Method of controlling launch of vehicle

• US 10,093,318 B2
• Filed: 11/29/2016
• Issued: 10/09/2018
• Est. Priority Date: 06/28/2016
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Inventors: Kim, Jin Sung, Nam, Ju Hyun
• Primary Examiner(s): Holmes, Justin
• Application Number:
  US15/364,017
• Publication Number:
  US 20170369065A1
• Time in Patent Office: 679 Days
• Field of Search: None
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 2050/0048 Addition or subtraction of signals
• CPC Class Codes: B60W 2510/0275 Clutch torque
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/0657 Engine torque
• CPC Class Codes: B60W 2510/0695 Inertia
• CPC Class Codes: B60W 2510/102 Input speed change rate
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2710/022 Clutch actuator position
• CPC Class Codes: B60W 2710/027 Clutch torque
• CPC Class Codes: B60W 2710/0644 Engine speed
• CPC Class Codes: B60W 30/18027 Drive off, accelerating from standstill
• CPC Class Codes: B60W 50/00 Details of control systems for road vehicle drive control not related to the control of a particular sub-unit , e.g. process diagnostic or vehicle driver interfaces
• CPC Class Codes: F16D 2500/10412 Transmission line of a vehicle
• CPC Class Codes: F16D 2500/3065 Torque of the engine
• CPC Class Codes: F16D 2500/3067 Speed of the engine
• CPC Class Codes: F16D 2500/3144 Accelerator pedal position
• CPC Class Codes: F16D 2500/3165 Using the moment of inertia of a component as input for the control
• CPC Class Codes: F16D 2500/3166 Detection of an elapsed period of time
• CPC Class Codes: F16D 2500/70454 : Engine speed
• CPC Class Codes: F16D 2500/7061 : Feed-back
• CPC Class Codes: F16D 48/08 : Regulating clutch take-up on starting

Abstract

A method of controlling launch of a vehicle, may include setting step in which a controller sets a basic target engine speed; a transient control step in which the controller controls a clutch torque based on the basic target engine speed; a transient state determining step in which the controller determines, whether a transition period of change of the engine speed elapsed; a first correction amount determination step in which the controller determines a correction amount; a correction applying step in which the controller adds the correction amount to the predetermined target engine speed and then determines a final target engine speed; an error determination step in which the controller determines the engine speed control error; and a feedback determination step in which the controller uses the engine speed control error and determines a feedback control amount for feedback-controlling a clutch actuator.

Claims

1. A method of controlling launch of a vehicle, comprising:

a setting step in which a controller sets a predetermined target engine speed of an engine according to an operation amount of an accelerator pedal;

a transient control step in which the controller controls a clutch torque based on the predetermined target engine speed;

a transient state determining step in which the controller determines, during performing of the transient control step, when a transition period of change of the engine speed elapsed;

a first correction amount determination step in which when it is determined as a result of performing the transient state determining step that the transition period of change of the engine speed elapsed, the controller determines a correction amount by using a difference between a measured engine speed input and the predetermined target engine speed;

a correction applying step in which the controller adds the correction amount to the predetermined target engine speed and then determines a final target engine speed;

an error determination step in which the controller determines an engine speed control error by using a difference between the final target engine speed and the measured engine speed; and

a feedback determination step in which the controller uses the engine speed control error and determines a feedback control amount for feedback-controlling a clutch actuator,

wherein the controller performs steps from the correction applying step to the feedback determination step repeatedly until the launch of the vehicle is completed and wherein a second correction amount required for the correction applying step at a time of the repeated performing of the steps is determined by a second correction amount determination step in which a previous correction amount is multiplied by a forgetting factor determined by reflecting a speed change amount of an input shaft of a transmission.

2. The method of claim 1, wherein in the transient state determining step, when an engine torque is greater than a predetermined reference engine torque, the clutch torque is greater than a predetermined reference clutch torque, and the measured engine speed change amount is less than a predetermined reference change amount, the controller determines that the transition period of change of the engine speed elapsed.

3. The method of claim 1, wherein the forgetting factor used in the second correction amount determination step is a value greater than 0 and not more than 1 and wherein the forgetting factor is set to a value close to 1 as the speed change amount of the input shaft of the transmission increases.

4. The method of claim 1, wherein the controller further performs a feed-forward value determination step for determining a feed-forward value for controlling the clutch actuator according to the engine torque and the operation amount of the accelerator pedal;

and controls the clutch actuator by adding the feedback control amount determined in the feedback determination step to the feed-forward value.

5. The method of claim 4, wherein the controller determines the feed-forward value with a difference value obtained by subtracting a product of the change amount of the target engine speed according to the operation amount of the accelerator pedal by a moment of rotational inertia of the engine from the engine torque.

6. A method of controlling launch of a vehicle, comprising:

a setting step in which a controller sets a predetermined target engine speed of an engine according to an operation amount of an accelerator pedal;

a transient control step in which the controller feedback-controls a clutch torque based on the predetermined target engine speed and an engine speed to be measured;

a transient state determining step in which the controller determines, during performing of the transient control step, when a transition period of change of the engine speed elapsed based on whether an engine speed change amount is less than a predetermined reference engine speed;

a first correction amount determination step in which when it is determined as a result of performing the transient state determining step that the transition period of change of the engine speed elapsed, the controller determines a correction amount by using a difference between a measured engine speed input and the basic target engine speed;

a second correction amount determination step in which a previous correction amount is multiplied by a forgetting factor determined by reflecting the vehicle speed change amount;

a correction applying step in which the controller adds the correction amount to the predetermined target engine speed and then determines a final target engine speed;

an error determination step in which the controller determines an engine speed control error by using a difference between the final target engine speed and a measured engine speed; and

a feedback determination step in which the controller uses the engine speed control error and determines a feedback control amount for feedback-controlling a clutch actuator,

wherein the controller performs steps from the correction applying step to the feedback determination step repeatedly until the launch of the vehicle is completed and wherein the correction amount required for the correction applying step uses, at a first time, the correction amount obtained by the first correction amount determination step and then, at a time of the repeated performing of the steps, a second correction amount obtained by the second correction amount determination step.

7. The method of claim 6, wherein the forgetting factor used in the second correction amount determination step is a value greater than 0 and not more than 1 and wherein the forgetting factor is set to a value close to 1 as a speed change amount of the vehicle increases.