EP0264944A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Vehicle suspension system having variable suspension properties
Assignee: Mazda Motor Corp
•
Filing: 1987-10-22
•
Granted: —
•
Expires: 2007-10-22
Abstract
Abstract A vehicle suspension system (1) including a hydraulic cylinder (2) and a gas spring (8) having a gas chamber (16) and a hydraulic chamber (18) which is connected with the hydraulic cylinder (2). The hydraulic cylinder is located between the vehicle body and the wheel to support the body on the wheels. A control valve (48) is provided for controlling the supply of hydraulic pressure to the cylinder in accordance with a signal from a control unit (60). The control unit receives a detection signal from a detector which detects the pressure in the cylinder and produces a control signal in accordance with a transfer function H(s) = R x S/(1 + R x S).
Inventors
- 👤 Kenichi Watanabe
- 👤 Shin Takehara
- 👤 Hiroo Shimoe
- 👤 Akihiko Miyoshi
- 👤 Shoich Kamimura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 18:55
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/015; B60G17/018; B60G17/0182; B60G2600/00; B60G2600/18; B60G2600/182; B60G2600/187; B60G2600/1878; Y; Y10; Y10S; Y10S280/00; Y10S280/01
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
141 words
A vehicle suspension system comprising hydraulic cylinder means provided between a vehicle body and a wheel and adapted for being supplied with hydraulic liquid under pressure to support the vehicle body on the wheel, hydraulic liquid supply means for supplying hydraulic liquid under pressure to apply a liquid pressure to said cylinder means, load detecting means for detecting a load on said cylinder means and producing a detection signal, control means responsive to said detection signal and producing a control signal in accordance with a transfer function between the detection signal and the control signal, said transfer function being a function of (RxS)/(1 + RxS), where S is a Laplacian operator and R is a constant, liquid supply adjusting means responsive to said control signal and controlling the hydraulic liquid supplied to said cylinder means in accordance with said control signal.
Claim 2
Dependent Claim
141 words
A vehicle suspension system comprising hydraulic cylinder means provided between a vehicle body and a wheel and adapted for being supplied with hydraulic liquid under pressure to support the vehicle body on the wheel, hydraulic liquid supply means for supplying hydraulic liquid under pressure to apply a liquid pressure to said cylinder means, load detecting means for detecting a load on said cylinder means and producing a detection signal, control means responsive to said detection signal and producing a control signal in accordance with a transfer function between the detection signal and the control signal, said transfer function being a function of (RxS)/(1 + RxS), where S is a Laplacian operator and R is a constant, liquid supply adjusting means responsive to said control signal and controlling the hydraulic liquid supplied to said cylinder means in accordance with said control signal.
Claim 3
Dependent Claim
20 words
A vehicle suspension system in accordance with claim 1 in which said cylinder means is provided with gas spring means.
Claim 4
Dependent Claim
46 words
A vehicle suspension system in accordance with claim 2 in which said gas spring means includes casing means having an interior space divided by diaphragm means into gas chamber means and hydraulic liquid chamber means, said hydraulic liquid chamber means being connected with said cylinder means.
Claim 5
Dependent Claim
29 words
A vehicle suspension system in accordance with claim 3 in which said liquid chamber means in the gas spring means is connected with said cylinder means through orifice means.
Claim 6
Dependent Claim
28 words
A vehicle suspension system in accordance with claim 1 in which said load detecting means is pressure detecting means for detecting pressure of liquid in said cylinder means.
Claim 7
Dependent Claim
30 words
A vehicle suspension system in accordance with claim 1 in which said liquid supply adjusting means is control valve means for controlling liquid flow into and from the cylinder means.
Claim 8
Dependent Claim
51 words
A vehicle suspension system in accordance with claim 1 in which said cylinder means, load detection means and liquid supply adjusting means are provided for each wheel of the vehicle, the detection signals for the respective wheels are processed to obtain signals representing bounce, pitch, roll and warp of the vehicle.
Claim 9
Dependent Claim
30 words
A vehicle suspension system in accordance with claim 1 in which said transfer function is R x S/(1 + R x S)(1 + Rʹx S) where Rʹ is a constant.
Claim 10
Dependent Claim
45 words
A vehicle suspension system in accordance with claim 8 which further includes vehicle operating condition detecting means for detecting a vehicle operating condition to produce a vehicle operating condition signal and means for changing said transfer function in accordance with said vehicle operating condition signal.
Claim 11
Dependent Claim
24 words
A vehicle suspension system in accordance with claim 9 in which said changing means is means for changing the constants in the transfer function.
Claim 12
Dependent Claim
24 words
A vehicle suspension system in accordance with claim 9 in which said changing means is means for changing a gain of the transfer function.
Claim 13
Dependent Claim
24 words
A vehicle suspension system in accordance with claim 9 in which said vehicle operating condition detecting means is means for detecting a vehicle speed.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.