Transducer operational fault determination system
First Claim
1. A dynamic diagnostic operational transducer fault detection system comprising, a first logic network being connected to a low level pressure offset circuit and to an operational transducer to transducer equivalence check circuit, said low level pressure offset circuit being connected to a second logic network, said operational transducer to transducer equivalence check circuit being connected to said first logic network and to an operational transducer to transducer comparison check circuit, said second logic network being connected to a pair of transducer offset test check circuits, said pair of transducer offset test check circuits being connected to a third logic network, said third logic network being connected to a pair of high level transducer fault detector circuits for distinguishing a transducer failure from a faulty dragging and/or stuck brake condition.
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Abstract
A dynamic diagnostic operational transducer fault detection system including a first logic network which is connected to a low level pressure offset circuit and to an operational transducer to transducer equivalence check circuit. The low level pressure offset circuit is connected to a second logic network. The operational transducer to transducer equivalance check circuit is connected to the first logic network and to an operational transducer to transducer comparison check circuit. The second logic network is connected to a pair of transducer offset test check circuits. The pair of transducer offset test check circuits are connected to a third logic network. The third logic network is connected to a pair of high level transducer fault detector circuits which differentiate between a transducer failure and a dragging and/or stuck brake condition.
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Citations
22 Claims
- 1. A dynamic diagnostic operational transducer fault detection system comprising, a first logic network being connected to a low level pressure offset circuit and to an operational transducer to transducer equivalence check circuit, said low level pressure offset circuit being connected to a second logic network, said operational transducer to transducer equivalence check circuit being connected to said first logic network and to an operational transducer to transducer comparison check circuit, said second logic network being connected to a pair of transducer offset test check circuits, said pair of transducer offset test check circuits being connected to a third logic network, said third logic network being connected to a pair of high level transducer fault detector circuits for distinguishing a transducer failure from a faulty dragging and/or stuck brake condition.
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22. A transducer operational fault determination arrangement for distinguishing between a faulty transducer and a false indication of a dragging and/or stuck brake condition of the braking equipment on a railway vehicle comprising, a multiple-stage AND logic network for receiving a plurality of logical input signals representative of various operating conditions of the railway vehicle, said multiple-stage AND logic network supplying a logical output signal to a low level offset means and supplying a logical output signal to a transducer to transducer equivalence check means, said low level offset circuit supplying a logical input signal to a one pair of AND gate circuits of a plural stage logic network, said transducer to transducer equivalence check means supplying a logical input signal to a transducer to transducer comparison check means, a logical input signal signifying the axle rate of the railway vehicle fed to another pair of AND gate circuits of said plural stage logic network, a logical input signal signifying the cylinder pressure of the railway vehicle fed to said transducer to transducer comparison means and to said another pair of AND gate circuits of said plural stage logic network, said transducer to transducer comparison check means supplying a logic input signal to a pair of OR gates, said one pair of AND gate circuits supplying logical input signals to a pair of transducer offset test check means, said transducer offset test check means supplying logical input signals to said pair of OR gates, and said pair of OR gates supplying logical signals to a pair of high level transducer fault detector means.
Specification