US4472716A — Phase sensitive guidance sensor for wire-followin…

Claim 1

Independent Claim 242 words

A system for guiding a vehicle along a path defined by a guide wire through which an AC current flows and around which a magnetic field is produced, the system comprising: n coils arranged in an array in a direction so as to sense the vertical component of the magnetic field about said wire, with those coils which are on one side of said wire having the vertical component of said field passing those coils in a first direction and the vertical component of said field passing through the remaining coils, which are on the other side of said wire, in an opposite second direction; control means coupled to said n coils for producing a control signal which is a function of the largest number of coils through which said magnetic field passes in said first direction; wherein said control means include n bistable means which are respectively associated with said n coils, with the bistable means which are associated with coils through which the vertical component of the magnetic field passes in said first direction being adapted to be driven to a first state, and those bistable means which are associated with coils through which the vertical component of the magnetic field passes in the second direction being adapted to be driven to a second state, said control means including output means for producing said control signal which is related to the largest number of bistable means in said first state.

Claim 2

Independent Claim 242 words

A system for guiding a vehicle along a path defined by a guide wire through which an AC current flows and around which a magnetic field is produced, the system comprising: n coils arranged in an array in a direction so as to sense the vertical component of the magnetic field about said wire, with those coils which are on one side of said wire having the vertical component of said field passing those coils in a first direction and the vertical component of said field passing through the remaining coils, which are on the other side of said wire, in an opposite second direction; control means coupled to said n coils for producing a control signal which is a function of the largest number of coils through which said magnetic field passes in said first direction; wherein said control means include n bistable means which are respectively associated with said n coils, with the bistable means which are associated with coils through which the vertical component of the magnetic field passes in said first direction being adapted to be driven to a first state, and those bistable means which are associated with coils through which the vertical component of the magnetic field passes in the second direction being adapted to be driven to a second state, said control means including output means for producing said control signal which is related to the largest number of bistable means in said first state.

Claim 3

Dependent Claim 56 words

A system for guiding a vehicle along a path as recited in claim 1 wherein said control means further include means for inhibiting a bistable means from changing state when the two bistable means adjacent thereto are in the same state, and for driving the bistable means to the state of the two adjacent bistable means.

Claim 4

Dependent Claim 43 words

A system for guiding a vehicle along a path as recited in claim 2 wherein said bistable means are clockable and said system further includes clock means for clocking said bistable means at a selected time during each cycle of the magnetic field.

Claim 5

Dependent Claim 43 words

A system for guiding a vehicle along a path as recited in claim 1 wherein said bistable means are clockable and said system further includes clock means for clocking said bistable means at a selected time during each cycle of the magnetic field.

Claim 6

Dependent Claim 60 words

A system for guiding a vehicle along a path as recited in claim 4 wherein said clock means include at least one coil for sensing the horizontal component of the magnetic field, with said bistable means being clocked at a selected time during each cycle when the magnetic flux passes through said at least one coil in a selected direction.

Claim 7

Dependent Claim 21 words

A system for guiding a vehicle along a path as recited in claim 5 wherein said bistable means are flip flops.

Claim 8

Dependent Claim 200 words

A guidance sensor resulting in an alternating magnetic field, the arrangement comprising: an array of n coils arranged in a direction perpendicular to the vehicle's direction of travel and positioned to sense the vertical component of the magnetic field, whereby during a particular half of each cycle of the magnetic field the vertical component of the magnetic field passes all the coils on one side of the wire in a first direction and passes all coils on the other side of the wire in a second direction; control means coupled to said coils for producing a control signal as a function of the largest number of coils through which said vertical component of the magnetic field passes in said first direction, wherein said control means include n flip flops, each associated with a different one of said n coils, each flip flop being drivable to a first state when its associated coil is one through which the vertical component of the magnetic flux passes in said first direction during the particular half of each cycle, and said control means include means for producing said control signal which is related to the largest number of flip flops in said first state.

Claim 9

Dependent Claim 200 words

A guidance sensor resulting in an alternating magnetic field, the arrangement comprising: an array of n coils arranged in a direction perpendicular to the vehicle's direction of travel and positioned to sense the vertical component of the magnetic field, whereby during a particular half of each cycle of the magnetic field the vertical component of the magnetic field passes all the coils on one side of the wire in a first direction and passes all coils on the other side of the wire in a second direction; control means coupled to said coils for producing a control signal as a function of the largest number of coils through which said vertical component of the magnetic field passes in said first direction, wherein said control means include n flip flops, each associated with a different one of said n coils, each flip flop being drivable to a first state when its associated coil is one through which the vertical component of the magnetic flux passes in said first direction during the particular half of each cycle, and said control means include means for producing said control signal which is related to the largest number of flip flops in said first state.

Claim 10

Dependent Claim 23 words

A guidance sensor as recited in claim 7 further including means for clocking said flip flops during said particular half of each cycle.

Claim 11

Dependent Claim 65 words

A guidance sensor as recited in claim 8 further including circuit means coupling each flip flop to its two adjacent flip flop A guidance sensor as recited in claim 8 further including circuit means coupling each flip flop to its direction of passage of the vertical component of the magnetic flux through its associated coil, only when the adjacent flip flops are in different states.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1987-09-18	1988-03-19	1988-09-18	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1991-09-18	1992-03-19	1992-09-18	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1995-09-18	1996-03-19	1996-09-18	$7700.00	Window Closed / Lapsed

Phase sensitive guidance sensor for wire-following vehicles

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