Rajan Wilcox
Fuel injection systems are pivotal in delivering precise fuel amounts to a car's engine. They have been around since the 1950s, but electronic fuel injection systems, which are controlled by an engine control unit, are a more recent innovation. All cars sold in the United States have fuel injection systems, and they have gradually replaced carburetors in passenger car petrol engines since the early 1990s. Fuel injection systems offer better fuel efficiency, performance, and longevity, and they also reduce emissions.
| Characteristics | Values |
|---|---|
| History | Fuel injection has been around since the 1930s and 40s for diesel engines, and since the 1950s for petrol engines. |
| Function | Fuel injection systems deliver precise fuel amounts to the engine, atomizing the fuel through a small nozzle under high pressure. |
| Benefits | Fuel injection systems offer better fuel efficiency, improved performance, and lower emissions. They also increase engine lifespan by reducing engine wear. |
| Types | There are two main types of fuel injection systems: internal and external. External mixture formation systems are called manifold injection systems, which can be multi-point or single-point. Internal mixture formation systems include direct and indirect injection, with common-rail injection being the most common type. |
| Components | Fuel injection systems consist of components such as fuel pumps, injectors, sensors, and a fuel pressure regulator. |
| Maintenance | Regular maintenance and check-ups are important to ensure the longevity and efficiency of the fuel injection system. Issues such as clogged injectors, faulty sensors, and worn-out pumps can affect the system's performance. |
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What You'll Learn
History of fuel injection
Fuel injection systems have been around for over a century, with the earliest recorded use of fuel injectors in 1902 by French aviator Leon Levavasseur, who implemented a prototype version of an injection system in his Antoinette 8V aircraft. However, it was during World War II that fuel injection systems gained prominence, particularly in military aircraft production. Germany began equipping its fighter aircraft with direct fuel injection to prevent engine stall-out during high-speed aerial maneuvers, giving them an advantage over enemy planes. This technology was soon adapted for the automotive industry, with the first fuel injection for petrol engines appearing in 1952 with the Goliath GP700.
In the 1950s, fuel injection systems began to enter the automotive market, with companies like Bosch and Mercedes-Benz dominating the early era of fuel injection in cars. By the 1970s, fuel injection was appearing in mainstream cars, and in the 1980s, the electronic fuel injector spread almost universally across Europe and the United States. The increased computing power and smaller size of EFI modules during this decade made them more attractive for engine design. Additionally, the need to reduce air pollution and comply with tightening regulations also contributed to the decline of carburetor technology and the rise of fuel injection.
The 1990s marked a significant shift, with it becoming impossible to buy a new car without fuel injection in Europe. Since the mid-1990s, all newly introduced engines in Europe have been required to be fuel-injected. This trend was similar in the United States, with the 1990 Subaru Justy being the last car sold with a standard gasoline carburetor engine. The 1991 model of the same car was manufactured and sold with a new fuel injector, marking the transition to fuel injection technology.
Today, all cars are fitted with electronically controlled fuel injection systems, which use a wide array of data sent to the control unit from various sensors. These systems offer increased fuel economy, power, and efficiency compared to carburetor engines. While there are different types of fuel injection systems, such as single-point and multi-point injection, they all share the absence of carburetion and the precise control of the fuel-air mixture.
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How fuel injection works
Fuel injection is the introduction of fuel into an internal combustion engine, usually an automotive engine, via a fuel injector. All compression-ignition engines (e.g. diesel engines) and many spark-ignition engines (i.e. petrol engines) use fuel injection.
Fuel injection has been around since the 1950s and was first mass-produced for passenger cars in the late 1930s and early 1940s. The primary difference between carburetion and fuel injection is that fuel injection atomises the fuel through a small nozzle under high pressure, while carburetion relies on suction created by intake air accelerated through a Venturi tube to draw fuel into the airstream. The term 'fuel injection' is vague and comprises various distinct systems with fundamentally different functional principles. The only thing all fuel injection systems have in common is the absence of carburetion.
There are two main functional principles of mixture formation systems for internal combustion engines: internal and external. A fuel injection system that uses external mixture formation is called a manifold injection system. There are two types of manifold injection systems: multi-point (or port) and single-point (or throttle body) injection. Multi-point injection injects fuel into the intake ports just upstream of each cylinder's intake valve, rather than at a central point within an intake manifold. Typically, multi-point injected systems use multiple fuel injectors, but some systems, such as GM's central port injection system, use tubes with poppet valves fed by a central injector instead of multiple injectors. Single-point injection (or throttle-body injection) uses one injector in a throttle body mounted similarly to a carburettor on an intake manifold.
Internal mixture formation systems can be separated into several different varieties of direct and indirect injection, the most common being the common-rail injection, a variety of direct injection. Direct injection means that the fuel is injected into the main combustion chamber of each cylinder. The air and fuel are mixed only inside the combustion chamber. Therefore, only air is sucked into the engine during the intake stroke. The injection scheme is always intermittent (either sequential or cylinder-individual). This can be done either with a blast of air or hydraulically, with the latter being more common in automotive engines. Typically, hydraulic direct injection systems spray fuel into the air inside the cylinder or combustion chamber. Direct injection can be achieved with a conventional helix-controlled injection pump, unit injectors, or a sophisticated common-rail injection system.
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Benefits of fuel injection
Fuel injection systems are now standard in all cars sold in the United States, replacing the carburetor systems of older vehicles. Fuel injection offers several benefits over carburetors, including improved fuel efficiency, reduced emissions, and enhanced engine performance.
