Control of engine pulse torque cancellation commands

A method of controlling engine pulse torque cancellation commands in a powertrain assembly having an engine, a first motor/generator, a second motor/generator, a controller and a transmission having at least one planetary gear set, an input member and an output member, the method comprising:

• determining an engine pulse torque (TP), via the controller;
• wherein the engine pulse torque cancellation commands include a first motor torque pulse command (TA) and a second motor torque pulse command (TB);
• calculating the first motor torque pulse command (TA), via the controller, for the first motor/generator as a product of a first gear factor (G1), the engine pulse torque (TP) and a first ratio (IA/IE) of a predetermined first moment of inertia (IA) for the first motor/generator and a predetermined engine moment of inertia (IE) for the engine;
• calculating the second motor torque pulse command (TB), via the controller, for the second motor/generator as a product of a second gear factor (G2), the engine pulse torque (TP) and a second ratio (IB/IE) of a predetermined second moment of inertia (IB)) for the second motor/generator and the predetermined engine moment of inertia (IE);
• and
• controlling the first motor/generator based on the first motor torque pulse command and controlling the second motor/generator based on the second motor torque pulse command.

A hybrid vehicle comprising:

• a transmission having an input member, an output member and at least two planetary gear sets;
• an engine operatively connected to the transmission and having a predetermined engine moment of inertia (IE);
• a first motor/generator operatively connected to the transmission and having a predetermined first moment of inertia (IA);
• a second motor/generator operatively connected to the transmission and having a predetermined second moment of inertia (IB);
• and
• a controller in communication with the transmission, the controller including a processor and memory on which is recorded instructions for executing a method for controlling engine pulse torque cancellation commands;
• wherein the engine pulse torque cancellation commands include a first motor torque pulse command (TA) and a second motor torque pulse command (TB);
• wherein execution of the instructions causes the controller to:
• determine an engine pulse torque (TP);
• calculate the first motor torque pulse command (TA) for the first motor/generator as a product of a first gear factor (GA), the engine pulse torque (TP) and a first ratio (IA/IE) of the predetermined first moment of inertia (IA) and the predetermined engine moment of inertia (IE);
• calculate the second motor torque pulse command (TB), for the second motor/generator as a product of a second gear factor (GB), the engine pulse torque (TP) and a second ratio (IB/IE) of the predetermined second moment of inertia (IB) and the predetermined engine moment of inertia (IE);
• and
• control the first motor/generator based on the first motor torque pulse command (TA) and control the second motor/generator based on the second motor torque pulse command (TB).