×

Internal combustion engine with on-board diagnostic system for detecting impaired fuel injectors

  • US 5,445,019 A
  • Filed: 04/19/1993
  • Issued: 08/29/1995
  • Est. Priority Date: 04/19/1993
  • Status: Expired due to Fees
First Claim
Patent Images

1. An internal combustion engine comprising:

  • fuel supply means for supplying liquid fuel under pressure to combustion cylinders of the engine, comprising at least one fuel injector operatively connected to a fuel rail;

    fuel injector control means for individually actuating said at least one fuel injector to pass fuel from the fuel rail during a controlled actuation period; and

    an on-board diagnostic system for detecting impaired fuel injectors during engine operation, said on-board diagnostic system comprising;

    pressure sensor means for sensing transient fuel pressure waves in the fuel rail resulting from actuation of the fuel injector and for generating pressure signals based thereon corresponding to fuel quantity passed by the fuel injector during actuation; and

    signal processing means for processing pressure signals from the pressure sensor means and for generating an output signal in response thereto.

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