VAZ-2107 injector: fuel consumption. Which is better - injector or carburetor?

On the car VAZ-2107 injector fuel consumption depends on many parameters. Of course, the state of the engine is of great importance - the amount of compression, the level of wear of pistons, rings, valves and their saddles and other components. But not only this affects the consumption of gasoline. The point is that the injection system of injection is completely computerized. Of course, it is not controlled by a state-of-the-art gaming computer, but only by a microprocessor. But this is enough to organize the correct operation of the motor. To learn about all the advantages and disadvantages of the injection injection system, you need to study it in more detail.

General design of the injection system of injection

The first direct injection systems appeared several decades ago. They allowed not only to reduce the base fuel consumption in cars, but also to greatly simplify the management of the car. True, the complexity of the design at the same time increased - there were many sensors and actuators that are not inherent in carburettors. The introduction of such systems became possible only thanks to the development of microelectronics. Since the basis is the control unit, which analyzes every second thousands of signals.

Just think about how many pulses the sensor produces alone? Hundreds per second, and that's a lot. In addition, they all need to be analyzed and correctly reacted to them. But if carburettors work exclusively on the basis of the simplest physical processes, such as the difference in pressure in the chambers, the injector functions only thanks to electronic devices. The pressure is not created by rarefaction in the ramp, but by injecting fuel and air into it. This will be discussed a little later, as well as the question of what is better - the injector or carburetor on the car of the seventh model.

Electronic control unit

Indeed, this is the heart of any injection machine. To understand its work, it is necessary to consider the structural scheme, which includes:

1. Readers (sensors).
2. Implementing mechanisms (РХХ, бензонасос, heater катколлектора).
3. Microcontroller with the required number of I / O ports.

But the problem is that the sensors give different signals. Some have an output of 12 volts, and the second - less than one. And the problem is that on the VAZ 2107 injector fuel consumption will depend on the parameters coming from the sensors, and the microcontroller can only perceive the signal in the range 3.5-5 volts.

Matching the microcontroller with the sensors

Consequently, some signals need to be strengthened, and others should be reduced. For these purposes, intermediate stages (matching devices) are used - operational amplifiers and voltage dividers. With this, everything is clear, but the microprocessor can not even turn on the winding of the electromagnetic relay. For this purpose, special assemblies of Darlington are used. This is a small microcircuit, it is based on amplifying cascades on field-effect transistors. They work in key mode and allow switching currents up to 30 A. And this is quite enough to supply the winding of the electromagnetic injector.

Conduct the alignment of the microcontroller with injectors using an electromagnetic relay can not. The reason for this is the high frequency of the pulses. The relay simply can not manage to make the necessary number of switches per second. From this point of view, the key on the field-effect transistor is much more efficient.

Fuel rail

Directly on the engine is mounted the unit responsible for the injection of the fuel-air mixture into the combustion chambers - ramp and injectors. On the car VAZ-2107 injector fuel consumption depends on how correctly mixes the air with gasoline. And this process takes place exactly in the ramp. In it, under pressure, gasoline is injected. The air that has passed through the air filter is sucked in there. And the proportion should be ideal - 14 parts of air and only one part of gasoline.

Electromagnetic injectors

Below is a table of fuel consumption for an engine with a volume of 1.5 liters, but with a different injection system. In the ramp is maintained a constant pressure, gasoline is in a suspended state, almost foggy peculiar. Separates it from the combustion chamber only the valve of the electromagnetic nozzle. What is this device? It consists of a coil, a core and a valve, which is driven by a current. In carburetors, something similar is also there, the design is very similar - this is an idle solenoid valve . Functions and appearance, of course, are different. The injectors have two states - open and closed. In the first, gasoline is injected with air into the combustion chamber.

Electric fuel pump

But this is the device that is responsible for ensuring that the ramp always has the necessary pressure. How to reduce fuel consumption, will be described below. But it is worth noting that this parameter does not affect the electropump. It is located directly in the tank, combined in a single casing with a gasoline level sensor. Also there is a filter on it. In the people it is called "pampers" for external similarity.

By the way, try to change it as often as possible, otherwise there will be clogged fuel lines and injectors. And cleaning sometimes costs a lot of money. In addition to the electric pump, there is another device that allows to maintain a constant pressure - the regulator on the ramp. With its help, the excess fuel is discharged back to the tank. Therefore, the excess pressure for the system is not terrible.

Is the injector better or worse than the carburetor?

Convenience is the main trump of the injector injection system. In addition, it has a minimal fuel consumption is much lower than that of a carburetor. The reason for this is a more perfect system, control of all engine performance parameters. There are also advantages - there is no suction. The supply of air is handled by the electronic system. At high speeds, the acceleration of the motor is higher.

But at low speeds, unfortunately, the time and power are lower. A very complex design entails expensive maintenance. Without diagnostics, it is sometimes difficult to determine the cause of a car breakdown. Even all these data are enough to try to answer the question, which is better - injector or carburetor. But the final answer still will not be. On the one hand, the injector is better. And on the other hand, it turns out to be somewhat worse.

Is it possible to reduce the consumption of the injector?

And now it's worth talking about how to reduce fuel consumption on the injector engine. The surest way is to change the firmware of the microcontroller. At the same time, a new fuel card on which the engine is running is recorded. The air and gasoline content varies, therefore, power loss occurs. But you get a small advantage. As a result of such manipulations on the VAZ 2107 injector fuel consumption is reduced. However, the maximum speed, power and throttle response of the car also become smaller. Car owners when choosing the firmware are guided by the average figures, which are listed in the table. For comparison, data on a similar engine with a carburetor injection system are presented.