Control system and method for a hybrid electric vehicle
First Claim
1. In a hybrid electric vehicle powertrain including an engine, a motor/generator, a transmission coupled at an input thereof to receive torque from said engine and said motor/generator coupled to augment torque provided by said engine, an energy storage device coupled to receive energy from and provide energy to said motor/generator and a vehicle system controller (VSC) adapted to control said powertrain, a method for controlling said powertrain comprising:
- providing an accelerator position signal to said VSC;
in said VSC, calculating a first desired electric machine torque to reflect a driver-commanded boost or regenerative torque, said first desired electric machine torque being a function of said accelerator position signal;
controlling output torque of said engine at least partly as a function of said accelerator position signal;
in said VSC, calculating a second desired electric machine torque to reflect a battery-charge-maintenance torque; and
controlling said electric machine in view of said first desired electric machine torque and said second desired electric machine torque.
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Accused Products
Abstract
Several control methods are presented for application in a hybrid electric vehicle powertrain including in various embodiments an engine, a motor/generator, a transmission coupled at an input thereof to receive torque from the engine and the motor generator coupled to augment torque provided by the engine, an energy storage device coupled to receive energy from and provide energy to the motor/generator, an engine controller (EEC) coupled to control the engine, a transmission controller (TCM) coupled to control the transmission and a vehicle system controller (VSC) adapted to control the powertrain.
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Citations
21 Claims
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1. In a hybrid electric vehicle powertrain including an engine, a motor/generator, a transmission coupled at an input thereof to receive torque from said engine and said motor/generator coupled to augment torque provided by said engine, an energy storage device coupled to receive energy from and provide energy to said motor/generator and a vehicle system controller (VSC) adapted to control said powertrain, a method for controlling said powertrain comprising:
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providing an accelerator position signal to said VSC;
in said VSC, calculating a first desired electric machine torque to reflect a driver-commanded boost or regenerative torque, said first desired electric machine torque being a function of said accelerator position signal;
controlling output torque of said engine at least partly as a function of said accelerator position signal;
in said VSC, calculating a second desired electric machine torque to reflect a battery-charge-maintenance torque; and
controlling said electric machine in view of said first desired electric machine torque and said second desired electric machine torque. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
providing a first signal from said VSC to said EEC to reflect a driver-commanded boost or regenerative torque of said electric machine; and
providing a second signal from said VSC to said EEC to reflect a battery-charge maintenance torque of said electric machine.
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3. A method as recited in claim 2, further comprising:
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generating a first desired engine torque signal as a function of said accelerator position signal; and
generating a second desired engine torque signal as a function of said first desired engine torque signal and said second signal.
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4. A method as recited in claim 3, wherein said powertrain further includes a transmission controller (TCM) coupled to control said transmission, said method further comprising:
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if a transmission shift event is impending or in progress, providing a TCM-desired transmission input torque signal from said TCM to said EEC;
in said EEC, partitioning said TCM-desired transmission input torque signal into a TCM-desired engine torque signal and a TCM-desired electric machine torque signal.
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5. A method as recited in claim 4, further comprising:
controlling output torque of said engine in view of said first desired engine control signal and said TCM-desired engine torque signal.
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6. A method as recited in claim 5, further comprising:
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providing said TCM-desired electric machine torque signal from said EEC to said VSC;
controlling said electric machine in view of said first desired electric machine torque, said second desired electric machine torque and said TCM-desired electric machine torque signal.
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7. A method as recited in claim 6, further comprising:
providing a third signal from the EEC to the TCM to reflect a target input torque to said transmission, said target input torque to said transmission being a sum of said driver-commanded boost or regenerative torque, and said second desired engine torque signal.
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8. A method as recited in claim 7, further comprising:
providing a fourth signal from the EEC to the TCM to reflect a sum of a total engine output torque and said boost or regenerative torque.
