Torque control system for a hybrid vehicle with an automatic transmission
First Claim
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1. A method of controlling a powertrain for a hybrid vehicle, the method comprising:
- providing an internal combustion engine;
providing a motor generator operatively coupled to said internal combustion engine;
providing an automatic transmission operatively coupled to said internal combustion engine; and
actuating said motor generator to a certain speed to prime said automatic transmission.
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Abstract
A method of controlling a powertrain for a hybrid vehicle, the method including providing an internal combustion engine, providing a motor generator operatively coupled to the internal combustion engine, providing an automatic transmission operatively coupled to the internal combustion engine, and actuating the motor generator to a certain speed to restart the vehicle.
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Citations
21 Claims
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1. A method of controlling a powertrain for a hybrid vehicle, the method comprising:
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providing an internal combustion engine;
providing a motor generator operatively coupled to said internal combustion engine;
providing an automatic transmission operatively coupled to said internal combustion engine; and
actuating said motor generator to a certain speed to prime said automatic transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12)
decelerating the vehicle to a drop-to-neutral speed by placing said automatic transmission in a low gear;
maintaining a coasting condition by freewheeling said automatic transmission;
decelerating under said coasting condition; and
restarting said internal combustion engine using said motor generator when said accelerator pedal is depressed or said brake pedal is released.
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7. The method of claim 1 further comprising the steps of:
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starting said internal combustion engine; and
controlling the torque of said internal combustion engine to blend with the torque of said motor-generator, whereby driveability of the hybrid vehicle is controlled.
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8. The method of claim 1 wherein the step of controlling the torque of said internal combustion engine to blend with the torque of said motor generator comprises:
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monitoring a throttle position for said internal combustion engine;
monitoring an accelerator pedal position;
monitoring brake pressure;
controlling fuel injectors;
controlling spark advance and retard;
controlling said throttle position; and
controlling torque converter clutch application.
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9. The method of claim 8 further comprising the step of monitoring a brake light switch.
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10. The method of claim 1 wherein said step of priming said automatic transmission comprises actuating a torque converter coupled to said automatic transmission to allow the transfer of torque through said torque converter to said automatic transmission.
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12. The hybrid vehicle powertrain system of claim 10 wherein said controller is electrically coupled to said throttle position sensor, said pedal position sensor, and said manifold pressure sensor.
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11. A hybrid vehicle powertrain system comprising:
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an internal combustion engine having a crankshaft;
an automatic transmission having a torque converter coupled to said crankshaft;
a motor generator coupled to said crankshaft;
a throttle position sensor for detecting the position of a throttle plate operatively coupled to said internal combustion engine;
a pedal position sensor for detecting the position of an accelerator pedal located within the hybrid vehicle;
a manifold pressure sensor located in said internal combustion engine; and
at least one controller for controlling said internal combustion engine and said motor-generator, said controller including software to control said motor-generator to actuate said torque converter. - View Dependent Claims (13, 14, 15, 17, 18, 19, 20, 21)
a motor-generator controller controlling said motor generator; and
an engine controller for controlling said internal combustion engine.
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17. The method of claim 15 further comprising the step of measuring a brake release value to determine when to actuate said motor generator.
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18. The method of claim 15 wherein the step of actuating said internal combustion engine by actuating said motor generator comprises generating a torque command to said motor generator sufficient to break said internal combustion engine loose from friction.
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19. The method of claim 15 further comprising the step of measuring the speed of a crankshaft of said internal combustion engine.
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20. The method of claim 15 wherein the step of starting said internal combustion method comprises phasing in fuel and spark control for said internal combustion engine as torque for said motor generator is reduced.
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21. The method of claim 15 wherein the step of starting said internal combustion method comprises:
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measuring the manifold pressure of said internal combustion engine;
measuring the position of an accelerator pedal;
measuring the position of a throttle plate operatively coupled to said internal combustion engine;
controlling said throttle plate position at impending engine crankshaft rotation;
measuring the speed of said internal combustion engine;
sequentially firing fuel injectors in response to a measured engine speed;
controlling spark retard as a function of measured manifold pressure; and
controlling said throttle plate position as a function of the firing of said fuel injectors.
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16. A method of starting a hybrid vehicle equipped with an automatic transmission, the method comprising:
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providing an internal combustion engine in the hybrid vehicle;
providing a motor generator coupled to said internal combustion engine;
providing an automatic transmission having a torque converter coupled to said internal combustion engine;
actuating said internal combustion engine by actuating said motor generator, whereby said torque converter is actuated and primed; and
starting said internal combustion engine.
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Specification