So i have a multi module application , but when i create a BlogController , it does not work , but BloggController does
What you mean does not work ? What error you have etc ?
Probably a routing issue from misconfiguration. If you have a module named "blog", the application could confuse the module with the controller if you're using the path to decide which module to use. If you have two BlogControllers, there could be a module conflict, or perhaps you have a blogAction in your IndexController which it's getting confused with. It could be something as simple as a typo: perhaps your file doesn't match the class name. Or maybe it's a namespace issue.
Without some more details, about the best I can do is link you to a role model such as :
https://github.com/phalcon/mvc/blob/master/multiple-service-layer-model/apps/config/modules.php
https://github.com/phalcon/mvc/blob/master/multiple-service-layer-model/apps/config/services.php
https://github.com/phalcon/mvc/blob/master/multiple-service-layer-model/apps/modules/frontend/Module.php