Gear preselect systems for a dual clutch transmission
AssigneeGM Global Technology Operations LLC
InventorsXuefeng Tim Tao, Donald D. Crites
Life of this patent
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Abstract
A dual-clutch transmission (DCT) system includes a vehicle speed offset module that generates a vehicle speed offset signal based on a preselect time and a vehicle acceleration signal. A compensated vehicle speed module generates a compensated vehicle speed based on the vehicle speed offset signal and a vehicle speed. A preselect command module generates a predicted gear signal based on a comparison between the compensated vehicle speed and a shift point from a shift pattern module. The predicted gear signal, identifies a first predicted gear of a DCT. The preselect time is defined as at least an amount of time to disengage a second predicted gear and preengage the first predicted gear.
Claims18
A dual-clutch transmission (DCT) system comprising:
- a vehicle speed offset module that generates a vehicle speed offset signal based on a preselect time and a vehicle acceleration signal;
- a compensated vehicle speed module that generates a compensated vehicle speed based on the vehicle speed offset signal and a vehicle speed;
- a shift determining module that compares the compensated vehicle speed to a shift point;
- and
- a preselect command module that generates a predicted gear signal based on the comparison between the compensated vehicle speed and the shift point, wherein the predicted gear signal identifies a first predicted gear of a DCT, and
- wherein the preselect time is defined as at least an amount of time to disengage a second predicted gear and preengage the first predicted gear.
A method of operating a dual-clutch transmission (DCT) system comprising:
- generating a vehicle speed offset signal at a control module based on a preselect time and a vehicle acceleration signal;
- generating a compensated vehicle speed via the control module and based on the vehicle speed offset signal and a vehicle speed;
- via the control module, comparing the compensated vehicle speed and a shift point;
- and
- via the control module, generating a predicted gear signal based on the comparison between the compensated vehicle speed and the shift point, wherein the predicted gear signal identifies a first predicted gear of a DCT, and
- wherein the preselect time is defined as at least an amount of time to disengage a second predicted gear and preengage the first predicted gear.
Dependencies are inferred from the claim text.