Method of setting control data in an active vibration isolation control system and a control method thereof

• US 20050184214A1
• Filed: 02/18/2005
• Published: 08/25/2005
• Est. Priority Date: 02/20/2004
• Status: Active Grant

• Current Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.)
• Original Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.), Tokai Rubber Industries Limited
• Inventors: Fushimi, Takehiko, Muramatsu, Atsushi, Ichikawa, Hiroyuki, Mizushima, Daichi
• Granted Patent: US 7,747,353 B2
• Time in Patent Office: Days
• US Class Current: 248/638
• CPC Class Codes: F16F 13/26 characterised by adjusting or regulating devices responsive to exterior conditions F16F13/101 takes precedence
• CPC Class Codes: F16F 15/002 characterised by the control method or circuitry control of mechanical oscillations per se G05D19/00
• CPC Class Codes: F16F 15/027 comprising control arrangements F16F15/0237 takes precedence
• CPC Class Codes: G05B 13/041 in which a variable is automatically adjusted to optimise the performance
• CPC Class Codes: G05D 19/02 characterised by the use of electric means

Abstract

A method of setting control data by an active vibration isolation control system includes the steps of selecting, when a frequency of a pulse signal actually detected is superior to a predetermined frequency, appropriate control data selected from among predetermined data maps incorporating control data capable of securing, in accordance with various vehicle driving conditions respectively, a control condition in which operation of the vibrator is preferably controlled, calculating a deviation between the appropriate control data commensurate with the actual vehicle driving condition at the time of controlling and actually detected data representing vibration subjected to a vehicle specific position, the actually detected data obtained in terms of a same physics amount as a physics amount of the control data, and modifying the appropriate control data on the basis of the calculated deviation.

Claims

1. A method of setting control data by an active vibration isolation control system for attenuating vehicle vibration by applying, to an active mount attached with a vibrator mounted on a vehicle, a periodical pulse signal emanating from a vehicle vibration-producing source comprising the steps of:

setting the control data by use of an adaptive control algorithm when a frequency of the pulse signal actually detected is higher than a predetermined frequency;

selecting, when the frequency of the pulse signal actually detected is, equal to, or, lower than, the predetermined frequency, appropriate control data commensurate with an actual vehicle driving condition at a time of controlling, from among predetermined data maps incorporating control data capable of securing, in accordance with various vehicle driving conditions respectively, a control condition in which operation of the vibrator is preferably controlled;

calculating a deviation between the appropriate control data commensurate with the actual vehicle driving condition at the time of controlling and actually detected data representing vibration subjected to a vehicle specific position, the actually detected data obtained in terms of a same physics amount as a physics amount of the control data; and

modifying the appropriate control data on the basis of the calculated deviation, wherein the control data is set on the basis of the appropriate control data modified.

2. A method of setting control data by an active vibration isolation control system for attenuating vehicle vibration according to claim 1, wherein a filter coefficient is set relative to the deviation so as to modify the appropriate control data, wherein the control data is set on the basis of the appropriate control data, the deviation and the filter coefficient.

3. A method of setting control data by an active vibration isolation control system for attenuating vehicle vibration according to claim 2, wherein the filter coefficient is variable.

4. A method of setting control data by an active vibration isolation control system for attenuating vehicle vibration according to claim 3, wherein the filter coefficient is set at a finite value equal to or less than 0.2, and the appropriate control data is modified on the basis of a value generated by multiplying the filter coefficient by the deviation.

5. A method of setting control data by an active vibration isolation control system for attenuating vehicle vibration according to claim 4, wherein the vibrator is operated by use of the control data generated.

6. A method of setting control data by an active vibration isolation control system for attenuating vehicle vibration according to claim 1, wherein the vehicle driving condition is determined on a basis of at least one of:

an engine rotational frequency;

any shift position of a transmission; and

any on-and-off state of an air-conditioning switch, or on a basis of a combination of the engine rotational frequency, any of the shift positions of the transmission and any of the on-and-off states of the air-conditioning switch.

7. A method of setting control data by an active vibration isolation control system for attenuating vehicle vibration according to claim 1, wherein the predetermined frequency is set within a range between 40 Hz and 65 Hz.

8. A method of setting control data by an active vibration isolation control system for attenuating vehicle vibration according to claim 7, wherein the predetermined frequency is set at 50 Hz.

9. A method of setting control data by an active vibration isolation control system for attenuating vehicle vibration according to claim 1, wherein the actually detected data representing vibration subjected to the vehicle specific position is detected by a detecting unit and has an output form consisting of actual amplitude and actual phase in terms of voltage.

10. A method of setting control data by an active vibration isolation control system for attenuating vehicle vibration by applying, to an active mount attached with a vibrator mounted on a vehicle, a periodical pulse signal emanating from a vehicle vibration-producing source comprising the steps of:

setting the control data by use of an adaptive control algorithm when a frequency of the pulse signal actually detected is higher than a predetermined frequency;

selecting, when the frequency of the pulse signal actually detected is, equal to, or, lower than, the predetermined frequency, appropriate control data commensurate with an actual vehicle driving condition at a time of controlling, from among predetermined data maps incorporating control data capable of securing, in accordance with various vehicle driving conditions respectively, a control condition in which operation of the vibrator is preferably controlled;

calculating a deviation, relative to the appropriate control data commensurate with the actual vehicle driving condition at the time of controlling, of actually detected data representing vibration subjected to a vehicle specific position, the actually detected data obtained in terms of a same physics amount as a physics amount of the control data and actually detected data of a control signal applied to the vibrator; and

modifying the appropriate control data on the basis of the calculated deviation, wherein the control data is set on the basis of the appropriate control data modified.

11. A method of setting control data by an active vibration isolation control system for attenuating vehicle vibration according to claim 10, wherein a filter coefficient is set relative to the deviation so as to modify the appropriate control data, wherein the control data is set on the basis of the appropriate control data, the deviation and the filter coefficient.

12. A method of setting control data by an active vibration isolation control system for attenuating vehicle vibration according to claim 11, wherein the filter coefficient is variable.

13. A method of setting control data by an active vibration isolation control system for attenuating vehicle vibration according to claim 12, wherein the filter coefficient is set at a finite value equal to or less than 0.2, and the appropriate control data is modified on the basis of a value generated by multiplying the filter coefficient by the deviation.

14. A method of setting control data by an active vibration isolation control system for attenuating vehicle vibration according to claim 13, wherein the vibrator is operated by use of the control data generated.

15. A method of setting control data by an active vibration isolation control system for attenuating vehicle vibration according to claim 10, wherein the vehicle driving condition is determined on a basis of at least one of:

an engine rotational frequency;

any shift position of a transmission; and

any on-and-off state of an air-conditioning switch, or on a basis of a combination of the engine rotational frequency, any of the shift positions of the transmission and any of the on-and-off states of the air-conditioning switch.

16. A method of setting control data by an active vibration isolation control system for attenuating vehicle vibration according to claim 10, wherein the predetermined frequency is set within a range between 40 Hz and 65 Hz.

17. A method of setting control data by an active vibration isolation control system for attenuating vehicle vibration according to claim 16, wherein the predetermined frequency is set at 50 Hz.

18. A method of setting control data by an active vibration isolation control system for attenuating vehicle vibration according to claim 10, wherein the actually detected data representing vibration subjected to the vehicle specific position is detected by a detecting unit and has an output form consisting of actual amplitude and actual phase in terms of current, and the actually detected data of the control signal applied to the vibrator is detected by a detecting unit.