On-demand from customers AWD methods push the secondary axle by means of an Lively or passive coupling unit or "by an independently powered drive technique". The conventional notes that in some instances, the secondary generate system may also provide the main auto propulsion. An instance is really a hybrid AWD https://groupak.gr/%CE%BF%CF%80%CE%AF%CF%83%CE%B8%CE%B9%CE%BF%CE%B9-%CF%80%CE%AF%CF%83%CF%89-%CF%80%CF%81%CE%BF%CF%86%CF%85%CE%BB%CE%B1%CE%BA%CF%84%CE%AE%CF%81%CE%B5%CF%82