A method is provided for operating a hybrid vehicle after a stationary state of the hybrid vehicle having an electric machine and an internal combustion engine with a circulating oil lubrication system. The electric machine and the internal combustion engine can be operated independently of one another and their output shafts can be operatively connected to one another via a clutch and/or a transmission for a separate or common drive. The method includes: starting the electric machine and starting the hybrid vehicle with pure electric drive; connecting the drive shafts during the electric drive and cranking the internal combustion engine without inputting fuel until a defined oil pressure is built up in the circulating oil lubrication system; uncoupling the output shafts; continuing to operate the hybrid vehicle with pure electric drive until the internal combustion engine is started. By way of the method, all the components of the internal combustion engine are lubricated with oil at the start and the service life of the internal combustion engine is increased.

Systems and methods for selecting and scheduling which of a plurality of engine starting devices starts an internal combustion engine of a hybrid vehicle are presented. In one example, a scheduled start of the internal combustion engine via a driveline disconnect clutch is withdrawn during conditions when both a transmission gear shift is requested or in process and when a driver urgency level is greater than a threshold level.

Systems and methods for selecting and scheduling which of a plurality of engine starting devices starts an internal combustion engine of a hybrid vehicle are presented. In one example, a scheduled start of the internal combustion engine via a driveline disconnect clutch is withdrawn during conditions when both a transmission gear shift is requested or in process and when a driver urgency level is greater than a threshold level.

Systems and methods for selecting and scheduling which of a plurality of engine starting devices starts an internal combustion engine of a hybrid vehicle are presented. In one example, a scheduled start of the internal combustion engine via a driveline disconnect clutch is withdrawn during conditions when both a transmission gear shift is requested or in process and when a driver urgency level is greater than a threshold level.

Systems and methods for selecting and scheduling which of a plurality of engine starting devices starts an internal combustion engine of a hybrid vehicle are presented. In one example, a scheduled start of the internal combustion engine via a driveline disconnect clutch is withdrawn during conditions when both a transmission gear shift is requested or in process and when a driver urgency level is greater than a threshold level.

A starting element (100) for use, for example, in a drivetrain of a motor vehicle, includes a piston (310) which divides a first volume (560) that can be filled with a fluid from a second volume (570) that can be filled with a fluid, wherein the piston (310) comprises at least one fluid passage (640) which allows the fluid at least occasionally to pass through the piston (310) from the first volume (560) into the second volume (570) and/or from the second volume (570) into the first volume (560). The at least one fluid passage (640) comprises a passage component part (650) and a receiving opening (660) in the piston (310). The passage component part (650) is inserted into the receiving opening so that at least one passage opening (670) is formed which allows the fluid to pass through at least occasionally.

A starting element (100) for use, for example, in a drivetrain of a motor vehicle, includes a piston (310) which divides a first volume (560) that can be filled with a fluid from a second volume (570) that can be filled with a fluid, wherein the piston (310) comprises at least one fluid passage (640) which allows the fluid at least occasionally to pass through the piston (310) from the first volume (560) into the second volume (570) and/or from the second volume (570) into the first volume (560). The at least one fluid passage (640) comprises a passage component part (650) and a receiving opening (660) in the piston (310). The passage component part (650) is inserted into the receiving opening so that at least one passage opening (670) is formed which allows the fluid to pass through at least occasionally.

A hydrostatic hybrid drive device (H) includes only one hydrostatic displacement machine (1) operated in an open circuit. A delivery line (2) leads to a high pressure accumulator device (3). A shutoff valve (5) controls flow to the high pressure accumulator device (3). A branch line (6) is connected with a low pressure accumulator device (7). A shutoff valve (9) in the intake line (8) shuts off flow to the low pressure accumulator device (7). A discharge line (10) is connected between the intake side (S) of the displacement machine (1) and the shutoff valve (9). A valve device (15) controls the discharge line (10) and the branch line (6).

A hydrostatic hybrid drive device (H) includes only one hydrostatic displacement machine (1) operated in an open circuit. A delivery line (2) leads to a high pressure accumulator device (3). A shutoff valve (5) controls flow to the high pressure accumulator device (3). A branch line (6) is connected with a low pressure accumulator device (7). A shutoff valve (9) in the intake line (8) shuts off flow to the low pressure accumulator device (7). A discharge line (10) is connected between the intake side (S) of the displacement machine (1) and the shutoff valve (9). A valve device (15) controls the discharge line (10) and the branch line (6).