Device and method for determination of the drive-power distribution in a hybrid driveline of a vehicle

A device for determination of the drive-power distribution in a hybrid driveline (1, 2) of a vehicle, for example a land or water vehicle or aircraft, with a combustion engine (VM), at least one electric drive machine (EM1, EM2) and a transmission (7), with means to detect a drive-power (fahr_soll_p) desired by a driver, means to detect operating parameters of the combustion engine and at least one electric drive machine (VM, EM1, EM2), means to detect a state of charge of an electrical energy accumulator (28) and means for dividing the drive-power (fahr_soll_p) desired by the driver into nominal power specifications for the combustion engine and at least one electric drive machine (VM, EM1, EM2), a device (22) for determining a nominal state of charge (soc_ksport) of the energy accumulator (28) as a function of the driver's current dynamic or economical manner of driving, and

• for determining a current mode of operation (operating mode) of the driveline as a function of the nominal state of charge (soc_ksport),
• a device (23) for determining a electrically possible nominal drive-power (em_soll_p1) for the at least one electric machine (EM1, EM2) as a function of the nominal state of charge (soc_ksport) and the current mode of operation (operating mode) of the driveline, and
• a device (24) for determining a nominal drive-power (vm_soll_p, em_soll_p) for the combustion engine (VM) and the at least one electric machine (EM1, EM2) as a function of the electrically possible nominal drive-power (em_soll_p1).

A method for determination of a drive-power distribution in a hybrid driveline (1, 2) of a motor vehicle, with a combustion engine (VM), at least one electric drive machine (EM1, EM2) and a transmission (7), the method further comprising the steps of:

• detecting a value of the currently desired drive-power (fahr_soll_p) desired by a driver,
• determining a minimum and maximum power (vm_min_p, vm_max_p) of the combustion engine at a current engine speed,
• determining an actual state of charge (soc_ist) and minimum and maximum states of charge (SOC_MIN, SOC_MAX) of an energy accumulator (28), detecting a sportiness characteristic factor (k_sport) associated with the driver, determining a minimum and maximum charging power (charge_p, discharge_p) of the energy accumulator, and
• determining a the minimum and maximum drive-power (em_min_p, em_max_p) of the at least one electric drive machine,
• a nominal state of charge (soc_ksport) is calculated from the value of the currently desired drive-power (fahr_soll_p) and the sportiness characteristic factor (k_sport), the vehicle's current operating situation is determined as a function of the sportiness characteristic factor (k_sport), the minimum and maximum power (vm_min_p, vm_max_p) of the combustion engine, and the actual state of charge (soc_ist) of the energy accumulator (28), with help of the values for the sportiness characteristic factor (k_sport), the current operating situation, the actual state of charge (soc_ist) and the minimum and maximum states of charge (SOC_MIN, SOC_MAX) of the energy accumulator, a charge power limitation value (charge power limit) and a discharge power limitation value (discharge power limit) and the minimum and maximum power (vm_min_p, vm_max_p) of the combustion engine at its current speed, an electrically possible nominal drive-power value (em_soll_p1) for the at least one electric machine (EM1, EM2) is determined, and with help of the electrically possible nominal drive-power value (em_soll_p1) and the minimum and maximum charge power (charge_p, discharge_p) of the energy accumulator and with the current minimum and maximum drive-power (em_min_p, em_max_p) of the at least one electric machine, nominal drive-power values (em_soll_p, vm_soll_p) are produced for the at least one electric machine (EM1, EM2) and the combustion engine (VM).