Abstract: A method for controlling an input torque provided to a transmission includes executing a first iterative search within a first range of permissible torque values to determine a first torque value based on a first cost value. The first cost value is based on a first set of powertrain measurements measured at a first time. A second cost value based on a second torque value and the first set of powertrain measurements measured at the first time is calculated. The second torque value is determined using a second set of powertrain measurements measured at a second time prior to the first time. One of the first torque value and the second torque value is then selected based on the first cost value and the second cost value.

Abstract: An internal combustion engine is fluidly connected to an exhaust aftertreatment system and operatively connected to an electro-mechanical transmission to transmit tractive power to a driveline. The engine is controlled during an engine operating cycle by determining a temperature of the exhaust aftertreatment system and adjusting power output of the engine based upon the temperature of the exhaust aftertreatment system and a preferred temperature range of the exhaust aftertreatment system. The electro-mechanical transmission is controlled to transmit tractive power to the driveline to meet an operator torque request based upon the adjusted power output of the engine.

Abstract: A method for controlling a hybrid powertrain system selectively operative in one of a plurality of operating range states including an engine includes monitoring an operator torque request and a rotational speed of the output member, determining inertial effects of the transmissions, determining motor torque outputs from the electrical machines and an engine based upon the inertial effects, and selecting a preferred operating range state and a preferred input speed from the engine to the transmission based upon the operator torque request and the inertial effects.

Abstract: Methods and systems for manipulating inputs relating to transmission shifting events in a hybrid-engine powered vehicle equipped with an electro-mechanical hybrid transmission include sets of preferability factors inputted from engine sensors are combined in a microprocessor or computer with other preferability factors generated during engine and vehicle operation to provide an output for a transmission control module, which may execute an operating range or engine state change. Desirable input speeds for a transmission are determined by defining minimum input speeds for each potential transmission operating range state, and ascribing biasing costs to potential transmission input speeds which are slower than the minimum input speeds defined for each potential transmission operating range state.

Abstract: A powertrain includes an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and an electric machine adapted to selectively transmit mechanical power to an output member. A method for controlling the powertrain includes operating the transmission in an operating range state wherein input speed can operate independent of output speed and wherein a reactive torque is transmitted through the transmission. The method further includes monitoring commands affecting a requested output torque, monitoring a calculated output torque, and prioritizing between an input acceleration of the transmission and an output torque of the transmission based upon whether operating the transmission in the operating range state is in transient operation or stable operation.

Abstract: A powertrain includes an engine coupled to an input member of a hybrid transmission. The hybrid transmission is operative to transfer power between an input member and a plurality of torque machines and an output member. A method for controlling the powertrain includes, monitoring operation of the hybrid transmission, determining motor torque offsets for the torque machines, transforming the motor torque offsets for the torque machines to an input torque offset and an output torque offset of the hybrid transmission, and adjusting operation of the engine based upon the input torque offset and the output torque offset of the hybrid transmission.

Abstract: A method for controlling a powertrain system includes determining a current transmission operating range state and engine state, determining at least one potential transmission operating range state and engine state, providing at least one operator torque request, determining preferability factors associated with the current transmission operating range state and engine state, and potential transmission operating range states and engine states, wherein determining preferability factors associated with potential transmission operating range states includes assigning biasing costs to operator torque requests which reside within a pre-determined range of possible operator torque requests for at least two of the potential transmission operating range states, preferentially weighting the preferability factors for the current transmission operating range state and engine state, and selectively commanding changing the transmission operating range state and engine state based upon stheaid preferability factors and th

Abstract: A method of externally charging a powertrain includes monitoring a voltage level of a first battery, determining when the monitored voltage level is below a first voltage threshold, and when the monitored voltage level is below the first voltage threshold, charging the first battery by supplying power from an external power source and increasing voltage of the power supplied by the external power source within the powertrain.

Abstract: A powertrain system includes an engine coupled to an input member of a transmission device operative to transmit torque between the input member and a torque machine and an output member. The torque machine is connected to an energy storage device. A method for controlling a powertrain system includes monitoring a temperature of the energy storage device, selecting a candidate powertrain system operating point, determining an output power from the energy storage device associated with the candidate powertrain system operating point, determining a power loss for operating the powertrain system at the candidate powertrain system operating point, and determining operating costs for operating the powertrain system at the candidate powertrain system operating point associated with the power loss and based upon the temperature of the energy storage device.

Abstract: Short term power limits of an electrical energy storage device are progressively tightened toward long term power limits in accordance with net energy flow or magnitude or duration metrics.

