EP0306004A2
Expired / Lapsed
EP
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Electronic controlled fluid suspension system
Assignee: Toyota Motor Corp
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Filing: 1988-08-31
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Granted: —
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Expires: 2008-08-31
Abstract
Abstract An electronic controlled suspension system detects a load on the fluid actuators and calculates a torsional load on the vehicle. Responsive to the calculated torsional load, corrective control is executed on the fluid flow to and from the fluid actuators, eliminating torsional load on the vehicle. Therefore, the driving characteristic is prevented from changing due to an unbalanced load on the vehicle. On the other hand, the electronic controlled suspension system detects a vehicle's cornering state. Responsive to the cornering state detected, control signals are output to increase the roll stiffness distribution to the front wheels. As a result, the roll stiffness distribution to the front wheels while the vehicle is about to corner becomes larger than that while the vehicle is steadily cornering. Responsive to the control signals, the vehicle attitude is controlled by supplying and discharging fluid to and from fluid actuators. Consequently, when the vehicle is just starting to corner, laterally moving load is controlled, and quick-responsive steering is realized.
Inventors
- 👤 Takashi Yonekawa
- 👤 Shuuichi Buma
- 👤 Toshio Aburaya
- 👤 Osamu Takeda
- 👤 Shunichi K.K. Toyota Chuo Kenkyusho Doi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 17:02
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/015; B60G17/016; B60G17/0162; B60G2400/00; B60G2400/60; B60G2400/61; B60G2400/63; B60G2800/00; B60G2800/01; B60G2800/012; B60G2800/0122; B60G2800/24; B60G2800/90; B60G2800/91; B60G2800/915
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
104 words
1 An electronic controlled fluid suspension system comprising: a fluid suspension corresponding to each wheel and having a fluid actuator; a load detection means for detecting a suspension load applied to the fluid suspension; a torsional load calculation means for calculating a torsional load applied to the vehicle in response to the suspension load; a compensation control means for determining an undesired torsional load in accordance with the suspension load and calculating a control amount in order to remove the undesired torsional load; and a fluid flow control means responsive to the control amount for controlling fluid flow to and from the fluid actuator.
Claim 2
Dependent Claim
104 words
1 An electronic controlled fluid suspension system comprising: a fluid suspension corresponding to each wheel and having a fluid actuator; a load detection means for detecting a suspension load applied to the fluid suspension; a torsional load calculation means for calculating a torsional load applied to the vehicle in response to the suspension load; a compensation control means for determining an undesired torsional load in accordance with the suspension load and calculating a control amount in order to remove the undesired torsional load; and a fluid flow control means responsive to the control amount for controlling fluid flow to and from the fluid actuator.
Claim 3
Dependent Claim
64 words
2 An electronic controlled fluid suspension system according to claim 1 wherein the torsional load calculation means includes a means for calculating the torsional load in response to a first difference between the right front wheel suspension load and the left front wheel suspension load, and to a second difference between the right rear wheel suspension load and the left rear wheel suspension load.
Claim 4
Dependent Claim
159 words
3 An electronic controlled fluid suspension system according to claim 2 wherein the compensation control means includes: a first comparing means for comparing the first difference with a first torsional guard load; a second comparing means for comparing the second difference with a second torsional guard load; a torsional load determination means communicating with the first and second comparing means for determining whether or not the torsional load greater than or equal to a predetermined amount is applied to the front and rear wheels; a torsional direction determination means for determining whether or not a first direction of torsional load applied to a front part of the vehicle is opposite to a second direction of torsional load applied to a rear part of the vehicle in accordance with the first and second differences; and an undesired torsional load determination means communicating with the torsional load determination means and the torsional direction determination means for determining the undesired torsional load.
Claim 5
Dependent Claim
51 words
4 An electronic controlled fluid suspension system according to claim 3 wherein the fluid flow control means includes: means for calculating a total compensation pressure amount for the fluid suspension and calculating a total compensation control pressure obtained by correcting the total compensation pressure amount in response to the torsional load.
Claim 6
Dependent Claim
106 words
5 An electronic controlled fluid suspension system according to claim 1 further comprising: a vehicle cornering state detection means for detecting a vehicle's running condition and for determining whether or not the vehicle is in a transient state or a steady cornering state in response to the vehicle running condition; a roll stiffness distribution determination means for calculating a desired roll stiffness distribution to front wheels and rear wheels in response to the transient state and the steady cornering state; and an increasing means for increasing the desired roll stiffness distribution to front wheels during the transient cornering state rather than during the steady cornering state.
Claim 7
Dependent Claim
56 words
6 An electronic controlled fluid suspension system according to claim 5 wherein the fluid flow control means includes: means for calculating a total compensation pressure amount for the fluid suspension and calculating a total compensation control pressure obtained by correcting the total compensation pressure amount in response to the torsional load and the roll stiffness distribution.
Claim 8
Dependent Claim
63 words
7 An electronic controlled fluid suspension system for a vehicle according to claim 5 wherein the vehicle cornering detection means includes a means for detecting a vehicle speed and a steering angular speed and calculating an estimated lateral acceleration in relation to the vehicle speed and the steering angular speed, and the estimated lateral acceleration is used to determine the vehicle cornering state.
Claim 9
Dependent Claim
41 words
8 An electronic controlled fluid suspension system for a vehicle according to claim 5 wherein the vehicle cornering state detection means includes a means for detecting a vehicle acceleration, and the vehicle's acceleration is used to determine the vehicle cornering state.
References Cited (Backward Citations)
No citation records indexed.
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