1. Definitions
Multi-injection system throat) larynx so-called multi injection system, a throttle valve is simply an independent technique. In the conventional engine, combustion of the air when the work required by the introduced intake air inlet, through the air filter after filtration by a throttle to the intake manifold, and fuel are mixed to form a mixed gas, and finally into the combustion cylinder. Multi-injection throat of the air after the air filter becomes an independent throttle valve per cylinder, the air flow sensor is provided separately on each of the throttle valve, the independent monitoring of each cylinder intake event. Objective generally also intake manifold of an internal polishing treatment, the lower the intake air resistance, this time with the supply system requires an increased intake air amount, the fuel pressure and increase the precision of fuel injection amount, to achieve improved power output
engine . In fact, construction of multi-injection throat is not complicated, but requires precise adjustment and high-precision internal engine parts to match in order to achieve the desired results, for the simple reason that this is in line with the design of the intake system of the engine to increase the output of high transition power, the engine generally opposing internal parts of the engine in order to meet the need for extra reinforcement and impact heat caused by the rotational speed higher.
to improve the engine power is the major automobile manufacturers compete for links, direct injection multi-throat (Multi Throttle Body, or called independent throttle system) technology has been become an effective way to improve engine performance, not specializing in high-performance engines of less well-known manufacturers have been using this technology, but unfortunately the original configuration of this design engines are mostly high-end sports cars and racing, most only in a handful of heavily modified cars can be seen, and with a little rare Mystery.
throat picture is different multiple injection system in the form of three kinds of inlet air filter, designed with a left collector tank can reduce the loss of low-twist, the rightmost directly abandoned filter layer, complete disregard cleaning low torque output of the engine speed, used for cars, belonging to the intermediate compromise manner.
Benefits
of the plurality of throttle obvious, increasing the overall area of the throttle valve, the intake air amount of the cylinder is improved. Each individual cylinder throttle can also reduce the weight of the throttle body to improve the response performance, multiple jets also allows direct injection, etc. grow manifold should be difficult to achieveWith shorter intake manifold can significantly improve the intake efficiency of the engine high speed.
increasing the area of the inlet valve and the shorter intake manifold used, though they have a better intake efficiency at high speeds, but at low speed leads to a small intake pressure, gas flow rate of decline, the loss of low-rpm torque, want to improve the situation in theory, the easiest way is to increase engine displacement, but actually doing so can only be considered a temporary solution, to increase the displacement still showing a lack of low-rpm torque the situation, then we need more ways to improve with the loss of low torque.
On the other hand, since the multiple jets per cylinder direct injection system using a separate throttle design, for the throttle control and tune demanding, improper tuning, ranging from the engine is not smooth, affect the power output, weight the imbalance of the respective cylinder intake air amount, the engine abnormal jitter, mixture formation and fuel supply system will be incorrectly adjusted abnormal combustion of the engine, resulting in wear. The cylinder and the throttle body clean itself protection also need extra attention. Complex design and high process accuracy will increase the manufacturing to have 
present.
2, multi throat direct injection system
Multi-throat injection system was first being used in racing engines, F1 racing is the most representative models. When using naturally aspirated engine F1 racing performance of the most brilliant 3-liter 900 may output horsepower or power of more than 300 hp, speed close to twenty thousand revolutions, almost reached the limit of four-stroke engines, to achieve this amazing data, in addition to an engine with high-precision components and computer programs, follow the intake system is quite critical. The compressed fresh air introduction scoop collector tank, each cylinder using an independent throttle, throttle body is also different from the general butterfly valve of the intake valve, the use of side-opening design can be fully opened, and the support removed throttle valve shaft, in the full throttle valve side of the valve body will be hidden in the space where the throttle channel becomes a member without any hindrance, further reducing the intake resistance, the need to ensure a high intake air amount in the engine when there is no loss of
.
applied in the civilian models said, have seen the Initial D is no stranger to friends, Takumi driving AE86 later replaced with a TRD racing modified 4A-GE engine, 1.6 liters row amount, the maximum speed reached a staggering 11,000 rpm, maximum power of 240 horsepower, even if such values are called turbo engine is absolutely out of line performance. Which production models equipped 4A-GE engine with double overhead camshaft 5-valve per cylinder design, with the help of technology dual VVT (variable valve timing), the injection system with multiple jets, the engine 7400 per minute the power-liter 100 horsepower do the turn. In Japan, high-performance engines in the 1980s was a very eye-catching. This engine used on the Toyota AE Series lightweight sports car perform well. However, due to the low small displacement, direct injection and multi-throat caused by twisting bad phenomenon, making use of the engine subject to many restrictions.
