Automatic tire pressure monitoring system
First Claim
1. A system for monitoring a source of tire pressure on a vehicle to provide substantially no signal change within a predetermined range of satisfactory tire operating pressure, a rapidly changing signal when tire pressure falls below said pressure range and a different rapidly changing signal when tire pressure exceeds said pressure range comprising:
- a pressure responsive actuator having a movable member,means for moving said member rapidly toward said source of said tire pressure when said pressure falls below said range and to move rapidly away from said source when said pressure exceeds said range, said last named means having a dead band of substantially no movement when said pressure is within said predetermined range of satisfactory tire operating pressure,biasing means urging said member toward said source of said tire pressure,sensing means for sensing the rapid movement of said member and the direction of said movement, said sensing means having an output, andmeans for displaying the output of said sensing means to the operator of said vehicle.
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Accused Products
Abstract
A pressure sensor connected to tire pressure and using a rolling diaphragm in an actuator having two effective operating diameters to provide a dead band corresponding to satisfactory pressure range adjusts a magnetic signal generating unit also mounted on the rotating wheel and having a ferro-magnetic shield to avoid effects of nearby magnetic materials on the field of a permanent magnet which is permitted to pass through windows in the shield to sweep selectively over two position biased magnetic sensors mounted on the vehicle chassis. The different signals of the two magnetic sensors are processed by electronics to reconstruct the pressure sensor position and display corresponding tire condition to the vehicle operator.
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Citations
29 Claims
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1. A system for monitoring a source of tire pressure on a vehicle to provide substantially no signal change within a predetermined range of satisfactory tire operating pressure, a rapidly changing signal when tire pressure falls below said pressure range and a different rapidly changing signal when tire pressure exceeds said pressure range comprising:
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a pressure responsive actuator having a movable member, means for moving said member rapidly toward said source of said tire pressure when said pressure falls below said range and to move rapidly away from said source when said pressure exceeds said range, said last named means having a dead band of substantially no movement when said pressure is within said predetermined range of satisfactory tire operating pressure, biasing means urging said member toward said source of said tire pressure, sensing means for sensing the rapid movement of said member and the direction of said movement, said sensing means having an output, and means for displaying the output of said sensing means to the operator of said vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for monitoring the condition of tire pressure on a vehicle having a rotating wheel, a nonrotating portion, and a vehicle operator'"'"'s station comprising:
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a pressure sensitive actuator mounted on the wheel of said vehicle, magnetic signal generating means connected to be operated by said pressure sensitive actuator, said signal generating means including a permanent magnet disposed to project a magnetic field, the position of said magnetic field projecting toward the nonrotating portion of said vehicle, said magnetic signal generating means being operated by said pressure sensitive actuator for adjusting the position of said magnetic field, a shield of ferromagnetic material located to shield said permanent magnet from the effects of adjacent ferrous materials and from random magnetic influences from substantially all directions except in the direction of the nonrotating portion of the vehicle, said shield having a window opening to permit passage therethrough of a magnetic field toward said nonrotating portion, a plurality of magnetic sensors mounted on the nonrotating portion of the vehicle for detecting said magnetic field, said sensors each producing an output having a component dependent on the location of said magnetic field, said magnetic sensors being positioned so that said component is different for different sensors, electronic means connected to said magnetic sensors to analyze the signals received by said sensors, and means responsive to said electronic means for displaying said condition of said tire pressure at the vehicle operator'"'"'s station. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A system for transferring signals from a rotating body on a machine having a nonrotating portion comprising:
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permanent magnet means on the rotating body for generating a magnetic field with a position dependent on conditions on said rotating body, and a plurality of magnetic sensors positioned a discrete distance apart on said non-rotating portion of the machine, said sensors each producing an output having a component dependent on the location of the field of said signal, said magnetic sensors being positioned so that said component is different for different sensors, means responsive to the outputs of said sensors to sense changes in said position of said magnetic field. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A system for monitoring the condition of tire pressure on a vehicle having a rotating wheel, a non-rotating portion, and an operator'"'"'s station comprising:
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a pressure sensitive actuator adapted to be mounted on the wheel of said vehicle, magnetic signal generating means connected to be operated by said pressure sensitive actuator, said signal generating means including a permanent magnet disposed to project a magnetic field having a position which projects toward the non-rotating portion of said vehicle, said magnetic signal generating means being operated by said pressure sensitive actuator for adjusting the position of said magnetic field, a shield of ferromagnetic material located to shield said permanent magnet from the effects of adjacent ferrous materials and from random magnetic influences from substantially all directions except in the direction of the non-rotating portion of the vehicle, said shield having a window opening to permit passage therethrough of a magnetic field toward said non-rotating portion, a magnetic sensor mounted on the non-rotating portion of the vehicle for detecting said magnetic field, a shield of ferromagnetic material surrounding said magnetic sensor in substantially all directions except in the direction disposed toward said permanent magnet, electronic means connected to said magnetic sensor to analyze the signals received by said sensor, and means responsive to said electronic means for displaying said condition of said pressure of said tire at the vehicle operator'"'"'s station.
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Specification