Engine detonation detection method and preignition detection method of engine
A detection method and engine technology, applied in the direction of engine components, machines/engines, measuring devices, etc., can solve the problems of poor power, inability to eliminate noise interference with band-pass filter function, cut off fuel, etc., so as to improve the knock detection threshold, The knock detection function is perfect and the effect of suppressing misjudgment
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Embodiment 1
[0042] Engine knock detection methods, such as figure 1 As shown, including the following steps:
[0043] 1. Real-time calculation of the crankshaft phase corresponding to the injector needle valve seating period of each cylinder of the engine under the current working condition, calibrate the crankshaft phase of the knock recognition window of each cylinder of the engine, and calibrate the default background noise Srkr, first knock Threshold, the second knock threshold, the first knock threshold is greater than the second knock threshold;
[0044] 2. Compare the knock recognition window of the current combustion cylinder with the crankshaft phase during the seat period of the injector needle valve of the next combustion cylinder;
[0045] 3. If the injector needle valve seating period of the next combustion cylinder overlaps with the crankshaft phase of the knock recognition window of the current combustion cylinder, it is judged that there is injector seating noise entering the kno...
Embodiment 2
[0054] Based on the engine knock detection method of Embodiment 1, in step 1, the first angle and the second angle are also calibrated, and the first angle is smaller than the second angle;
[0055] In step 5, if knocking of the current combustion cylinder is detected, the ignition angle of the current combustion cylinder is delayed less than the first angle; if it is detected that the current combustion cylinder does not knock, the ignition angle of the current combustion cylinder is not delayed;
[0056] In step 7, if it is detected that the current combustion cylinder is knocking, the ignition angle of the current combustion cylinder is delayed less than the second angle; if it is detected that the current combustion cylinder does not knock, the ignition angle of the current combustion cylinder is not delayed.
[0057] In the engine knock detection method of the second embodiment, if it is detected that the current combustion cylinder is knocking, the ignition angle of the current ...
Embodiment 3
[0059] Based on the engine knock detection method of Embodiment 1, in step 1, the first time and the second time are also calibrated, and the first time is less than the second time;
[0060] In step 4, filter the knock sensor signal integrated quantity ikr of the knock recognition window of the current combustion cylinder within the first time, calculate the background noise of the current cycle of the knock recognition window of the current combustion cylinder, and complete the background noise learning;
[0061] In step 6, filter the knock sensor signal integrated quantity ikr of the knock recognition window of the current combustion cylinder in the second time, calculate the background noise of the current cycle of the knock recognition window of the current combustion cylinder, and complete the background noise learning.
[0062] In the engine knock detection method of the third embodiment, when the seat noise of the injector enters the knock recognition window of the current com...
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