This patent describes a method of controlling operation of an internal combustion engine close to the knocking level of the engine, utilizing a computer means providing sensed operating parameter values from the engine to the computer a knock sensor providing knock signals, to the computer a programmable memory, the memory storing data representing functional relationships of operating parameters of the engine with respect to the then-pertaining operating conditions thereof, the computer receiving data, from the memory, relating the operating parameters of the engine to then-pertaining operating conditions and providing output control signals to the engine providing in the memory a basic functional relationship of operating parameters of the engine with respect to a set of operating conditions thereof determining, in the computer, based on operating experience, which control settings result in knocking, and thus where, along a range of control settings, a knocking limit lies, recording in the non-volatile section of the memory adapting up-dating data which represents functional relationships associating operating parameter control setting values, under then-pertaining engine operating conditions, with engine operation just short of the knocking limit providing limiting values for modification of the stored functional relationships of the data in the memory testing whether the up-dating more » data have values within the limiting values, locking up in the non-volatile section of the memory based on sensed operating parameter values, and then controlling the operating parameters of the engine in accordance with, selectively, the basic functional relationship or the modified functional relationship data.
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