Abstract: A powertrain system includes an engine mechanically coupled to an electro-mechanical transmission at an input thereto selectively operative in one of a plurality of transmission operating range states and one of a plurality of engine states. A method for controlling the powertrain system includes combining sets of preferability factors inputted from engine sensors in a microprocessor or computer with other preferability factors generated during engine and vehicle operation to provide an output for a transmission control module, which may execute an operating range or engine state change.

Abstract: An engine is selectively operative in one of a plurality of engine states to transfer torque to an input member of a hybrid transmission. The hybrid transmission is operative to transfer torque between the input member and a torque machine and an output member to generate an output torque in response to an operator torque request. A method for controlling the engine includes monitoring the operator torque request, determining operating power costs associated with a plurality of candidate engine states in response to the operator torque request, determining transition costs for transitioning the engine from a present engine state to each of the candidate engine states, determining stabilization costs for operating the engine in the present engine state and subsequently operating the engine in each of the candidate engine states, and selecting a preferred engine state based upon the operating power costs, the transition costs, and the stabilization costs for the plurality of engine states.

Abstract: A method to control a powertrain including a transmission, an engine, and an electric machine includes monitoring a rotational speed of the engine, monitoring a temperature of a transmission fluid, determining a maximum hydraulic pressure within a hydraulic control system based upon the rotational speed of the engine and the temperature of the transmission fluid, determining a predicted clutch torque capacity based upon the maximum hydraulic pressure, generating a preferred input torque from the engine based upon the predicted clutch torque capacity, and utilizing the preferred input torque to control the engine.

Abstract: A powertrain system includes a transmission operative to transfer power between an input member and first and second torque machines and an output member. The first and second torque machines are connected to an energy storage device and the transmission is operative in a continuously variable operating range state.

Abstract: A hybrid powertrain system includes an internal combustion engine operatively connected to a second torque machine to transmit torque to an output member. A method for operating the hybrid powertrain system includes monitoring an operator torque request, determining an output torque command based upon the operator torque request, commanding a transition between an engine-off state and an engine-on state, monitoring an engine crank angle, spinning the engine unfueled, estimating cylinder pressure based upon the engine crank angle during the spinning of the engine, predicting a cylinder pulse torque based upon the cylinder pressure, determining a cancellation torque for the second torque machine based upon the predicted cylinder pulse torque, and controlling motor torque output from the second torque machine based upon the cancellation torque and the output torque command.

Abstract: A method for controlling an electromechanical transmission mechanically coupled to first and second electric machines to transmit power to an output member includes determining motor torque constraints and battery power constraints. A preferred output torque to an output member is determined that is achievable within the motor torque constraints, within a range for an additional torque input and based upon the battery power constraints.

Abstract: A powertrain system includes a hybrid transmission coupled to an engine and an auxiliary hydraulic pump. The auxiliary hydraulic pump is commanded to operate at a predetermined speed only when enable criteria are met. An engine-off state is inhibited based upon a difference between a commanded speed and a monitored operating speed of the auxiliary hydraulic pump.

Abstract: A method for controlling torque in a hybrid powertrain system to selectively transfer mechanical power to an output member includes monitoring operator inputs to an accelerator pedal and to a brake pedal. An immediate accelerator output torque request, a predicted accelerator output torque request, an immediate brake output torque request, a predicted brake output torque request, and an axle torque response type are determined. An output torque command to the output member of the transmission is determined based upon the immediate accelerator output torque request and the immediate brake output torque request.

Abstract: A powertrain system includes an engine mechanically coupled to an electro-mechanical transmission selectively operative in one of a plurality of transmission operating range states and one of a plurality of engine states. A method for controlling the powertrain system includes determining a current transmission operating range state and engine state, determining at least one potential transmission operating range state and engine state, providing an operator torque request, determining preferability factors associated with the current transmission operating range state and engine state, and potential transmission operating range states and engine states, preferentially weighting the preferability factors for the current transmission operating range state and engine state, and selectively commanding changing the current transmission operating range state and engine state based upon the preferability factors and the operator torque request.

Abstract: A method to control a powertrain including a transmission, an engine, and an electric machine includes monitoring an input speed, monitoring an output speed, upon initiation of a transmission shift, determining a plurality of input acceleration profiles for controlling the engine and electric machine during the shift, identifying an input acceleration constraint affecting one of the input acceleration profiles, reprofiling the input acceleration profiles based upon the identified input acceleration constraint, and controlling operation of the engine and electric machine based upon the reprofiled input acceleration profiles.