Internal combustion engine cranking is carried out including with a limited overlapping of cranking with a starter motor and a starter/generator during at least the initial compression stroke during a cranking cycle.

A controller of a hybrid system including an internal combustion engine and a motor generator connected to each other via a belt includes processing circuitry configured to execute a power generation process that applies a load to the engine by controlling the motor generator to generate power when a first execution condition of an idling stop is satisfied, a slip rate calculation process that calculates a slip rate of the belt based on a rotational speed of the engine and a rotational speed of the motor generator while the power generation process is being executed, a determination process that determines whether or not a second execution condition of the idling stop is satisfied after waiting until a predetermined period elapses, when the slip rate is equal to or more than a threshold, and an idling stop process, when determining that the second execution condition is satisfied.

A method of operating an accessory drive system for a motor vehicle, wherein the accessory drive system includes one or more accessory components, a motor generator of the motor vehicle, and a flexible drive element configured to transmit a torque load between the one or more accessory components and the motor generator, includes determining a maximum permissible flexible drive element torque threshold, detecting an increase in torque demand on the flexible drive element, determining when the torque demand on the flexible drive element will exceed the flexible drive element torque threshold, and reducing the torque demand of one or more of the accessory components so that the flexible drive element torque threshold is not exceeded.

Methods and systems are provided for an isolator. In one example, system may include an isolator comprising a flexible laminated membrane comprising a non-linear torsional stiffness for compensation of axial, lateral, and angular displacements between a drive shaft and a clutch.

Methods and systems are provided for an isolator. In one example, system may include an isolator comprising a flexible laminated membrane comprising a non-linear torsional stiffness for compensation of axial, lateral, and angular displacements between a drive shaft and a clutch.

A starting device is used in a starting system that includes a starting electric motor unit and a rotating electrical machine; the starting electric motor unit including a motor that rotates a pinion gear, and a pushing member that pushes out the pinion gear toward a ring gear, the ring gear rotating together with a crankshaft of an engine; the rotating electrical machine being connected to the crankshaft and rotating the crankshaft; the starting system being configured to push, using the pushing member, the pinion gear toward the ring gear, and drive the motor to rotate, based on driving force of the motor, the ring gear via the pinion gear, thus starting the engine. The starting device includes a drive instruction unit that instructs the rotating electrical machine to rotate the ring gear via the crankshaft during a pre-drive period before drive of the motor.

A front end accessory drive system is disclosed. The system includes a hub configured to drivingly engage with a crankshaft and a gear transmission system. A one-way clutch includes a first bearing ring connected to an end of a plurality of planet pins of the gear transmission system, and a second bearing ring connected to a sun gear of the gear transmission system. A pump configured to direct hydraulic fluid through a hydraulic fluid circuit. A clutch pack is in fluid connection with the hydraulic fluid circuit. The clutch pack includes at least one clutch plate supported by the gear transmission system, such that a portion of the gear transmission system is grounded via frictional engagement of the at least one clutch plate in an actuated state of the clutch pack.

A method and system for operating a vehicle that includes feedback of operating status of an engine starting system is described. In one example, the method inhibits automatic engine pull-down in response to feedback from an engine starting system that does not meet expectations. The system and method may provide diagnostics for the engine starting system.

A method for operating a vehicle that may be automatically stopped and started is described. In one example, the method includes starting an engine via expansion stroke combustion in response to a request to urgently start the engine. In addition, the method includes adjusting a position of a compression relief valve in response to a predicted urgency of an engine start.

Methods and systems are provided for an isolator. In one example, system may include an isolator comprising a flexible laminated membrane comprising a non-linear torsional stiffness for compensation of axial, lateral, and angular displacements between a drive shaft and a clutch.