Patent ID: 8228035

Claim:
A method for controlling regeneration of a battery for a vehicle having an electrically variable transmission comprising: determining a scaled value for a state of charge of the battery, wherein the scaled value for the state of charge of the battery is proportional to an actual state of charge of the battery when the actual state of charge of the battery is between a first state of charge threshold and a second state of charge threshold, wherein the scaled value for the state of charge of the battery is equal to 1.0 when the actual state of charge of the battery is less than the first state of charge threshold; and wherein the scaled value for the state of charge of the battery is equal to 0.0 when the actual state of charge of the battery is greater than the second state of charge threshold; determining a scaled value for a battery temperature, wherein the scaled value for the battery temperature is proportional to an actual battery temperature when the actual battery temperature is between a first temperature threshold and a second temperature threshold, wherein the scaled value for the battery temperature is equal to 1.0 when the actual battery temperature is less than the first temperature threshold; and wherein the scaled value for the battery temperature is equal to 0.0 when the actual battery temperature is greater than the second temperature threshold; calculating an actual regeneration amount by multiplying the scaled value for the state of charge of the battery with the scaled value for the battery temperature and with a requested regeneration value; controlling the regeneration of the battery for the vehicle according to the calculated regeneration amount; wherein a state of charge range defined by the first state of charge threshold and the second state of charge threshold is greater than an ideal state of charge range for the battery; and wherein a battery temperature range defined by the first temperature threshold and the second temperature threshold is greater than an ideal temperature range for the battery.