Transmissibility shaping control for active vehicle suspension systems

• US 7,085,636 B2
• Filed: 10/17/2003
• Issued: 08/01/2006
• Est. Priority Date: 10/17/2003
• Status: Expired due to Fees

• Current Assignee: Visteon Global Technologies Incorporated (Visteon Corporation)
• Original Assignee: Visteon Global Technologies Incorporated (Visteon Corporation)
• Inventors: Osorio, Carlos F., Song, Xubin, Edmondson, Jeremy R.
• Primary Examiner(s): Nguyen, Thu V.
• Application Number:
  US10/688,095
• Publication Number:
  US 20050085970A1
• Time in Patent Office: 1,019 Days
• Field of Search: 701 37- 38, 701/48, 280/5.5, 280/5.502, 280/5.506, 280/5.507, 280/5.508, 280/5.512
• US Class Current: 701/38
• CPC Class Codes: B60G 17/0152 characterised by the action on a particular type of suspension unit B60G17/01941 takes precedence
• CPC Class Codes: B60G 17/0155 pneumatic unit
• CPC Class Codes: B60G 17/0165 to an external condition, e.g. rough road surface, side wind
• CPC Class Codes: B60G 17/018 characterised by the use of a specific signal treatment or control method
• CPC Class Codes: B60G 2400/102 vertical
• CPC Class Codes: B60G 2400/252 vertical
• CPC Class Codes: B60G 2500/10 Damping action or damper
• CPC Class Codes: B60G 2500/201 Air spring system type

Abstract

The present invention provides a transmissibility shaping control for active suspension systems. The T-shaping control is a combination of several sub-strategies using the dynamic information in the frequency domain. Each strategy works dominantly in a certain frequency range to achieve a desirable transmissibility for better suspension performance in the corresponding frequency range. Different sub-strategies for different frequency ranges include stiffness control, skyhook control, groundhook control, and various damping levels. In addition, an embodiment is provided utilizing tunable compressible fluid struts in an active vehicle suspension.

Claims

1. A system for controlling an active suspension of a vehicle, having a bounce transmissibility, a roll transmissibility, and a pitch transmissibility, where the bounce, pitch, and roll transmissibilities vary with respect to a frequency of vibration acting upon the vehicle, the system comprising:

a tunable device configured for adjusting stiffness and damping of the active suspension;

a controller in communication with the tunable device, the controller being configured to sense the frequencies of vibration and provide a control signal to the tunable device, wherein the control signal is based on a bounce component, a roll component, and a pitch component dependent on the bounce, pitch, and roll transmissibility at the sensed frequency, wherein the control signal includes a ride control component, a handling control component, and a dive/squat control component;

wherein the controller includes a plurality of control strategies corresponding to a plurality of frequency ranges, and the control signal is based on a control strategy of the plurality of control strategies corresponding to a frequency range of the plurality of frequency ranges that includes the frequency of vibration;

wherein the plurality of control strategies includes a passive suspension control strategy, a small stiffness and skyhook control strategy, a low damping control strategy, a high damping control strategy and stiff suspension strategy; and

wherein the bounce control component Is based on the relationship

2. The system according to claim 1, wherein the control signal is based on the relationship

3. The system according to claim 1, wherein the ride control component includes a bounce control component, a roll control component, and a pitch control component.

4. The system according to claim 3, wherein the ride control is based on the relationship

5. The system according to claim 1, wherein the plurality of frequency ranges includes a low frequency range, a body mode frequency range, a medium frequency range, a wheel hop frequency range, and a high frequency range.

6. A system for controlling an active suspension of a vehicle, having a bounce transmissibility, a roll transmissibility, and a pitch transmissibility, where the bounce, pitch, and roll transmissibilities vary with respect to a frequency vibration acting upon the vehicle, the system comprising:

a tunable device configured for adjusting stiffness and damping of the active suspension;

a controller in communication with the tunable device, the controller being configured to sense the frequencies of vibration and provide a control signal to the tunable device, wherein the control signal is based on a bounce, pitch, and roll component, and a pitch component dependent on the bounce, pitch, and roll transmissibility at the sensed frequency, wherein the control signal includes a ride control component, a handling control component, and a dive/squat control component;

wherein the controller includes a plurality of control strategies corresponding to a plurality of frequency ranges, and the control signal is based on a control strategy of the plurality of control strategies corresponding to a frequency range of the plurality of frequency ranges that includes the frequency of vibration;

