Electrically-variable accessory drive for engine start
First Claim
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1. A method for controlling operation of an internal combustion engine mechanically coupled via a planetary gear set to an accessory drive system and a torque machine, the method comprising:
- monitoring operator inputs;
monitoring engine operation parameters;
selecting a preferred operational state among a plurality of operational states in response to the operator inputs and the engine operation parameters for operating the engine, the torque machine and an accessory brake of the accessory drive system, the accessory brake comprising a potential energy conversion device configured toselectively accept torque from at least one of the engine and the torque machine transferred through the planetary gear set to control speed of the accessory drive system, andselectively transfer power to an energy storage device; and
controlling the accessory drive system in the selected one of a plurality of operational states, the plurality of operational states comprisingan engine autostop accessory control state including operating the torque machine in a torque generating state and transferring the generated torque to the accessory drive,an engine autostart state including operating the torque machine in the torque generating state and transferring the generated torque to the engine,an engine torque assist state including operating the torque machine in the torque generating state and transferring the generated torque to the engine, andan energy power generation state including operating the torque machine in a power generating state to react engine torque.
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Abstract
A hybrid powertrain system includes an internal combustion engine mechanically coupled through a planetary gear set to an accessory drive and a torque machine. Operator inputs and engine operating parameters are monitored to select an operational state including one of an autostop accessory control state, autostart operation state, engine torque assist state, and energy power generation state.
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Citations
16 Claims
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1. A method for controlling operation of an internal combustion engine mechanically coupled via a planetary gear set to an accessory drive system and a torque machine, the method comprising:
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monitoring operator inputs; monitoring engine operation parameters; selecting a preferred operational state among a plurality of operational states in response to the operator inputs and the engine operation parameters for operating the engine, the torque machine and an accessory brake of the accessory drive system, the accessory brake comprising a potential energy conversion device configured to selectively accept torque from at least one of the engine and the torque machine transferred through the planetary gear set to control speed of the accessory drive system, and selectively transfer power to an energy storage device; and controlling the accessory drive system in the selected one of a plurality of operational states, the plurality of operational states comprising an engine autostop accessory control state including operating the torque machine in a torque generating state and transferring the generated torque to the accessory drive, an engine autostart state including operating the torque machine in the torque generating state and transferring the generated torque to the engine, an engine torque assist state including operating the torque machine in the torque generating state and transferring the generated torque to the engine, and an energy power generation state including operating the torque machine in a power generating state to react engine torque. - View Dependent Claims (2, 4, 5, 7, 9)
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3. A method for controlling operation of an internal combustion engine mechanically coupled via a planetary gear set to an accessory drive system and a torque machine, the method comprising:
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monitoring operator inputs; monitoring engine operation parameters; and controlling the accessory drive system in response to the operator inputs and the engine operation parameters in one of a plurality of operational states, comprising an engine autostop accessory control state including operating the torque machine in a torque generating state comprising a torque output that is less than an engine breakaway torque and transferring the generated torque to the accessory drive, wherein the engine autostop accessory control state further comprises applying an accessory brake to a member of the planetary gear set, an engine autostart state including operating the torque machine in the torque generating state and transferring the generated torque to the engine, an engine torque assist state including operating the torque machine in the torque generating state and transferring the generated torque to the engine, and an energy power generation state including operating the torque machine in a power generating state to react engine torque.
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6. A method for controlling operation of an internal combustion engine mechanically coupled via a planetary gear set to an accessory drive system and a torque machine, the method comprising:
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monitoring operator inputs; monitoring engine operation parameters; and controlling the accessory drive system in response to the operator inputs and the engine operation parameters in one of a plurality of operational states, comprising an engine autostop accessory control state including operating the torque machine in a torque generating state and transferring the generated torque to the accessory drive, an engine autostart state including operating the torque machine in the torque generating state and transferring the generated torque to the engine, wherein the engine autostart state comprises actuating an accessory brake coupled to the planetary gear set to restrict transfer of the generated torque to the accessory drive system, an engine torque assist state including operating the torque machine in the torque generating state and transferring the generated torque to the engine, and an energy power generation state including operating the torque machine in a power generating state to react engine torque.
