Abstract: A driving torque command generating apparatus and method of operating a hybrid electric vehicle can obtain torsional state observation values using an engine speed, a motor speed, and a wheel speed detected by an engine speed detector, a motor speed detector, and a wheel speed detector, respectively, together with a motor torque command generated in a previous period, and generate an engine torque command and a motor torque command of a driving torque command based on a driving input value input by a driving input detector and the torsional state observation values.

Abstract: A system and method for estimating a wheel speed of a vehicle are provided. The system includes wheel speed sensor that detects a rotation speed of a wheel of a vehicle and a motor speed sensor that detects a speed of the driving motor. A controller receives a signal of the wheel speed sensor, a signal of the motor speed sensor, and information regarding a gear stage indicating current gear stage status of the transmission, and estimates a wheel speed including direction information of wheel rotation.

Abstract: Disclosed are a method of and an apparatus for controlling a vibration of a hybrid electric vehicle. An apparatus for controlling a vibration of a hybrid electric vehicle may include: an engine position detector detecting a position of an engine; an air amount detector detecting an air amount flowing into the engine; an accelerator pedal position detector detecting a position of an accelerator pedal; a vehicle speed detector detecting a speed of the hybrid electric vehicle; and a controller. The controller controls operation of a motor based on the position of the engine, the air amount, the position of the accelerator pedal, and the speed of the hybrid electric vehicle.

Abstract: A system and method for estimating a wheel speed of a vehicle are provided. The system includes a wheel speed sensor that detects a rotation speed of a wheel of the vehicle and a longitudinal acceleration sensor that detects a longitudinal acceleration of the vehicle. A controller converts the longitudinal acceleration to a wheel acceleration, compensates for the converted wheel acceleration based on a compensation value obtained using wheel speed information, integrates the compensated wheel acceleration, and calculates a wheel speed estimation value based on the integrated wheel acceleration.

Abstract: The present disclosure provides a method of determining an optimal operating point of a hybrid electric vehicle. The method includes: determining demand torque, comparing the demand torque and an engine torque reference value obtained from an optimal operating line to determine a determined mode where the determined mode is a charging mode or a discharging mode, determining a plurality of candidate points comprising a combination of an engine operating point satisfying the demand torque and a motor operating point corresponding to the engine operating point in the determined mode, calculating system efficiency during charging using charging efficiency of each candidate point of the plurality of candidate points and discharging efficiency during previous driving when the determined mode is a charging mode, and determining a candidate point with highest system efficiency during charging as an optimal operating point.

Abstract: A power train apparatus may include an engine including a crankshaft and an engine block, a motor housing connected to the engine block and of which a housing opening is formed, a rotor portion connected to the crankshaft through the housing opening, of which a magnet is connected to a first side thereof and the rotor portion to which a balance portion is formed for compensating for imbalance rotational energy transmitted from the crankshaft; a stator portion disposed between the rotor portion and the motor housing and connected to the motor housing and a transmission connected to the engine block.

Abstract: A power train may include an engine having a crankshaft and an engine block, a motor housing connected to the engine block and of which a housing hole is formed, a rotor portion connected to the crankshaft through the housing hole and of which a magnet is connected to a first side thereof, a stator portion disposed between the rotor portion and the motor housing, connected to the motor housing and including a coil corresponding to the rotor portion, a transmission connected to the engine block and a clutch selectively transmitting rotation of the rotor portion to the transmission.

Abstract: An apparatus for reducing vibrations of a two-cylinder engine for a hybrid electric vehicle includes a reference signal generator for generating a first reference signal and a first reference phase, a speed calculator for calculating a speed of the motor based on the position of the motor, a vibration extractor for extracting a first vibration signal based on the speed of the motor, a variable filter, a filter coefficient updater, a phase calculator, a phase shift compensator, a synchronization signal generator for generating a first synchronization signal synchronized with the first vibration signal based on a first reference phase transferred from the reference signal generator, the second phase difference transferred from the phase calculator and the first compensation value transferred from the phase shift compensator, an inverse phase signal generator, and a torque generator for generating a final command torque based on the first inverse phase signal.

Abstract: A driving torque command generating apparatus and method of an eco-friendly vehicle are provided. The apparatus and method obtain rapid reaction and response of the vehicle in response to a driving input while effectively reducing NVH problems caused by torsion and backlash of a drive system even during a significant change in driving force caused by the driving input. Torsional state information of a vehicle drive system is obtained from input information regarding a motor speed and a wheel speed detected by a motor speed detector and a wheel speed detector. A motor torque command is generated based on a driving input value input by a driving input value detector and the obtained torsional state information.

Abstract: A driving torque command generating apparatus of a vehicle may include: a driving input sensor configured to detect a driving input value of a driver, including a pedal input value, in response to a manipulation of an accelerator pedal of the vehicle; a motor speed sensor configured to detect a motor speed of a drive motor of the vehicle; a wheel speed sensor configured to detect a wheel speed of a wheel of the vehicle; and a controller configured to obtain torsional state observation value information, which indicates a torsional state observation value derived from a vehicle drive system of the vehicle, according to the detected motor speed, the detected wheel speed, and a previously-generated motor torque command, and to generate a motor torque command based on the detected driving input value and the obtained torsional state observation value information.

