| CPC B60W 20/40 (2013.01) [G01C 21/3492 (2013.01); G06F 16/9035 (2019.01); H02J 7/32 (2013.01); B60W 2510/085 (2013.01)] | 19 Claims |
|
1. A system for controlling a powertrain of a vehicle, wherein the powertrain of the vehicle has a parallel hybrid configuration using an engine power source and an electric motor power source and battery system, wherein the engine power source forms part of an engine-driven powertrain of the vehicle, wherein the electric motor power source forms part of a motor-driven powertrain, wherein the engine and motor power sources form part of a combined engine and motor powertrain, the system comprising:
a supervisory controller; and
a database memory including a database of information, the database memory communicatively coupled with the supervisory controller, the database memory configured to store information on predetermined overall optimal engine-driven or motor-driven or combined engine and motor powertrain efficiency maps;
wherein engine-driven powertrain efficiency is defined as overall operating efficiencies of a final drive, a transmission, and the engine power source;
wherein motor-driven powertrain efficiency is defined as overall operating efficiencies of the final drive, the transmission, the electric motor power source, battery, and the engine power source for battery charging;
wherein a set of optimal operation maps is provided for a combined engine and motor powertrain operation state in a power split mode during which both the engine power source and the electric motor power source propel the vehicle under heavy load conditions;
wherein a set of optimal operation maps is provided for the combined engine and generator powertrain operation state during periods of opportunistic battery charging when the vehicle is at light loads or idling;
wherein the database memory characterizes an operating envelope of wheel torque available for the vehicle at each speed level over an entire potential range of driving conditions that include vehicle weight and road grade;
wherein the operating envelope is based on an available power output, an available torque output, and an available speed output from both the engine power source and the electric motor power source;
wherein the database memory includes constraints corresponding to an operation state of the engine-driven powertrain and the motor-driven powertrain, and to concurrent operation state of the combined engine and electric motor powertrain;
wherein the database memory includes optimal transmission gear maps that include an optimal transmission gear selection map for the optimal motor-driven powertrain efficiency map and an optimal transmission gear selection map for optimal engine-driven powertrain efficiency map, wherein the optimal transmission gear selection map for the optimal motor-driven powertrain efficiency map and the optimal engine-driven powertrain efficiency map are different; and
wherein the supervisory controller is configured to determine, based at least in part on the information stored in the database memory, operations to be performed by the engine-driven powertrain, the motor-driven powertrain, and concurrent operation of the engine-driven powertrain and motor-driven powertrain to maximize efficiency of the powertrain of the vehicle.
|
|
8. A method for controlling a parallel hybrid powertrain of a vehicle, the parallel hybrid powertrain including a CD mode and a CS mode including DDC operational control and CDC operational control to manage an engine-driven powertrain and a motor-driven powertrain and the combined engine and motor powertrain, the method comprising:
storing engine-driven powertrain operation information on predetermined optimal operating parameters for separate operation of the engine-driven powertrain consisting of a final drive, a transmission, and the engine power source;
storing motor-driven powertrain operation information on predetermined optimal operating parameters for separate operation of the motor-driven powertrain consisting of the final drive, the transmission, the electric motor power source, battery, and the engine power source for battery charging;
storing the combined engine and motor powertrain operation information on predetermined optimal operating parameters for concurrent operation of the engine, motor, final drive, the transmission, battery, and the engine power source for battery charging;
receiving instantaneous drive cycle data for the vehicle;
calculating tractive power and wheel torque based on the received drive cycle data;
determining, based at least in part on the calculated tractive power, the calculated wheel torque, the engine-driven powertrain operation information, the motor-driven powertrain operation information, the combined engine and motor powertrain information, and current and historical battery state of charge, wherein CD mode, DDC operational control and CDC operational control are determined to optimize a power operation to be performed by the engine-driven powertrain and motor-driven powertrain and combined engine and motor powertrain to maximize efficiency of the parallel hybrid powertrain of the vehicle;
wherein said determining includes:
calculating battery state of charge, tractive power, wheel torque, and speed, based on the received drive cycle data;
identifying a control strategy for operation, the control strategy based on one of the CD mode and the CS mode, wherein the DDC operational control and the CDC operational control are considered in the CS mode;
identifying optimal engine operating characteristics and motor operating characteristics;
identifying corresponding transmission operations, stored in a database module, for the identified optimal engine-driven powertrain operating characteristics and optimal motor-driven powertrain operating characteristics and optimal combined engine and motor operating characteristics;
selectively controlling instantaneous operation of the engine-driven powertrain and the motor-driven powertrain and the combined engine and motor powertrain based on the identified optimal engine-driven powertrain operating characteristics and motor-driven powertrain operating characteristics and combined engine and motor powertrain operating characteristics and the calculated tractive power, wheel torque, and speed;
modulating the instantaneous operation of the engine-driven powertrain and the motor-driven powertrain and the combined engine and motor powertrain to smoothen operation of the parallel hybrid powertrain of the vehicle; and
adjusting instantaneous operation of at least one of the engine-driven powertrain and motor-driven powertrain and the combined engine and motor powertrain based on analysis of real- time traffic data and a current segment or route planned for the vehicle.
