Method of controlling engine and electric motor of hybrid vehicle, by receiving an engine idle torque requirement, comparing instantaneous powertrain torque demand with reference engine idling torque corresponding to base ignition retardation value, and if the instantaneous powertrain torque demand is less than the reference engine idling torque, requesting the reference engine idling torque, and using the motor to generate electricity from the excess torque, reducing net torque of the powertrain. Reference engine idling torque is modelled from airflow measurements. Advantage: improved engine thermal efficiency by reducing ignition timing retardation, excessive energy from the energy is stored as electrical energy. If instantaneous torque demand is above the reference engine idling torque, more torque may be requested. A noise vibration and harshness (NVH) torque limit may be applied dependent on engine speed or mode. If instantaneous torque demand exceeds NVH torque limit, then the output torque may be biased towards the NVH torque limit.
Control of hybrid vehicle engine idling torque
2025-01-08
Patent
Electronic Resource
English
IPC: | B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion |