System and method for valve event detection and control

A method, comprising:

• receiving a vibration signal sensed by a knock sensor disposed in a combustion engine;
• correlating the vibration signal with a fingerprint having at least an attack, decay, sustain, release (ADSR) envelope indicative of an operating event of a valve train of the combustion engine and analyzing the vibration signal with a statistical valve train model;
• detecting if the operating event has occurred based on correlating of the vibration signal with the fingerprint and based on analyzing the vibration signal with the statistical valve train model;
• and
• controlling the valve train based on the operating event, wherein the ADSR envelope comprises four principle parameters including an attack parameter, a decay parameter, a sustain parameter, and a release parameter, wherein the location of the ADSR envelope at which the operating event occurs is within a mid-region of a decay vector of the AD SR envelope.

A tangible, non-transitory computer readable medium storing code configured to cause a processor to:

• receive a vibration signal sensed by a knock sensor disposed in a combustion engine;
• correlate the vibration signal with a fingerprint having at least an attack, decay, sustain, release (ADSR) envelope indicative of an operating event of a valve train of the combustion engine and analyze the vibration signal with a statistical valve train model;
• detect if the operating event has occurred based on correlating of the vibration signal with the fingerprint and based on analyzing the vibration signal with the statistical valve train model;
• and
• control the valve train based on the operating event, wherein the ADSR envelope comprises four principle parameters including an attack parameter, a decay parameter, a sustain parameter, and a release parameter, and wherein the location of the ADSR envelope at which the operating event occurs is within a mid-region of a decay vector of the ADSR envelope.