On-demand from customers AWD units push the secondary axle via an active or passive coupling product or "by an independently run generate system". The standard notes that in some cases, the secondary generate method could also provide the principal auto propulsion. An instance is usually a hybrid AWD car in https://felixqhugr.jiliblog.com/90082412/not-known-factual-statements-about-αξεσουάρ-αυτοκινήτων-4χ4