wherein the plurality of control strategies includes a passive suspension control strategy, a small stiffness and skyhook control strategy, a low damping control strategy, a high damping control strategy and stiff suspension strategy; and

wherein the pitch control component is based on the relationship

7. A system for controlling an active suspension of a vehicle, having a bounce transmissibility, a roll transmissibility, and a pitch transmissibility, where the bounce, pitch, and roll transmissibilities vary with respect to a frequency of vibration acting upon the vehicle, the system comprising:

a tunable device configured for adjusting stiffness and damping of the active suspension;

a controller in communication with the tunable device, the controller being configured to sense the frequencies of vibration and provide a control signal to the tunable device, wherein the control signal is based on a bounce component, a roll component, and a pitch component dependent on the bounce, pitch, and roll transmissibility at the sensed frequencies, wherein the control signal includes a ride control component, a handling control component, and a dive/squat control component;

wherein the controller Includes a plurality of control strategies corresponding to a plurality of frequency ranges, and the control signal is based on a control strategy of the plurality of control strategies corresponding frequency range of the plurality of frequency ranges that includes the frequency of vibration;

wherein the plurality of control strategies Includes a passive suspension control strategy, a small stiffness and skyhook control strategy, a low damping control strategy, a high damping control strategy and stiff suspension strategy; and

wherein the roll control component is based on the relationship

8. A system for controlling an active suspension of a vehicle, having a bounce transmissibility, a roll transmissibility, and a pitch transmissibility, where the bounce, pitch, and roll transmissibilities vary with respect to a frequency of vibration acting upon the vehicle, the system comprising:

a tunable device configured for adjusting stiffness and damping of the active suspension;

a controller in communication with the tunable device, the controller being configured to sense the frequencies of vibration and provide a control signal to the tunable device, wherein the control signal is based on a bounce component, a roll component, and a pitch component dependent on the bounce, pitch, and roll transmissibility at the sensed frequency wherein the controller includes a plurality of control strategies corresponding to a plurality of frequency ranges, and the control signal is based on a control strategy of the plurality of control strategies corresponding to a frequency range of the plurality of frequency ranges that includes the frequency of vibration;

wherein the plurality of frequency ranges includes a low frequency range, a body mode frequency range, a medium frequency range, a wheel hop frequency range, and a high frequency range; and

wherein the bounce control component is based on the relationship

9. The system according to claim 8, wherein the plurality of control strategies includes a passive suspension control strategy, a small stiffness and skyhook control strategy, a low damping control strategy, a high damping control strategy and stiff suspension strategy.

10. A system for controlling an active suspension of a vehicle, having a bounce transmissibility, a roll transmissibility, and a pitch transmissibility, where the bounce, pitch, and roll transmissibilities vary with respect to a vibration acting upon the vehicle, the system comprising:

a tunable device configured for adjusting stiffness and damping of the active suspension;

a controller in communication with the tunable device, the controller being configured to sense the frequencies of vibration and provide a control signal to the tunable device, wherein the control signal is based on a bounce component, a roll component, and a pitch component dependent on the bounce, pitch, and roll transmissibility at the sensed frequency wherein this controller includes a plurality of control strategies corresponding to a plurality of frequency ranges, and the control signal is based on a control strategy of the plurality of control strategies corresponding to a frequency range of the plurality or frequency ranges that includes the frequency of vibration;

wherein the plurality of frequency ranges Includes a low range, a body mode frequency range, a medium frequency range, a wheel hop frequency range, and a high frequency range; and

wherein the pitch control component is based on the relationship

11. A system for controlling an active suspension of a vehicle, having a bounce transmissibility, a roll transmissibility, and a pitch transmissibility, where the bounce, pitch, and roll transmissibilities vary with respect to a frequency of vibration acting upon the vehicle, the system comprising:

a tunable device configured for adjusting stiffness and damping of the active suspension;

a controller in communication with the tunable device, the controller being configured to sense the frequencies of vibration and provide a control signal to the tunable device, wherein the control signal is based on a bounce component, a roll component, and a pitch component dependent on the bounce, pitch, and roll transmissibility at the sensed frequency wherein the controller includes a plurality of control strategies corresponding to a plurality of frequency ranges, and the control signal is based on a control strategy of the plurality of control strategies corresponding to a frequency range of the plurality of frequency ranges that includes the frequency of vibration;

wherein the plurality of frequency ranges includes a low frequency range, a body mode frequency range, a medium frequency range, a wheel hop frequency range, and a high frequency range; and

wherein the roll control component is based on the relationship