Systems and methods for controlling engine torque

An engine comprising a crankshaft, the engine being coupled to a first e-machine, a second e-machine and a controller, wherein the controller is configured to:

• determine a drive torque demand on a crankshaft of an engine;
• determine an accessory torque demand on the crankshaft, the accessory torque demand comprising a first torque demand of the first e-machine and a second torque demand of the second e-machine;
• determine whether the sum of the drive torque demand and the accessory torque demand is greater than a usable torque capacity output from the crankshaft;
• increase a speed of the engine in response to determining that the sum of the drive torque demand and the accessory torque demand is greater than the usable torque capacity output from the crankshaft;
• and
• electrically connect the first e-machine to a first powernet and electrically connect the second e-machine to a second powernet, wherein the first powernet and the second powernet are electrically isolated from each other.

A non-transitory computer-readable medium having instructions encoded thereon for carrying out a method of controlling engine torque, that, when executed by control circuitry, cause the control circuitry to:

• determine a drive torque demand on a crankshaft of an engine;
• determine an accessory torque demand on the crankshaft, the accessory torque demand comprising a first torque demand from a first e-machine and a second torque demand from a second e-machine;
• determine whether the sum of the drive torque demand and the accessory torque demand is greater than a usable torque capacity output from the engine crankshaft;
• increase a speed of the engine in response to determining that the sum of the drive torque demand and the accessory torque demand is greater than the usable torque capacity output from the engine crankshaft;
• and
• electrically connect the first e-machine to a first powernet and electrically connect the second e-machine to a second powernet, wherein the first powernet and the second powernet are electrically isolated from each other.