Hydraulic interrupter safety system and method
First Claim
1. A steering interrupt system for a vehicle, which vehicle includes steerable wheels, a hydraulic steering system with a pressurized fluid source, a steering directional control valve connected to the pressurized fluid source, a steering wheel connected to the steering directional control valve, a steering actuator selectively connected to the pressurized fluid source via the steering directional control valve, and an automatic steering system automatically controlling the steering actuator in an automatic steering mode, the steering interrupt system comprising:
- a load sensor connected to the steering directional control valve; and
an interrupt valve connected to the steering directional control valve and the load sensor, the interrupt valve configured to switch from a first state in the automatic steering mode to a second state in an interrupt mode and block pressurized fluid flow from the automatic steering system to the steering actuator based on a fluid pressure load sensed by the load sensor from turning of the steering wheel by an operator, wherein during the interrupt mode;
the steering directional control valve provides pressurized hydraulic fluid to the steering actuator and to control the steerable wheels in proportion to movement of the steering wheel by the operator; and
the interrupt valve is configured to switch from the second state during the interrupt mode back to the first state in the automatic steering mode and unblock the pressurized fluid flow to the steering actuator based on the fluid pressure load sensed by the load sensor indicating the steering wheel is released by the operator.
1 Assignment
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Accused Products
Abstract
A system and method for interrupting a Global Navigation Satellite System (GNSS)-based automatic steering mode of a hydraulic steering system on a vehicle. When a steering wheel is manually turned by an operator, pressurized hydraulic fluid from a steering directional control valve activates an interrupter having an interrupter valve. The interrupter valve blocks pressurized fluid flow to the automatic steering system, thus overriding automatic steering and giving the operator full manual steering control via the steering wheel. The hydraulic interrupt system is mechanical with no electronic elements.
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Citations
32 Claims
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1. A steering interrupt system for a vehicle, which vehicle includes steerable wheels, a hydraulic steering system with a pressurized fluid source, a steering directional control valve connected to the pressurized fluid source, a steering wheel connected to the steering directional control valve, a steering actuator selectively connected to the pressurized fluid source via the steering directional control valve, and an automatic steering system automatically controlling the steering actuator in an automatic steering mode, the steering interrupt system comprising:
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a load sensor connected to the steering directional control valve; and an interrupt valve connected to the steering directional control valve and the load sensor, the interrupt valve configured to switch from a first state in the automatic steering mode to a second state in an interrupt mode and block pressurized fluid flow from the automatic steering system to the steering actuator based on a fluid pressure load sensed by the load sensor from turning of the steering wheel by an operator, wherein during the interrupt mode; the steering directional control valve provides pressurized hydraulic fluid to the steering actuator and to control the steerable wheels in proportion to movement of the steering wheel by the operator; and the interrupt valve is configured to switch from the second state during the interrupt mode back to the first state in the automatic steering mode and unblock the pressurized fluid flow to the steering actuator based on the fluid pressure load sensed by the load sensor indicating the steering wheel is released by the operator. - View Dependent Claims (2, 3, 4, 5, 9)
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6. A steering interrupt system for a vehicle, which vehicle includes steerable wheels, a hydraulic steering system with a pressurized fluid source, a steering directional control valve connected to the pressurized fluid source, a steering wheel connected to the steering directional control valve, a steering actuator selectively connected to the pressurized fluid source via the steering directional control valve, and an automatic steering system to automatically control the steering actuator in an automatic steering mode, the steering interrupt system comprising:
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an interrupt valve connected to the steering directional control valve configured to switch from the automatic steering mode to an interrupt mode where the interrupt valve interrupts pressurized fluid flow to the steering actuator and the steering directional control valve provides pressurized hydraulic fluid to the steering actuator, wherein; the interrupt valve is spring-loaded; the spring of the interrupt valve is configured to expand in the automatic steering mode maintaining an open position allowing the pressurized fluid flow therethrough; and the spring of the interrupt valve is configured to compress in the interrupt mode, closing the interrupt valve and blocking the pressurized fluid flow.
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7. A steering interrupt system, comprising:
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a steering priority valve selectively connecting a pump for a pressurized fluid source to a steering directional control valve; a solenoid-actuated valve connected to the pressurized fluid source and activated by an automatic steering system; a pressure-compensating valve connected to the pressurized fluid source; a proportional flow control directional valve connected to the pressurized fluid source and operated by the automatic steering system; a pair of load-holding valves connected between the proportional flow control directional valve and a steering actuator; a shuttle valve connected between the load-holding valves and the proportional flow control directional valve; and an interrupt valve connected to the steering directional control valve and the steering priority valve configured to block pressurized fluid flow to the steering actuator based on the steering directional control valve indicating manual turning of a steering wheel.
