Patent EP0162449A2 successfully refreshed from Google Patents.
EP0162449A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Active suspension apparatus
Assignee: Toyota Central R&D Labs Inc
•
Filing: 1985-05-21
•
Granted: —
•
Expires: 2005-05-21
Abstract
Abstract An active suspension apparatus detects an absolute acceleration Z in a passenger's compartment of a vehicle and a relative displacement X between an axle and a body, calculates an absolute value |Z̈| of the absolute acceleration, an absolute value |X| of the relative displacement and an absolute value |X| of a rate X of change in relative displacement, multiplies the absolute values |X|, |X|, and |Z̈| with coefficients A11, A12 and A13, and adding the resultant product to obtain a sum Y = A11 |X| + A12 |X| + A13 |Z̈|̈, compares the sum Y with a reference value C for evaluating the predetermined movement of the vehicle, and controls the damping forces of the hydropneumatic spnngs. thereby improving steering stability and riding comfort
Inventors
- 👤 Shunichi Doi
- 👤 Noboru Sugiura
- 👤 Yasutaka Hayashi
- 👤 Yuzo Lions Mansion Fujigaoka Garden 314 Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 20:23
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/015; B60G17/018; B60G2300/00; B60G2300/34; B60G2400/00; B60G2400/10; B60G2400/102; B60G2400/20; B60G2400/204; B60G2400/206; B60G2400/25; B60G2400/252; B60G2400/80; B60G2400/82; B60G2401/00; B60G2401/10; B60G2401/12; B60G2500/00; B60G2500/10; B60G2500/40; B60G2600/00; B60G2600/02; B60G2600/12; B60G2600/14; B60G2600/16; B60G2600/18; B60G2600/182; B60G2600/22; B60G2600/26; B60G2800/00; B60G2800/01; B60G2800/012; B60G2800/014
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
246 words
An active suspension apparatus using hydropneumatic springs for suspending a body of a vehicle on wheels by utilizing fluid and air pressures, comprising: acceleration detecting means for detecting an absolute acceleration Z of said body of said vehicle; displacement detecting means for detecting a relative displacement X between an axle and the body; and driving means for controlling an opening of a restrictor arranged between each hydropneumatic spring chamber and a corresponding actuator in accordance with the signal from said comparator, characterized in that said acceleration detecting means, located at a passenger's compartment where passengers are located, detects an absolute acceleration of a passenger's compartment; and a controller has a differentiator for differentiating the relative displacement X detected by said displacement detecting means and generating a rate X of change in relative displacement as a function of time, an absolute value circuit for calculating absolute values of the absolute acceleration Z, the relative displacement X and the rate X of change in relative displacement X, an operation circuit for multiplying the absolute values |Z̈|, |X| and |Ẋ| from said absolute value circuit with predetermined coefficients, respectively, and a comparator for comparing an output signal from said operation circuit with a reference value and generating a signal representing a road surface state representing a road surface on which the vehicle travels and a travel state such as a vehicle velocity; whereby damping force characteristics are controlled in accordance with the road surface state and the travel state.
Claim 2
Dependent Claim
246 words
An active suspension apparatus using hydropneumatic springs for suspending a body of a vehicle on wheels by utilizing fluid and air pressures, comprising: acceleration detecting means for detecting an absolute acceleration Z of said body of said vehicle; displacement detecting means for detecting a relative displacement X between an axle and the body; and driving means for controlling an opening of a restrictor arranged between each hydropneumatic spring chamber and a corresponding actuator in accordance with the signal from said comparator, characterized in that said acceleration detecting means, located at a passenger's compartment where passengers are located, detects an absolute acceleration of a passenger's compartment; and a controller has a differentiator for differentiating the relative displacement X detected by said displacement detecting means and generating a rate X of change in relative displacement as a function of time, an absolute value circuit for calculating absolute values of the absolute acceleration Z, the relative displacement X and the rate X of change in relative displacement X, an operation circuit for multiplying the absolute values |Z̈|, |X| and |Ẋ| from said absolute value circuit with predetermined coefficients, respectively, and a comparator for comparing an output signal from said operation circuit with a reference value and generating a signal representing a road surface state representing a road surface on which the vehicle travels and a travel state such as a vehicle velocity; whereby damping force characteristics are controlled in accordance with the road surface state and the travel state.
Claim 3
Dependent Claim
128 words
An apparatus according to claim 1, characterized in that said controller further comprises: an average value circuit for calculating average values YIXI, Y|X| and Y|Z| of the absolute value |X| of the relative displacement, the absolute value |X| of the rate X of change in relative displacement and the absolute value |Z̈| of the absolute acceleration Z within a predetermined period of time; a comparator for comparing the average values from said average value circuit with corresponding reference values and generating a comparison signal; a discriminator for generating an output signal when all the average values are larger or smaller than the corresponding reference values; and an initial condition setting circuit for setting an initial opening of said restrictor in response to the output signal from said discriminator.