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8. A method for controlling operation of an internal combustion engine mechanically coupled via a planetary gear set to an accessory drive system and a torque machine, the method comprising:
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monitoring operator inputs; monitoring engine operation parameters; and controlling the accessory drive system in response to the operator inputs and the engine operation parameters in one of a plurality of operational states, comprising an engine autostop accessory control state including operating the torque machine in a torque generating state and transferring the generated torque to the accessory drive, an engine autostart state including operating the torque machine in the torque generating state and transferring the generated torque to the engine, an engine torque assist state including operating the torque machine in the torque generating state and transferring the generated torque to the engine comprising determining that an operator torque request has exceeded a predetermined level, determining an operating parameter associated with the energy storage device, operating the torque machine in the torque generating state so long as the operating parameter associated with the energy storage device exceeds a predetermined level, and actuating an accessory brake coupled to the planetary gear set to restrict transfer of the generated torque to the accessory drive system, and an energy power generation state including operating the torque machine in a power generating state to react engine torque.
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10. A method for controlling operation of an internal combustion engine mechanically coupled via a planetary gear set to an accessory drive system and a torque machine, the method comprising:
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monitoring operator inputs; monitoring engine operation parameters; and controlling the accessory drive system in response to the operator inputs and the engine operation parameters in one of a plurality of operational states, comprising an engine autostop accessory control state including operating the torque machine in a torque generating state and transferring the generated torque to the accessory drive, an engine autostart state including operating the torque machine in the torque generating state and transferring the generated torque to the engine, an engine torque assist state including operating the torque machine in the torque generating state and transferring the generated torque to the engine, and an energy power generation state including operating the torque machine in a power generating state to react engine torque, wherein the power generating state comprises determining that none of the other operational states are active, and actuating an accessory brake coupled to the planetary gear set to restrict torque transfer to the accessory drive system.
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11. A method for controlling operation of an internal combustion engine mechanically coupled via a planetary gear set to an accessory drive system and a torque machine, wherein the accessory drive system includes an accessory brake, the method comprising:
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monitoring operator inputs; monitoring engine operation parameters; selecting one of a plurality of operational states for operating the engine, the accessory drive system, and the torque machine in response to the operator inputs and the engine operation parameters; and operating the engine, the accessory brake of the accessory drive system, and the torque machine in the selected operational state to control speed of accessories included in the accessory drive, the accessory brake comprising a potential energy conversion device configured to selectively accept torque from the engine and the torque machine transferred through the planetary gear set to control speed of the accessories included in the accessory drive, and selectively transfer power to an energy storage device. - View Dependent Claims (12, 13, 16)
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14. A method for controlling operation of an internal combustion engine mechanically coupled via a planetary gear set to an accessory drive system and a torque machine, wherein the accessory drive system includes an accessory brake, the method comprising:
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monitoring operator inputs; monitoring engine operation parameters; selecting one of a plurality of operational states for operating the engine, the accessory drive system, and the torque machine in response to the operator inputs and the engine operation parameters, wherein the plurality of operational states comprises an autostop accessory control state, an autostart state, an engine torque assist state, and an energy power generation state; and operating the engine, the accessory drive system, and the torque machine in the selected operational state to control speed of accessories included in the accessory drive, wherein operating the engine, the accessory drive system, and the torque machine in the autostart state comprises; operating the torque machine in a torque generation state, and operating the accessory brake to control accessory speed.
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15. A method for controlling operation of an internal combustion engine mechanically coupled via a planetary gear set to an accessory drive system and a torque machine, wherein the accessory drive system includes an accessory brake, the method comprising:
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monitoring operator inputs; monitoring engine operation parameters; selecting one of a plurality of operational states for operating the engine, the accessory drive system, and the torque machine in response to the operator inputs and the engine operation parameters, wherein the plurality of operational states comprises an autostop accessory control state, an autostart state, an engine torque assist state, and an energy power generation state; and operating the engine, the accessory drive system, and the torque machine in the selected operational state to control speed of accessories included in the accessory drive, wherein operating the engine, the accessory drive system, and the torque machine in the engine torque assist state comprises; monitoring operator commands, determining if an operator torque request exceeds a predetermined limit, determining if an energy storage device has power above a predetermined level, and operating the torque machine in the engine torque assist state when the operator torque request exceeds the predetermined limit and the energy storage device has power above the predetermined level, wherein the engine torque assist state comprises operating the torque machine in a torque generation state and operating the accessory brake to control accessory speed.
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Specification