EP0219866A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
System for vehicle body roll control with overshoot prevention
Assignee: Toyota Motor Corp
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Filing: 1986-10-22
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Granted: —
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Expires: 2006-10-22
Abstract
Abstract In this system for vehicle roll control, a plurality of actuator assemblies are provided, one corresponding to each one of the vehicle wheels and resiliently suspending it from the vehicle body. These actuator assemblies have pressure chambers, and each is adapted to increase or decrease the vehicle height at a location corresponding to its corresponding vehicle wheel as respective results of supplying or discharging of working fluid to or from its pressure chamber; they are controlled by duty ratio control. Working fluid supplying and discharging means are provided corresponding to the actuator assemblies arrd supply working fluid to and discharge working fluid from their working fluid chambers. A means senses the road speed of the vehicle, and a meanssensesthe steering angle of the vehicle. Vehicle height detection means are prov- idedforsensingthe heights of the vehicle wheels. A means for computing and control calculates the deviations of the actual detected wheel heights from standard wheel heights; when a certain condition is satisfied, it controls the working fluid supplying and discharging means according to a first duty ratio according to the deviations of the actual wheel heights, so as to maintain the deviations of the actual wheel heights within determinate ranges; and then it controls the working fluid supplying and discharging means in the reverse sense of supply and drain and according to a second duty ratio in a certain manner.
Inventors
- 👤 Nobutaka Oowa
- 👤 Yasuji Arai
- 👤 Osamu Yasuike
- 👤 Hiroyuki Ikemoto
- 👤 Shunichi Doi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 23:54
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/015; B60G17/016; B60G17/0162; Y; Y10; Y10S; Y10S280/00; Y10S280/01
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
302 words
For a vehicle comprising a body and a plurality of wheels upon which said vehicle runs, a roll control system of vehicle hcight adjustment type, comprising: a plurality of actuator assemblies, one provided corresponding to each one of said vehicle wheels and resiliently suspending said one of said vehicle wheels from the vehicle body, said actuator assemblies comprising pressure chambers and each increasing and decreasing vehicle height at a location corresponding to its corresponding vehicle wheel as respective results of supply of working fluid to and discharge of working fluid from its said pressure chamber; a plurality of working fluid supplying and discharging means, which are provided corresponding to said actuator assemblies, for supplying working fluid to said working fluid chambers and for discharging working fluid from said working fluid chambers, and for being controlled by duty ratio control; a plurality of vehicle height detection means, which are provided corresponding to said vehicle wheels, for sensing parameters representative of the heights of the vehicle body over said vehicle wheels; a vehicle speed detecting means, for sensing the road speed of the vehicle; a steering angle detecting means, for sensing the steering angle of the vehicle; and: a computing and control means for: calculating the deviations of the actual wheel heights as detected by said vehicle height detection means from standard wheel heights; when a certain condition is satisfied, controlling said working fluid supplying and discharging means according to a first duty ratio according to said deviations of said actual wheel heights, so as to maintain said deviations of said actual wheel heights within determinate ranges; and then: at the completion of said height maintenance control, controlling said working fluid supplying and discharging means in the reverse sense of supply and drain and according to a second duty ratio in a certain manner.
Claim 2
Dependent Claim
302 words
For a vehicle comprising a body and a plurality of wheels upon which said vehicle runs, a roll control system of vehicle hcight adjustment type, comprising: a plurality of actuator assemblies, one provided corresponding to each one of said vehicle wheels and resiliently suspending said one of said vehicle wheels from the vehicle body, said actuator assemblies comprising pressure chambers and each increasing and decreasing vehicle height at a location corresponding to its corresponding vehicle wheel as respective results of supply of working fluid to and discharge of working fluid from its said pressure chamber; a plurality of working fluid supplying and discharging means, which are provided corresponding to said actuator assemblies, for supplying working fluid to said working fluid chambers and for discharging working fluid from said working fluid chambers, and for being controlled by duty ratio control; a plurality of vehicle height detection means, which are provided corresponding to said vehicle wheels, for sensing parameters representative of the heights of the vehicle body over said vehicle wheels; a vehicle speed detecting means, for sensing the road speed of the vehicle; a steering angle detecting means, for sensing the steering angle of the vehicle; and: a computing and control means for: calculating the deviations of the actual wheel heights as detected by said vehicle height detection means from standard wheel heights; when a certain condition is satisfied, controlling said working fluid supplying and discharging means according to a first duty ratio according to said deviations of said actual wheel heights, so as to maintain said deviations of said actual wheel heights within determinate ranges; and then: at the completion of said height maintenance control, controlling said working fluid supplying and discharging means in the reverse sense of supply and drain and according to a second duty ratio in a certain manner.
Claim 3
Dependent Claim
49 words
A system for vehicle roll control according to claim 1, wherein said certain condition is that: the vehicle speed as detected by said vehicle speed detecting means and the absolute value of said steering angle as detected by said steering angle detecting means are at least certain determinate values.
Claim 4
Dependent Claim
37 words
A system for vehicle roll control according to claim 1, wherein said certain condition is that: said steering angle as detected by said steering angle detecting means is at least a certain determinate value and is decreasing.
Claim 5
Dependent Claim
34 words
A system for vehicle roll control according to claim 2, wherein said certain manner of controlling said working fluid supplying and discharging means is: at said second duty ratio for a determinate time period.
Claim 6
Dependent Claim
41 words
A system for vehicle roll control according to claim 2, wherein said certain manner of controlling said working fluid supplying and discharging means is: at said second duty ratio according to the rate of change of wheel height at that time.
Claim 7
Dependent Claim
39 words
A system for vehicle roll control according to claim 2, wherein said certain manner of controlling said working fluid supplying and discharging means is: at said second duty ratio according to the deviation in vehicle loading at that time.
Claim 8
Dependent Claim
34 words
A system for vehicle roll control according to claim 3, wherein said certain manner of controlling said working fluid supplying and discharging means is: at said second duty ratio for a determinate time period.
Claim 9
Dependent Claim
41 words
A system for vehicle roll control according to claim 3, wherein said certain manner of controlling said working fluid supplying and discharging means is: at said second duty ratio according to the rate of change of wheel height at that time.
Claim 10
Dependent Claim
39 words
A system for vehicle roll control according to claim 3, wherein said certain manner of controlling said working fluid supplying and discharging means is: at said second duty ratio according to the deviation in vehicle loading at that time.
Claim 11
Dependent Claim
108 words
A system for vehicle roll control according to claim 4, wherein said computing and control means is for not performing control of said working fluid supplying and discharging means at said first duty ratio or at said second duty ratio when the absolute values of said deviations of said actual wheel heights from said standard wheel heights are less than a first determinate value, but for, in such a case, controlling said working fluid supplying and discharging means according to a third duty ratio which is less than said first duty ratio, so as to reduce said deviations of said actual wheel heights from said standard wheel heights.
Claim 12
Dependent Claim
66 words
A system for vehicle roll control according to claim 10, wherein said computing and control means is for not performing control of said working fluid supplying and discharging means at said third duty ratio when the absolute values of said deviations of said actual wheel heights from said standard wheel heights are less than a second determinate value which is less than said first determinate value.
Claim 13
Independent Claim
59 words
A system for vehicle roll control according to any one of claims 4, 10, or 11, wherein said computing and control means is for, when the absolute value of steering angle as detected by said steering angle detecting means is at least a second determinate value and is decreasing, terminating control of said working fluid supplying and discharging means.
Claim 14
Dependent Claim
64 words
A system for vehicle roll control according to claim 7, wherein said computing and control means is for not performing control of said working fluid supplying and discharging means at said first duty ratio or at said second duty ratio when the absolute values of said deviations of said actual wheel heights from said standard wheel heights are less than a first determinate value.
Claim 15
Dependent Claim
49 words
A system for vehicle roll control according to claim 5, wherein said computing and control means is for, when the rates of change of said actual wheel heights have fallen below determinate values, terminating said control of said working fluid supplying and discharging means at said second duty ratio.
Claim 16
Dependent Claim
101 words
A system for vehicle roll control according to claim 5, wherein said computing and control means is for, when the absolute values of said deviations of said actual wheel heights from said standard wheel heights are less than first determinate values, not controlling said working fluid supplying and discharging means at said first duty ratio or at said second duty ratio, but instead for controlling said working fluid supplying and discharging means at a third duty ratio which is less than said first duty ratio, so as to reduce said deviations of said actual wheel heights from said standard wheel heights.
