Method and apparatus for operating a vehicle including a hybrid powertrain system during a launch maneuver
First Claim
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1. Method for operating a vehicle including a hybrid powertrain system, comprising:
- enabling a commanded electric vehicle (EV) launch whena high-voltage battery state-of-charge (SOC) is greater than an SOC threshold,a transmission output speed is less than a low speed threshold,a transmission output torque is less than a speed-based torque threshold, andan operator torque request is achievable in an EV fraction mode; and
employing the EV traction mode to execute the commanded EV launch in response to the operator torque request comprising a launch maneuver, wherein said commanded EV launch comprises employing only a non-combustion torque machine to accelerate the vehicle from one of a stopped and a near-stopped condition.
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Abstract
A method for operating a vehicle including a hybrid powertrain system includes enabling a commanded electric vehicle (EV) launch when a high-voltage battery state-of-charge (SOC) is greater than an SOC threshold, a transmission output speed is less than a low speed threshold, a transmission output torque is less than a speed-based torque threshold, and an operator torque request is achievable in the EV traction mode. An EV traction mode is employed to execute the commanded EV launch in response to the operator torque request including a launch maneuver.
23 Citations
20 Claims
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1. Method for operating a vehicle including a hybrid powertrain system, comprising:
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enabling a commanded electric vehicle (EV) launch when a high-voltage battery state-of-charge (SOC) is greater than an SOC threshold, a transmission output speed is less than a low speed threshold, a transmission output torque is less than a speed-based torque threshold, and an operator torque request is achievable in an EV fraction mode; and employing the EV traction mode to execute the commanded EV launch in response to the operator torque request comprising a launch maneuver, wherein said commanded EV launch comprises employing only a non-combustion torque machine to accelerate the vehicle from one of a stopped and a near-stopped condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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- 11. Method for operating a vehicle including a hybrid powertrain system, comprising commanding operation in an electric vehicle (EV) traction mode to effect a launch maneuver in response to an operator torque request when a high-voltage battery state-of-charge (SOC) is greater than an SOC threshold, a transmission output speed is less than a low speed threshold, a transmission output torque is less than a speed-based torque threshold, and the operator torque request is achievable in the EV traction mode, wherein said launch maneuver in the EV traction mode comprises employing only a non-combustion torque machine to accelerate the vehicle from one of a stopped and a near-stopped condition.
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20. Method for operating a vehicle including a hybrid powertrain system, comprising:
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commanding operation in an electric vehicle (EV) traction mode to effect a launch maneuver in response to an operator torque request when a high-voltage battery state-of-charge (SOC) is greater than an SOC threshold, a transmission output speed is less than a low speed threshold, a transmission output torque is less than a speed-based torque threshold, and the operator torque request is achievable in the EV traction mode, wherein said launch maneuver in the EV traction mode comprises employing only a non-combustion torque machine to accelerate the vehicle from one of a stopped and a near-stopped condition; and disabling the commanded operation in the EV traction mode during the launch maneuver when the transmission output speed exceeds a high speed threshold.
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Specification