Abstract: An apparatus for active vibration control of a hybrid electric vehicle including an engine and a motor is disclosed. The apparatus includes: a position sensor to detect position information of the engine or the motor; and a controller to select a reference angle signal based on a signal from the position sensor. The controller performs fast Fourier transform (FFT) analysis by generating a reference angle, extracts a vibration component of each frequency through the FFT analysis, generates a reference signal by performing inverse FFT, and performs active vibration control of each frequency by reflecting a basic amplitude ratio, an adjustable rate according to an engine load, and an engine torque to the reference signal.

Abstract: An auto cruise control method and system for hybrid electric vehicles are provided. Particularly, a PnG driving pattern in consideration of characteristics of hybrid electric vehicles is applied to maximize improvement in fuel efficiency and to satisfy both drivability and improvement in fuel efficiency. The auto cruise control method includes turning on an auto cruise control mode by receiving a user set target vehicle speed using an engine and a driving motor as vehicle driving sources, and turning on a pulse and glide (PnG) mode. A user interface (UI) device is provided to receive a selection of any one of a PnG coast mode, a PnG glide mode and a PnG constant-speed cruise mode, and, when the driver selects one mode through the UI device, the hybrid electric vehicle is operated in the selected mode.

Abstract: Disclosed are a method of and an apparatus for controlling a vibration of a hybrid electric vehicle. An apparatus of controlling a vibration of a hybrid electric vehicle disclosure may include: an engine position detector detecting a position of an engine; an air amount detector detecting an air amount flowing into the engine; an accelerator pedal position detector detecting a position of an accelerator pedal; a vehicle speed detector detecting a speed of the hybrid electric vehicle; an SOC detector detecting a state of charge (SOC) of a battery; and a controller. The controller controls the operation of a motor based of the position of the engine, the air amount, the position of the accelerator pedal, the speed of the hybrid electric vehicle, and the SOC of the battery.

Abstract: Disclosed are a method of and an apparatus for controlling a vibration of a hybrid electric vehicle. An apparatus for controlling a vibration of a hybrid electric vehicle may include: an engine position detector detecting a position of an engine; an air amount detector detecting an air amount flowing into the engine; an accelerator pedal position detector detecting a position of an accelerator pedal; a vehicle speed detector detecting a speed of the hybrid electric vehicle; and a controller. The controller controls operation of a motor based on the position of the engine, the air amount, the position of the accelerator pedal, and the speed of the hybrid electric vehicle.

Abstract: The present disclosure provides an apparatus for controlling distribution of torque of front and rear wheel of a four-wheel drive (4WD) vehicle, including: a slip control torque calculator configured to calculate slip control torque of the rear wheels from information collected from the vehicle during driving in a 4WD mode; a handling control torque calculator configured to calculate handling control torque for the rear wheels from information collected from the vehicle during driving in the 4WD mode; a weighting factor determiner configured to determine a slip control weighting factor and a handling control weighting factor based on vehicle state information; and a target torque calculator configured to calculate target torque of rear wheel by summing the weighting factors applied to the slip control torque and handling control torque, respectively, wherein the target torque of the rear wheel is a target value of the torque distributed to the real wheel.

Abstract: An apparatus and method for accurately estimating the transfer torque of an engine clutch provided between an engine and a motor in a hybrid electric vehicle, may include a forward estimation device configured for determining a first estimate of engine clutch transfer torque using engine torque information, a reverse estimation device configured for determining a second estimate of the engine clutch transfer torque using a drive system model including wheels, a transmission, and a motor and using wheel speed information, a weight determination device configured for determining a weight based on brake input by a driver and whether predetermined devices in the vehicle are operated, and an estimate combination determination device configured for determining a final estimate of the engine clutch transfer torque as a value combined by applying a weight to the determined first estimate and the determined second estimate.

Abstract: A braking control system and a method for an eco-friendly vehicle are provided to resolve discrepancy in braking force occurring during switching between hydraulic braking and regenerative braking. The system includes a deceleration determiner that determines target and actual decelerations of the vehicle based on collected information when braking and a torque calculator that calculates target and actual deceleration torques from the determined target and actual decelerations of the vehicle using vehicle equivalent inertia information. An error calculator calculates a torque error and a torque corrector corrects a pre-correction target regenerative braking torque by the calculated torque error and calculates a post-correction target regenerative braking torque. A motor controller adjusts a regenerative braking torque of a motor according to the calculated post-correction target regenerative braking torque.

Abstract: A method for controlling gear shifting of a hybrid electric vehicle, which is configured for reducing gear-shifting time, minimizing loss by a drive system, improving fuel efficiency and enhancing drivability and which enables a driver to feel a change in acceleration when the driver manipulates the accelerator pedal during power-on upshift active control operation may include speed control of the driving source of the vehicle based on a change rate of a transmission input speed and feedforward control of the clutch of the engagement element in the transmission, to which a driver requested torque is reflected, which are performed at the same time during power-on upshift active control operation, facilitating the driver to feel a change in acceleration which is produced by his or her driving manipulation.

Abstract: The present disclosure relates to an apparatus and a method for active vibration control of a hybrid electric vehicle.

Abstract: The present disclosure relates to an apparatus and a method for active vibration control of a hybrid electric vehicle.