Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1979-06-13
1982-01-19
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307290, 307359, 328150, H03K 5153
Patent
active
043119247
ABSTRACT:
In order to generate a signal having a well-defined feature which exactly coincides with the zero-crossing point of an input signal, for example in order to define the top dead center position of the crankshaft of an engine for the purpose of valve and ignition timing, the invention provides a circuit which is prepared by the passage of the first half of an input signal across a predetermined threshold. When the first threshold is exceeded, the circuit opens a switch which connects a source of reference potential, equal to the zero crossing point of the input signal, to the threshold switch, to represent a second threshold. As the input signal crosses that second threshold level, which constitutes the zero crossing point, the threshold switch closes, thereby generating the trailing edge of the output signal which constitutes a signal feature coincident with the zero crossing point and hence with a fixed angular position of the rotating shaft. As the zero crossing point is passed, the first threshold level is reestablished. The occurrence of the trailing feature of the output signal is in a constant phase relationship to the input signal and does not depend on the amplitude, frequency or duration of the input signal.
Breckel Werner
Wurst Bert
Robert & Bosch GmbH
Zazworsky John
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