing the speed of the electric motor, comparing the speed with the speed limit and further adjusting the adjusted torque limit based on the comparison with the speed limit.

A vehicle control apparatus includes an inverter, a torque setting unit that sets a first torque command value of a traveling motor based on an accelerator operation amount, a torque correction unit that corrects the first torque command value to a second torque command value by performing feedback of the result of control of the traveling motor to the first torque command value, an inverter control unit that generates a drive signal of switching elements based on the second torque command value and a carrier signal, and a motor lock determination unit. When the traveling motor is determined to be in the motor lock state by the motor lock determination unit, the torque correction unit sets a feedback gain to be smaller than a threshold gain, and the inverter control unit sets the frequency of the carrier signal to be lower than a threshold frequency.

A system for providing a movement assistance to an electric cycle is provided. The system includes circuitry communicatively coupled to an electronically-actuated driving mechanism and a sensor system of the electric cycle. The circuitry receives sensor information associated with the electric cycle through the sensor system and determines an inclination of the electric cycle with respect to an inclination-reference based on the received sensor information. The circuitry further determines occupancy information associated with a seat of the electric cycle based on the received sensor information. Based on the determined inclination and the determined occupancy information, the circuitry controls the electronically-actuated driving mechanism to drive at least one wheel of the electric cycle.

An anti-jerk control method for an electric vehicle incorporates an anti-jerk function that can be performed more accurately and effectively by utilizing a real-time weight change of an electric vehicle. The anti-jerk control method includes: estimating vehicle weight by a controller based on vehicle driving information collected from a vehicle; determining a required torque command of a driver by the controller based on the vehicle driving information collected from the vehicle; determining anti-jerk torque according to the vehicle weight based on calculated speed deviation and the estimated vehicle weight information; and controlling a drive motor according to a compensated motor torque command by compensating the required torque command with the anti-jerk torque in the controller.

An apparatus and a method for controlling pitch reduction may include a sensor device that measures a wheel speed and a longitudinal acceleration of a vehicle, a pitch rate estimation device that performs pseudo-integral of a difference between a wheel acceleration determined from the wheel speed and the longitudinal acceleration to determine an estimation value of a pitch rate, and a pitch motion reduction controller that generates a control command for implementing a motor torque in which the determined estimation value of the pitch rate is reflected and transmits the control command to an electric motor of the vehicle.

A control method for an electric four-wheel drive vehicle including a front drive source for driving a front wheel and a rear drive source for driving a rear wheel independently of the front wheel includes: acquiring a driving direction of the electric four-wheel drive vehicle based on an input state of a shift lever; acquiring an actual moving direction of the electric four-wheel drive vehicle; and when the driving direction and the moving direction are different from each other, setting a basic driving force for suppressing movement in the moving direction for the front wheel and the rear wheel, and driving one wheel of the front wheel and the rear wheel with a driving force smaller than the basic driving force by implementing a limit for setting an upper limit value for a driving force generated in the one wheel.