# US 9,663,107 B2 · Launch control method for vehicle with dry-type clutch

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- Number: US 9,663,107 B2
- Document ID: US9663107B2
- Status: Granted
- Kind: B2
- Application number: 15/050,936
- Filed: 2016-02-23
- Published: 2017-04-06
- Granted: 2017-05-30
- Earliest claimed: 2015-10-01
- Assignees: Hyundai Motor Company; Kia Motors Corporation
- Applicants: Hyundai Motor Company; Kia Motors Corporation
- Inventors: Jin Sung Kim
- Web page: https://patentgrep.com/patent/US9663107B2

## CPC

- B60W 30/18027: {Drive off, accelerating from standstill}
- B60W 10/02: including control of driveline clutches
- B60W 10/06: including control of combustion engines
- B60W 30/1884: {Avoiding stall or overspeed of the engine}
- B60W 2050/001: {Proportional integral [PI] controller}
- B60W 2050/0011: {Proportional Integral Differential [PID] controller}
- B60W 2050/0012: {Feedforward or open loop systems}
- B60W 2510/0275: Clutch torque
- B60W 2510/0652: Speed change rate
- B60W 2510/0657: Engine torque
- B60W 2510/0695: Inertia
- B60W 2540/10: Accelerator pedal position
- B60W 2710/022: Clutch actuator position
- B60W 2710/027: Clutch torque
- B60W 2710/0644: Engine speed
- B60Y 2300/18025: Drive off, accelerating from standstill
- 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
- B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY

## Abstract

A launch control method for a vehicle with a dry-type clutch includes: determining a target engine speed corresponding to an operation amount of an accelerator pedal of the vehicle when vehicle launch is started by operation of the accelerator pedal; calculating a feedforward component which is part of the torque to control the clutch using a rate of change over time of the target engine speed and a current engine torque; calculating a feedback component which is part of the torque to control the clutch based on a difference between the target engine speed and the current engine speed; calculating a compensation torque using a current engine torque and an estimated clutch torque which is estimated to be currently transferred by the clutch; and controlling a clutch actuator to drive the clutch with a sum of the feedforward component, the feedback component, and the compensation torque.

## Claims

### Claim 1

A launch control method for a vehicle with a dry-type clutch, comprising:
determining, by a controller, a target engine speed corresponding to an operation amount of an accelerator pedal of the vehicle when vehicle launch is started by operation of the accelerator pedal;
calculating, by the controller, a feedforward component which is part of the torque to control the clutch using a rate of change over time of the target engine speed and a current engine torque;
calculating, by the controller, a feedback component which is part of the torque to control the clutch based on a difference between the target engine speed and the current engine speed;
calculating, by the controller, a compensation torque using a current engine torque and an estimated clutch torque which is estimated to be currently transferred by the clutch; and
controlling, by the controller, a clutch actuator to drive the clutch with a sum of the feedforward component, the feedback component, and the compensation torque.

### Claim 2 (depends on 1)

The launch control method of claim 1, further comprising calculating the feedforward component by subtracting a product of the rate of change over time of the target engine speed and a rotational moment of inertia of the engine from the current engine torque.

### Claim 3 (depends on 1)

The launch control method of claim 1, further comprising calculating a Proportional Integral Differential (PID) control value corresponding to a difference obtained by subtracting the target engine speed from the current engine speed as the feedback component.

### Claim 4 (depends on 1)

The launch control method of claim 1, further comprising calculating a Proportional Integral (PI) control value corresponding to a difference obtained by subtracting the estimated clutch torque from the current engine torque as the compensation torque.

### Claim 5 (depends on 1)

The launch control method of claim 1, further comprising calculating, by a torque observer, the estimated clutch torque according to the current engine speed and the current engine torque.

### Claim 6

A launch control system, comprising:
a vehicle with a dry-type clutch; and
a controller configured to:
determine a target engine speed corresponding to an operation amount of an accelerator pedal of the vehicle when vehicle launch is started by operation of the accelerator pedal,
calculate a feedforward component which is part of the torque to control the clutch using a rate of change over time of the target engine speed and a current engine torque,
calculate a feedback component which is part of the torque to control the clutch based on a difference between the target engine speed and the current engine speed,
calculate a compensation torque using a current engine torque and an estimated clutch torque which is estimated to be currently transferred by the clutch, and
control a clutch actuator to drive the clutch with a sum of the feedforward component, the feedback component, and the compensation torque.

### Claim 7

A non-transitory computer readable medium containing program instructions for performing a launch control method for a vehicle with a dry-type clutch, the computer readable medium comprising:
program instructions that determine a target engine speed corresponding to an operation amount of an accelerator pedal of the vehicle when vehicle launch is started by operation of the accelerator pedal;
program instructions that calculate a feedforward component which is part of the torque to control the clutch using a rate of change over time of the target engine speed and a current engine torque;
program instructions that calculate a feedback component which is part of the torque to control the clutch based on a difference between the target engine speed and the current engine speed;
program instructions that calculate a compensation torque using a current engine torque and an estimated clutch torque which is estimated to be currently transferred by the clutch; and
program instructions that control a clutch actuator to drive the clutch with a sum of the feedforward component, the feedback component, and the compensation torque.