Abstract: A method for operating a powertrain in a hybrid vehicle is provided. The method comprises providing torque to drive the vehicle from both an electric drive and an engine, where engine torque is varied within an allowable range. When operating the engine at an edge of the range, the range may be adjusted based on conditions. In this way, it is possible to compensate for an engine that has a variable maximum torque output depending on operating conditions.

Abstract: A belt integrated starter generator may selectively drive accessory components while an engine is off. The belt integrated starter generator may also selectively drive a crankshaft of the engine. Clutches are used to access rotational power from the belt.

Abstract: A belt integrated starter generator may selectively drive accessory components while an engine is off. The belt integrated starter generator may also selectively drive a crankshaft of the engine. Clutches are used to access rotational power from the belt.

Abstract: A method for operating a powertrain in a vehicle is provided. The powertrain includes an electric drive and an internal combustion engine. The method comprises providing torque to drive the vehicle from both the electric drive and the engine, where engine torque is varied within an allowable range; and when operating the engine at an edge of the range, adjusting the range based on whether a selected operating condition can be provided by the engine.

Abstract: A controller and a method for use in a vehicle to limit noise, vibration, and harshness (NVH) by controlling torque matching between a first power source and a second power source. A first and a second torque estimate are made for the first power source. The torque matching comprises calculating a correction factor based upon a comparison of the torque estimates made during steady-state operating conditions of the vehicle. The first torque estimate is based on operating parameters for the first power source and the second torque estimate is based on operating parameters for the second power source.

Abstract: An engine management system for 4-cycle engines includes a processing means and utilizes various inputs from sensors operatively connected to the engine for the purpose of providing the correct fuel/air ratio or spark ignition angle for the engine in a manner whereby the transient response is fast. The engine management system utilizes the rotational speed information that is obtained from a magneto or speed sensor to determine the speed of each engine revolution. The system effectively solves many of the fuel/air ratio problems that are caused by load transients occurring on the engine. By comparing such high pass filtered speeds of selected revolutions, the system is able to determine the inferred engine intake air flow. By using measured system rotational inertia compensation factors for the engine together with the inferred intake air flow, the system can accurately determine the amount of fuel to be fed to the engine for proper operation.