Claim 17
Dependent Claim
64 words
A system for vehicle roll control according to claim 15, wherein said computing and control means is for, when the absolute values of said deviations of said actual wheel heights from said standard wheel heights are less than a second determinate value which is less than said first determinate value, not controlling said working fluid supplying and discharging means at said third duty ratio.
Claim 18
Independent Claim
61 words
A system for vehicle roll control according to any one of claims 5, 14, 15, or 16, wherein said computing and control means is for, when the absolute value of said steering angle as detected by said steering angle detecting means is at least a second determinate value and is decreasing, terminating control of said working fluid supplying and discharging means.
Claim 19
Dependent Claim
51 words
A system for vehicle roll control according to claim 8, wherein said computing and control means is for, when the rate of change of said steering angle as detected by said steering angle detecting means has dropped below a determinate value, terminating control of said working fluid supplying and discharging means.
Claim 20
Dependent Claim
62 words
A system for vehicle roll control according to claim 8 or claim 18, wherein said computing and control means is for, when the deviations of said actual wheel heights from said standard wheel heights are less than first determinate values, not performing control of said working fluid supplying and discharging means at said first duty ratio or at said second duty ratio.
Claim 21
Dependent Claim
106 words
A system for vehicle roll control according to claim 6 or claim 9, wherein said computing and control means is for beginning control of said working fluid supplying and discharging means at said first duty ratio when the absolute values of said deviations of said actual wheel heights from said standard wheel heights are at least certain first determinate values, and for terminating said control of said working fluid supplying and discharging means at said first duty ratio when said deviations of said actual wheel heights from said standard wheel heights have become less than second determinate values which are less than said first determinate values.
Claim 22
Dependent Claim
52 words
A system for vehicle roll control according to claim 20, wherein said computing and control means is for, when the absolute value of the deviation in vehicle loading has become not more than said second determinate value, starting control of said working fluid supplying and discharging means at said second duty ratio.
Claim 23
Dependent Claim
68 words
A system for vehicle roll control according to claim 6, wherein said computing and control means is for, when the absolute value of the deviation in vehicle loading has become not more than the sum of a determinate value and a load deviation determined by the vehicle speed and the vehicle steering angle, terminating control of said working fluid supplying and discharging mcans at said second duty ratio.
Claim 24
Dependent Claim
71 words
A system for vehicle roll control according to claim 20, wherein said computing and control means is for, when the absolute value of the deviation in vehicle loading is less than said first determinate value, controlling said working fluid supplying and discharging means at a third duty ratio which is smaller than said second duty ratio, and for reducing said deviations of said actual wheel heights from said standard wheel heights.
Claim 25
Dependent Claim
63 words
A system for vehicle roll control according to claim 23, wherein said computing and control means is for, when the absolute value of said deviations of said actual wheel heights from said standard wheel heights are less than second determinate values which are smaller than said first determinate values, not controlling said working fluid supplying and discharging means at said third duty ratio.
Claim 26
Dependent Claim
82 words
A system for vehicle roll control according to claim 6, wherein said computing and control means is for, when said the absolute value of said steering angle as detected by said steering angle detecting means is at least a second determinate value and is decreasing, terminating said control of said working fluid supplying and discharging means based upon the deviations of said actual wheel heights from said standard wheel heights and the deviation in vehicle loading as calculated up to that point.
Claim 27
Dependent Claim
50 words
A system for vehicle roll control according to claim 6, further comprising a means for detecting vehicle loading, which is a means for detecting the pressures in said pressure chambers of said working fluid supplying and discharging means as fluctuations corresponding to the support loads on the corresponding vehicle wheels.
Claim 28
Dependent Claim
51 words
A system for vehicle roll control according to claim 9, wherein said computing and control means is for, when the absolute value of the deviation in vehicle loading has become not more than a determinate value, terminating control of said working fluid supplying and discharging means at said second duty ratio.
Claim 29
Dependent Claim
64 words
A system for vehicle roll control according to claim 9, wherein said computing and control means is for, when the absolute values of said deviations of said actual wheel heights from said standard wheel heights become less than certain first determinate values, not performing control of said working fluid supplying and discharging means at said first duty ratio or at said second duty ratio.
Claim 30
Dependent Claim
50 words
A system for vehicle roll control according to claim 9, further comprising a means for detecting vehicle loading, which is a means for detecting the pressures in said pressure chambers of said working fluid supplying and discharging means as fluctuations corresponding to the support loads on the corresponding vehicle wheels.
References Cited (Backward Citations)
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