×

Cooling fan assisted engine-off natural vacuum test

  • US 9,140,627 B2
  • Filed: 10/29/2013
  • Issued: 09/22/2015
  • Est. Priority Date: 10/29/2013
  • Status: Active Grant
First Claim
Patent Images

1. A method for a vehicle fuel system, comprising:

  • during an engine-off condition, including an ambient temperature within a threshold range, operating a cooling fan to increase a fuel tank vacuum including operating the cooling fan for a first test duration, the first test duration based on an amount of stored battery charge; and

    indicating leaks in the vehicle fuel system based on the increased vacuum.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×