초록 ▼

An energy control strategy (10) for a hybrid electric vehicle that controls an electric motor during bleed and charge modes of operation. The control strategy (10) establishes (12) a value of the power level at which the battery is to be charged. The power level is used to calculate (14) the torque

An energy control strategy (10) for a hybrid electric vehicle that controls an electric motor during bleed and charge modes of operation. The control strategy (10) establishes (12) a value of the power level at which the battery is to be charged. The power level is used to calculate (14) the torque to be commanded to the electric motor. The strategy (10) of the present invention identifies a transition region (22) for the electric motor's operation that is bounded by upper and lower speed limits. According to the present invention, the desired torque is calculated by applying equations to the regions before, during and after the transition region (22), the equations being a function of the power level and the predetermined limits and boundaries.

대표청구항 ▼

1. An energy control strategy for a vehicle system controller for a parallel hybrid electric vehicle having an engine, a motor and a battery having bleed and charge states of operation, said energy control strategy having a measured motor speed, an engine idle speed and a battery state of charge as

1. An energy control strategy for a vehicle system controller for a parallel hybrid electric vehicle having an engine, a motor and a battery having bleed and charge states of operation, said energy control strategy having a measured motor speed, an engine idle speed and a battery state of charge as inputs, said control strategy comprising the steps of:establishing a value that is representative of a power level at which the battery is to be charged, said value called CHARGE_CMD for the Charge state and further comprising: determining a minimum of a predetermined constant power level and a variable power level having a predetermined upper boundary and a predetermined lower boundary for the charge state; wherein when the battery state of charge is equal to said predetermined upper boundary, said variable power level is equal to said predetermined constant power level; wherein when the battery state of charge is equal to said predetermined lower boundary, said variable power level is zero; and wherein when the battery state of charge is between said predetermined upper boundary and said predetermined lower boundary, said variable power level is given by a fraction of said predetermined constant power level; calculating a torque to be commanded to the motor based on said value, said torque to be commanded called TQ_SA_BC; and sending said torque to be commanded to the motor.