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Apparatus for deciding engine-oil replacing time for an automobile

  • US 5,043,697 A
  • Filed: 09/21/1990
  • Issued: 08/27/1991
  • Est. Priority Date: 09/25/1989
  • Status: Expired due to Fees
First Claim
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1. An apparatus for deciding engine-oil replacing time for an automobile on the basis of input from the ignition coil comprising:

  • a) a pulse input unit including a waveform shaping circuit into which is input a pulse generated by the ignition coil during the rotation of the engine of an automobile to calculate rotational frequency of the engine on the basis of said pulse;

    b) a rotational frequency integration unit for receiving a signal of said pulse input unit and for producing an integrated value based on the rotational frequency of the engine, andc) a display unit into which is input the integrated value from said rotational frequency integration unit and in which a degree of oil degradation on the basis of said integrated value is displayed.

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