HYDRAULIC ACTUATING CIRCUIT FOR POWER-ASSISTED STEERING, AND MOTOR VEHICLE EQUIPPED THEREWITH
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Accused Products
Abstract
A power-steering hydraulic actuating circuit for a motor vehicle, including a hydraulic fluid distributing valve including hydraulic fluid supply ports connected to a pump via lines. A mechanism restricts the cross section of hydraulic fluid flow from the pump to the port and is provided on the high-pressure line.
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Citations
20 Claims
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1-10. -10. (canceled)
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11. A hydraulic actuating circuit for power-assisted steering for a motor vehicle, comprising:
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at least one steering-control inlet and at least one hydraulic-fluid outlet, the outlet to apply a hydraulic-fluid pressure to a hydraulic cylinder for power-assisted steering to actuate a vehicle steering train in communication with the cylinder as a function of a steering control signal received at the inlet; a pressurized hydraulic-fluid supply pump; at least one first high-pressure hydraulic-fluid line and at least one second hydraulic-fluid line; a hydraulic-fluid distributing valve including first and second hydraulic-fluid supply ports in communication with the pump via the first and second lines respectively, and at least one supplementary port, which is in communication with the outlet, the valve being provided, between the supplementary port and the first or second port, with a hydraulic-fluid passage cross section that is variable as a function of a control signal present at the inlet; and restricting means for restricting the hydraulic-fluid passage cross section of the pump toward the first port provided on the first high-pressure line, wherein, for a steering train having a dynamic whose first order corresponds to a first anti-symmetric train mode, with a given specific frequency, the restricting means is chosen such that the transfer function of the pressure of the outlet relative to the control signal at the inlet has a zero whose frequency is below the specific frequency of the first anti-symmetric train mode. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification