Rajan Wilcox
The amount of fuel injected into a cylinder depends on several factors, including the type of engine, the number of cylinders, and the gear ratio. For example, a 10-cylinder, 2-stroke engine used in cruise ships injects approximately 35 grams of fuel per injection, while a car engine with 4 cylinders may consume around 19.63 milliliters of fuel per combustion. Modern diesel engines inject fuel gradually to ensure a slower burn and reduce peak pressures, temperatures, engine noise, and vibration. The calculation of fuel consumption inside a cylinder involves considering factors such as air mass, fuel mass, and gasoline density.
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What You'll Learn
Direct fuel injection
The first GDI engine was introduced in 1925 for a low-compression truck engine, and several German cars used a Bosch mechanical GDI system in the 1950s. However, usage of GDI remained rare until an electronic GDI system was introduced in 1996 by Mitsubishi for mass-produced cars. GDI has since seen rapid adoption by the automotive industry.
In GDI systems, the fuel injectors are mounted in the cylinder head and spray the gasoline into the combustion chamber from a fuel rail. The fuel injectors must withstand high pressures and temperatures, with GDI systems typically operating at 2,000 psi or higher, and some systems operating at pressures between 2,000 and 3,000 psi or even higher. The high-pressure fuel pump overcomes the cylinder pressure, allowing finely atomized fuel to enter the cylinder. GDI engines also utilize a high-pressure fuel rail and high-pressure relief valves in case of a malfunction.
The engine control unit (ECU), also known as the engine control module (ECM), is the "brain" of the GDI system. It uses sensors and algorithms to control when and how much fuel is injected into each cylinder. GDI enables precise control over the amount of fuel and the timing of the injection according to load, allowing the engine to run efficiently in all situations. GDI also increases engine efficiency and specific power output while reducing exhaust emissions, fuel consumption, and fuel usage.
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Indirect fuel injection
Multi-port or indirect fuel injection (MPI) is one of the most common fuel injection systems found in cars and trucks today. Throttle body injection (TBI), a type of indirect fuel injection, was primarily used in the 1980s and 1990s and is still used with Electronic Fuel Injection (EFI) conversion kits. TBI systems typically have two fuel injectors mounted at the throttle body opening and run on around 12 psi of fuel pressure.
Multi-port injection, on the other hand, utilizes one fuel injector per cylinder, which is mounted on the intake manifold. The fuel injector sprays fuel directly into the intake runner behind the intake valve. MPI systems are computer-controlled and operate at approximately 40-50 psi of fuel pressure. They have been the designated choice for vehicle manufacturers due to their precision and adaptability.
The amount of fuel injected into a cylinder varies depending on the engine and vehicle type. For example, a 10-cylinder cruise ship engine with a 2-stroke cycle would have 10 power strokes per revolution, resulting in approximately 35 grams of fuel injected per injection. In another example, a car with a 4-cylinder engine and a fuel consumption of 29.45L at 3000 rpm would consume 4.91mL of fuel per cylinder per combustion.
Indirect injection engines, compared to direct injection engines, tend to produce peak torque sooner in the rpm range, but direct injection engines produce more torque overall. Direct injection engines are considered more efficient due to their higher injection pressure, more precise injection events, and the absence of a pre-chamber. However, indirect injection engines, such as those found in Kubota vehicles, are described as smooth, powerful, and quiet.
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Multi-point injection
In a multi-point injection system, each cylinder has its own fuel injector, which is installed very close to the intake valve. The fuel injectors deliver an optimum quantity of fuel into the combustion chamber, resulting in better atomization and swirl of fuel. The precise delivery of fuel ensures that there is negligible fuel condensation outside the intake manifold. The Electronic Control Unit (ECU) is a crucial component of the multi-point injection system, as it calculates the exact amount of fuel required for each cylinder and the appropriate moment to inject it during the engine's intake stroke. The ECU gathers data from various sensors, such as the Mass Airflow Sensor (MAF) and Throttle Position Sensor (TPS), to monitor engine conditions and adjust the fuel-air mixture accordingly.
The development of multi-point injection technology has evolved over the years, with the introduction of digital electronics and advancements in engine control units. The Bosch Motronic multi-point fuel injection system, introduced in the 1970s, was the first mass-produced system to utilise digital electronics. Since then, multi-point injection has become a vital element in petrol and CNG cars, offering improved efficiency and performance.
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Fuel atomization
The degree of fuel atomization significantly impacts engine performance and emissions. Investigations have shown that "good" atomization, with droplet sizes ranging from 10 to 20 μm, results in a homogeneous charge of vaporized gasoline and air at ignition. On the other hand, "bad" atomization, with larger droplet sizes of 400 to 700 μm, leads to an inhomogeneous charge and stratification of the fuel-air mixture.
The timing and pressure of fuel injection play a crucial role in achieving effective fuel atomization. Advancing the injection timing provides the fuel with sufficient time to evaporate, while increasing the air injection pressure contributes to a uniform distribution of the mixed gas in the cylinder. Additionally, the application of direct injection (DI) technology, such as air-assisted atomization, can significantly improve the atomization effect, promoting stable fuel-air mixing and combustion.
Modern diesel engines utilize high-pressure injectors, reaching up to 2,000 bar, to ensure that every fuel droplet is atomized. These injectors break the fuel into micron-sized particles, significantly increasing the surface area of the fuel. This increased surface area facilitates rapid heat absorption, temperature rise, and oxygen access, which are essential for efficient combustion.
The process of fuel atomization is a key factor in the intricate combustion sequence within diesel engines. By breaking down the liquid fuel into tiny droplets, atomization ensures optimal engine performance, reduces fuel loss, and minimizes harmful emissions. It is a critical yet often overlooked aspect of power generation in diesel engines.
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Injection pressure
The injection pressure should be high enough to fill the mold cavity completely without causing any defects or voids in the finished product. At the same time, it should not be so high that it causes the mold to break or the plastic to degrade. The fill pressure is the pressure required to fill the mold to a certain level, typically 95% to 98% of the part volume. The pack pressure is applied after the mold is filled to ensure the plastic gets into all corners and crevices of the mold cavity. Hold pressure is applied during the plastic cooling phase to ensure the plastic remains in contact with the mold surfaces and to control shrinkage.
The injection pressure is influenced by the injection speed settings, with faster injection speeds requiring higher pressure. The temperature of the resin also affects the injection pressure, with lower temperatures requiring higher pressure. The intrinsic viscosity of the material is another factor, where higher viscosity requires higher pressure.
In hydraulic machines, injection pressure occurs in the injection cylinder, while in electric machines, it occurs in front of the plasticizing screw. The pressure is provided by the hydraulic system of the injection molding machine and acts on the injection cylinder, transforming into injection pressure. This pressure provides the kinetic energy to drive the hydraulic oil.
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Frequently asked questions
The amount of fuel injected into a cylinder in a car depends on the type of engine and the number of cylinders. For example, a 4-cylinder car engine with a combustion volume of 4.91 mL per cylinder will consume 19.63 mL of fuel per combustion.
There are two basic types of fuel injection systems: direct and indirect. In direct injection systems, fuel is injected directly into the combustion chamber, whereas in indirect injection systems, fuel is injected into the intake runner before entering the combustion chamber.
Direct fuel injection allows for more precise control of fuel delivery and improved fuel economy. It also enables higher injection pressures, which can lead to better fuel economy and reduced emissions.
Modern diesel engines use common rail injectors, which allow for multiple, electronically-controlled injection events. This helps improve efficiency, smoothness, and emissions performance. Diesel fuel is injected at the top of the compression stroke, and the burn is controlled directly by the injection of fuel.
