Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6598470 | Method for the testing of an exhaust gas recirculation system | Wolfgang Ludwig, Hong Zhang | 2003-07-29 |
| 6588251 | Method for checking the dynamic behavior of a measuring sensor in the exhaust tract of an internal combustion engine | Hong Zhang, Jürgen Rössler | 2003-07-08 |
| 6438947 | Method for adapting a raw NOx concentration value of an internal combustion engine operating with an excess of air | Wolfgang Ludwig, Hong Zhang | 2002-08-27 |
| 6347513 | Method for regenerating a NOx storage catalytic converter for an internal combustion engine | Hong Zhang | 2002-02-19 |
| 6301878 | Method and apparatus for exhaust gas cleaning with trim control | Hong Zhang, Juergen Roessler | 2001-10-16 |