Claim 4
Dependent Claim
48 words
An apparatus according to claim 1, characterized in that said operation circuit in said controller comprises coefficient setting circuits for nonlinearly changing the coefficients in accordance with magnitudes of the outputs from said absolute value circuit, the coefficients being multiplied with the outputs from said absolute value circuit.
Claim 5
Dependent Claim
187 words
An active suspension apparatus using hydropneumatic springs for suspending a body of a vehicle on wheels by utilizing fluid and air pressures, characterized by comprising: acceleration detecting means for detecting an absolute acceleration Z of a passenger's compartment in which a passenger rides; displacement detecting means for detecting a relative displacement X between an axle and the body; a controller having an absolute value circuit for calculating absolute values of the absolute acceleration Z and the relative displacement X, an operation circuit for multiplying the absolute values |Z|, and |X| from said absolute value circuit with predetermined coefficients, respectively, and a comparator for comparing an output signal from said operation circuit with a reference value and generating a signal representing a road surface state representing a road surface on which the vehicle travels and a travel state such as a vehicle velocity; and driving means for controlling an opening of a restrictor arranged between each hydropneumatic spring chamber and a corresponding actuator in accordance with the signal from said comparator, whereby damping force characteristics are controlled in accordance with the road surface state and the travel state.
Claim 6
Dependent Claim
187 words
An active suspension apparatus using hydropneumatic springs for suspending a body of a vehicle on wheels by utilizing fluid and air pressures, characterized by comprising: acceleration detecting means for detecting an absolute acceleration Z of a passenger's compartment in which a passenger rides; displacement detecting means for detecting a relative displacement X between an axle and the body; a controller having an absolute value circuit for calculating absolute values of the absolute acceleration Z and the relative displacement X, an operation circuit for multiplying the absolute values |Z|, and |X| from said absolute value circuit with predetermined coefficients, respectively, and a comparator for comparing an output signal from said operation circuit with a reference value and generating a signal representing a road surface state representing a road surface on which the vehicle travels and a travel state such as a vehicle velocity; and driving means for controlling an opening of a restrictor arranged between each hydropneumatic spring chamber and a corresponding actuator in accordance with the signal from said comparator, whereby damping force characteristics are controlled in accordance with the road surface state and the travel state.
Claim 7
Dependent Claim
220 words
An active suspension apparatus using hydropneumatic springs for suspending a body of a vehicle on wheels by utilizing fluid and air pressures, characterized by comprising: acceleration detecting means for detecting an absolute acceleration Z of a passenger's compartment in which a passenger rides; displacement detecting means for detecting a relative displacement X between an axle and the body; a controller having a differentiator for differentiating the relative displacement X detected by said displacement detecting means and generating a rate X of change in relative displacement as a function of time, an absolute value circuit for calculating absolute values of the absolute acceleration and the rate X of change in relative displacement X, an operation circuit for multiplying the absolute values |Z| and |X| from said absolute value circuit with predetermined coefficients, respectively, and a comparator for comparing an output signal from said operation circuit with a reference value and generating a signal representing a road surface state representing a road surface on which the vehicle travels and a travel state such as a vehicle velocity; and driving means for controlling an opening of a restrictor arranged between each hydropneumatic spring chamber and a corresponding actuator in accordance with the signal from said comparator, whereby damping force characteristics are controlled in accordance with the road surface state and the travel state.
Claim 8
Dependent Claim
220 words
An active suspension apparatus using hydropneumatic springs for suspending a body of a vehicle on wheels by utilizing fluid and air pressures, characterized by comprising: acceleration detecting means for detecting an absolute acceleration Z of a passenger's compartment in which a passenger rides; displacement detecting means for detecting a relative displacement X between an axle and the body; a controller having a differentiator for differentiating the relative displacement X detected by said displacement detecting means and generating a rate X of change in relative displacement as a function of time, an absolute value circuit for calculating absolute values of the absolute acceleration and the rate X of change in relative displacement X, an operation circuit for multiplying the absolute values |Z| and |X| from said absolute value circuit with predetermined coefficients, respectively, and a comparator for comparing an output signal from said operation circuit with a reference value and generating a signal representing a road surface state representing a road surface on which the vehicle travels and a travel state such as a vehicle velocity; and driving means for controlling an opening of a restrictor arranged between each hydropneumatic spring chamber and a corresponding actuator in accordance with the signal from said comparator, whereby damping force characteristics are controlled in accordance with the road surface state and the travel state.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.