EP0000818A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Tyre pressure monitoring system
Assignee: Individual
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Filing: 1978-07-26
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Granted: —
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Expires: 1998-07-26
Abstract
Abstract The invention relates to a tyro pressure monitoring system for vehicles having pneumatic or hydraulic tyres. The system includes an enclosed magnet (18) pivotally mounted on the wheel of the vehicle and connected to the tyre so as to pivot, about an axis (19) located mid-way between the poles of the magnet, in response to changes in tyre pressure. A pick-up coil (21) is mounted on the vehicle body in a position wherein the magnet passes the coil during each rotation of the wheel so as to induce an electrical signal in the coil. The electrical signal varies according to the angular position of the magnet relative to the coil during each pass. An electronic circuit in the vehicle cabin is connected to the coil and analyses the signal to determine when the magnet is in a predetermined angular position indicating that the pressure, is above or below a predetermined limit. The electronic circuit initiates a visual and or audible alarm. A system using a micro-processor to provide a display of the actual tyre pressure is also mentioned.
Inventors
- 👤 Oswald Peter Gaertner
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 13:06
CPC Classifications
G; G01; G01L; G01L7/00; G01L7/16; B; B60; B60C; B60C23/00; B60C23/02; B60C23/04; B60C23/0408; B60C23/0422; B60C23/0425
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
160 words
A tyre pressure monitoring system for vehicles having pneumatic or hydraulic tyres comprising a transducer mounted on a wheel of said vehicle and adapted to respond to variations in pressure within a tyre mounted on said wheel, said transducer being adapted to provide signals to indicating means on the body of said vehicle so as to provide an indication at least when said tyre pressure is below a predetermined minimum, characterised in that, said transducer comprises a magnet movably mounted on said wheel and pneumatically or hydraulically connected to said tyre so as to assume different positions relative to a pick-up coil dependent upon said pressure, said pick-up coil being mounted on said body in a position such that said magnet passes said coil during each revolution of said wheel and induces different electrical signals in said coil dependent upon said position, said indicating means being adapted to receive said electrical signals from said pick-up coil and provide said indication.
Claim 2
Dependent Claim
160 words
A tyre pressure monitoring system for vehicles having pneumatic or hydraulic tyres comprising a transducer mounted on a wheel of said vehicle and adapted to respond to variations in pressure within a tyre mounted on said wheel, said transducer being adapted to provide signals to indicating means on the body of said vehicle so as to provide an indication at least when said tyre pressure is below a predetermined minimum, characterised in that, said transducer comprises a magnet movably mounted on said wheel and pneumatically or hydraulically connected to said tyre so as to assume different positions relative to a pick-up coil dependent upon said pressure, said pick-up coil being mounted on said body in a position such that said magnet passes said coil during each revolution of said wheel and induces different electrical signals in said coil dependent upon said position, said indicating means being adapted to receive said electrical signals from said pick-up coil and provide said indication.
Claim 3
Dependent Claim
67 words
A tyre pressure monitoring system as defined in Claim 1, characterised in that, said magnet is pivotally mounted on said wheel about an axis between the poles of said magnet such that pivotal movement causes said different positions which move one pole away from said pick-up coil and the other pole closer to said pick-up coil so as to alter the electrical signal induced in said coil.
Claim 4
Dependent Claim
62 words
A tyre pressure monitoring system as defined in Claim 2, characterised in that, a piston arrangement is accommodated in a pneumatic or hydraulic circuit to said tyre so as to move longitudinally in a bore according to variations in said pressure, said piston being spring biased against said pressure and mechanically connected to said magnet so as to cause said pivotal movement.
Claim 5
Dependent Claim
36 words
A tyre pressure monitoring system as defined in Claim 3, characterised in that, said mechanical connection comprises a toothrack adapted to move with said piston and being in engagement with a cock affixed to said magnet.
Claim 6
Dependent Claim
26 words
A tyre pressure monitoring system as defined in Claim 3, characterised in that said mechanical connection comprises a lever arrangement between said piston and said magnet.
Claim 7
Dependent Claim
56 words
A tyre pressure monitoring system as defined in any one of the preceding claims, characterised in that said pressure is pneumatic pressure and said indicating means includes an electronic circuit adapted to analyse said electrical signals and provide a signal to saidindicating means when said pressure is below said predetermined minimum or above a predetermined maximum.
Claim 8
Dependent Claim
21 words
A tyre pressure monitoring system as defined in Claim 6, characterised in that said indication comprises an audible and visual alarm.
Claim 9
Dependent Claim
40 words
A tyre pressure monitoring system as defined in any one of the preceding claims, characterised in that, said magnet is mounted within a mounting block removably attached to said wheel so as to enable ready detachment of said mounting block.
References Cited (Backward Citations)
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