METHOD OF CONTROLLING CLUTCH OF VEHICLE

• US 20170114842A1
• Filed: 02/10/2016
• Published: 04/27/2017
• Est. Priority Date: 10/21/2015
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Inventors: CHO, Sung Hyun, HUR, Hwan, NAM, Ju Hyun
• Granted Patent: US 10,006,508 B2
• Time in Patent Office: Days
• CPC Class Codes: F16D 2500/10412 Transmission line of a vehicle
• CPC Class Codes: F16D 2500/30421 Torque of the output shaft
• CPC Class Codes: F16D 2500/3065 Torque of the engine
• CPC Class Codes: F16D 2500/3066 Torque change rate of the engine
• CPC Class Codes: F16D 2500/3144 Accelerator pedal position
• CPC Class Codes: F16D 2500/50206 Creep control
• CPC Class Codes: F16D 2500/5126 Improving response to driver inputs
• CPC Class Codes: F16D 2500/7041 Position
• CPC Class Codes: F16D 2500/7082 of the clutch
• CPC Class Codes: F16D 48/06 Control by electric or electronic means, e.g. of fluid pressure

Abstract

A method of controlling a clutch of a vehicle, by which the clutch can be controlled to reduce jerking impacts in the case of a sudden behavior in engine torque. An amount of APS opening and engine torque are received while the vehicle is cruising using driving force from an engine. When the amount of APS opening is smaller than a first reference value, the clutch is controlled to slip by controlling clutch torque to be smaller than engine torque. After controlling the clutch slip, when the engine acts as a load while the vehicle is cruising, the clutch is engaged by application of the clutch torque to the clutch.

Claims

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

receiving an amount of APS opening and engine torque while the vehicle is cruising using driving force from an engine;

when the amount of APS opening is smaller than a first reference value, controlling a clutch slip by controlling a clutch torque to be smaller than an engine torque; and

after controlling the clutch slip, when the engine acts as a load while the vehicle is cruising, engaging the clutch by applying the clutch torque to the clutch.

2. The method according to claim 1, wherein, in the process of controlling the clutch slip, the clutch torque controlled to be smaller than the engine torque is determined by the following formula:

Tc1=Te+Delta TQ

Delta TQ=Delta TQ(−

1)+F(Nm), where

Tc1 indicates the clutch torque controlled to be smaller than the engine torque,

Te indicates the engine torque,

Delta TQ indicates an amount of a change in torque with respect to the engine torque,

Delta TQ(−

1) indicates an amount of a change in torque with respect to the engine torque calculated by a control cycle right before an F value is reflected, and

F(Nm) indicates an amount of a change in torque with respect to the engine torque during a single control cycle, where F is a negative value.

3. The method according to claim 1, wherein, in the process of controlling the clutch slip, the clutch torque controlled to be smaller than the engine torque is determined by the following formula:

Tc1=MAX{Te+Delta TQ,E(Nm)}

Delta TQ=MIN{Delta TQ(−

1)+F(Nm),G(Nm)}, where

Tc1 indicates the clutch torque controlled to be smaller than the engine torque,

Te indicates the engine torque,

E(Nm) indicates a minimum amount of clutch torque set to be smaller than engine torque, by which driving force from the engine is transferred to a transmission while a slip is caused,

Delta TQ indicates an amount of a change in torque with respect to the engine torque,

Delta TQ(−

1) indicates an amount of a change in torque with respect to the engine torque calculated by a control cycle right before an F value is reflected,

F(Nm) indicates an amount of a change in torque with respect to the engine torque during a single control cycle, where F is a negative value, and

G(Nm) indicates an amount of a change in torque with respect to an engine torque set to leave a minimum amount of clutch torque such that driving force from the engine is transferred to the transmission, where G is a negative value,

wherein the Tc1 controlled to be smaller than the Te is determined to be a greater value among Te+Delta TQ value calculated by the above formula and the E(Nm) value that is set, the Delta TQ is determined to be a smaller value among the Delta TQ(−

1)+F(Nm) value calculated by the above formula and the G(Nm) value that is set.

4. The method according to claim 1, wherein, when the engine torque is smaller than 0 Nm, the clutch is engaged.

5. The method according to claim 1, wherein, in the process of engaging the clutch, the clutch torque controlled to be smaller than the engine torque is determined by the following formula:

Tc2=MIN{Tc2(−

1)+H(Nm),Tc_Base}

Tc_Base=MAX{E(Nm),Te_mirror)}, where

Tc2 indicates a clutch torque applied for engagement of the clutch,

Tc2(−

1) indicates clutch torque calculated in a control cycle before calculation of Tc2,

H(Nm) indicates an amount of a change in clutch torque with respect to a single control cycle that changes along a predetermined gradient when engine torque suddenly decreases,

E(Nm) indicates a minimum amount of clutch torque set to be smaller than engine torque, by which driving force from the engine is transferred to the transmission while a slip is caused, and

Te_mirror indicates an absolute value of engine torque,

wherein the Tc2 applied for engagement of the clutch is determined to be a value which is a smaller value among the Tc2(−

1)+H(Nm) value and the Tc_Base value, and the Tc_Base value is set to a value which is a greater value among the E(Nm) value that is set and the Te_mirror value.

6. The method according to claim 1, wherein, after the process of controlling the clutch slip or after the process of engaging the clutch, when the amount of APS opening is greater than a second reference value or when a period of time, during which the amount of APS opening is equal to or smaller than the second reference value and a difference between a speed of revolution of the engine and a speed of revolution of the clutch exceeds a reference number of revolutions, continues for a reference time or longer, the process of engaging the clutch is canceled.

7. The method according to claim 1, wherein

the amount of APS opening and the engine torque are input via a controller,

the clutch is actuated using a clutch actuator, and

the clutch actuator is controlled by the controller.