EP0249209A2
Expired / Lapsed
EP
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Actively controlled automotive suspension system with improved damping characteristics
Assignee: Nissan Motor Co Ltd
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Filing: 1987-06-10
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Granted: —
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Expires: 2007-06-10
Abstract
Abstract An actively controlled suspension system employs a pressure control valve (18) which is operable in response to a control signal and controls fluid pressure in the fluid chamber of a hydraulic cylinder (15a) as a replacement of the conventional hydraulic shock absorber. The pressure control valve is associated with a controller (30) which detects bounding and rebounding acceleration and stroke speed in bounding and rebounding motion for deriving a control signal to operate the pressure control valve to absorb vibration energy to be transmitted between a vehicle body and a suspension member.
Inventors
- 👤 Naoto Fukushima
- 👤 Hirotsugu Yamaguchi
- 👤 Yohsuke Akatsu
- 👤 Sunao Hano
- 👤 Kanzunobu Kawabata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 17:24
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/015; B60G17/018; B60G2600/00; B60G2600/18; B60G2600/182
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
101 words
An actively controlled suspension system for an automotive vehicle comprising: a suspension assembly including a variable pressure chamber filled with a working fluid; a pressure source connected to said variable pressure chamber for supplying the pressurized working fluid; a pressure adjusting means, interposed between said variable pressure chamber and said pressure source, for adjusting fluid pressure in said variable pressure chamber; sensor means for monitoring vehicular attitude for producing a vehicular attitude indicative signal; and a controller receiving said vehicular attitude indicative signal for deriving a control signal to suppress attitude channge of said vehicle for controlling said pressure adjusting means.
Claim 2
Dependent Claim
101 words
An actively controlled suspension system for an automotive vehicle comprising: a suspension assembly including a variable pressure chamber filled with a working fluid; a pressure source connected to said variable pressure chamber for supplying the pressurized working fluid; a pressure adjusting means, interposed between said variable pressure chamber and said pressure source, for adjusting fluid pressure in said variable pressure chamber; sensor means for monitoring vehicular attitude for producing a vehicular attitude indicative signal; and a controller receiving said vehicular attitude indicative signal for deriving a control signal to suppress attitude channge of said vehicle for controlling said pressure adjusting means.
Claim 3
Dependent Claim
74 words
An actively controlled suspension system as set forth in claim 1 wherein said suspension assembly includes a suspension member rotatably supporting a vehicular wheel, and said variable pressure chamber is disposed between said suspension member and the corresponding section of a vehicle body, and wherein said variable pressure chamber is variable of said fluid pressure therein in response to relatively high frequency vibration input from said suspension member in order to absorb vibration energy.
Claim 4
Dependent Claim
50 words
An actively controlled suspension system as set forth in claim 2, wherein said sensor means is provided on said vehicle body for monitoring an acceleration of bounding and rebounding motion of said vehicle body for producing a bounding and rebounding motion acceleration indicative signal as said vehicular attitude indicative signal.
Claim 5
Dependent Claim
55 words
An actively controlled suspension system set forth in claim 3, wherein said controller derives a bounding and rebounding motion speed based on said bounding and rebounding acceleration indicative signal values and detectes the vehicular attitude change based on said bounding and rebounding accekeration and said bounding and rebounding motion speed for deriving said control signal.
Claim 6
Dependent Claim
31 words
An actively controlled suspension system as set forth in claim 4, wherein said controller derives said bounding and rebounding motion speed by integrating said bounding and rebounding acceleration indicative signal value.
Claim 7
Dependent Claim
57 words
An actively controlled suspension system as set forth in claim 5, which further comprises a reset signal generator means associated with said controller, said reset signal generator means detecting a vehicular driving condition satisfying a predetermined reset condition for outputting a reset signal for resetting said integrated value of said bounding and rebounding acceleration indicative signal value.
Claim 8
Dependent Claim
67 words
An actively controlled suspension system as set forth in claim 4, wherein said controller derives a bounding and rebounding acceleration dependent component of said control signal based on said bounding and rebounding acceleration indicative signal value and a given first gain and a bounding and rebounding motion speed dependent component of said control signal based on said bounding and rebounding motion speed and a given second gain.
Claim 9
Dependent Claim
35 words
An actively controlled suspension system as set forth in claim 7, wherein said control signal is a sum of said bounding and rebounding acceleration dependent component and said bounding and rebounding motion speed dependent component.
