It mainly depends on whether the modifications and improvements have reached a certain level and whether the scope of your patent is well written:
1. If it reaches a level where you can apply for a new patent, and it is consistent with your If the patent cannot constitute a parent patent, there will be no infringement! If it forms a parent-child patent relationship with your patent and you apply for a patent, it constitutes a cross-licensing relationship; if you do not apply for a patent, it is an infringement!
2. If it does not reach the level where you can apply for a new patent, it is an infringement!
Legal and technical issues are intertwined, so it is recommended to consult a patent agent or lawyer.