×

Method of checking for purge flow in an evaporative emission control system

  • US 5,641,899 A
  • Filed: 03/05/1996
  • Issued: 06/24/1997
  • Est. Priority Date: 03/05/1996
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of checking for purge flow in an evaporative emission control system, said method comprising the steps of:

  • determining if there is a fault in a leak detection pump;

    de-energizing the leak detection pump if there is a fault;

    determining the state of a leak detection pump switch;

    concluding a pump switch closed state if the pump switch is not opened;

    concluding a pump switch opened state if the pump switch is not closed; and

    monitoring a purge duty cycle until the evaporative emission control system is depressurized.

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