System and method for controlling unpowered to powered transitions in vehicles having dry dual clutch transmissions
View Patent ↗A control system for a vehicle having a dry dual clutch transmission (DCT) includes a launch condition detection module, a vehicle stop module, and a vehicle launch module. The launch condition detection module detects a launch condition based on whether (i) the vehicle is on an uphill grade and (ii) a driver of the vehicle has requested power via an accelerator. The vehicle stop module stops the vehicle when the launch condition is detected by (i) commanding an on-coming clutch of the dry DCT to a predetermined position and (ii) applying brakes of the vehicle. The vehicle launch module launches the vehicle after the vehicle is stopped by (i) fully engaging the on-coming clutch of the dry DCT and (ii) opening a throttle to a desired position corresponding to the power request.
1. A control system for a vehicle having a dry dual clutch transmission (DCT), the control system comprising:
a launch condition detection module that detects a launch condition based on whether (i) the vehicle is on an uphill grade and (ii) a driver of the vehicle has requested power via an accelerator;
a vehicle stop module that stops the vehicle when the launch condition is detected by (i) commanding an on-coming clutch of the dry DCT to a predetermined position and (ii) applying brakes of the vehicle; and
a vehicle launch module that launches the vehicle after the vehicle is stopped by (i) fully engaging the on-coming clutch of the dry DCT and (ii) opening a throttle to a desired position corresponding to the power request.
2. The control system of claim 1 , wherein the vehicle stop module applies the brakes of the vehicle according to a cubic velocity path.
3. The control system of claim 2 , wherein applying the brakes of the vehicle according to the cubic velocity path includes a parabolic application of brake torque.
4. The control system of claim 1 , wherein the vehicle stop module applies the brakes of the vehicle according to a half-parabolic velocity path.
5. The control system of claim 4 , wherein applying the brakes of the vehicle according to the half-parabolic velocity path includes a linear application of brake torque.
6. The control system of claim 1 , wherein the predetermined position of the on-coming clutch is a kiss point, and wherein the vehicle stop module commands the on-coming clutch of the dry DCT from a pre-kiss point to the kiss point.
7. The control system of claim 1 , wherein the launch condition detection module detects the launch condition further based on whether the brakes of the vehicle are fully applied.
8. The control system of claim 7 , wherein the launch condition detection module detects the launch condition when the brakes of the vehicle are not fully applied.
9. The control system of claim 1 , wherein the vehicle stop module stops the vehicle by slowing the vehicle to a predetermined speed.
10. The control system of claim 9 , wherein the predetermined speed is zero miles per hour.
11. A method for controlling a vehicle having a dry dual clutch transmission (DCT), the method comprising:
detecting a launch condition based on whether (i) the vehicle is on an uphill grade and (ii) a driver of the vehicle has requested power via an accelerator;
stopping the vehicle when the launch condition is detected by (i) commanding an on-coming clutch of the dry DCT to a predetermined position and (ii) applying brakes of the vehicle; and
launching the vehicle after the vehicle is stopped by (i) fully engaging the on-coming clutch of the dry DCT and (ii) opening a throttle to a desired position corresponding to the power request.
12. The method of claim 11 , further comprising applying the brakes of the vehicle according to a cubic velocity path.
13. The method of claim 12 , wherein applying the brakes of the vehicle according to the cubic velocity path includes a parabolic application of brake torque.
14. The method of claim 11 , further comprising applying the brakes of the vehicle according to a half-parabolic velocity path.
15. The method of claim 14 , wherein applying the brakes of the vehicle according to the half-parabolic velocity path includes a linear application of brake torque.
16. The method of claim 11 , wherein the predetermined position of the on-coming clutch is a kiss point, and further comprising commanding the on-coming clutch of the dry DCT from a pre-kiss point to the kiss point.
17. The method of claim 11 , further comprising detecting the launch condition further based on whether the brakes of the vehicle are fully applied.
18. The method of claim 17 , further comprising detecting the launch condition when the brakes of the vehicle are not fully applied.
19. The method of claim 11 , further comprising stopping the vehicle by slowing the vehicle to a predetermined speed.
20. The method of claim 19 , wherein the predetermined speed is zero miles per hour.