METHOD OF OPERATING A VEHICLE UTILIZING REGENERATIVE BRAKING
First Claim
1. Method for operating a vehicle including a powertrain system and a friction braking system, the powertrain system including a hybrid transmission operative in one of a fixed gear operating range state and a continuously variable operating range state to transmit torque between an input member and a torque machine and an output member coupled to a driveline, the method comprising:
- monitoring operator inputs to an accelerator pedal and a brake pedal;
monitoring vehicle speed;
maintaining the transmission in a present operating range state subsequent to the operator disengaging the accelerator pedal absent the operator engaging the brake pedal;
transitioning the transmission device to a continuously variable operating range state subsequent to the operator disengaging the accelerator pedal and the operator engaging the brake pedal;
executing regenerative braking by controlling the torque machine to react torque through the transmission to brake the vehicle through the driveline when the operator engages the brake pedal and the speed of the vehicle is greater than a first threshold; and
disabling the regenerative braking when the operator disengages the brake pedal and subsequently reengages the brake pedal when the speed of vehicle is less than a first threshold and greater less than a second threshold.
19 Assignments
0 Petitions
Accused Products
Abstract
A vehicle includes a powertrain system and a friction braking system, the powertrain system including a hybrid transmission operative in one of a fixed gear operating range state and a continuously variable operating range state to transmit torque between an input member and a torque machine and an output member coupled to a driveline. A method for operating the vehicle includes monitoring operator inputs to an accelerator pedal and a brake pedal, monitoring vehicle speed, maintaining the transmission in a present operating range state subsequent to the operator disengaging the accelerator pedal absent the operator engaging the brake pedal, transitioning the transmission device to a continuously variable operating range state subsequent to the operator disengaging the accelerator pedal and the operator engaging the brake pedal, executing regenerative braking by controlling the torque machine to react torque through the transmission to brake the vehicle through the driveline when the operator engages the brake pedal and the speed of the vehicle is greater than a first threshold, and disabling the regenerative braking when the operator disengages the brake pedal and subsequently reengages the brake pedal when the speed of vehicle is less than a first threshold and greater less than a second threshold.
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Citations
20 Claims
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1. Method for operating a vehicle including a powertrain system and a friction braking system, the powertrain system including a hybrid transmission operative in one of a fixed gear operating range state and a continuously variable operating range state to transmit torque between an input member and a torque machine and an output member coupled to a driveline, the method comprising:
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monitoring operator inputs to an accelerator pedal and a brake pedal; monitoring vehicle speed; maintaining the transmission in a present operating range state subsequent to the operator disengaging the accelerator pedal absent the operator engaging the brake pedal; transitioning the transmission device to a continuously variable operating range state subsequent to the operator disengaging the accelerator pedal and the operator engaging the brake pedal; executing regenerative braking by controlling the torque machine to react torque through the transmission to brake the vehicle through the driveline when the operator engages the brake pedal and the speed of the vehicle is greater than a first threshold; and disabling the regenerative braking when the operator disengages the brake pedal and subsequently reengages the brake pedal when the speed of vehicle is less than a first threshold and greater less than a second threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Method for operating a vehicle including a friction braking system and a transmission device operative in one of a plurality of operating range states including a fixed gear mode and a continuously variable mode to transmit torque between an engine and an electric machine connected to an energy storage device, the method comprising:
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monitoring operator inputs to an accelerator pedal and a brake pedal and monitoring vehicle speed; maintaining the transmission device in a present operating range state subsequent to the operator disengaging the accelerator pedal; transitioning the transmission device to a continuously variable operating range state subsequent to the operator engaging the brake pedal; executing regenerative braking by controlling the torque machine to react torque through the transmission to brake the vehicle through the driveline when the operator engages the brake pedal and the speed of the vehicle is greater than a first threshold; and enabling regenerative braking so long as the brake pedal is engaged and the vehicle speed is greater than a second threshold. - View Dependent Claims (12, 13, 14, 15, 16)
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17. Method for operating a vehicle including a friction braking system and a hybrid transmission operative in one of a plurality of operating range states including a fixed gear and a continuously variable mode to transmit torque between an engine and an electric machine connected to an energy storage device, the method comprising:
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monitoring operator inputs to an accelerator pedal and a brake pedal; monitoring vehicle speed; maintaining the transmission in a present operating range state subsequent to the operator disengaging the accelerator pedal absent engagement of the brake pedal; transitioning the transmission to the continuously variable mode subsequent to the disengagement of the accelerator pedal and engagement of the brake pedal; executing regenerative braking by controlling the torque machine to react torque through the transmission to brake the vehicle through the driveline when the brake pedal is engaged and the speed of the vehicle is greater than a first threshold; and disabling the regenerative braking when one of the speed of the vehicle is less than a second threshold, and the brake pedal is disengaged and subsequently reengaged when the speed of vehicle less than a third threshold. - View Dependent Claims (18, 19, 20)
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Specification