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8. A steering interrupt system for a vehicle, comprising:
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an interrupt valve connected to a steering directional control valve and configured to interrupt pressurized fluid flow in a hydraulic steering system to a steering actuator when a steering wheel is turned by an operator; and a load sensor connected to the steering directional control valve, a load sense shuttle valve, and the interrupt valve, wherein; the load sensor is configured to sense a fluid pressure load resulting from the operator turning the steering wheel; and the interrupt valve is configured to interrupt the pressurized fluid flow in response to the fluid pressure load sensed by the load sensor.
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10. A hydraulic steering system for a vehicle, comprising:
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a steering directional control valve coupled between a steering wheel and a steering actuator; a load sensor connected to the steering directional control valve; and an interrupt valve connected to the steering directional control valve and the load sensor and configured to block pressurized fluid flow to a steering actuator based on a fluid pressure load sensed by the load sensor from manual turning of the steering wheel, wherein; the steering directional control valve is configured to control the steering actuator while the interrupt valve blocks the pressurized fluid flow to the steering actuator; and the interrupt valve is configured to unblock the pressurized fluid flow from to the actuator based on the fluid pressure load sensed by the load sensor indicating the steering wheel is released by said operator. - View Dependent Claims (11, 12, 13, 14, 17)
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15. A hydraulic steering system for a vehicle, comprising:
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a steering directional control valve coupled between a steering wheel and a steering actuator; and an interrupt valve connected to the steering directional control valve and configured to block pressurized fluid flow to the steering actuator in response to manual turning of the steering wheel, wherein; the steering directional control valve is configured to control the steering actuator while the interrupt valve blocks the pressurized fluid flow to the steering actuator; the interrupt valve is configured to unblock the pressurized fluid flow to the steering actuator when the steering wheel is released by the operator; the interrupt valve is spring-loaded; the spring of the spring-loaded interrupt valve is configured to expand maintaining an open position allowing the pressurized fluid flow therethrough; and the spring of the spring-loaded interrupt valve is configured to compress closing the spring-loaded interrupt valve and block the pressurized fluid flow.
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16. A hydraulic steering system for a vehicle, comprising:
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a steering directional control valve coupled between a steering wheel and a steering actuator; an interrupt valve connected to the steering directional control valve and configured to block pressurized fluid flow in a hydraulic steering system to the steering actuator in response to a sensed manual turning of the steering wheel by the steering directional control valve; and a steering priority valve coupling a pump to the steering directional control valve to control the steering actuator while the interrupt valve blocks the pressurized fluid flow. - View Dependent Claims (18)
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19. A hydraulic steering system for a vehicle including steerable wheels, comprising:
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a steering directional control valve selectively connecting a pressurized fluid source to a steering actuator; an interrupt valve connected to the steering directional control valve and configured to block pressurized fluid flow to the steering actuator; and a steering priority valve selectively connecting a pump to the steering directional control valve based on a load sense line connected between the steering directional control valve and the interrupt valve indicating manual operation of a steering wheel, wherein; the steering wheel is configured to control steerable wheels via the steering directional control valve and the steering actuator during the manual operation of the steering wheel, and the hydraulic steering system is configured to switch to an automatic steering mode where an auto-steering system controls the steering actuator and the steerable wheels when the load sense line indicates termination of the manual operation of the steering wheel. - View Dependent Claims (20, 21)
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22. A method of interrupting automatic steering of a vehicle, comprising:
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operating a hydraulic steering system in an automatic steering mode where an automatic steering system automatically controls a steering actuator and steers wheels connected to the steering actuator; sensing an operator turning a steering wheel; sensing with a load sensor a fluid pressure load from a steering directional control valve; activating an interrupt valve when the sensed fluid pressure load indicates manual operation of the steering wheel; blocking with the activated interrupt valve pressurized fluid flow from the automatic steering system to the steering actuator; directing with the steering directional control valve pressurized fluid to the steering actuator to control the steerable wheels in proportion to manual movement of steering wheel by the operator; deactivating the interrupt valve when the sensed fluid pressure load from the load sensor indicates termination of the manual operation of the steering wheel; allowing with the deactivated interrupt valve fluid flow from the automatic steering system said back to the steering actuator and reactivation of the automatic steering mode; and operating the hydraulic steering system back in the automatic steering mode where the automatic steering system automatically controls the steering actuator and steers the wheels. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification