Patent ID: 8265815

Claim:
A method of controlling output torque in a vehicle transmission including at least one electric machine and in electrical communication with a battery, comprising: calculating a first long-term output torque constraint with a processor; calculating a first short-term output torque constraint with the processor; calculating a rate limit with the processor; determining a first effective output torque constraint with the processor from the first long-term output torque constraint and the first short-term output torque constraint, wherein the first effective output torque constraint is bounded by both of the first long-term output torque constraint and the first short-term output torque constraint, wherein determining the first effective output torque constraint includes restricting the magnitude of changes in the first long-term output torque constraint to the rate limit, and wherein restricting the magnitude of changes in the first long-term output torque constraint to the rate limit occurs only when the first long-term output torque constraint is tightening; and operating the transmission at the first effective output torque constraint determined by the processor.