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Compression rate analyzer

  • US 4,292,841 A
  • Filed: 07/11/1979
  • Issued: 10/06/1981
  • Est. Priority Date: 07/11/1979
  • Status: Expired due to Term
First Claim
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1. Apparatus for monitoring the performance of fuel injected internal combustion engines of the type having injection nozzles extending into the respective engine cylinders, said apparatus comprisingtransducer means adapted to be coupled to a selected one of said injector nozzles and capable of producing a first signal which varies substantially in accordance with the time-rate-of-change of the pressure exerted on said selected nozzle from within said cylinder,circuit means responsive to said transducer output signal for developing a second electrical signal the amplitude of which corresponds to the maximum amplitude of said transducer output signal,signal conversion means coupled to said circuit means for producing a numerically coded electrical representation of said second electrical signal,first readout means for manifesting said numerically coded electrical representation to the operator as a visual indication of the performance of said selected engine cylinder,a tachometer circuit coupled to said transducer means and adapted to produce at least one third electrical signal which varies in accordance with the primary frequency of said transducer signal, andsecond readout means driven by said tachometer circuit for manifesting to the operator a numerical value corresponding to the magnitude of said speed-related signal as an indication of engine speed.

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