==Acronyms==The automotive manufacturers refer to their common rail engines by their own brand names:* Ashok Leyland: CRS (used in U Truck and E4 Busses)* BharatBenz: 4d34i (used in 914R and 1214R)* BMW: D (also used in the Land Rover Freelander as TD4)* Chevrolet: VCDi (licensed from VM Motori)* Citroen:HDI* Cummins and Scania: XPI (developed under joint venture)* Cummins: CCR (Cummins pump with Bosch injectors)* Daimler: CDI (and on Chrysler's Jeep vehicles simply as CRD)* Fiat Group (Fiat, Alfa Romeo and Lancia): JTD (also branded as MultiJet, JTDm, and by supplied manufacturers as CDTi, TiD, TTiD, DDiS and Quadra-Jet)* Ford Motor Company: TDCi (Duratorq and Powerstroke)* Honda: i-CTDi and i-DTEC* Hyundai and Kia: CRDi* IKCO: EFD* Isuzu: iTEQ* Jeep: CRD* Komatsu: Tier3, Tier4, 4D95 and higher HPCR-series* Mahindra: CRDe, DiCR, m2DiCR* Mazda: MZR-CD and Skyactiv-D (are manufactured by the Ford and PSA Peugeot Citroen joint venture) and earlier DiTD* Mitsubishi: DI-D (mainly on the recently developed 4N1 engine family)* Nissan: dCi (Infiniti uses dCi engines, but not branded as dCi)* Opel: CDTI* Proton: SCDi* PSA Peugeot Citroën: HDI or HDi (developed under joint venture with Ford) – See PSA HDi engine* Renault: dCi (joint venture with Nissan)* SsangYong: XDi (most of these engines are manufactured by Daimler AG)* Subaru: TD or D (as of Jan 2008)* Tata: DICOR and CR4* Toyota: D-4D and D-Cat* Volkswagen Group (Volkswagen, Audi, Seat and Skoda): TDI (more recent models use common rail, as opposed to the earlier unit injector engines)* Volvo: D and D5 engines (some are manufactured by Ford and PSA Peugeot Citroen), Volvo Penta D-series engines==Principles==Solenoid or piezoelectric valves make possible fine electronic control over the fuel injection time and quantity, and the higher pressure that the common rail technology makes available provides better fuel atomisation.
Moderni common rail sistemi uporabljajo elektronsko (za razliko od mehanskih) krmiljene injektorje, ki jih kontrolira ECU (engine control unit).