Countershaft automatic gearbox, in particular an automatic gearbox for motor vehicles
First Claim
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1. An automatically shiftable countershaft transmission for a vehicle, comprising:
- a transmission housing;
a gear system within said housing having a plurality of gear ratios for transmitting a dynamic load and a gear step comprising a shift from a first one of said ratios to a second one of said ratios;
synchronizing means for synchronizing said gear system;
shifting means for actuating said synchronizing means over a shift travel through a plurality of shift phases when shifting said gear system to one of said gear ratios;
a servo for applying a shift force for actuating said shifting means;
a sensor for detecting a position of said servo means and generating a servo position signal in response thereto; and
a computer for receiving said servo position signal from said sensor and varying said shift force as a function of gear step and dynamic load when shifting said gear system through said gear step.
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Abstract
In an automatically shiftable countershaft transmission, particularly for motor vehicles, the shift travels between the engagement points are established and the shift force may be varied as a function of gear step and dynamic load over the engagement travel. Depending on the functional phase, a lower force is provided during the synchronization phase, a higher force is provided during the shift-through phase and a lower force is provided during the dog-in phase.
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Citations
20 Claims
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1. An automatically shiftable countershaft transmission for a vehicle, comprising:
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a transmission housing; a gear system within said housing having a plurality of gear ratios for transmitting a dynamic load and a gear step comprising a shift from a first one of said ratios to a second one of said ratios; synchronizing means for synchronizing said gear system; shifting means for actuating said synchronizing means over a shift travel through a plurality of shift phases when shifting said gear system to one of said gear ratios; a servo for applying a shift force for actuating said shifting means; a sensor for detecting a position of said servo means and generating a servo position signal in response thereto; and a computer for receiving said servo position signal from said sensor and varying said shift force as a function of gear step and dynamic load when shifting said gear system through said gear step. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An automatically shiftable countershaft transmission for a vehicle, comprising:
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a transmission housing; a gear system within said housing having a plurality of gear ratios for transmitting a dynamic load and a gear step comprising a shift from a first one of said ratios to a second one of said ratios; synchronizing means for synchronizing said gear system; shifting means for actuating said synchronizing means over a shift travel through a plurality of shift phases when shifting said gear system to one of said gear ratios; a servo for applying a shift force for actuating said shifting means; a sensor for detecting a position of said servo and generating a servo position signal in response thereto; a computer for receiving said servo position signal from said sensor and varying said shift force as a function of gear step and dynamic load when shifting said gear system through said gear step; an electronically controlled throttle and a throttle computer for controlling said throttle, said throttle computer modulating said throttle as a function of dynamic load, said throttle control computer lowering the dynamic load prior to entering one of said shift phases and increasing said dynamic load after said one of said shift phases is exited; and an automatic clutch control means for providing a zero torque window as a function of dynamic load factor during execution of said one of said shift phases, said clutch control means providing a larger zero torque window when said dynamic load factor is low and a smaller zero torque window when said dynamic load factor is high. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification