An embodiment relates to a method for predicting a voltage dip in a vehicle electrical system before a planned start of a load in a motor vehicle. The embodiment operates to ascertain a value of supply current expected to be required after the start of the load. An electrical voltage source and an energy store connected in parallel to a voltage source via the vehicle electrical system provide the supply current for operating the load. The energy store blocks a charge current into the energy store or blocks a discharge current out of the energy store based on a vehicle electrical system voltage of the vehicle electrical system being greater than a maximum value. Based on an instantaneous value of the vehicle electrical system voltage, the embodiment further ascertains a proportion of the supply current that the voltage source generates as a source current without the energy store until the vehicle electrical system voltage has fallen to the maximum value.

A transmission assembly including a clutch system, an accumulator, and a controller is provided. The clutch system may include a flow source. The accumulator may be selectively in communication with the flow source via a solenoid valve. The controller may be programmed to, responsive to detection of a vehicle stop and the accumulator charged below a predetermined threshold, output a command to open the solenoid valve to rapidly charge the accumulator from the flow source. The predetermined threshold may be an accumulator pressure between 700 kPa and 900 kPa. The controller may be further programmed to, responsive to detection of the accumulator being charged to or above the predetermined threshold, output a shut down command to an engine in communication with the transmission assembly and to output a close command to the solenoid valve. The flow source may be a pump out circuit or a line pressure circuit.

A system and method for operating a vehicle equipped with an automatic stop and start system is disclosed. The vehicle includes an internal combustion engine, an automatic transmission and a fluid launch device with an impeller disconnect clutch. A controller may initiate an automatic stop or start of the engine under certain operating conditions. During an engine start/stop event, the engine is automatically shut down and the impeller clutch of the fluid launch device may be disengaged to decouple the engine and transmission from the driveline to provide for improved fuel economy and reduced emissions.

A vehicle drive device that includes a mechanical oil pump that is driven by a driving force source for a wheel; an auxiliary oil pressure source; a driving force transmission mechanism that transmits a driving force between the driving force source and the wheel; and a case that accommodates at least the driving force transmission mechanism.

A first electric power generation device configured to produce an accessory voltage according to a first instruction voltage. A second electric power generation device configured to produce the accessory voltage according to a second instruction. An electric control unit is configured to execute crank position stop control for stopping a crank of the engine at a target position when the engine is stopped by controlling the first electric power generation device such that a current is circulated in the first electric power generation device and the rotating electric machine generates braking torque. The electric control unit is configured to execute the crank position stop control in a state in which the second instruction voltage is equal to or higher than the first instruction voltage.

An embodiment relates to a method for predicting a voltage dip in a vehicle electrical system before a planned start of a load in a motor vehicle. The embodiment operates to ascertain a value of supply current expected to be required after the start of the load. An electrical voltage source and an energy store connected in parallel to a voltage source via the vehicle electrical system provide the supply current for operating the load. The energy store blocks a charge current into the energy store or blocks a discharge current out of the energy store based on a vehicle electrical system voltage of the vehicle electrical system being greater than a maximum value. Based on an instantaneous value of the vehicle electrical system voltage, the embodiment further ascertains a proportion of the supply current that the voltage source generates as a source current without the energy store until the vehicle electrical system voltage has fallen to the maximum value.

Air conditioning systems and methods for a vehicle having a start-stop engine system. The systems and methods cool the vehicle's passenger cabin when the vehicle's engine and air conditioning compressor are off.

A system and method for operating a vehicle equipped with an automatic stop and start system is disclosed. The vehicle includes an internal combustion engine, an automatic transmission and a fluid launch device with an impeller disconnect clutch. A controller may initiate an automatic stop or start of the engine under certain operating conditions. During an engine start/stop event, the engine is automatically shut down and the impeller clutch of the fluid launch device may be disengaged to decouple the engine and transmission from the driveline to provide for improved fuel economy and reduced emissions.

A vehicle having an integrated function of assisting an engine and compressing a refrigerant includes a motor unit and a compression unit coupled within a housing, and a first clutch unit coupled to a rotation shaft of the motor unit or a rotation shaft of the compression unit and that connects or releases a driving force of an engine and a driving force of the motor unit.

A system and method for operating a vehicle equipped with an automatic stop and start system is disclosed. The vehicle includes an internal combustion engine, an automatic transmission and a fluid launch device with an impeller disconnect clutch. A controller may initiate an automatic stop or start of the engine under certain operating conditions. During an engine start/stop event, the engine is automatically shut down and the impeller clutch of the fluid launch device may be disengaged to decouple the engine and transmission from the driveline to provide for improved fuel economy and reduced emissions.