US3901343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle power steering control system
Assignee: Nissan Motor Co Ltd
•
Filing: 1973-11-09
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Granted: 1975-08-26
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Expires: 1993-11-09
Abstract
Abstract A hydraulic pressure control valve for use in a power-assisted steering system of a motor vehicle, which regulates the level of hydraulic pressure in a power chamber of a power steering unit in dependence on vehicle speed and road gradient on which the motor vehicle travels.
Inventors
- 👤 Naohiko Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:55
CPC Classifications
B; B62; B62D; B62D6/00; B62D6/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
184 words
A power-assisted steering control system for a motor vehicle having a source of pressurized fluid and a fluid reservoir and comprising: a steering gear defining therein a chamber; at least one fluid operated steering assistance actuator operatively disposed in said chamber and separating said chamber into first and second chambers; a valve to selectively connect either one of said first and second chambers with said source of pressurized fluid; a fluid pressure control valve selectively connecting either one of said first and second chambers with said fluid reservoir and having therein a movable flow control member to control the amount of the fluid flow flowing from said either one of said first and second chambers into said fluid reservoir; and an electrical actuator responsive to signals indicative of at least one of the vehicle speed and the gradient of the road surface on which the vehicle is driven and having a mechanical actuating member operatively connected with said movable flow control member, said mechanical actuating member being moved substantially proportionally to the degree of at least one of the vehicle speed and the gradient.
Claim 2
Dependent Claim
184 words
A power-assisted steering control system for a motor vehicle having a source of pressurized fluid and a fluid reservoir and comprising: a steering gear defining therein a chamber; at least one fluid operated steering assistance actuator operatively disposed in said chamber and separating said chamber into first and second chambers; a valve to selectively connect either one of said first and second chambers with said source of pressurized fluid; a fluid pressure control valve selectively connecting either one of said first and second chambers with said fluid reservoir and having therein a movable flow control member to control the amount of the fluid flow flowing from said either one of said first and second chambers into said fluid reservoir; and an electrical actuator responsive to signals indicative of at least one of the vehicle speed and the gradient of the road surface on which the vehicle is driven and having a mechanical actuating member operatively connected with said movable flow control member, said mechanical actuating member being moved substantially proportionally to the degree of at least one of the vehicle speed and the gradient.
Claim 3
Dependent Claim
68 words
A system as claimed in claim 1, in which said electrical actuator further includes a vehicle speed sensor and a road gradient sensor to respectively sense the vehicle speed and road gradient and generate a first and a second electrical signal respectively analogous thereto, and electrical computing means responsive to said first and second electrical sigNals and being operative to control said mechanical actuating member in response thereto.
Claim 4
Dependent Claim
61 words
A system as claimed in claim 2, in which said electrical computing means controls said mechanical actuating member to reduce the pressure of fluid in said chamber to a level below that of fluid in said source when the level of at least one of said first and second electrical signals is below a first and a second predetermined value respectively.
Claim 5
Dependent Claim
41 words
A system as claimed in claim 3, in which said fluid pressure control valve further comprises a check valve to permit flow of fluid through said fluid pressure control valve only in a direction from said chamber to said fluid reservoir.
Claim 6
Dependent Claim
24 words
A system as claimed in claim 4, in which said fluid pressure control valve further includes damping means for said movable flow control member.
References Cited (Backward Citations)
US3011579A
Cited
US3564975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |