Piezoelectric detonation sensor

Abstract

The invention discloses a piezoelectric detonation sensor. The piezoelectric detonation sensor includes a fixed bolt, wherein the fixed bolt penetrates through the inside of a plastic housing; one end of the plastic housing is provided with a wiring socket; an electrode is arranged between the fixed bolt and the wiring socket; a sleeve pedestal is arranged around the fixed bolt; a piezoelectric original piece is arranged between the sleeve pedestal and the plastic housing; an insulating washer is arranged between the piezoelectric original piece and the sleeve pedestal; and inertia counterweight is arranged at one side of the piezoelectric original piece, and closely attaches to the plastic housing. The piezoelectric detonation sensor is simple in structure and low in manufacturing cost, and can detect detonation through three methods, such as detection of the cylinder pressure and vibration of an engine body; and when detonation occurs in the engine, the sensor generates a corresponding electric signal and transmits the electric signal to an electronic controller so as to enable the electronic controller to eliminate detonation of the engine through the method for retarding ignition.

Description

technical field [0001] The invention relates to the technical field of electronic equipment, in particular to a piezoelectric deflagration sensor. Background technique [0002] Since the microcomputer-controlled ignition system is shared with the engine fuel injection system except for the knock sensor, the knock sensor is an indispensable sensor for the closed-loop control of the ignition advance angle and the anti-knock control system. Whether deflagration occurs, so as to correct the ignition advance angle. At present, most cars use combustion pressure detection type deflagration sensors. Direct detection of combustion pressure to detect engine deflagration is the measurement method with the highest measurement accuracy, but the sensor installation is difficult and durable. poor. Contents of the invention [0003] The object of the present invention is to provide a piezoelectric knock sensor to solve the problems raised in the background art above. [0004] In order t...

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Problems solved by technology

[0002] Since the microcomputer-controlled ignition system is shared with the engine fuel injection system except for the knock sensor, the knock sensor is an indispensable sensor for the closed-loop control of the ignition advance angle and the anti-knock control system. Whether deflagration occurs, so as to correct the ignition advance angle. At present, most cars use combustion pressure detection type deflagration sensors. Direct detection of combustion pressure to detect engine deflagration is the measurement method with the highest measurement accuracy, but the sensor installation is difficult and durable. poor

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