METHOD OF CONTROLLING AUXILIARY POWER UNIT IN A SERIES HYBRID ELECTRIC BUS

摘要

A method of controlling an auxiliary power unit for a tandem hybrid bus is disclosed. The disclosed method for controlling an auxiliary power unit for a serial hybrid bus includes: inputting information required for a vehicle controller of a serial hybrid bus and generating a driving torque (TM) of the serial hybrid bus motor; Inputting a rotational speed (ωM) signal of the electric motor and a required power reference value (PVEH) signal to the vehicle controller, and determining whether the battery charge state SOC is smaller than its lower limit SOClow_limit; When the state of charge of the battery is smaller than the lower limit value, the auxiliary power request amount PAPU required from the engine and the generator of the series hybrid bus is set to the maximum power value PAPU_max, and the state of the auxiliary power unit is in a transient state. Determining; If the state of the auxiliary power unit is not in a transient state, the torque τ of the series hybrid bus engine and the speed of the generator ω are input to the controller of the auxiliary power unit in the table data, and the engine torque ( τENG) and a speed ωG of the generator; Outputting the torque of the engine and sending it to an engine control unit (ECU) of the serial hybrid bus, outputting the speed of the generator and sending it to a generator controller (GCU).;According to the present invention, it is possible to reduce the fuel consumption rate and nitrogen oxide emissions, there is an advantage that can be operated to a high efficiency point in each of the engine and generator.