Automotive drive train and method for reducing chatter in the same

• US 20090054201A1
• Filed: 06/24/2008
• Published: 02/26/2009
• Est. Priority Date: 12/24/2005
• Status: Active Grant

• Current Assignee: Schaeffler Technologies AG & Co.KG (INA-Holding Schaeffler GmbH & Co. KG)
• Original Assignee: LuK Lamellen und Kupplungsbau Beteiligungs KG (INA-Holding Schaeffler GmbH & Co. KG)
• Inventors: Winkelmann, Stefan, Serebrennikov, Boris
• Granted Patent: US 7,670,256 B2
• Time in Patent Office: Days
• US Class Current: 477/5
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60L 15/20 for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
• CPC Class Codes: B60L 15/2054 by controlling transmissions or clutches
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/441 Speed
• CPC Class Codes: B60L 2240/443 Torque
• CPC Class Codes: B60L 2240/486 Operating parameters
• CPC Class Codes: B60L 2270/145 Structure borne vibrations
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/11 Stepped gearings
• CPC Class Codes: B60W 2050/0052 Filtering, filters
• CPC Class Codes: B60W 30/20 Reducing vibrations in the driveline
• CPC Class Codes: B60Y 2400/428 Double clutch arrangements; Dual clutches
• CPC Class Codes: F16H 2200/0052 the gear ratios comprising six forward speeds
• CPC Class Codes: F16H 3/006 power being selectively transmitted by either one of the parallel flow paths
• CPC Class Codes: F16H 3/093 with two or more countershafts
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 : Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility

Abstract

The invention relates to a method for reducing chatter in automotive drive train which comprises an internal combustion engine as the drive and a clutch device. According to the method, a rotating component of the drive train is driven by means of the internal combustion engine and the speed of the component is detected. Any chatter is also detected. When chatter occurs, an electric motor is used to transmit a torque onto the rotating component in order to actively dampen the chatter. The rotating component is driven by the electric motor for any chatter component at which the speed of the rotating component decreases and the rotating component is slowed down by the electric motor for any chatter component at which the speed of the rotating component increases.

Claims

1-9. -9. (canceled)

10. A method for reducing chatter in a motor vehicle power train that has a combustion engine as a drive and has a clutch device, wherein a rotating component of the power train is driven by the combustion engine and a speed of rotation of the rotating component is detected, and wherein the presence of chatter is detected, the method comprising, when chatter occurs:

actively damping the chatter for a chatter component by transmitting a torque to the rotating component via an electric motor, so that, when the speed of the rotating component is decreasing, the rotating component is driven by the electric motor, and, when the speed of the rotating component is increasing, the rotating component is retarded by the electric motor.

11. The method as recited in claim 10 wherein the rotating component is an input shaft of a shift transmission, and further comprising measuring a rotational speed signal for the first or second input shaft to detect the speed of rotation.

12. The method as recited in claim 11 further comprising providing a control signal for the torque of the electric motor, a signal for the chatter component included in the rotational speed signal being generated through high-pass filtering of the rotation speed signal, forming a differential signal from the control signal and the signal for the chatter component, and setting the torque of the electric depending on the differential signal.

13. The method as recited in claim 12 wherein the torque of the electric motor is set in proportion to an amplitude of the differential signal.

14. The method as recited in claim 12 further comprising determining a mean acceleration of the rotating component, and choosing the control signal so that the acceleration of the electric motor conforms to the mean acceleration of the rotating component.

15. The method as recited in claim 11 wherein the motor vehicle power train has the combustion engine, the electric motor, the clutch device and a parallel shift transmission with a drive part and a first input shaft as well as a second input shaft, and the clutch device has a first clutch to connect a drive part to the first input shaft and a second clutch to connect a drive part to the second input shaft, the method including:

a) disengaging the first and second clutches to a disengaged position in which the first input shaft and the second input shaft are separated from the drive part,

b) for a drive-off procedure, setting the parallel shift transmission so that the first input shaft has a drive connection with an output shaft of the parallel shift transmission by way of a first gear, and the second input shaft is connected by way of a second gear,

c) engaging the first clutch at least far enough so that the first clutch can transmit a torque,

d) detecting whether chatter is present,

e) if chatter is present, transmitting a torque to the second input shaft by the electric motor-in such a way that with the chatter component where the speed of the second input shaft is decreasing, the shaft is driven by the electric motor, and with the chatter component where the speed of the second input shaft is increasing, the shaft is retarded by the electric motor,

f) continuing the procedure with step d).

16. The method as recited in claim 15 wherein after steps c), d) and/or e) checking whether a drive-off process has ended, and steps d), e) and/or f) are carried out only if the drive-off process has not ended.

17. A motor vehicle power train comprising:

a combustion engine as a drive;

a clutch device; and

a device for registering the speed of rotation of a rotating component of the power train, wherein the device for detecting the speed of rotation is connected to a control and/or a regulating device, the motor vehicle power train having an electric motor-as an auxiliary drive connected to the control and/or regulating device through an actuating device, the control and/or regulating device being designed so that with a chatter component where a speed of rotation is decreasing a rotating component is driven by the electric motor, and with the chatter component where the speed of rotation of the rotating component is increasing, the rotating component is retarded by the electric motor.

18. The motor vehicle power train as recited in claim 17 wherein the rotating component is an input shaft of a shift transmission, and the device for detecting the speed of rotation is a rotational speed sensor.

19. The motor vehicle power train as recited in claim 18 wherein the shift transmission is a parallel shift transmission.