Method for filtering rotational vibrations for motor vehicle

• US 7,497,146 B2
• Filed: 12/14/2007
• Issued: 03/03/2009
• Est. Priority Date: 05/04/2001
• Status: Expired due to Term

• Current Assignee: Valeo Embrayages (Valeo SE)
• Original Assignee: Valeo Embrayages (Valeo SE)
• Inventors: Clausin, Jacques
• Primary Examiner(s): LUONG, VINH
• Application Number:
  US11/956,643
• Publication Number:
  US 20080110293A1
• Time in Patent Office: 445 Days
• Field of Search: 745/741, 743/35, 192/48.8, 192/3.3, 318/114, 318/139, 318/561, 477/5, 180/65.2, 464/64.1, 464/68.4, 267/196, 322/29, 701/68
• US Class Current: 74/574.1
• CPC Class Codes: F16F 15/18 using electric, magnetic or electromagnetic means suppression of vibrations of rotating systems by use of non-rotating magnetic or electromagnetic means F16F15/03; dynamo-electric devices H02K; control effected upon generator excitation circuit to reduce harmful effects of overloads or transients H02P9/10
• CPC Class Codes: Y10T 74/2127 with electrical or magnetic damping

Abstract

A method is provided for filtering out rotational vibrations transmitted by a drive shaft (11, 111) to an output shaft (19, 119, 219). The method comprises the following steps. First, a filtering device is provided that includes a drive shaft damper (20, 120, 220) mounted to the output shaft 19 and an electromagnetic modulating device. The drive shaft damper (20, 120, 220) is selectively tuneable by the electromagnetic modulating device to a frequency of a rotational vibration which is inside the range of frequencies of the rotational vibrations to be damped out. Then, a frequency of a rotational vibration transmitted by the drive shaft (11, 111) is measured. Subsequently, the frequency of the rotational vibration of the drive shaft damper (20, 120, 220) is matched to the frequency of the rotational vibrations transmitted by the drive shaft (11, 111).

Claims

1. A method for filtering out rotational vibrations transmitted by a drive shaft (11, 111) to an output shaft (19,119, 219);

the method comprising the steps of;

providing a filtering device including a drive shaft damper (20, 120, 220) mounted to the output shaft (19) and an electromagnetic modulating device provided for matching a frequency of rotational vibration of the damper (20, 120, 220) to a frequency of rotational vibrations transmitted by the drive shaft (11, 111) which is inside the range of frequencies of the rotational vibrations to be damped out;

measuring a frequency of a rotational vibration transmitted by the drive shaft (11, 111); and

matching the frequency of the rotational vibration of the drive shaft damper (20, 120, 220) to the frequency of the rotational vibrations transmitted by the drive shaft (11,111).

2. The method according to claim 1, wherein the damper (20, 120, 220) comprises a rotor (21, 121, 221) coupled to the output shaft (19, 119, 219) and a stator (126, 226);

the electromagnetic modulating device (23, 123, 223-127, 227) comprises magnets (127, 227) carried by the rotor (21, 121, 221) and coils (23, 123, 223) carried by the stator (126, 226).

3. The method according to claim 2, wherein the magnets (127, 227) define a succession of magnet poles and the coils (23, 123, 223) define a succession of coil poles disposed in line with the magnets (127, 227).

4. The method according to claim 3, wherein the coils (123, 223) are disposed axially in line with the magnets (127, 227).

5. The method according to claim 3, wherein the coils (23) are disposed radially in line with the magnets.

6. The method according to claim 2, wherein the rotor is one of a disc (21, 121, 221), a frusto-conical member and a cylindrical member.

7. The method according to claim 2, wherein the magnets (127, 227) are held in position radially by a counter-centrifugal radial retaining hoop (132).

8. The method according to claim 1, further comprising the step of measuring an amplitude of the vibration transmitted by the drive shaft (11, 111) in a first direction.

9. The method according to claim 8, further comprising the step of matching the amplitude of the rotational vibration of the damper (20, 120, 220) to the amplitude of the rotational vibrations transmitted by the drive shaft (11, 111) in a second direction opposite to the first direction.

10. The method according to claim 1, wherein the filtering device further includes a main vibration damper disposed on the output shaft upstream of the drive shaft damper.

11. A method for filtering out rotational vibrations in a transmission of a motor vehicle comprising a drive shaft (11, 111) driven by an engine of the motor vehicle, an output shaft (19, 119, 219) coupled to the drive shaft releasably through a clutch, and a gearbox (50) drivingly connected to the output shaft (19, 119, 219);

the method for filtering out rotational vibrations transmitted by the drive shaft (11, 111) to the output shaft (19, 119, 219) comprising the steps of;

providing a filtering device including a drive shaft damper (20, 120, 220) mounted to the output shaft 19 and an electromagnetic modulating device provided for matching a frequency of rotational vibration of the damper (20, 120, 220) to a frequency of vibrations transmitted by the drive shaft (11, 111) which is inside the range of frequencies of the rotational vibrations to be damped out;

measuring the frequency of a rotational vibration transmitted by the drive shaft (11, 111); and

matching the frequency of the rotational vibration of the drive shaft damper (20, 120, 220) to the frequency of the rotational vibrations transmitted by the drive shaft (11, 111).

12. The method according to claim 11, wherein control of disengagement of the clutch is carried out electrically, the gearbox (50) is an automated gearbox, gear changes being controlled by a computer (24) which takes into account information delivered by a sensor (53) as to the speed of the input shaft (19) of the gearbox (50), and by a sensor (54) as to the speed of the output shaft (51) of the gearbox (50), firstly after the clutch is disengaged, and secondly after the damper (20) has been tuned to the speed of the input shaft (19) of the gearbox (50), having regard to the new gear ratio to be engaged.

13. The method according to claim 11, wherein the drive shaft damper (20, 120, 220) is used as an electric motor and controlled in such a way as to supply an additional driving torque on the output shaft (19, 119, 219), in addition to a driving torque supplied by the engine (10) of the vehicle.

14. The method according to claim 11, wherein the drive shaft damper (20) is used as an energy recuperator during braking.

15. The method according to claim 14, wherein the clutch (58) is disengaged during an energy recuperation phase.

16. The method according to claim 15, wherein gear ratios are changed down during an energy recuperation phase.