×

On-board diagnostic catalyst monitoring system

  • US 6,532,734 B1
  • Filed: 02/01/2002
  • Issued: 03/18/2003
  • Est. Priority Date: 02/01/2002
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method for determining the effectiveness of a catalyst having both first, relatively high oxidizable material provided to remove emissions from the exhaust of an internal combustion engine and a second, relatively low oxidizable material provided to remove emissions from such exhaust, such method comprising:

  • measuring a difference in oxygen content upstream and downstream of the catalyst while the engine is producing the exhaust to determine the effectiveness of the first material; and

    determining the effectiveness of the second material by comparing time delay in a property of the exhaust as such exhaust passes through the catalyst.

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