Fuel supply method: the same row of multi point EFI and direct injection, which way is fuel saving a

There are advantages, the combustion of direct injection in the cylinder will be more rapid, and the power will be more direct, but in this case, there will be a hidden danger that the combustion is not sufficient, and it is easy to produce carbon deposits.

This relatively speaking, the fuel supply method of direct injection in the cylinder is relatively fuel-efficient, and the power performance is also relatively strong, because her fuel utilization rate is relatively high. Therefore, if you have a choice, it is best to choose a vehicle with direct injection of fuel supply.

Direct injection has better fuel utilization than multi-point EFI! Burn completely! Exhaust emissions are good! Theoretically, it has no effect on dynamics! However, direct injection is more fuel-efficient than more electric injection!

It can't be said that the horsepower is bigger, and the advantage of multi-point spraying is that the gasoline is more reasonably distributed to each cylinder, and the combustion is more sufficient, so the fuel consumption will be relatively reduced.

The direct injection of waste oil, the engine power is slightly larger than that of multi-point EFI, and the multi-power of oil injection must be larger, and the better point of multi-point EFI. ^_

1. The electric injection is to inject the fuel into the intake pipe and mix it with the air in the form of electronic control, and then the oil-gas mixture is sucked into the cylinder by the suction stroke of the engine;

2. Direct injection in the cylinder means that the fuel injector is moved from the intake manifold to the inside of the cylinder, so the amount of oil and gas in the cylinder will not be affected by the opening and closing of the intake valve, but directly by the computer to automatically determine the timing and amount of fuel injection;

3. Because the mixing space and time of oil and gas are quite short, the direct injection system in the cylinder must rely on high pressure to press the fuel from the fuel injector into the cylinder to achieve a high degree of atomization.

Direct injection is good. Differences between direct-injection and EFI engines:

Throttle opening control is different.

The direct-injection engine is controlled by the speed, and the throttle opening knob is manually controlled and the power mode switch is manually selected to control the opening of the throttle, and the overall structure is relatively simple. Then, according to the driver's operation idea, the computer ECU determines an optimal throttle opening position (i.e., the optimal speed value of the engine) according to different power modes and working modes, load conditions and operating conditions.

The disadvantage is that because the running speed of diesel engine is very high, its fuel injection time is very short, only a few thousandths of a second, and the pressure of the high-pressure oil pipe everywhere changes with the change of time and position in the injection process, and because of the compressibility of diesel fuel and the pressure change fluctuation of diesel oil in the high-pressure oil pipe, just make the actual fuel injection state and the plunger fuel supply law that the fuel injection pump stipulates are very different. We know that secondary fuel injection is not fully burned, so we increase the emissions of hydrocarbons and smoke, which increases fuel consumption.

Engines with high-pressure common rail technology usually do not mention how many grams of oil are sprayed per second, and are generally expressed as how many milliliters are sprayed per cycle.

Direct injection is also a kind of electric injection, the full name is called direct injection in the cylinder. The representatives of direct injection include Volkswagen's TSI, TFSI, and GM's SIDI. In-cylinder direct injection engines are more likely to produce carbon deposits than traditional EFI engines, and car owners need to use the most expensive in-cylinder direct injection engine special additives to solve the problem of carbon deposition.