Method for regulating garage shifts
First Claim
1. A method for shifting a transmission of a motor vehicle, the transmission having a plurality of planetary gear sets, each of the planetary gear sets having first, second, and third members, the method comprising shifting into first gear from one of a reverse gear and neutral, the motor vehicle operable to be propelled in a forward direction in first gear and in a rearward direction in the reverse gear, the method comprising the following steps:
- applying a torque transmitting mechanism to interconnect a first member of the plurality of planetary gear sets with another of the first, second, and third members or a stationary member, wherein when the motor vehicle is being propelled in first gear or the reverse gear, the torque transmitting mechanism is not applied;
after the torque transmitting mechanism is applied, applying a high gain clutch to interconnect a second member of the plurality of planetary gear sets with another of the first, second, and third members or the stationary member, the high gain clutch being one of a dog clutch and a band clutch; and
after the high gain clutch is applied, releasing the torque transmitting mechanism.
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Accused Products
Abstract
A method is provided for shifting a transmission having an input member, an output member, at least four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. At least one of the torque transmitting devices is a dog clutch or a band clutch. The method includes applying a torque transmitting mechanism to interconnect a first member of a planetary gear set with another member of a planetary gear set or a stationary member. The method also includes applying the dog clutch or band clutch to interconnect a second member of a planetary gear set with another member of a planetary gear set or the stationary member, after the first torque transmitting mechanism is applied. After the dog or band clutch is applied, the torque transmitting mechanism is released.
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Citations
24 Claims
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1. A method for shifting a transmission of a motor vehicle, the transmission having a plurality of planetary gear sets, each of the planetary gear sets having first, second, and third members, the method comprising shifting into first gear from one of a reverse gear and neutral, the motor vehicle operable to be propelled in a forward direction in first gear and in a rearward direction in the reverse gear, the method comprising the following steps:
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applying a torque transmitting mechanism to interconnect a first member of the plurality of planetary gear sets with another of the first, second, and third members or a stationary member, wherein when the motor vehicle is being propelled in first gear or the reverse gear, the torque transmitting mechanism is not applied; after the torque transmitting mechanism is applied, applying a high gain clutch to interconnect a second member of the plurality of planetary gear sets with another of the first, second, and third members or the stationary member, the high gain clutch being one of a dog clutch and a band clutch; and after the high gain clutch is applied, releasing the torque transmitting mechanism. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for shifting a transmission of a motor vehicle, the transmission having a plurality of planetary gear sets, each of the planetary gear sets having first, second, and third members, the method comprising:
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applying a torque transmitting mechanism to interconnect a first member of the plurality of planetary gear sets with another of the first, second, and third members or a stationary member; after the torque transmitting mechanism is applied, applying a high gain clutch to interconnect a second member of the plurality of planetary gear sets with another of the first, second, and third members or the stationary member, the high gain clutch being one of a dog clutch and a band clutch; and after the high gain clutch is applied, releasing the torque transmitting mechanism, wherein the first and second members are provided as elements of a first planetary gear set of the plurality of planetary gear sets, and wherein the torque transmitting mechanism is provided as a first brake and the step of applying the torque transmitting mechanism includes interconnecting the first member of the first planetary gear set with the stationary member; and
wherein the high gain clutch is provided as a second brake and the step of applying the high gain clutch includes interconnecting the second member of the first planetary gear set with the stationary member, the method further comprising;applying a third brake prior to the step of applying the high gain clutch; and after the step of applying the high gain clutch, releasing the third brake. - View Dependent Claims (14, 15)
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16. A method for shifting a transmission of a motor vehicle, the transmission having a plurality of planetary gear sets, each of the planetary gear sets having first, second, and third members, the method comprising:
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applying a torque transmitting mechanism to interconnect a first member of the plurality of planetary gear sets with another of the first, second, and third members or a stationary member; after the torque transmitting mechanism is applied, applying a high gain clutch to interconnect a second member of the plurality of planetary gear sets with another of the first, second, and third members or the stationary member, the high gain clutch being one of a dog clutch and a band clutch; and after the high gain clutch is applied, releasing the torque transmitting mechanism, wherein the first and second members are provided as elements of a first planetary gear set of the plurality of planetary gear sets, and wherein the torque transmitting mechanism is provided as a first brake and the step of applying the torque transmitting mechanism includes interconnecting the first member of the first planetary gear set with the stationary member; and
wherein the high gain clutch is provided as a second brake and the step of applying the high gain clutch includes interconnecting the second member of the first planetary gear set with the stationary member, the method further comprising braking the motor vehicle prior to applying the second brake. - View Dependent Claims (17)
