Engine knock detection systems and methods

An engine control system of a vehicle, comprising:

• a condition module that generates an indicator of present operating conditions of an engine based on at least one of an engine temperature, fueling of the engine, an amount of ethanol in the fuel, and a number of deactivated cylinders of the engine;
• a noise module that determines a first amount of noise based on vibration measured during a first plurality of combustion events of a cylinder and that stores the first amount of noise and a first value of the indicator of the present operating conditions in a mapping based on a first engine speed and a first engine load;
• and
• a triggering module that determines the first value of the indicator from the mapping based on a second engine speed and a second engine load and that generates a trigger signal when the first value is different than a second value of the indicator,
• wherein, when the trigger signal is generated, the noise module further:
• determines a second amount of noise based on vibration measured during a second plurality of combustion events of the cylinder occurring after the first plurality of combustion events;
• and
• replaces the first amount of noise and the first value in the mapping with the second amount of noise and the second value.