Method of estimating torque of transmission clutch

• US 9,353,806 B2
• Filed: 09/02/2014
• Issued: 05/31/2016
• Est. Priority Date: 12/13/2013
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group), Kia Motors Corporation (Kia Corp.)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group), Kia Motors Corporation (Kia Corp.)
• Inventors: Kim, Jin Sung
• Primary Examiner(s): YOUNG, EDWIN
• Application Number:
  US14/475,203
• Publication Number:
  US 20150167758A1
• Time in Patent Office: 637 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: A61B 6/04 Positioning of patients; Tiltable beds or the like operating tables A61G13/00; operating chairs A61G15/00
• CPC Class Codes: F16D 2500/3067 Speed of the engine
• CPC Class Codes: F16D 2500/3165 Using the moment of inertia of a component as input for the control
• CPC Class Codes: F16D 2500/70247 Engine
• CPC Class Codes: F16D 2500/7048 Output shaft torque
• CPC Class Codes: F16D 2500/7061 Feed-back
• CPC Class Codes: F16D 2500/70668 Signal filtering
• CPC Class Codes: F16D 48/06 Control by electric or electronic means, e.g. of fluid pressure
• CPC Class Codes: G01L 1/2206 Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
• CPC Class Codes: G01L 1/246 using integrated gratings, e.g. Bragg gratings
• CPC Class Codes: G01L 3/00 Measuring torque, work, mechanical power, or mechanical efficiency, in general
• CPC Class Codes: G01L 3/242 by measuring and simultaneously multiplying torque and velocity

Abstract

A method of estimating a torque of a transmission clutch may include adjusting an error, deducing an estimated engine angular speed and deducing an estimated clutch torque. The error may be adjusted by deducing an engine transient torque based on an engine angular speed measured using a sensor, an engine static torque deduced using a data map and a load torque depending on a driving load. The estimated engine angular speed may be deduced based on the engine static torque and the engine transient torque. The estimated clutch torque may be deduced by summing an integration value and an error compensation value. The integration value and the error compensation value may be deduced based on a difference between the estimated engine angular speed and the measured engine angular speed.

Claims

1. A method of estimating a torque of a transmission clutch, comprising:

deducing, by a controller, an engine transient torque based on an engine angular speed measured using a sensor, an engine static torque deduced using a data map and a load torque depending on a driving load;

deducing, by the controller, an estimated engine angular speed based on the engine static torque and the engine transient torque;

deducing, by the controller, an estimated clutch torque resulted from slipping of the transmission clutch by summing an integration value and an error compensation value, wherein the integration value and the error compensation value are deduced based on a difference between the estimated engine angular speed and the measured engine angular speed; and

controlling, by the controller, the transmission clutch by using the estimated clutch torque.

2. The method according to claim 1, further comprising:

feeding-back the estimated clutch torque, wherein the deducing of the estimated engine angular speed is based on the engine static torque, the engine transient torque and the estimated clutch torque.

3. The method according to claim 1, wherein the deducing of the engine transient torque comprises:

deducing an engine output torque through differential of the engine angular speed and based on an engine momentum of inertia, wherein the deducing of the engine transient torque is based on the engine output torque, the engine static torque and the load torque.

4. The method according to claim 3, wherein the engine transient torque is deduced by subtracting the engine static torque from the engine output torque and adding the load torque to a resultant torque.

5. The method according to claim 1, wherein the deducing of the engine transient torque comprises:

deducing a final result of the engine transient torque through low-pass filtering of the deduced engine transient torque.

6. The method according to claim 1, wherein the estimated engine angular speed is deduced by summing the engine static torque and the engine transient torque and based on an engine momentum of inertia.

7. The method according to claim 1, wherein an error compensation value is deduced by multiplying the difference between the estimated engine angular speed and the engine angular speed with a torque observer gain.

8. A method of estimating a torque of a transmission clutch, comprising:

deducing, by a controller, an engine transient torque corresponding to an engine output torque in a transient state;

deducing, by the controller, an estimated engine angular speed based on an engine static torque and the engine transient torque;

deducing, by the controller, an estimated clutch torque resulted from slipping of the transmission clutch by summing an integration value and an error compensation value, wherein the integration value and the error compensation value are deduced based on a difference between the estimated engine angular speed and an engine angular speed measured by a sensor; and

controlling, by the controller, the transmission clutch by using the estimated clutch torque.