A method of controlling a hybrid vehicle includes commanding a first electric machine to provide a compensating torque. The compensating torque is based on a calculated cylinder pressure. The calculated cylinder pressure is calculated using a dynamic model. The model has an initializing input of engine crank position and real-time inputs of measured speed of the first electric machine and measured speed of the second electric machine.

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.

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.

Systems and methods are described for mitigating vehicle vibration through the control of a variable spring absorber that is part of a powertrain that includes the engine. In some such embodiments, an absorption frequency of the variable spring absorber is tuned in a feed forward manner based at least in part on the current engine speed and a factor indicative of the minimum repeating firing sequence cycle length associated with the current effective firing fraction (which in many implementations may be the denominator of the firing fraction).

Systems and methods for improving operation of a hybrid vehicle are presented. In one example, compensation is provided for a dual mass flywheel positioned in a vehicle driveline. The approaches may reduce driveline torque disturbances.

An engine starting system for hybrid vehicle is provided. The engine starting system is applied to a hybrid vehicle in which a friction clutch is disposed between an engine and a power distribution device. In order to reduce gear noise and vibrations, a second motor establishes a cancel torque to cancel a reaction torque acting on an axle when starting the engine. The engine starting system is configured to increase the torque of the second motor in a direction of a drive torque rotating the axle, when starting the engine while bringing the friction clutch into engagement in a slipping manner.

A controller controls an electric motor such that a pulsation compensation torque corresponding to a pulsation component of a torque of an internal combustion engine, which appears in a drive shaft, is supplied to the drive shaft as a damping torque for suppressing vibrations of a hybrid vehicle. A determination is made as to whether a torque of the electric motor, excluding the pulsation compensation torque, is smaller than a predetermined value. When it is determined that the torque excluding the pulsation compensation torque is smaller than the predetermined value, the controller selects one mode having a highest energy efficiency of the hybrid vehicle from among a plurality of modes, and controls the internal combustion engine and the electric motor based on the selected mode.

A control apparatus of a hybrid vehicle has an abnormal sound generation condition determination unit that determines whether or not a drive state of the hybrid vehicle satisfies an abnormal sound generation condition of a gear train, and a pressing processor that executes a pressing process to apply a pressing torque to suppress generation of abnormal sound from a first rotary electric machine to the gear train of a transmission mechanism when the abnormal sound generation condition is satisfied and to not apply the pressing torque when the abnormal sound generation condition is not satisfied. A pressing torque setting unit sets a pressing torque to be applied by the first rotary electric machine to a torque in a direction to suppress an engine cam torque that may rotate an engine output shaft during a period in which the engine is stopped.

An engine system for a vehicle may include an engine including a plurality of cylinders connected to a crankshaft, a Cylinder Deactivation (CDA) apparatus provided to at least one cylinder among the plurality of cylinders of the engine, a first flywheel mounted on the crankshaft, a second flywheel having a rotation center formed eccentrically with respect to the crankshaft by being disposed at a position corresponding to the cylinder including the CDA apparatus, and a clutch provided to the crankshaft to selectively transmit a torque of the crankshaft to the second flywheel during operation of the CDA apparatus.

The first fastening member, to which the engine-side end of the plate part that fixes a part of the power control device, is fastened is connected to the first wall part of the case body. In addition, the connection part between the housing to which the engine block is connected and the first wall part and the connection part between the first fastening member and the first wall part are located at positions facing each other with the first wall part interposed between the connection parts. Thus, the rigidity of the connection part between the housing and the case body is improved, bending of the case body starting from the connection part is suppressed, and vibration of the electromechanical integration unit is suppressed. Therefore, deterioration of NV in the electromechanical integration unit is able to be suppressed.