System for determining failure of remote sensing device
First Claim
1. A system for determining the failure of a remote tire pressure sensor comprising:
- a plurality of remote tire pressure sensors, each of said sensors disposed in a tire on a vehicle and sending signals relating to the pressure in said tire at generally regular time intervals;
a control unit receiving signals from said sensors; and
a system for determining that a failed one of said sensors has failed based upon said control unit receiving a predetermined number of signals from said sensors without receiving a signal from said failed one of said plurality of sensors.
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Accused Products
Abstract
A system for detecting failure in one of a plurality of remote sensing devices utilizes a plurality of counters, each associated with one of the remote sensing devices. Each counter is initially loaded with an initial value. When a signal is received from a remote sensing device, its associated counter is reset to the initial value while the counters of the other remote sensing devices are stepped down. If a sensing device does not send a signal, its associated counter is stepped down numerous times, but never reset to the initial value. When a counter reaches a pre-determined value, typically zero, the associated sensing device is deemed to have failed.
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Citations
20 Claims
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1. A system for determining the failure of a remote tire pressure sensor comprising:
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a plurality of remote tire pressure sensors, each of said sensors disposed in a tire on a vehicle and sending signals relating to the pressure in said tire at generally regular time intervals; a control unit receiving signals from said sensors; and a system for determining that a failed one of said sensors has failed based upon said control unit receiving a predetermined number of signals from said sensors without receiving a signal from said failed one of said plurality of sensors. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for determining the failure of a sensor comprising:
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a plurality of sensors, each sensor sending signals at generally regular time intervals; a control unit receiving signals from said each sensor; and a system for determining that a failed one of said plurality of sensors has failed based upon said control unit receiving a predetermined number of signals from sensors other than said failed sensor without receiving a signal from said failed sensor. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for determining the failure of a sensor comprising the steps of:
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receiving signals from a plurality of sensors, said sensors sending said signals at generally regular independent time intervals; counting the number of said signals received from said plurality of sensors other than a failed one of said plurality of sensors without receiving a signal from said failed sensor; comparing the counted number to a predetermined number; and generating a warning based upon said comparison of said counted number to said predetermined number. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification