What is the L-type Electronic Fuel Injection System Like?
4 Answers
L-type electronic fuel injection system uses an air flow meter to directly measure the engine's air intake. The ECU does not need to estimate but can calculate the corresponding fuel injection amount based on the air flow meter signal, thus achieving more precise control of the air-fuel mixture concentration. Here is an introduction to the L-type electronic fuel injection system: 1. Working Principle: The flow-sensing gasoline injection system uses an air flow meter to directly measure the engine's air intake. The computer does not need to estimate but can calculate the corresponding fuel injection amount based on the air flow meter signal. 2. Differences between the L-type and D-type systems: The L-type system uses an air flow meter to directly measure the engine's air intake, resulting in higher control precision compared to the D-type system. The control method of the L-type system is also known as the mass flow control method, and most of its structure is similar to that of the D-type system.
That L-Jetronic fuel injection system has piqued my curiosity since childhood. Essentially, it functions like a vintage smart assistant mounted on car engines—measuring air intake and using an electronic brain to precisely control fuel injection volume. Compared to old carburetors, it's more efficient, fuel-saving, enables quicker engine starts without smoky exhaust, and offers better environmental performance. I've seen several 1980s BMW models equipped with it—simple in structure and easy to maintain, where occasional sensor issues could often be fixed with a simple cleaning. However, for modern cars, it's somewhat outdated now as it relies on air flow meter data, lacking the smart adaptability of contemporary systems. As an early representative of electronic fuel injection, it left a profound mark in automotive evolution history, making it perfect for vintage car enthusiasts to restore and tinker with.
I personally drove a vintage car equipped with this system and found it quite practical. The L-type electronic fuel injection uses an air flow meter to measure intake air, with the ECU adjusting fuel quantity, ensuring even fuel spray and stable engine operation. Its advantages include quick response without sluggishness, especially during cold starts where it doesn't struggle like old carburetors, while also saving fuel and reducing emissions. However, regular sensor maintenance is crucial to prevent dust buildup, which can cause engine vibration and increased fuel consumption. Overall, it enhances driving comfort and stands as a reliable upgrade testament for older-generation vehicles.
The L-type electronic fuel injection system, such as the L-Jetronic system, consists of basic components including an air flow sensor, an ECU control unit, and fuel injectors. It precisely supplies fuel by detecting intake air, simplifying fuel management and replacing mechanical injection. Although not as responsive as modern advanced fuel injection systems, it offers significant advantages such as easy maintenance and low costs. Commonly found in models from the 1970s to 1980s, it ensures efficient engine operation and reduces exhaust emissions.
