What is common rail direct injection and its advantages in diesel engines?

Common rail injection uses a high-pressure fuel rail (1600-2500 bar) that feeds all injectors, with precise electronic control of injection timing and multiple injection events per cycle. Advantages include independent control of pressure and injection timing, capability for pilot injection (reduces noise and NOx) and post injection (enables DPF regeneration), better atomization for cleaner combustion, and flexibility for various operating conditions. It enables modern diesel engines to meet stringent emissions standards while maintaining efficiency.