# US 2019/0168762 A1 · Shift control method for rapidly accelerating dct vehicle

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- Number: US 2019/0168762 A1
- Document ID: US20190168762A1
- Status: Published application
- Kind: A1
- Application number: 16/003,593
- Filed: 2018-06-08
- Published: 2019-06-06
- Earliest claimed: 2017-12-04
- Assignees: Hyundai Motor Company; Kia Motors Corporation
- Applicants: Hyundai Motor Company; Kia Motors Corporation
- Inventors: Sung Hyun Cho
- Web page: https://patentgrep.com/patent/US20190168762A1

## CPC

- B60W 30/18027: {Drive off, accelerating from standstill}
- F16H 61/0437: {by using electrical signals (F16H61/0403 and F16H61/061 take precedence)}
- B60W 10/02: including control of driveline clutches
- B60W 10/06: including control of combustion engines
- B60W 10/11: Stepped gearings
- B60W 50/0097: {Predicting future conditions}
- F16H 61/08: Timing control
- F16H 61/688: with two inputs, e.g. selection of one of two torque-flow paths by clutches
- B60W 2050/004: {of the clutch}
- B60W 2510/0275: Clutch torque
- B60W 2510/0638: Engine speed
- B60W 2540/10: Accelerator pedal position
- B60W 2710/021: Clutch engagement state
- B60W 2710/0666: Engine torque
- B60W 2710/1005: Transmission ratio engaged
- F16H 2061/166: {Preventing or initiating shifts for preventing stall or overspeed of engine}
- B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- F16H: GEARING

## Abstract

A shift control method for a rapidly accelerating DCT vehicle, may include determining, by a controller, whether or not there occurs a power-on upshift situation in which an accelerator pedal is depressed 50% or more; estimating, by the controller, a predicted time remaining until an engine speed enters a red zone when engagement of a target shift-stage gear is completed under the power-on upshift situation; and performing, by the controller, a torque phase by updating a predetermined target torque phase time to fall within the predicted time when the predicted time is less than the target torque phase time and controlling a disengaging clutch and an engaging clutch depending on the updated target torque phase time.

## Claims

### Claim 1

A shift control method for accelerating a dual-clutch-transmission (DCT) vehicle, the method comprising:
determining, by a controller, whether there occurs a power-on upshift situation in which an accelerator pedal is depressed 50% or more;
estimating, by the controller, a predicted time remaining until an engine speed enters a red zone after engagement of a target shift-stage gear is completed under the power-on upshift situation; and
performing, by the controller, a torque phase to the DCT by updating a predetermined target torque phase time to fall within the predicted time when the predicted time is less than the target torque phase time and controlling a disengaging clutch and an engaging clutch depending on the updated target torque phase time.

### Claim 2 (depends on 1)

The method according to claim 1, further including performing an inertia phase to reduce an engine torque and synchronize the engine speed with a target shift-stage input shaft speed to complete shifting after the performing of the torque phase is completed.

### Claim 3 (depends on 1)

The method according to claim 1, wherein, in the estimating of the predicted time, the predicted time is estimated using an engine angular acceleration, a current engine speed, and a red-zone lower-limit speed.

### Claim 4 (depends on 3)

The method according to claim 3, wherein, in the estimating of the predicted time, a time taken until the current engine speed increases by a current engine angular acceleration and reaches a margin consideration speed, which is lower than the red-zone lower-limit speed by a predetermined margin range, is determined as the predicted time.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the controller is configured to update the predetermined target torque phase time to a value obtained by subtracting a predetermined margin time from the predicted time in the performing of the torque phase.

### Claim 6 (depends on 1)

The method according to claim 1, wherein, in the performing of the torque phase, the controller is configured to control the disengaging clutch and the engaging clutch using a disengaging clutch torque and an engaging clutch torque determined by an equation:
Disengaging Clutch Torque(t)=Disengaging Clutch Torque(t−1)−(Disengaging Clutch Torque(t−1)−Touch Point Torque)/(Target Torque Phase Time-Elapsed Torque Phase Time)
Engaging Clutch Torque(t)=Engaging Clutch Torque(t−1)+(Target Torque-Engaging Clutch Torque(t−1))/(Target Torque Phase Time-Elapsed Torque Phase Time)
wherein, the target torque=target engine torque+Je*dNe/dt,
Je: engine rotation inertial moment, and Ne: engine speed.