On-line diagnosis and control method for knockings of internal-combustion engine
A control method and internal combustion engine technology, applied in engine control, electrical control, mechanical equipment, etc., can solve problems such as inability to accurately identify knocking, and achieve the effect of overcoming the neglect of the frequency characteristics of the pressure in the cylinder and avoiding misjudgment
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[0022] See figure 1 with figure 2 , The method for on-line diagnosis and control of internal combustion engine knock of the present invention mainly includes the following steps: start the engine, warm up the engine for 20 minutes to ensure that the circulatory systems enter the normal working state; use the in-cylinder pressure sensor and the photoelectric encoder to synchronously determine the engine cylinder Internal pressure p crankshaft angle Signal, and import the measured signal into the engine knock on-line diagnosis processor for analysis; adjust the engine work load to make it work in the low-speed and high-load working area that is prone to knocking; compare the processor analysis results online under each crank angle Peak pressure p max 、The rate of increase in cylinder pressure Characteristics of cylinder pressure oscillation And the detonation center frequency characteristic f center Whether it exceeds the knock threshold predetermined by the processor; identi...
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