Toyota 4A-GE produced the multi-injection engine jets, under the original state or power can provide over a hundred horsepower small-displacement classic models, but because of the lack of low torque and cost issues, practical application is the restrictions.
and one of the true multi-throat use of direct injection technology superb brand is very familiar BMW. Used on production models as early as in 1978, 3.5 liters in-line 6-cylinder engine with multi-jets on the direct injection technology horsepower output reached 277 horsepower, it is not easy in such data for the year. In the BMW M series camp later, almost no use of direct injection technology for more than a throat away. The first generation to win the DTM (German Touring Car Masters) of the E30 M3 (S14B23 engine), and later the E36 M3 (S50B32 engine), for six consecutive years was named the best engine E46 M3 (S54B32 engine), the new V8 form the E90 (S65B40 engine) technology and the use of F1 V10 engine E60 M5 (S85B50 engine), etc., all use multiple jets direct injection technology.
The figure is the best engine ever won six consecutive years winning S54B32 on the use of multi-engine jets direct injection systems, like BMW models are very familiar friends, classic inline six-cylinder design, multi-throat straight spray system and DouWith the help of ble-VANOS, 3.2-liter squeeze out the strong power of 343 horsepower, has become a classic BMW.
E60 M5 used S85B50,5.0 liter V10, with a large number of technical F1
throat with multi injection system, the 507 peak horsepower horsepower
through large collector tank to adjust insufficient low torque problems, improve low speed state of the intake pressure
while reducing the intake air temperature to improve the intake air mass
BMW improved by continuous research and development, so that multi-jets Direct injection of the advantages of high to play the most, it is difficult to solve the lack of low torque characteristics are improved, a method by which DOHC BMW double-VANOS intake and exhaust variable valve system optimization status of each speed region timing ( , in particular multi-injection system well-developed throat large collector tank to reduce the influence of heat with the intake air mass and density to further increase the performance of the engine in response to the instantaneous acceleration of the torsion enhance the performance of each new rotation region to height.
multi-throat injection technology in the application of turbine model is also more widely, as we are familiar with “EGL Ares” Nissan skyline GTR R34 that famous Taiwan The RB26DETT engine used in the blessing twin turbochargers multi-throat injection system, power output reached 280 horsepower (280 horsepower order to comply with the provisions of the upper limit of 06 years ago in Japan and the transport sector “false” conservative data) the modified engine after more than 1000 hp examples abound. coming back to the intake system, the intake air amount is generally turbine models can be adjusted by the value of the turbocharger, the main purpose is to use a multi-injection system laryngeal increasing the engine power output in subsequent stage, in order to achieve smooth like naturally aspirated engine rotational speed and a high output characteristic is rare .RB26DETT straight six production models turbocharger maximum speed, the actual operating characteristics are indeed high turn, it is naturally vaporized.
such as a super sports car Lamborghini and Ferrari, uses a similar technique multiple injection jets, although not designed individually for each cylinder a throttle valve, but a plurality of sections with a special valve manifold box may be designed to achieve a similar multi-injection system laryngealPurpose of improving high transfer efficiency of the intake air, the full engine power press. 
such as a super sports car Lamborghini and Ferrari, uses a similar technique of multiple injection jets
3 summarizes
Multi-jets can effectively improve the direct injection engine output power, but the ideal of multi-throat injection systems require sophisticated calibration and high manufacturing costs to support, currently only used in racing and more high-end sports car. Has been through continuous development and improvement, multi-throat direct injection system has been completely out shortcomings of poor performance and low fuel consumption twist, I believe in the future development of automobile technology, multi-throat injection system will gradually be more models of the use.