Kenyon & Kenyon
Device for determining misfiring of cylinders in multi-cylinder engines
 A torque sensor which can detect instantaneous output torque of the engine is disposed on the output shaft of the engine, and the output signal thereof is frequency-analyzed to extract a half synchronous frequency component having a frequency equals to a half of the number of the revolutions of the engine per second and a synchronous frequency component having a frequency equals to the number of the revolutions of the engine per second, the electronic control unit (ECU) of the engine determines the misfiring mode of the engine including the number of the misfiring cylinders and the interval thereof in the firing order of the engine based on the amplitude of the frequency components and the waveform thereof, then the ECU determines the misfiring cylinders based on the determined misfiring mode and the phase angle of the frequency components of the torque sensor relative to a reference crank angle signal. 
Toyota Jidosha Kabushiki Kaisha Kabushiki Kaisha Toyota Chuo Kenkyusho
G
G01M
inventional
Yuji Kazuhiro Masanori Kouji Masaharu Yutaka Yutaka
Nishibe Sakurai Miyashita Tsukada Takeuchi Obuchi Nonomura