Control system and method for synchronization control in dual clutch transmissions
View Patent ↗A control system includes a pressure control solenoid and a flow control solenoid having an input in fluid communication with the pressure control solenoid. A piston adjusts a position of a shift fork and includes a first area in fluid communication with the pressure control solenoid and a second area in fluid communication with the flow control solenoid. A fork sensor senses a position of a shift fork. A slip sensing module estimates slip acceleration between an input shaft and a gear. A flow determining module generates a flow command for the flow control solenoid. A sync control module determines a slip acceleration profile including an estimated slip acceleration, adjusts the estimated slip acceleration based on the measured slip acceleration, and generates a pressure command for the pressure control solenoid based on the adjusted slip acceleration.
1. A control system comprising:
a pressure control solenoid;
a flow control solenoid having an input in fluid communication with the pressure control solenoid;
a piston that adjusts a position of a shift fork of a dual clutch transmission and that includes a first area in fluid communication with the pressure control solenoid and a second area in fluid communication with the flow control solenoid;
a slip sensing module that estimates slip acceleration;
a flow determining module that generates a flow command for the flow control solenoid; and
a sync control module that determines a slip acceleration profile including an estimated slip acceleration, that adjusts the estimated slip acceleration based on a measured slip acceleration to generate an adjusted slip acceleration, and that generates a pressure command for the pressure control solenoid based on the adjusted slip acceleration.
2. The control system of claim 1 , wherein the sync control module includes a slip acceleration module that generates the slip acceleration profile based on an initial slip acceleration and a predetermined sync time.
3. The control system of claim 2 , wherein the sync control module further includes an error module that generates a slip acceleration error based on the estimated slip acceleration and the measured slip acceleration.
4. The control system of claim 3 , wherein the sync control module further includes a summing module that generates the adjusted slip acceleration based on the estimated slip acceleration and the slip acceleration error.
5. The control system of claim 4 , wherein the sync control module further includes a force converter module that generates a force command based on the adjusted slip acceleration.
6. The control system of claim 5 , wherein the sync control module further includes a pressure converter module that generates the pressure command based on the force command.
7. The control system of claim 1 , wherein the slip acceleration profile includes a first portion that ramps to a maximum value, a second portion that is constant at the maximum value, and a third portion that ramps towards zero at a first rate.
8. The control system of claim 1 , wherein the second area is larger than the first area.
9. The control system of claim 1 , wherein the shift fork is moved from a neutral position to a sync position.
10. The control system of claim 1 , wherein the flow command is a constant flow command during synchronization.