Claim 10
Dependent Claim
29 words
An actively controlled suspension system as set forth in claim 8, which further comprises a manually operable means for adjusting at least one of said first and second gains.
Claim 11
Dependent Claim
152 words
An actively controlled suspension system for an automotive vehicle comprising: a suspension assembly provided for suspensing a vehicle body on each vehicular wheel, said suspension assembly including a variable pressure chamber filled with a working fluid; a pressure source connected to said variable pressure chamber for supplying the pressurized working fluid; a pressure adjusting means, interposed between each of said variable pressure chamber and said pressure source, for adjusting fluid pressure in said variable pressure chamber; sensor means for monitoring essentially vertical motion of each suspended section where one of the vehicular wheels is provided, said sensor means producing a vertical motion indicative signals respectively indicative of vertial motions of respective suspended sections; and a controller receiving said vertical motion indicative signal for deriving control signals to suppress vertical motion at respectively corresponding suspended sections of said vehicle for controlling said pressure adjusting means to adjust pressure in respective variable pressure chambers.
Claim 12
Dependent Claim
152 words
An actively controlled suspension system for an automotive vehicle comprising: a suspension assembly provided for suspensing a vehicle body on each vehicular wheel, said suspension assembly including a variable pressure chamber filled with a working fluid; a pressure source connected to said variable pressure chamber for supplying the pressurized working fluid; a pressure adjusting means, interposed between each of said variable pressure chamber and said pressure source, for adjusting fluid pressure in said variable pressure chamber; sensor means for monitoring essentially vertical motion of each suspended section where one of the vehicular wheels is provided, said sensor means producing a vertical motion indicative signals respectively indicative of vertial motions of respective suspended sections; and a controller receiving said vertical motion indicative signal for deriving control signals to suppress vertical motion at respectively corresponding suspended sections of said vehicle for controlling said pressure adjusting means to adjust pressure in respective variable pressure chambers.
Claim 13
Dependent Claim
81 words
An actively controlled suspension system as set forth in claim 10, wherein each of said suspension assembly includes a suspension member rotatably supporting said vehicular wheel, and each of said variable pressure chamber is disposed between said suspension member and the corresponding one of suspended sections of said vehicle body, and wherein said variable pressure chamber is variable of said fluid pressure therein in response to relatively high frequency vibration input from said suspension member in order to absorb vibration energy.
Claim 14
Dependent Claim
50 words
An actively controlled suspension system as set forth in claim 11, wherein said sensor means is provided on said vehicle body for monitoring an acceleration of bounding and rebounding motion of said vehicle body for producing a bounding and rebounding motion acceleration indicative signal as said vehicular attitude indicative signal.
Claim 15
Dependent Claim
69 words
An actively controlled suspension system set forth in claim 12, wherein said controller derives a bounding and rebounding motion speed based on said bounding and rebounding acceleration indicative signal values for detecting bounding and rebounding motion at respective suspended sections of the vehicle body and detectes the vehicular attitude change based on said bounding and rebounding accekeration and said bounding and rebounding motion speed for deriving said control signals.
Claim 16
Dependent Claim
31 words
An actively controlled suspension system as set forth in claim 13, wherein said controller derives said bounding and rebounding motion speed by integrating said bounding and rebounding acceleration indicative signal value.
Claim 17
Dependent Claim
57 words
An actively controlled suspension system as set forth in claim 14, which further comprises a reset signal generator means associated with said controller, said reset signal generator means detecting a vehicular driving condition satisfying a predetermined reset condition for outputting a reset signal for resetting said integrated value of said bounding and rebounding acceleration indicative signal value.
Claim 18
Dependent Claim
67 words
An actively controlled suspension system as set forth in claim 15, wherein said controller derives a bounding and rebounding acceleration dependent component of said control signal based on said bounding and rebounding acceleration indicative signal value and a given first gain and a bounding and rebounding motion speed dependent component of said control signal based on said bounding and rebounding motion speed and a given second gain.
Claim 19
Dependent Claim
35 words
An actively controlled suspension system as set forth in claim 16, wherein said control signal is a sum of said bounding and rebounding acceleration dependent component and said bounding and rebounding motion speed dependent component.
Claim 20
Dependent Claim
29 words
An actively controlled suspension system as set forth in claim 17, which further comprises a manually operable means for adjusting at least one of said first and second gains.
Claim 21
Dependent Claim
27 words
An actively controlled suspension system as set forth in claim 18, wherein said controller derives said control signals for respective pressure adjusting means independently to each other.