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18. A method for shifting a transmission of a motor vehicle, the transmission having a plurality of planetary gear sets, each of the planetary gear sets having first, second, and third members, the method comprising:
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applying a torque transmitting mechanism to interconnect a first member of the plurality of planetary gear sets with another of the first, second, and third members or a stationary member; after the torque transmitting mechanism is applied, applying a high gain clutch to interconnect a second member of the plurality of planetary gear sets with another of the first, second, and third members or the stationary member, the high gain clutch being one of a dog clutch and a band clutch; and after the high gain clutch is applied, releasing the torque transmitting mechanism, wherein the first and second members are provided as elements of a first planetary gear set of the plurality of planetary gear sets, and wherein the torque transmitting mechanism is provided as a first brake and the step of applying the torque transmitting mechanism includes interconnecting the first member of the first planetary gear set with the stationary member; and
wherein the high gain clutch is provided as a second brake and the step of applying the high gain clutch includes interconnecting the second member of the first planetary gear set with the stationary member, the method further comprising providing;an input member; an output member; a first interconnecting member continuously interconnecting a first member of a fourth planetary gear set of the plurality of planetary gear sets with a second member of a second planetary gear set of the plurality of planetary gear sets; a second interconnecting member continuously interconnecting a second member of the fourth planetary gear set with a third member of a third planetary gear set of the plurality of planetary gear sets; a third interconnecting member continuously interconnecting a third member of the fourth planetary gear set with the second member of the first planetary gear set; a fourth interconnecting member continuously interconnecting a first member of the second planetary gear set with a third member of the first planetary gear set; a fifth interconnecting member continuously interconnecting a third member of the second planetary gear set with a second member of the third planetary gear set; and a first clutch, a second clutch, a third brake, and a fourth brake, wherein the first, second, third and fourth brakes and the first and second clutches are each selectively engageable to interconnect at least one of the first, second, and third members with at least one other of the first, second, third members and the stationary member, wherein the first, second, third, and fourth brakes and the first and second clutches are selectively engageable in combinations of at least two to establish at least ten forward speed ratios and at least one reverse speed ratio between the input member and the output member. - View Dependent Claims (19)
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20. A method for shifting a transmission of a motor vehicle, the transmission having a plurality of planetary gear sets, each of the planetary gear sets having first, second, and third members, the method comprising:
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applying a torque transmitting mechanism to interconnect a first member of the plurality of planetary gear sets with another of the first, second, and third members or a stationary member; after the torque transmitting mechanism is applied, applying a high gain clutch to interconnect a second member of the plurality of planetary gear sets with another of the first, second, and third members or the stationary member, the high gain clutch being one of a dog clutch and a band clutch; after the high gain clutch is applied, releasing the torque transmitting mechanism; determining an actual speed of the second member; comparing an absolute value of the actual speed of the second member to a predetermined upper threshold; if the absolute value of the actual speed of the second member exceeds the predetermined upper threshold, adjusting fluid pressure applied to the torque transmitting mechanism; and if the absolute value of the actual speed of the second member is less than or equal to the predetermined upper threshold, executing the step of applying the high gain clutch. - View Dependent Claims (21, 22)
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23. A method for shifting a transmission having a plurality of planetary gear sets, each of the planetary gear sets having first, second, and third members, the method comprising:
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applying a torque transmitting mechanism to interconnect a first member of the plurality of planetary gear sets with another of the first, second, and third members or a stationary member; determining an actual speed of a second member of the plurality of planetary gear sets; comparing an absolute value of the actual speed of the second member to a predetermined upper threshold; if the absolute value of the actual speed of the second member exceeds the predetermined upper threshold, adjusting fluid pressure applied to the torque transmitting mechanism; repeating the step of determining the actual speed of the second member, the step of comparing the absolute value of the actual speed of the second member to the predetermined upper threshold, and the step of adjusting the fluid pressure applied to the torque transmitting mechanism until the absolute value of the actual speed of the second member drops below or equals the predetermined upper threshold; if the absolute value of the actual speed of the second member is less than or equal to the predetermined upper threshold, applying a high gain clutch to interconnect the second member with another of the first, second, and third members or the stationary member while the torque transmitting mechanism is applied, the high gain clutch being one of a dog clutch and a band clutch; and after the high gain clutch is applied, releasing the torque transmitting mechanism. - View Dependent Claims (24)
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Specification