SYSTEM AND METHOD OF CONTROLLING A POWERTRAIN
First Claim
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1. A vehicle comprising:
- an engine;
a transmission configured to be selectively coupled to the engine; and
a controller programmed to, responsive to a request to decouple the engine from the transmission received while a traction battery state of charge (SOC) is greater than a threshold SOC, to a decrease in vehicle speed less than a threshold decrease, and to an accelerator pedal position being within a predetermined range, command the transmission to maintain a current gear ratio such that following decoupling of the engine from the transmission, the transmission does not shift while the vehicle speed remains substantially constant and the SOC remains greater than the threshold SOC.
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Abstract
A vehicle and a method of controlling a powertrain are provided. The vehicle may include a controller programmed to operate a powertrain in a hybrid mode. The controller may be further programmed to, responsive to a request to operate the powertrain in electric mode, transition powertrain operation from the hybrid mode to the electric mode without shifting gears until a change in accelerator pedal position exceeds a threshold following the transition.
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Citations
17 Claims
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1. A vehicle comprising:
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an engine; a transmission configured to be selectively coupled to the engine; and a controller programmed to, responsive to a request to decouple the engine from the transmission received while a traction battery state of charge (SOC) is greater than a threshold SOC, to a decrease in vehicle speed less than a threshold decrease, and to an accelerator pedal position being within a predetermined range, command the transmission to maintain a current gear ratio such that following decoupling of the engine from the transmission, the transmission does not shift while the vehicle speed remains substantially constant and the SOC remains greater than the threshold SOC. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A vehicle comprising:
a controller programmed to operate a powertrain in hybrid mode; and responsive to a request to operate the powertrain in electric mode, transition powertrain operation from the hybrid mode to the electric mode without shifting gears until a change in accelerator pedal position exceeds a threshold following the transition. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A powertrain control method comprising:
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operating a powertrain in a hybrid mode at a first gear ratio; and responsive to a request to operate the powertrain in an electric mode associated with an accelerator pedal tip-out while a traction battery state of charge (SOC) is greater than a threshold SOC, transitioning operation of the powertrain from the hybrid mode to the electric mode while maintaining the first gear ratio until an accelerator pedal position changes. - View Dependent Claims (14, 15, 16, 17)
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Specification