Knock control by reduction of injection period

Abstract From the Canadian patent

A method of operating an internal combustion engine to control "knock" therein, by injecting a metered quantity of fuel entrained in a gas directly into the engine combustion chamber and controlling the timing of injection of the fuel into the combustion chamber. The control of timing of injection being effected by setting the time of the end of the period of injection in relation to the engine cycle, and reducing the duration of the injection period in response to detection of "knock" in the engine above a predetermined level. The duration of injection is reduced in a stepwise manner one step each cycle until "knock" is eliminated or reduced below the predetermined level.