Multi point sequential injection9/13/2023 ![]() By reducing the number of mechanical parts, car manufacturers hope to reduce production costs and create devices that are less susceptible to breakdown due to physical stress. Two exciting ways that fuel injection systems are being perfected is the replacement of moving parts with stationary ones and solid parts with intangible substances. As fuel becomes more expensive and the efficiency of these engines increases relative to the costs,they’ll become more popular and more widely available. Because of the greater fuel efficiency, automakers are currently working on gasoline direct injection systems to reduce their emissions and bring down the cost. However, to handle its higher emission of NOx emissions (nitrogen oxides), the GDI system requires a more costly catalytic converter than a standard engine does. The b uses data from various sensors to time the injection of the fuel into the cylinder and regulate the resultingfuel/air mixture for maximum efficiency under varying driving conditions.Īlthough a gasoline direct injection system is currently more expensive to build than a standard engine, it measures fuel so precisely that you get the most bang for the buck. Instead of being mixed with air to form a fuel/air mixture prior to injection, the gasoline is injected directly into each engine cylinder. It resembles diesel technology but uses gasoline instead of diesel fuel. The gasoline direct injection (GDI) system is relatively new in the United States but is expected to grow more popular as time goes on. (For example, if you have a six-cylinder multi-port fuel-injected engine that’s simultaneously fired, three of the six injectors are pulsed together, and then the other three injectors are pulsed.) In addition, emission levels are lower in an SFI system, but the system requires a separate electricalcircuit for each injector. This type of system is more efficient than a system whose injectors fire simultaneously. Because each injector opens individually just before its intake valve opens, the fuel isalways sprayed right into an open port and therefore stays in suspension. More recent fuel-injected engines feature sequential fuel injection (SFI) in which the fuel injectors fire in sequence rather than all at once. The ECU completes the electrical circuit to the injector solenoid for the proper injector pulse width, and fuel under pressure is injected into the intake port just before the intake valve. This information makes the system respond faster and results in greater fuel economy than older vehicles achieved with throttle-body fuel injection.ģ. These sensors are so perceptive that they even check the weather how much weight you're carrying in the vehicle and whether you're starting up, speeding up, slowing down, or idling at a light. A whole bunch of sophisticated sensors measure a variety of factors and send messages to the ECU, which decides how much fuel to inject at any given time.
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