1. Multi-throat injection technology
What is Multi Throttle Body injection system multi-throat?
throat so-called multi-injection system, is simply an independent throttle technology. 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 .
In fact, multiple jets configured injection is not complicated, and it requires high precision to accurately adjust the internal engine parts to fit to achieve the desired results, the simple reason for this design is the intake system transformation with a high engine output power increase, 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.
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 is difficult to achieve the application, the shorter the intake manifold of the engine can be significantly improved high when the rotational speed of intake efficiency.
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 still was after displacementExhibit low rpm torque shortage 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 technology precision are undoubtedly increases the manufacturing costs. Application
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, the valve in the full throttle valve will be hidden in the space side 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.
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 1980sVery 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.
BMW by continuous development and improvement, so that the multiple jets advantage of direct injection of high to play the most, it is difficult to solve the lack of low torque characteristics are improved, a method by which BMW Double-VANOS (double cam axis variable valve timing system) optimization status of each intake and exhaust speed range, 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 engine response performance of the instantaneous acceleration of the torsion enhance performance of each speed range to a new level.
Multi-throat injection technology is also more widely in the application of turbine models, as we are familiar with ldquo; EGL Ares rdquo; Nissan Skyline GTR R34 that sets famous RB26DETT engine, plus twin turbochargers in holding under direct injection system uses a multi-throat, reached a power output of 280 hp (280 hp in order to meet the upper limit of 06 years ago provided the Japanese transport sector and ldquo; false rdquo; conservative data), the engine has been modified 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 use of multiple jets direct injection system of the engine main purpose is to increase the power output of the subsequent stage, in order to achieve the naturally aspirated engine like smooth and high speed output characteristics. RB26DETT is rare straight six production models turbocharger maximum speed, the actual operating characteristics are indeed high revolutions, 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 with a special design of the throttle plurality of air manifold box may multi-injection system throat achieve similar high to improve intake efficiency purposes, the full power of the engine of the press.
summed
Multi-jets direct injection technology can effectively improve the engine output, but multiple jets preferably direct injection systems require sophisticated and high manufacturing cost adjustment 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.