Method for synchronized transmission gear ratio engagement
First Claim
1. A method for changing a gear ratio in a transmission of a motor vehicle, comprising:
- commencing the gear ratio change by initiating engagement of a first gear-train component with a second gear-train component at a predetermined rate;
determining rotational speed of the first gear-train component;
determining rotational speed of the second gear-train component;
determining whether the rotational speed of the first gear-train component and the rotational speed of the second gear-train component have substantially synchronized;
reducing the rate of engagement of the first gear-train component with the second gear-train component if the rotational speed of the first gear-train component has not substantially synchronized with rotational speed of the second gear-train component;
increasing the rate of engagement of the first gear-train component with the second gear-train component if the rotational speed of the first gear-train component has substantially synchronized with rotational speed of the second gear-train component; and
completing the gear ratio change.
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Accused Products
Abstract
A method is provided for changing a gear ratio in a transmission of a motor vehicle. Engagement of a first gear-train component with a second gear-train component is initiated at a predetermined rate. Rotational speeds of the first and the second gear-train components, and whether the rotational speed of the first gear-train component and the rotational speed of the second gear-train component have substantially synchronized is determined. A rate of engagement of the two gear-train components is reduced, if the rotational speed of the first gear-train component has not substantially synchronized with rotational speed of the second gear-train component. The rate of engagement of the two gear-train components is increased, if the rotational speed of the first gear-train component has substantially synchronized with rotational speed of the second gear-train component. Following the conclusion of engagement between the two gear-train components, the gear ratio change is completed.
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Citations
19 Claims
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1. A method for changing a gear ratio in a transmission of a motor vehicle, comprising:
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commencing the gear ratio change by initiating engagement of a first gear-train component with a second gear-train component at a predetermined rate; determining rotational speed of the first gear-train component; determining rotational speed of the second gear-train component; determining whether the rotational speed of the first gear-train component and the rotational speed of the second gear-train component have substantially synchronized; reducing the rate of engagement of the first gear-train component with the second gear-train component if the rotational speed of the first gear-train component has not substantially synchronized with rotational speed of the second gear-train component; increasing the rate of engagement of the first gear-train component with the second gear-train component if the rotational speed of the first gear-train component has substantially synchronized with rotational speed of the second gear-train component; and completing the gear ratio change. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for controlling a multi-speed dual-clutch transmission comprising:
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holding a first clutch engaged, wherein a first transmission input member is coupled to a transmission output member while a second clutch engageable to couple a second transmission input member to the output member remains disengaged; commencing the gear ratio change by initiating engagement of a first gear-train component with a second gear-train component at a predetermined rate; determining rotational speed of the first gear-train component; determining rotational speed of the second gear-train component; determining whether the rotational speed of the first gear-train component and the rotational speed of the second gear-train component have substantially synchronized; reducing the rate of engagement of the first gear-train component with the second gear-train component if the rotational speed of the first gear-train component has not substantially synchronized with rotational speed of the second gear-train component; increasing the rate of engagement of the first gear-train component with the second gear-train component if the rotational speed of the first gear-train component has substantially synchronized with rotational speed of the second gear-train component to conclude engagement of the first gear-train component with the second gear-train component; and disengaging the first clutch and engaging the second clutch, whereby the second transmission input member is coupled to the output member. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for changing a gear ratio in a transmission having a first gear-train component and a second gear-train component, comprising:
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reducing the rate of engagement of the first gear-train component with the second gear-train component if the rotational speed of the first gear-train component has not substantially synchronized with rotational speed of the second gear-train component; increasing the rate of engagement of the first gear-train component with the second gear-train component if the rotational speed of the first gear-train component has substantially synchronized with rotational speed of the second gear-train component; and completing the gear ratio change.
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Specification