How to detect the operating state of the fuel injection system

Abstract

Abstract PURPOSE:To surely detect abnormality in a short time, by mounting a vibration or sound detector sensor to an injection system and comparing a generation timing or mutual relation of peak signal output from said sensor with preobtained standard value. CONSTITUTION:A vibration or sound detector sensor 12 is mounted to the outside of a fuel injection system under test, and its deteted output signal is applied to a computer 29 through an amplifier 20, feature abstracting filter 22, level conversion amplifier 24, absolute value circuit 26 and envelope detection circuit 27. Further a signal, contained with a peak signal corresponding to an operational condition in the injection system, is abstracted from the feature abstracting filter 22. Then in the computer 29, generation timing of the peak signal or relation mutually between the prescribed peak signals is compared with that in case of a standard fuel injection system stored to a memory 31, to decide the operational condition. A decision result is displayed as necessary to a display device 32.

Inventors

• 👤 Susumu Nagai
• 👤 将 永井
• 👤 Kazuhiro Mizushima
• 👤 水島　一祐
• 👤 Tadashi Kawasaki
• 👤 川崎　正
• 👤 Teruo Nakano
• 👤 照夫 中野
• 👤 Kozo Oba
• 👤 大場　厚三

Bibliographic Details