EP0162448B1
Expired / Lapsed
EP
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Active suspension apparatus
Assignee: Toyota Central R&D Labs Inc
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Filing: 1985-05-21
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Granted: 1989-10-11
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Expires: 2005-05-21
Abstract
No abstract record available.
Inventors
- 👤 Shunichi Doi
- 👤 Noboru Sugiura
- 👤 Yasutaka Hayashi
- 👤 Yuzo Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 10:19
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/015; B60G17/018; B60G2600/00; B60G2600/18; B60G2600/182
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
202 words
An active suspension apparatus using hydropneumatic springs for suspending a body (22) of a vehicle on wheels by utilizing fluid and gas pressures, comprising: hydropneumatic suspension means (V), including hydropneumatic springs (9), actuators (8), and restrictors (6, 7) respectively arranged between hydropneumatic spring chambers and said actuators; acceleration detecting means (I) for detecting an absolute acceleration of said body (22) of said vehicle; a controller (II) for comparing an output signal generated from said acceleration detecting means (I) with a reference value and generating a travel state signal; and driving means (IV) for controlling an opening of each restrictor (6, 7) arranged between each of said hydropneumatic spring chambers and a corresponding one of said actuators (8) in accordance with a signal from said controller (II), characterized in that said acceleration detecting means (I), located at a passenger's compartment where passengers are located, detects an absolute acceleration of a passenger's compartment; and said controller (II) compares absolute acceleration of a passenger's compartment with a reference value and generating a travel state signal based on said absolute acceleration of a passenger's compartment; whereby damping force characteristics are controlled in accordance with a vibration state of the passenger's compartment during travel of the vehicle.
Claim 2
Dependent Claim
202 words
An active suspension apparatus using hydropneumatic springs for suspending a body (22) of a vehicle on wheels by utilizing fluid and gas pressures, comprising: hydropneumatic suspension means (V), including hydropneumatic springs (9), actuators (8), and restrictors (6, 7) respectively arranged between hydropneumatic spring chambers and said actuators; acceleration detecting means (I) for detecting an absolute acceleration of said body (22) of said vehicle; a controller (II) for comparing an output signal generated from said acceleration detecting means (I) with a reference value and generating a travel state signal; and driving means (IV) for controlling an opening of each restrictor (6, 7) arranged between each of said hydropneumatic spring chambers and a corresponding one of said actuators (8) in accordance with a signal from said controller (II), characterized in that said acceleration detecting means (I), located at a passenger's compartment where passengers are located, detects an absolute acceleration of a passenger's compartment; and said controller (II) compares absolute acceleration of a passenger's compartment with a reference value and generating a travel state signal based on said absolute acceleration of a passenger's compartment; whereby damping force characteristics are controlled in accordance with a vibration state of the passenger's compartment during travel of the vehicle.
Claim 3
Dependent Claim
138 words
An apparatus according to claim 1, characterized in that a plurality of paths each having said restrictor (6, 7) arranged between said each hydropneumatic spring chamber (9) and said corresponding actuator (8) are formed parallel to each other, at least one of said paths being provided with a restrictor switching electromagnetic valve (10) for opening/closing said path, said restrictor switching electromagnetic valve (10) being controlled by said driving means (III) such that said restrictor switching electromagnetic valve (10) is opened to decrease a damping force when the absolute value of the acceleration signal is detected by said comparator (4) to be larger than the reference value (E1), and such that said restrictor switching electromagnetic valve (10) is closed to increase a damping force when the absolute value of the comparator (4) to be smaller than the reference value.
Claim 4
Dependent Claim
59 words
An apparatus according to claim 1, characterized by further comprising: displacement detecting means (15) for detecting a relative displacement between the body (22) and a wheel; and height control means (14) for controlling a fluid pressure of said hydropneumatic spring (12, 16, 17) to obtain a predetermined height in accordance with an output from said displacement detecting means (15).
Claim 5
Dependent Claim
40 words
An apparatus according to claim 3, characterized by further comprising pressure detecting means (13) which is constituted by a pressure sensor for detecting, as a fluid pressure of said hydropneumatic spring (12, 16, 17), a pressure in said actuator (8).
Claim 6
Dependent Claim
48 words
An apparatus according to claim 4, characterized in that said displacement detecting means (15) having said pressure sensor is arranged in units of wheels, and said controller (II) and said driving means (III) for controlling the opening of said restrictor (6, 7) are arranged in units of wheels.
Claim 7
Dependent Claim
69 words
An apparatus according to claim 1, characterized in that said controller (II) comprises a band-pass filter (23) for extracting a frequency component (P) of about 0.1 to 4 Hz from the acceleration signal generated from said acceleration detecting means (I), said frequency component including a soft spring component, and a comparator (27) for comparing an extracted component signal with a reference value (E2) and generating the travel state signal.
Claim 8
Dependent Claim
160 words
An apparatus according to claim 1, characterized in that said controller (II) comprises: a first band-pass filter (28a) for extracting a frequency component of about 0.1 to 4 Hz from the acceleration signal generated from said acceleration detecting means (I), the frequency component of 0.1 to 4 Hz including a soft spring component (P) felt by passengers; a second band-pass filter (28b) for extracting a frequency component of about 4 to 8 Hz from the acceleration signal generated from said acceleration detecting means (I), the frequency component of 4 to 8 Hz including a hard and stiff spring component (Q) felt by passengers; an operation circuit (32) for multiplying the frequency components of about 0.1 to 4 Hz and 4 to 8 Hz with corresponding coefficients and for calculating a difference between resultant products; and a comparator (33) for comparing an output signal generated from said operation circuit (32) with the reference value (E3) to generate the travel state signal.
References Cited (Backward Citations)
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