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Diagnositc circuitry for powered sensor multiple unique faults diagnostics and resistive fault tolerant interface to microprocessor
Diagnositc circuitry for powered sensor multiple unique faults diagnostics and resistive fault tolerant interface to microprocessor
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机译：用于有源传感器的诊断电路，可进行多种独特的故障诊断以及与微处理器的容错容错接口
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摘要
A sensing system includes circuitry having a diagnostic interface for a powered sensor. Responsive to sensing signals, the circuitry is operable to produce a DC level that is defined by operating or fault conditions. The fault conditions include an open voltage supply, an open sensor power return signal, open communication signal(s), series resistance in a communication signal, fault resistance to ground on the communication signal and fault resistance to a voltage source on the communication signal. The circuitry includes a fault tolerant interface between a wire harness at an output of the powered sensor and a digital input port of a microprocessor for the purpose of un-ambiguous fault detection when distortion of sensor information occurs or when loss of sensor information occurs, and wherein the microprocessor diagnoses a fault as defined by the DC level of the analog signal monitored at the communication signal input to the microprocessor.
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