US 12,473,869 B2
Pre-ignition determining apparatus for internal combustion engine
Norihito Hanai, Toyota (JP); and Masanori Toya, Inazawa (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Aug. 22, 2024, as Appl. No. 18/811,893.
Claims priority of application No. 2023-150913 (JP), filed on Sep. 19, 2023.
Prior Publication US 2025/0092840 A1, Mar. 20, 2025
Int. Cl. F02D 41/22 (2006.01); F02B 43/00 (2006.01)
CPC F02D 41/22 (2013.01) [F02B 43/00 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An apparatus configured to determine an occurrence of pre-ignition based on an output value of a vibration sensor provided in an internal combustion engine using hydrogen as fuel, the apparatus comprising:
processing circuitry,
wherein the processing circuitry is configured to execute:
a filtered signal generation process of receiving an output signal of the vibration sensor in a detection period, which is a predetermined period prior to an ignition timing of an air-fuel mixture, and generating a filtered signal by performing a filtering process on the output signal;
an absolutizing process of generating an absolute value signal obtained by converting the filtered signal into an absolute value;
an accumulation process of calculating an accumulated value of the absolute value signal within the detection period; and
a determination process of determining the occurrence of pre-ignition based on the accumulated value.