Electric vehicle (EV) driving mode optimization for a parallel hybrid electric vehicle
First Claim
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1. A method of operating a hybrid electric drive train, the drive train comprising an electric motor and an internal combustion engine, each capable of propelling a vehicle, the method comprising:
- providing a manually selectable first mode, wherein the first mode includes an electric mode; and
after the first mode is selected, operating in the first mode, including;
detecting a battery state of charge;
comparing the battery state of charge to a threshold;
if the battery state of charge exceeds the threshold, entering the electric mode, the electric mode comprising;
propelling the vehicle using only the electric motor;
limiting an allowed vehicle acceleration to below a predetermined acceleration value; and
preventing an engine start; and
providing an override option, wherein the override option allows for starting the engine while otherwise maintaining operation in the electric mode, where maintaining operation in the electric mode includes not using the engine to propel the vehicle.
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Abstract
A method of operating a parallel hybrid electric drive train may include manually selecting a first mode by a user. The first mode include an electric mode that provides for propelling a vehicle using only an electric motor. The method may also include propelling the vehicle in the electric mode, limiting an allowed vehicle acceleration below a predetermined acceleration value, detecting a battery state of charge, and preventing an engine start during operation in the electric mode.
35 Citations
22 Claims
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1. A method of operating a hybrid electric drive train, the drive train comprising an electric motor and an internal combustion engine, each capable of propelling a vehicle, the method comprising:
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providing a manually selectable first mode, wherein the first mode includes an electric mode; and after the first mode is selected, operating in the first mode, including; detecting a battery state of charge; comparing the battery state of charge to a threshold; if the battery state of charge exceeds the threshold, entering the electric mode, the electric mode comprising; propelling the vehicle using only the electric motor; limiting an allowed vehicle acceleration to below a predetermined acceleration value; and preventing an engine start; and providing an override option, wherein the override option allows for starting the engine while otherwise maintaining operation in the electric mode, where maintaining operation in the electric mode includes not using the engine to propel the vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 21)
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11. A method of operating a hybrid electric drive train comprising:
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receiving an indication of a manual selection of a first mode, wherein the first mode includes an electric mode that includes propelling a vehicle using only an electric motor; and after receiving the indication; comparing a battery state of charge to a threshold, and if the battery state of charge exceeds the threshold; propelling the vehicle in the electric mode; and preventing an engine start during operation in the electric mode while propelling the vehicle using only the electric motor; and providing an option for a user override, wherein the user override allows an engine start while otherwise maintaining operation in the electric mode, where maintaining operation in the electric mode includes not using the engine to propel the vehicle. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 22)
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Specification