Patent ID: 9669822
Date: 2017-06-06
CPC Classifications: B60W,Y02T,Y10S

Claim:
1. A method for controlling a powertrain system including an internal combustion engine and electric machines operative to transfer mechanical power through a gear train to an output member coupled to a driveline, wherein the electric machines electrically connect to a battery, the method comprising: determining an audible noise-based maximum engine speed, wherein the engine generates an audible noise that is less than a threshold noise level when operating at a speed that is less than the audible noise-based maximum engine speed; and controlling the electric machines and the engine responsive to an operator torque request including controlling the engine speed to be less than the audible noise-based maximum engine speed when battery power is greater than a minimum threshold, wherein controlling the engine speed to be less than the audible noise-based maximum engine speed when the battery power is greater than a minimum threshold comprises: