Optimal selection of hybrid range state and/or input speed with a blended braking system in a hybrid electric vehicle
First Claim
1. A method for operating a motorized vehicle having a powertrain system that includes an engine coupled to an electro-mechanical transmission selectively operative in one of a plurality of transmission operating range states and one of a plurality of engine states, an accelerator control, and an electrical energy storage device comprising:
- determining a transmission input speed having an associated first power loss;
operating said transmission using said transmission input speed;
providing a braking torque request having an associated second power loss and only in response to an operator depressing a brake pedal to cause blended braking of said vehicle according to a scheme selected from the group consisting of a first braking mode and a second braking mode, said blended braking comprising a sum of friction braking and regenerative braking using resistive torque from at least one electric machine, wherein the sum of said friction braking and said regenerative braking provides a combination that achieves the braking torque request and biasing the value of at least one of the said first power loss and said second power loss based on said braking torque request;
wherein said transmission input speed and said transmission operating range state are dependent on said braking torque request in said first braking mode, and wherein said transmission operating state, but not said transmission input speed, is dependent on said braking torque request in said second braking mode.
18 Assignments
0 Petitions
Accused Products
Abstract
A method for operating a vehicle includes determining a transmission input speed, operating the transmission using the transmission input speed, and providing a braking torque request to cause braking of the vehicle according to a scheme selected from the group consisting of a first braking mode and a second braking mode. The transmission input speed and the transmission operating range state are dependent on said braking torque request in the first braking mode, and wherein the transmission operating state, but not the transmission input speed, is dependent on the braking torque request in the second braking mode.
224 Citations
14 Claims
-
1. A method for operating a motorized vehicle having a powertrain system that includes an engine coupled to an electro-mechanical transmission selectively operative in one of a plurality of transmission operating range states and one of a plurality of engine states, an accelerator control, and an electrical energy storage device comprising:
-
determining a transmission input speed having an associated first power loss; operating said transmission using said transmission input speed; providing a braking torque request having an associated second power loss and only in response to an operator depressing a brake pedal to cause blended braking of said vehicle according to a scheme selected from the group consisting of a first braking mode and a second braking mode, said blended braking comprising a sum of friction braking and regenerative braking using resistive torque from at least one electric machine, wherein the sum of said friction braking and said regenerative braking provides a combination that achieves the braking torque request and biasing the value of at least one of the said first power loss and said second power loss based on said braking torque request; wherein said transmission input speed and said transmission operating range state are dependent on said braking torque request in said first braking mode, and wherein said transmission operating state, but not said transmission input speed, is dependent on said braking torque request in said second braking mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method for improving drivability of a powertrain system having a braking control and including an engine coupled to an electro-mechanical transmission selectively operative in one of a plurality of transmission operating range states and one of a plurality of engine states, comprising:
-
determining a first transmission input speed, said first transmission input speed having a first power loss associated with it; operating said transmission using said first transmission input speed; determining an operational parameter relating said braking control; determining a second transmission input speed responsive to said operational parameter, said second transmission input speed having a second power loss associated with it; biasing the value of at least one of said first power loss and said second power loss, based on said operational parameter; comparing said first power loss to said second power loss subsequent to said biasing; determining a third transmission input speed; and operating said transmission using said third transmission input speed. - View Dependent Claims (12, 13, 14)
-
Specification