Piezoelectric Igniter/Pressure-Sensor Devices

Piezoelectric devices that would serve as spark plugs, power generators for spark plugs, and/or pressure sensors have been proposed for use in internal-combustion engines. Unlike conventional spark plugs, these devices would function without need for wire connections to external high-voltage sources. Also, unlike conventional spark plugs, these devices could function without need for external timing circuitry, and/or could function as parts of timing circuitry.