Optimal engine operating power management strategy for a hybrid electric vehicle powertrain
First Claim
1. An engine power management method for a hybrid electric vehicle powertrain having power delivery components comprising an engine, an electric generator, an electric motor, a battery electrically coupled to the generator and the motor, and gearing mechanically coupling the motor, the generator and the engine to define a power delivery system with plural power flow paths as engine mechanical power and motor and generator power are distributed to vehicle traction wheels, the method comprising the steps of:
- determining power delivery loss for each of the power delivery components for a given vehicle speed and for a given total power command;
determining a total power delivery system loss by comparing the power delivery losses for each of the components for a given vehicle speed; and
determining an engine speed command corresponding to a minimum value for the total power delivery system loss whereby the powertrain operates with optimum total power delivery system efficiency.
0 Assignments
0 Petitions
Accused Products
Abstract
A method is disclosed for managing power in a hybrid electric vehicle powertrain having multiple components, including an engine, a motor, a generator and a high voltage battery. Power losses in the individual components are computed. An engine speed corresponding to a minimum value for the power losses is selected to achieve optimal total powertrain efficiency.
-
Citations
4 Claims
-
1. An engine power management method for a hybrid electric vehicle powertrain having power delivery components comprising an engine, an electric generator, an electric motor, a battery electrically coupled to the generator and the motor, and gearing mechanically coupling the motor, the generator and the engine to define a power delivery system with plural power flow paths as engine mechanical power and motor and generator power are distributed to vehicle traction wheels, the method comprising the steps of:
-
determining power delivery loss for each of the power delivery components for a given vehicle speed and for a given total power command; determining a total power delivery system loss by comparing the power delivery losses for each of the components for a given vehicle speed; and determining an engine speed command corresponding to a minimum value for the total power delivery system loss whereby the powertrain operates with optimum total power delivery system efficiency. - View Dependent Claims (2, 3, 4)
-
Specification