|
|
12. A powertrain control system for a parallel hybrid powertrain of a vehicle, the parallel hybrid powertrain including a CD mode and a CS mode with DDC operational control and CDC operational control to manage an engine-driven powertrain and a motor-driven powertrain and a combined engine and motor powertrain, said powertrain control system comprising:
memory operable to store engine-driven powertrain information, a motor-driven powertrain information, and concurrent power source information, the engine-driven powertrain information pertaining to predetermined optimal operating parameters for separate operation of the engine-driven powertrain, the motor-driven powertrain information pertaining to predetermined optimal operating parameters for separate operation of the motor-driven powertrain, the concurrent engine and motor powertrain information pertaining to predetermined optimal operating parameters for concurrent engine and motor powertrain operation; and
a controller operably coupled to the memory, the controller configured to:
receive instantaneous drive cycle data for the vehicle, the controller configured to calculate battery SOC, tractive power, and wheel torque based on the received drive cycle data;
determine a control strategy for operation, the control strategy based on one of CD mode and CS mode, wherein the DDC operational control and the CDC operational control are considered in CS mode;
determine a power operation between the engine-driven powertrain and motor-driven powertrain and combined engine and motor powertrain to maximize efficiency of the parallel hybrid powertrain of the vehicle;
determine the power operation based at least in part on the calculated tractive power, the calculated wheel torque, the engine-driven powertrain information, the motor-driven powertrain information, and the concurrent engine and motor powertrain information;
calculate engine/motor speed based on the received drive cycle data;
identify optimal engine operating characteristics and motor operating characteristics and concurrent engine and motor characteristics;
identify corresponding transmission operations, stored in memory, for the identified optimal engine operating characteristics and motor operating characteristics and concurrent engine and motor characteristics;
selectively control instantaneous operation of the engine-driven power train and the motor-driven power train and the_concurrent engine and motor based on the identified optimal engine operating characteristics and motor operating characteristics and_concurrent engine and motor characteristics and the calculated tractive power, wheel torque, and speed;
modulate instantaneous operation of the engine-driven powertrain and the motor-driven powertrain and concurrent engine and motor powertrain to smoothen operation of the parallel hybrid powertrain of the vehicle;
adjust instantaneous operation of at least one of the engine-driven powertrain and motor-driven powertrain and concurrent engine and motor powertrain based on analysis of real-time traffic data and a current segment or route planned for the vehicle;
identify optimal engine operating characteristics and motor operating characteristics and concurrent engine and motor characteristics, and corresponding transmission operations;
monitor a state of charge for a battery system of the motor-driven powertrain; and
determine whether the parallel hybrid powertrain of the vehicle is to be operated in battery charge depletion mode or battery charge sustaining mode; and
if it is the battery charge depletion mode, determine optimal motor-driven powertrain torque and corresponding speed via interpolation of data stored in the memory relating to the motor operating characteristics, or
if it is the battery charge sustaining mode, then determine optimal engine-driven powertrain torque and corresponding speed using data stored in the memory relating to the engine operating characteristics.
|