Hybrid electric vehicle sequence for engine start
First Claim
1. A method of operating a vehicular hybrid powertrain system having a first prime mover, a second prime mover, a planetary gear set configured to sum outputs from said first prime mover and said second prime mover, and a transmission coupled to an output of said planetary gear set comprising:
- initially driving said transmission with said second prime mover;
cranking said first prime mover;
accelerating said first prime mover to a reference speed; and
maintaining said first prime mover at approximately said reference speed while varying a speed of said second prime mover to vary an output velocity of said planetary gear set.
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Accused Products
Abstract
A method and system of operating a vehicular hybrid powertrain having a first prime mover, a second prime mover, a planetary gear set configured to sum outputs from the first prime mover and the second prime mover, and a transmission coupled to an output of the planetary gear set includes initially driving the transmission with the second prime mover, cranking the first prime mover with the second prime mover, accelerating the first prime mover to a reference speed, and maintaining the first prime mover at approximately the reference speed while varying a speed of the second prime mover to vary an output velocity of the planetary gear set
31 Citations
30 Claims
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1. A method of operating a vehicular hybrid powertrain system having a first prime mover, a second prime mover, a planetary gear set configured to sum outputs from said first prime mover and said second prime mover, and a transmission coupled to an output of said planetary gear set comprising:
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initially driving said transmission with said second prime mover;
cranking said first prime mover;
accelerating said first prime mover to a reference speed; and
maintaining said first prime mover at approximately said reference speed while varying a speed of said second prime mover to vary an output velocity of said planetary gear set. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A vehicular hybrid powertrain system, comprising:
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a first prime mover having an output;
a second prime mover having an output;
a synchronizing clutch selectively coupling said first prime mover output and said second prime mover output;
a multi-ratio transmission having an input; and
a planetary gear set operatively coupling said second prime mover output to said first prime mover output or said multi-ratio transmission input based on a coupling state of said synchronizing clutch;
wherein said hybrid powertrain system is configured to initially drive said transmission with said second prime mover, crank said first prime mover, accelerate said first prime mover to a reference speed, and maintain said first prime mover at approximately said reference speed while varying a speed of said second prime mover to vary an output velocity of said planetary gear set. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of operating a vehicular hybrid powertrain system, comprising:
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providing a first prime mover having an output, a second prime mover having an output, a transmission having an input, and a planetary gear set selectively coupling said second prime mover output to said first prime mover output and to said transmission input based on a coupling state of said synchronizing clutch;
rotating the output of said second prime mover to drive rotation of said multi-ratio transmission input in a first-gear-ratio;
initiating an auto shift event;
cranking said first prime mover during said auto shift event;
accelerating a rotational velocity of said first prime mover to a desired velocity during said auto shift event; and
re-engaging said first-gear ratio. - View Dependent Claims (23, 24, 25, 26)
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27. A method of operating a vehicular hybrid powertrain system, comprising:
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providing a first prime mover having an output, a second prime mover having an output, a transmission having an input, and a planetary gear set selectively coupling said second prime mover output to said first prime mover output and to said transmission input based on a coupling state of said synchronizing clutch;
rotating the output of said second prime mover to drive rotation of said multi-ratio transmission input;
initiating an auto shift event;
cranking said first prime mover during said auto shift event; and
accelerating a rotational velocity of said first prime mover to a desired velocity using said second prime mover output during said auto shift event. - View Dependent Claims (28, 29, 30)
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Specification