Device for triggering an event in phase with an angular position of a rotary component and application thereof

A device for triggering an event in phase with a predetermined angular position of a component (0) driven to execute a rotational movement, comprising:

• angular encoding means delivering a pulsed input signal (Sd) in phase with equal angular steps of the component,
• means for delivering a synchronizing signal (Sy, S'y) in response to the passage of the component through at least one angular reference position, and
• electronic circuits for utilizing said signals ensuring the triggering of the event at the position determined by counting the pulses of the input signal, wherein the electronic circuits comprise:
• an angular counter incremented by the input signal (Sd) and reset to zero by the synchronizing signal (Sy, S'y) to exhibit permanently on its outputs a condition which is the image of the instantaneous angular position of the component in relation to the reference position,
• at least one memory circuit in which there is stored a number representing the predetermined angular position in relation to the reference position, and
• at least one comparator which permanently compares the condition of the outputs of said angular counter with that of the outputs of said memory circuit and which delivers a signal for triggering an event (Sp) in response to the detection of a coincidence between said conditions;
• and
• in which the electronic circuits comprise interpolation circuits ensuring electronic subdivision of said angular steps into N equal angular fractions, wherein said angular counter further comprises:
• a first counting circuit for permanent counting of said subdivisions, which is reset to zero by the pulses of the input signal (Sd) and the outputs of which form the least significant outputs of the angular counter, and
• a second counting circuit which is permanently incremented by the pulses of the input signal (Sd) and reset to zero by the synchronizing signal (Sy, S'y) and the outputs of which form the most significant outputs of the angular counter.