Method for Departing from a Recuperation Phase in a Parallel Hybrid Vehicle

A method for exiting a recuperation phase in a parallel hybrid vehicle comprising an internal combustion engine and an electric machine which can be coupled thereto via a clutch and which can be connected to a transmission which is connected to a drive train, wherein the internal combustion engine can be completely decoupled from the electric machine using the clutch, wherein the method comprises:

• in a first step, the vehicle is in a recuperation phase, started by a trigger, with a predefined recuperation driving request,
• in a second step, the electric machine is brought to an increased rotational speed during the recuperation phase,
• in a third step a phase for exiting the recuperation phase is started by a trigger,
• wherein in the phase for existing the recuperation phase, the internal combustion engine is made available for coupling to the electric machine, controlled closing of the clutch and application of positive torque in the electric machine takes place, with the result that the start of the internal combustion engine is carried out as a supported pulse start in such a way that a target rotational speed which is determined between the internal combustion engine to be connected and the electric machine is set for connecting to the transmission input, and in parallel a maximum possible gearspeed for connecting to the drive train is set by means of a gearspeed upshift, in order to satisfy a driving request, and
• in a fourth step, the clutch is closed completely, with the result that the exit from the recuperation phase is completed.

A parallel hybrid vehicle comprising:

• an internal combustion engine and an electric machine which can be coupled thereto via a clutch and which is connected to a transmission which is connected to a drive train, wherein the internal combustion engine can be completely decoupled from the electric machine using the clutch,
• at least one sensing device, control device and execution device respectively configured to sense a trigger for entering and exiting a recuperation phase, and transmitting, receiving and processing signals,
• wherein the vehicle is configured such that:
• in a first step, the vehicle is in a recuperation phase, started by a trigger, with a predefined recuperation driving request,
• in a second step, the electric machine is brought to an increased rotational speed during the recuperation phase,
• in a third step a phase for exiting the recuperation phase is started by a trigger,
• wherein in the phase for existing the recuperation phase, the internal combustion engine is made available for coupling to the electric machine, controlled closing of the clutch and application of positive torque in the electric machine takes place, with the result that the start of the internal combustion engine is carried out as a supported pulse start in such a way that a target rotational speed which is determined between the internal combustion engine to be connected and the electric machine is set for connecting to the transmission input, and in parallel a maximum possible gearspeed for connecting to the drive train is set by means of a gearspeed upshift, in order to satisfy a driving request, and
• in a fourth step, the clutch is closed completely, with the result that the exit from the recuperation phase is completed.

A parallel hybrid vehicle comprising

• an internal combustion engine and an electric machine which can be coupled thereto via a clutch with interaction with a device for shock isolation, comprising at least one flywheel mass and one second clutch, which electric machine is connected to a transmission which is connected to a drive train, wherein the internal combustion engine can be completely decoupled from the electric machine using the clutch with interaction with the device for shock isolation,
• at least one sensing device, control device and execution device respectively configured to sense a trigger for entering and exiting a recuperation phase, and transmitting, receiving and processing signals,
• wherein the vehicle is configured such that:
• in a first step the vehicle is in a recuperation phase, started by the sensed trigger, with a predefined recuperation driving request,
• in a second step, the electric machine is brought to an increased rotational speed during the recuperation phase,
• in a third step, a phase for exiting the recuperation phase is started by a trigger,
• wherein in the phase for exiting the recuperation phase, the internal combustion engine is made available for coupling to the electric machine in that the second clutch is opened, and when the latter is open, the clutch is closed, with the result that the start of the internal combustion engine is carried out as a pulse start in such a way that a target rotational speed which is determined between an internal combustion engine which is to be connected and a flywheel mass for connecting to the transmission input is set, and in parallel a maximum possible gearspeed for connecting to the drive train is set by means of a gearspeed upshift, in order to satisfy a present driving request, and
• in a fourth step, the second clutch is closed in a controlled fashion, with the result that the exit from the recuperation phase is completed.