Torque control for hybrid electric vehicle speed control operation
First Claim
1. A method of controlling a hybrid propulsion system for a vehicle including a first electric energy conversion device for exchanging torque through a transmission device, the transmission device exchanging torque with a first at least one drive wheel, the hybrid propulsion system having a second electric energy conversion device for exchanging torque with a second at least one drive wheel, operation of the first electric energy conversion device, the transmission device, and the second electric energy conversion device controlled by a control system, the method comprising:
- during a vehicle cruise control operation of the vehicle to maintain vehicle speed of the vehicle at a desired speed, in response to vehicle acceleration of the vehicle resulting in vehicle speed of the vehicle beyond the desired speed, the vehicle acceleration of the vehicle not caused by vehicle operator input of the vehicle, varying torque output of at least one of the first electric energy conversion device and the second electric energy conversion device to provide brake torque to at least one of the first at least one drive wheel and the second at least one drive wheel to decelerate the vehicle to the desired speed, where selection of said one of the first and second electric energy conversion device is based on an operating condition of the vehicle.
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Accused Products
Abstract
A method for operating a vehicle hybrid propulsion system is described. During a vehicle speed control operation where a speed of the vehicle is maintained at a desired speed, in response to acceleration resulting in vehicle speed beyond the desired speed, the acceleration not caused by vehicle operator input, the torque output of an upstream and/or downstream electric energy conversion device provides brake torque to a drive wheel to decelerate the vehicle to the desired speed. The selection of the electric energy conversion device may be based on an operating condition to achieve improved control and efficiency.
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Citations
14 Claims
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1. A method of controlling a hybrid propulsion system for a vehicle including a first electric energy conversion device for exchanging torque through a transmission device, the transmission device exchanging torque with a first at least one drive wheel, the hybrid propulsion system having a second electric energy conversion device for exchanging torque with a second at least one drive wheel, operation of the first electric energy conversion device, the transmission device, and the second electric energy conversion device controlled by a control system, the method comprising:
during a vehicle cruise control operation of the vehicle to maintain vehicle speed of the vehicle at a desired speed, in response to vehicle acceleration of the vehicle resulting in vehicle speed of the vehicle beyond the desired speed, the vehicle acceleration of the vehicle not caused by vehicle operator input of the vehicle, varying torque output of at least one of the first electric energy conversion device and the second electric energy conversion device to provide brake torque to at least one of the first at least one drive wheel and the second at least one drive wheel to decelerate the vehicle to the desired speed, where selection of said one of the first and second electric energy conversion device is based on an operating condition of the vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of controlling a hybrid propulsion system for a vehicle including a first electric energy conversion device for exchanging torque through a transmission device, an internal combustion engine also for exchanging torque through the transmission device, the transmission device exchanging torque with a first drive wheel, the hybrid propulsion system having a second electric energy conversion device for exchanging torque with a second drive wheel, the hybrid propulsion system further including an electrical energy storage device coupled to the first electric energy conversion device and the second electric energy conversion device, operation of the first electric energy conversion device, the internal combustion engine, the transmission device, and the second electric energy conversion device controlled by a control system configured to carry out the method, the method comprising:
in response to vehicle acceleration of the vehicle resulting in a vehicle speed of the vehicle being beyond a desired vehicle speed of the vehicle during a cruise control operation, the vehicle acceleration of the vehicle not caused by vehicle operator input of the vehicle, providing brake torque output to decelerate the vehicle to maintain the desired speed and maintain an operating condition within operational limits by selection of a mode from a first mode, a second mode, a third mode, a fourth mode, a fifth mode, and a sixth mode at different operating conditions of the vehicle, wherein the first mode comprises providing brake torque from the second electric energy conversion device, the second mode comprises providing brake torque from the first electric energy conversion device, the third mode comprises providing brake torque from the first electric energy conversion device and the second electric energy conversion device, the fourth mode comprises providing brake torque from the internal combustion engine, the fifth mode comprises providing brake torque from the internal combustion engine and the first electric energy conversion device, and the sixth mode comprises providing brake torque from the internal combustion engine and the second electric energy conversion device, the operating condition including one or more of the vehicle speed of the vehicle, the desired vehicle speed of the vehicle, a state of charge of the electrical energy storage device, a speed of at least one of the first and second electric energy conversion devices, a temperature of at least one of the first and second electric energy conversion devices, an occurrence of a traction control event in at least one of the first drive wheel and the second drive wheel, and a total requested brake torque. - View Dependent Claims (10, 11, 12, 13, 14)
Specification