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9. In a hybrid electric vehicle powertrain including an engine, a motor/generator, a transmission coupled at an input thereof to receive torque from said engine and said motor/generator coupled to augment torque provided by said engine, an energy storage device coupled to receive energy from and provide energy to said motor/generator, an engine controller (EEC) coupled to control said engine and a vehicle system controller (VSC) adapted to control said powertrain, a method for controlling said powertrain comprising:
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providing an accelerator position signal to said VSC;
in said VSC, calculating a first desired electric machine torque to reflect a driver-commanded boost or regenerative torque, said first desired electric machine torque being a function of said accelerator position signal;
providing a modified accelerator position signal from said VSC to said EEC, said modified accelerator position signal reaching 100% before said first accelerator position signal; and
controlling output torque of said engine at least partly as a function of said modified accelerator position signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
in said VSC, calculating a second desired electric machine torque to reflect a battery-charge-maintenance torque; and
controlling said electric machine in view of said first desired electric machine torque and said second desired electric machine torque.
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11. A method as recited in claim 10, further comprising:
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providing a first signal from said VSC to said EEC to reflect a driver-commanded boost or regenerative torque of said electric machine; and
providing a second signal from said VSC to said EEC to reflect a battery-charge maintenance torque of said electric machine.
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12. A method as recited in claim 11, further comprising:
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generating a first desired engine torque signal as a function of said modified accelerator position signal; and
generating a second desired engine torque signal as a function of said first desired engine torque signal and said second signal.
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13. A method as recited in claim 12, wherein said powertrain further includes a transmission controller (TCM) coupled to control said transmission, said method further comprising:
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if a transmission shift event is impending or in progress, providing a TCM-desired transmission input torque signal from said TCM to said EEC;
in said EEC, partitioning said TCM-desired transmission input torque signal into a TCM-desired engine torque signal and a TCM-desired electric machine torque signal.
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14. A method as recited in claim 13, further comprising:
controlling output torque of said engine in view of said first desired engine control signal and said TCM-desired engine torque signal.
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15. A method as recited in claim 14, further comprising:
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providing said TCM-desired electric machine torque signal from said EEC to said VSC;
controlling said electric machine in view of said first desired electric machine torque, said second desired electric machine torque and said TCM-desired electric machine torque signal.
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16. A method as recited in claim 15, further comprising:
providing a third signal from the EEC to the TCM to reflect a target input torque to said transmission, said target input torque to said transmission being a sum of said driver-commanded boost or regenerative torque, and said second desired engine torque signal.
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17. A method as recited in claim 16, further comprising:
providing a fourth signal from the EEC to the TCM to reflect a sum of a total engine output torque and said boost or regenerative torque.
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18. In a hybrid electric vehicle powertrain including an engine, a motor/generator, a transmission coupled at an input thereof to receive torque from said engine and said motor/generator coupled to augment torque provided by said engine, an energy storage device coupled to receive energy from and provide energy to said motor/generator, an electronic engine controller (EEC coupled to control said engine and a transmission controller (TCM) coupled to control said transmission, a method for controlling said powertrain comprising:
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providing a signal from said EEC to said TCM to reflect a sum of an actual or estimated electric machine torque and an actual or estimated engine output torque;
providing a signal from said TCM to said EEC to reflect a TCM-commanded transmission input torque;
partitioning said TCM-commanded transmission input torque signal into a TCM-commanded engine torque signal and a TCM-commanded electric machine torque signal. - View Dependent Claims (19, 20, 21)
in said VSC, calculating a first desired electric machine torque to reflect a driver-commanded boost or regenerative torque;
in said VSC, calculating a second desired electric machine torque to reflect a battery-charge-maintenance torque; and
controlling said electric machine in view of said first desired electric machine torque, said second desired electric machine torque and said TCM-commanded electric machine torque signal.
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21. A method as recited in claim 20, wherein, when a transmission shift is impending or is in progress, said TCM-commanded electric machine torque signal overrrides at least said first desired electric machine torque.
Specification