×

Computer based engine analyzer with hardware cylinder counter

  • US 4,425,791 A
  • Filed: 12/14/1981
  • Issued: 01/17/1984
  • Est. Priority Date: 12/14/1981
  • Status: Expired due to Term
First Claim
Patent Images

1. An engine test apparatus for use in testing of a multi-cylinder internal combustion engine, the apparatus comprising:

  • cylinder clock means for deriving a cylinder clock signal representative of sequential operation of each cylinder of the engine, the cylinder clock signal exhibiting a predetermined signal transition for each cylinder;

    a presettable digital cylinder counter for counting down from an initial count (J) to zero in response to the predetermined signal transitions of the cylinder clock signal, the cylinder counter having output terminals for providing a digital cylinder count (Q) which is decremented with each predetermined signal transition, and input terminals for receiving the initial count (J) which is representative of the number of cylinders of the engine;

    means for producing a signal when the digital cylinder count (Q) reaches zero;

    reset means for resetting the cylinder counter to the initial count (J) at the input terminals in response to the signal provided when the digital cylinder count (Q) reaches zero;

    electrical test means for selectively deriving, from the engine, electrical signals indicative of operation of a system or component of the internal combustion engine;

    operator input means for providing operator input signals indicative of a selected test to be performed;

    display means for displaying visually a test result of the selected test performed; and

    digital computer means for controlling operation of the electrical test means as a function of the operator input signals and the digital cylinder count (Q) and for controlling the display means as a function of the electrical signals from the electrical test means, the digital computer means providing the initial count (J) to the input terminals of the presettable digital cylinder counter.

View all claims
  • 8 Assignments
Timeline View
Assignment View
    ×
    ×