Control method for powertrain of hybrid vehicle in compound split mode

A control method for a powertrain of a hybrid vehicle in a compound split mode, comprising:

• determining, a controller, whether a current driving mode is a compound split mode;
• determining, by the controller, a target speed of an engine;
• determining, by the controller, whether a difference of target speed of the engine and a current engine speed is within a predetermined error range;
• calculating, by the controller, an output torque of a first motor/generator and controlling the first motor/generator according to the calculated output torque of the first motor/generator;
• and
• calculating, by the controller, a final torque of a second motor/generator based on a target torque of the second motor/generator, which is calculated based on a gear ratio of a first sun gear and a first ring gear, a gear ratio of a second sun gear and a second ring gear, a demand torque of the powertrain and the output torque of the first motor/generator, and a compensation value which is determined based on a target speed of the engine, a current speed of the engine, and the demand torque based on driving conditions, and controlling the second motor/generator according to the calculated final torque of the second motor/generator.

A non-transitory computer readable medium containing program instructions executed by a processor or controller, the computer readable medium comprising:

• program instructions that determine whether a current driving mode is a compound split mode;
• program instructions that determine a target speed of an engine;
• program instructions that determine whether a difference of target speed of the engine and a current engine speed is within a predetermined error range;
• program instructions that calculate an output torque of a first motor/generator and control the first motor/generator according to the calculated output torque of the first motor/generator;
• and
• program instructions that calculate final torque of a second motor/generator based on a target torque of the second motor/generator, which is calculated based on a gear ratio of a first sun gear and a first ring gear, a gear ratio of a second sun gear and a second ring gear, a demand torque of the powertrain and the output torque of the first motor/generator, and a compensation value which is determined based on a target speed of the engine, a current speed of the engine, and the demand torque based on driving conditions, and control the second motor/generator according to the calculated final torque of the second motor/generator.