What does high-pressure common rail in diesel engines mean?
1 Answers
High-pressure common rail technology refers to a fuel supply method in a closed-loop system composed of a high-pressure fuel pump, pressure sensor, and ECU, where the generation of injection pressure and the injection process are completely separated. The high-pressure fuel pump delivers high-pressure fuel to a common fuel rail, and precise control is achieved over the fuel pressure within the common rail. Advantages: 1. Flexible adjustment of injection pressure in the high-pressure common rail system: The optimal injection pressure required for different operating conditions can be determined, thereby optimizing the overall performance of the diesel engine. 2. Independent and flexible control of injection timing: Combined with high injection pressure (120MPa to 200MPa), it can simultaneously control NOx and particulate matter (PM) at lower levels to meet emission requirements. 3. Flexible control of injection rate changes: Achieves ideal injection patterns, easily enabling pre-injection and multiple injections, which can reduce NOx emissions while ensuring excellent power and fuel economy. 4. Electromagnetic valve-controlled injectors: High control precision prevents air bubbles and residual pressure in the high-pressure fuel lines, ensuring minimal variation in cyclic fuel injection across the engine's operating range, improving fuel supply uniformity among cylinders, thereby reducing engine vibration and lowering emissions.
