A method for vibration dampening of a drive train is disclosed. The method includes determining torsional parameters of the drive train via a state controller based on reconstructed torsional parameters of the at least one flywheel mass detected by at least one observer, determining the reconstructed torsional parameters based on disturbances in both (i) a load torque (M.sub.last) applied at an output of a torque transmission device and (ii) an induced torque (M.sub.ind) transmitted via the torque transmission device, determining a compensation torque via the state controller based on the reconstructed torsional parameters, and controlling an electric machine via the state controller based on the compensation torque to compensate torsional vibrations.

A control system for hybrid vehicles for reducing a shock caused by a change in an output torque of a transmission during a shifting operation of a transmission. In the hybrid vehicle, an engine and a first motor are connected to an input side of an automatic transmission, and a second motor is connected to an output side of the automatic transmission. A controller calculates a change in an output torque of the transmission when establishing a predetermined gear stage, based on a torque capacity of an engagement device to be engaged and an input torque to the transmission, and select one of the first motor and the second motor that requires less power to reduce the change in the output torque of the automatic transmission.

Methods and systems are provided for operating a high voltage generator coupled to a plug-in hybrid vehicle driven by a reciprocating piston engine. In one example, a method may include, predicting variations in output torque from the reciprocating piston engine and adjusting the driving torque required for the high voltage electric generator based upon the predicted torque variations.

Methods and systems for operating a hybrid vehicle having a first power source that uses a rechargeable battery and a second power source that uses a fuel. Preview information relating to upcoming road and traffic is used to generate a speed reference. A transmission torque reference is calculated using the speed reference and upcoming road information. A predictive power split plan is then determined by optimizing use of the first and second power sources to satisfy the transmission torque reference. At least a first sample of the predictive power split plan is then implemented.

Methods and systems for hybrid vehicle control. A high-level controller and a low-level controller are provided. The high-level controller uses preview information and a model of the low-level controller to calculate optimized tuning parameters for the low-level controller. The low-level controller uses driver inputs and current operating states to calculate optimized torque split for the hybrid engine.

A hybrid system includes a transmission control module, a power source, a transmission, and a drive train. The transmission control module partially operates the hybrid system and receives operating information from various components of the system, calculates power losses in the drive train, and calculates the driving torque needed to reach a target power profile determined from a driver's input.

A method of decoupling output torque from input torque during engine speed control of a hybrid powertrain for a vehicle comprises determining, via a controller, a virtual output torque required on an output member of a multi-mode transmission given a virtual input torque commanded on an input member of the multi-mode transmission for engine speed control in a selected mode of the multi-mode transmission such that rotational speed of the output member is unchanged to prevent undesired torque variation at the output member. The controller determines the virtual output torque via a first stored transfer function relating virtual output torque to virtual input torque based on modeled physical dynamics of the vehicle driveline for the selected mode of the multi-mode transmission. A hybrid powertrain includes an engine and a hybrid transmission, and a controller that controls the hybrid transmission according to the method.

A hybrid system includes a transmission control module, a power source, a transmission, and a drive train. The transmission control module partially operates the hybrid system and receives operating information from various components of the system, calculates power losses in the drive train, and calculates the driving torque needed to reach a target power profile determined from a driver's input.

Method and apparatus for wheel speed estimation include an electrical powertrain having an electric motor providing a motor speed, a wheel, and a mechanical coupling between the motor and the wheel, and an electronic control unit calculating an estimated wheel speed based on the motor speed and mechanical dynamic models of the electrical powertrain.

An output controller for an engine control for an engine system having an internal combustion engine and an electric generator coupled to the internal combustion engine. The output controller including a computing device, an inertia compensator, and an efficiency calculator. The computing device is configured to calculate a target rotational speed for the electric generator and an output torque for the internal combustion engine The inertia compensating device is configured to calculate a torque transmitted to a shaft of the generator and a desired torque for the internal combustion engine. The efficiency calculator is configured to calculate a degree of efficiency of the engine system and to adapt the value for a mechanical target output for the engine system.