One of the primary advantages of fuel injection is its ability to optimize fuel efficiency. By injecting fuel directly into the engine's manifold or cylinder, the system ensures that the engine receives the precise amount of fuel it needs. This precise fuel metering leads to a more efficient combustion process, resulting in improved gas mileage. A two-year comparative study found a significant 15% increase in fuel efficiency following a professional fuel injection service. Additionally, the atomization of fuel, where it is transformed into a fine mist, further enhances combustion and fuel efficiency.
Fuel injection systems also contribute to reduced emissions. By providing a more accurate air-to-fuel ratio, these systems minimize engine exhaust emissions, leading to a cleaner environment. The oxygen sensors in the system monitor the amount of oxygen in the exhaust, allowing the engine control unit (ECU) to adjust the air-to-fuel ratio in real time. This closed-loop control was not feasible with carburetor systems, making fuel injection a more environmentally friendly option.
Furthermore, fuel injection enhances engine performance and response. The system's ability to provide the engine with the exact amount of fuel required results in a smoother and more powerful engine operation. The absence of carburetion and the precise fuel metering contribute to a more immediate engine response, especially when accelerating. This improved response is beneficial for car enthusiasts seeking peak performance.
In addition to the performance benefits, fuel injection systems offer long-term advantages for vehicle health and maintenance. Regular fuel injection service and maintenance can extend the life of the injectors and ensure optimal engine performance. While professional service is recommended for the best results, some car owners may opt for do-it-yourself cleaning methods. Overall, fuel injection technology provides a more efficient, environmentally friendly, and responsive driving experience.
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Types of fuel injection systems
Fuel injection systems are of two main types based on their functional principles of mixture formation systems for internal combustion engines: internal and external. A fuel injection system that uses external mixture formation is called a manifold injection system, while internal mixture formation systems can be separated into several different varieties of direct and indirect injection.
Manifold Injection Systems
Manifold injection systems are common in petrol-fuelled engines such as the Otto engine and the Wankel engine. In a manifold injection system, air and fuel are mixed outside the combustion chamber so that a mixture of air and fuel is sucked into the engine. The two main types of manifold injection systems are multi-point injection and single-point injection.
Multi-Point Injection
Also called port injection, multi-point injection systems inject fuel into the intake ports just upstream of each cylinder's intake valve, rather than at a central point within an intake manifold. Typically, multi-point injected systems use multiple fuel injectors, but some systems, such as GM's central port injection system, use tubes with poppet valves fed by a central injector instead of multiple injectors.
Single-Point Injection
Also called throttle-body injection, single-point injection uses one injector in a throttle body mounted similarly to a carburettor on an intake manifold. As in a carburetted induction system, the fuel is mixed with the air before entering the intake manifold. Single-point injection was a relatively low-cost way for automakers to reduce exhaust emissions to comply with tightening regulations while providing better "driveability" (easy starting, smooth running, no engine stuttering) than could be obtained with a carburettor.
Direct Injection
Direct injection takes the fuel injection concept to its maximum extent, injecting fuel directly into the combustion chambers, past the valves. More common in diesel engines, direct injection is starting to be used in gasoline engine designs, sometimes called DIG for direct-injection gasoline. Fuel metering is more precise than in other injection schemes, and the direct injection gives engineers another variable to influence precisely how combustion occurs in the cylinders.
Indirect Injection
Indirect injection, also called pre-chamber injection, involves injecting fuel into a pre-chamber where it begins to combust before entering the main combustion chamber. This type of injection is used in Akroyd engines and some diesel engines.
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Fuel injection maintenance
Fuel injection systems are very efficient, but they do require maintenance. A fuel injection system has to be in good working condition for a vehicle to operate. A dirty or clogged fuel injection system can affect the flow of fuel into the engine where combustion occurs. This can lead to a decrease in fuel economy and poor engine performance.
A complete fuel injection service involves several steps to keep the system functioning properly. These include flushing the air passages and throttle valve, and an engine computer checkup to ensure the correct air/fuel mixture is flowing through the system. A fuel injection service is recommended about every 45,000 miles or every three years, but this can vary depending on the manufacturer.
Fuel injectors can become clogged with carbon deposits, leading to a rough idle, lack of power, and hesitation when accelerating. A fuel injector cleaning can be done by pouring a cleaning solvent into a pressure canister and attaching it to the fuel line, or by using a gas tank fuel injector cleaning product. However, some shops may recommend routine injector cleaning as a preventative measure, when it is not actually necessary. If you are unsure, you can check the car maker's maintenance guide.
There are two main functional principles of mixture formation systems for internal combustion engines: internal and external. External mixture formation systems are called manifold injection systems, which can be multi-point or single-point injection. Internal mixture formation systems include direct and indirect injection, with common-rail injection being the most common type of direct injection.
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Frequently asked questions
A fuel injection system is a mechanism that delivers precise fuel amounts to a car's engine. It is made up of components like fuel pumps, injectors, and sensors.
Fuel injection systems use either a blast of air or hydraulics to spray fuel into the air inside the cylinder or combustion chamber. The amount of fuel supplied to the engine is determined by the amount of time the fuel injector stays open, which is called the pulse width.
Fuel injection systems offer better fuel efficiency and performance compared to carburetors. They also help meet stricter emissions requirements and increase engine lifespan.
