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An acoustic fuel injector-atomizer comprising a horn (74) actuated by piezoelectric crystals (28a, 28b) to form a resonant structure (18) excited by an oscillator signal. The oscillator (16) which generates the excitation signal is self-tuned to the resonant frequency of the structure (18) by means

An acoustic fuel injector-atomizer comprising a horn (74) actuated by piezoelectric crystals (28a, 28b) to form a resonant structure (18) excited by an oscillator signal. The oscillator (16) which generates the excitation signal is self-tuned to the resonant frequency of the structure (18) by means of a first transformer coupling (66, 56) which provides a feedback path between the structure (18) and the oscillator transistor (24) and a second transformer coupling (68, 56) which provides a compensation signal representing static capacitance of the crystals (28a, 28b). The compensation signal is subtracted from the feedback signal of the structure (18) so as to eliminate the static capacitance component as an error source in the self-tuning function.

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An acoustic fuel injector system comprising: a mechanically resonant injector structure responsive to an alternating current excitation signal to meter and atomize fuel supplied thereto; oscillator circuit means for producing an alternating current excitation signal; a reactive circuit element corre

An acoustic fuel injector system comprising: a mechanically resonant injector structure responsive to an alternating current excitation signal to meter and atomize fuel supplied thereto; oscillator circuit means for producing an alternating current excitation signal; a reactive circuit element corresponding in value to a substantially static electrical property of the injector structure; means for applying the excitation signal to the injector structure and to the reactive circuit element; first feedback means electrically connecting the structure to the oscillator for tuning the frequency of the excitation signal to the resonant response frequency of the structure; and second feedback means electrically connecting the reactive circuit element to the oscillator for cancelling the effect of the static electrical property of the structure from the excitation signal frequency.