Claim 22
Dependent Claim
165 words
An actively controlled suspension system for an automotive vehicle comprising: a suspension assembly provided for suspensing a vehicle body on each vehicular wheel, said suspension assembly including a variable pressure chamber filled with a working fluid; a pressure source connected to said variable pressure chamber for supplying the pressurized working fluid; a pressure adjusting means, interposed between each of said variable pressure chamber and said pressure source, for adjusting fluid pressure in said variable pressure chamber; sensor means for monitoring acceleration in essentially vertical motion in bounding and rebounding directions of each suspended section where one of the vehicular wheels is provided, said sensor means producing a vertical motion indicative signals respectively indicative of vertial motions of respective suspended sections; and a controller receiving said vertical motion indicative signal for detecting vehicular attitude change for deriving control signals to suppress vehicular attitude change at respectively corresponding suspended sections of said vehicle for controlling said pressure adjusting means to adjust pressure in respective variable pressure chambers.
Claim 23
Dependent Claim
165 words
An actively controlled suspension system for an automotive vehicle comprising: a suspension assembly provided for suspensing a vehicle body on each vehicular wheel, said suspension assembly including a variable pressure chamber filled with a working fluid; a pressure source connected to said variable pressure chamber for supplying the pressurized working fluid; a pressure adjusting means, interposed between each of said variable pressure chamber and said pressure source, for adjusting fluid pressure in said variable pressure chamber; sensor means for monitoring acceleration in essentially vertical motion in bounding and rebounding directions of each suspended section where one of the vehicular wheels is provided, said sensor means producing a vertical motion indicative signals respectively indicative of vertial motions of respective suspended sections; and a controller receiving said vertical motion indicative signal for detecting vehicular attitude change for deriving control signals to suppress vehicular attitude change at respectively corresponding suspended sections of said vehicle for controlling said pressure adjusting means to adjust pressure in respective variable pressure chambers.
Claim 24
Dependent Claim
81 words
An actively controlled suspension system as set forth in claim 20, wherein each of said suspension assembly includes a suspension member rotatably supporting said vehicular wheel, and each of said variable pressure chamber is disposed between said suspension member and the corresponding one of suspended sections of said vehicle body, and wherein said variable pressure chamber is variable of said fluid pressure therein in response to relatively high frequency vibration input from said suspension member in order to absorb vibration energy.
Claim 25
Dependent Claim
50 words
An actively controlled suspension system as set forth in claim 21, wherein said sensor means is provided on said vehicle body for monitoring an acceleration of bounding and rebounding motion of said vehicle body for producing a bounding and rebounding motion acceleration indicative signal as said vehicular attitude indicative signal.
Claim 26
Dependent Claim
69 words
An actively controlled suspension system set forth in claim 22, wherein said controller derives a bounding and rebounding motion speed based on said bounding and rebounding acceleration indicative signal values for detecting bonding and rebounding motion at respective suspended sections of the vehicle body and detectes the vehicular attitude change based on said bounding and rebounding accekeration and said bounding and rebounding motion speed for deriving said control signals.
Claim 27
Dependent Claim
31 words
An actively controlled suspension system as set forth in claim 23, wherein said controller derives said bounding and rebounding motion speed by integrating said bounding and rebounding acceleration indicative signal value.
Claim 28
Dependent Claim
57 words
An actively controlled suspension system as set forth in claim 24, which further comprises a reset signal generator means associated with said controller, said reset signal generator means detecting a vehicular driving condition satisfying a predetermined reset condition for outputting a reset signal for resetting said integrated value of said bounding and rebounding acceleration indicative signal value.
Claim 29
Dependent Claim
67 words
An actively controlled suspension system as set forth in claim 25, wherein said controller derives a bounding and rebounding acceleration dependent component of said control signal based on said bounding and rebounding acceleration indicative signal value and a given first gain and a bounding and rebounding motion speed dependent component of said control signal based on said bounding and rebounding motion speed and a given second gain.
Claim 30
Dependent Claim
35 words
An actively controlled suspension system as set forth in claim 26, wherein said control signal is a sum of said bounding and rebounding acceleration dependent component and said bounding and rebounding motion speed dependent component.
Claim 31
Dependent Claim
29 words
An actively controlled suspension system as set forth in claim 27, which further comprises a manually operable means for adjusting at least one of said first and second gains.
Claim 32
Dependent Claim
27 words
An actively controlled suspension system as set forth in claim 28, wherein said controller derives said control signals for respective pressure adjusting means independently to each other.
References Cited (Backward Citations)
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