What is multi-throat direct injection?

More and more people buy cars, and the basic knowledge of cars continues to be highly valued. Some technical terms are gradually added to our daily life, but there are still some words or auto parts that are said by technical professional maintenance personnel, and everyone still doesn't understand them. I'm not sure how I was fooled, so let's discuss some vehicle-related spare parts together. What is today's multi-throat direct injection?

Improving the output power of the engine is an important stage for every automobile manufacturer. Multi-throttle direct injection (or single throttle system) technology has always been an effective way to improve engine performance. Many famous manufacturers specializing in excellent engines have applied this technology, but most of the modules originally equipped with this design scheme belong to sports cars and high-end sports cars, which can only be seen on a few medium and heavy modified cars at most, which is scarce and brings a little freshness.

What is a multi-throat multi-throat direct injection system? To put it bluntly, the multi-throat direct injection system is also a separate throttling technology. On the traditional engine, the gas needed for power ignition is introduced into the air inlet from the air inlet, filtered by the air filter element, and then enters the intake branch pipe from the throttle valve, which is mixed with gasoline and diesel to generate a mixed gas, and finally enters the cylinder for ignition. Multi-throat direct injection becomes a separate throttle valve for each cylinder after the gas passes through the air filter element, and each throttle valve is independently equipped with a gas air flowmeter to independently supervise the intake attitude of each cylinder. Generally, we will continue to polish the intake branch pipe to make the intake friction lower. At this time, the oil systems provided must cooperate with each other to improve the air intake, the working pressure of gasoline and diesel and the accurate fuel injection, so as to achieve the purpose of improving the output power. In fact, the structure of multi-throat direct injection is not complicated, but it is only necessary to accurately adjust the cooperation of its high-precision engine parts to achieve the expected practical effect. There is a simple reason. The intake system of this design is to cooperate with each other to develop a high-conversion engine to improve power, and the relativity of engine parts must be strengthened to adapt to the heat energy and impact caused by higher rotation speed. The photo shows three different intake filter modes of multi-throat direct injection system. The left side contains a gas collection box to reduce the damage of low torque, and the rightmost one immediately abandons the filter layer, completely ignoring the low-speed specific torque _ output and engine cleanliness, and is mostly used for sports cars, while the right middle one is the most suitable method. The benefits of several throttles are very obvious, which enlarge the overall total area of throttles and improve the air intake of cylinders. The independent throttle of each cylinder can also reduce the net weight of the throttle oil circuit board and improve the response characteristics. Multi-throat direct injection technology can also make the intake branch pipe with the same length that is difficult to achieve, and the shorter intake branch pipe can obviously improve the intake efficiency at high engine speed. The intake branch pipe with improved range and application of intake gate valve has good intake efficiency at high speed, but at low speed ratio, the intake working pressure is not large, the swirl speed decreases and the low-speed torque is damaged. In theory, a very simple way to improve this situation is to increase the engine displacement, but in fact, this can only be carved out from the root. After increasing the displacement, the low-speed torque will still be poor, and more and more is needed at this time. On the other hand, due to the application of independent throttle design scheme in each cylinder, the multi-throat direct injection system requires extremely high throttle control and unreasonable adjustment. At least, the engine is not smooth, endangering the driving force. At the same time, the intake of each cylinder is unbalanced, and the engine finds abnormal vibration. Unreasonable adjustment of the mixed gas produced by the provided oil system will also cause abnormal ignition of the engine, leading to damage. And the cleaning and maintenance of the cylinder and throttle oil circuit board itself must also be paid great attention to. Complex formula and high technical precision undoubtedly increase the manufacturing cost.

Application of multi-throat direct injection system The multi-throat direct injection system was first applied to sports car engines, and F 1 sports car is a very symbolic automobile system. In the application of F 1 sports car with intake engine, the displacement of 3 liters can be above 900 HP, the fuel consumption exceeds 300 HP, and the speed ratio is close to 20,000 rpm, which basically reaches the limit of four-stroke engine. In order to obtain such shocking data information, in addition to the cooperation of high-precision engine parts and their computer systems, the tracking of intake system is also very important. The compressed fresh air is introduced into the bucket gas collection box, and each cylinder uses an integrated throttle valve. The oil circuit board of the throttle valve is also different from the ordinary colorful butterfly valve. The side opening design scheme which can be completely opened is selected, and the transmission shaft of the supporting point throttle valve is cancelled. When the throttle valve is fully open and closed, it will be hidden in the area near the oil circuit board, making the throttle valve a hole blocked by all components, further reducing the intake friction resistance and ensuring that the engine will not be damaged during extremely high intake. When it comes to the application in civilian vehicles, I firmly believe that friends who read the prefix D will be familiar with it. Later, the AE86 safely driven by Tuohai was replaced by a 4A-GE sports car engine with TRD _ _, the displacement 1.6 liter, the maximum speed ratio reached a shocking 1 1, 000 rpm, and the high power reached 240 horsepower, and so on. The 4A-GE engine of its mass-produced car series adopts the design scheme of double-diameter engine camshaft with 5 cylinders per cylinder, and with the help of double VVT technology (variable valve engine timing) and multi-throat direct injection system, the fuel consumption of the engine is guaranteed to be 100 horsepower at 7400 rpm. In the 1980s, the main performance of Japanese excellent engines was very noticeable. This engine is used in the gentle fitness and sports car system of Toyota AE series products. However, due to the small displacement and low torque difference caused by multi-throat direct injection system, the application of the engine is limited. The 4A- universal multi-throat direct injection engine produced by Toyota Company can reach a small displacement of more than 100 horsepower in the original situation, but its specific application is limited due to the lack of low torque and cost. One of the brands that really apply multi-throat direct injection technology is BMW 5 Series, which we know very well. As early as 1978, the 3.5-liter in-line 6-cylinder engine used in production cars, with the help of multi-throat direct injection technology, made its high horsepower reach 277 horsepower. Such statistics were not easy at that time. After that, the multi-throat direct injection technology was basically not used in the influence of M series products of BMW Five Series. The first generation of E30M3(S 14B23 engine) won DTM (German Touring Car Championship), followed by E36M3(S50B32 engine), E46M3(S54B32 engine), which has been called the best engine for six years, and E90(S65B40 engine) with brand-new V8 upgrade and V 10 technology application. The S54B32 engine, which won the best engine award in six years, adopts a multi-throat direct injection system, which is well known to friends who love BMW models. With the help of multi-throat direct injection system and double VANOS, the displacement of 3.2 liters squeezed out the strong driving force of 343 horsepower, which became a classic of BMW 5 Series. The E60M5 adopts S85B50, 5.0L V 10 engine, and a large number of F 1 multi-throat direct injection systems are adopted, with the maximum horsepower exceeding 507 horsepower. It is difficult for large and medium-sized gas collectors to adjust low torque, so the intake working pressure is increased at low speed ratio, and the intake degree is reduced, thus improving the intake quality. The high-speed advantage of multi-throat direct injection technology has been fully exerted, but the low-torque poverty that is difficult to solve has also been improved. According to BMW's five-series Double-VANOS (dual-engine camshaft variable valve engine timing system), the intake and exhaust pipes in each speed ratio area were upgraded, especially the large and medium-sized gas collection box specially developed for multi-throat direct injection system, which reduced the harm of heat to intake quality and density, further improved the engine response characteristics and instantly accelerated the torque in each speed ratio area. Multi-throat direct injection technology is also very common in the application of turbocharged vehicles. For example, NissanSkylineGTRR34, a well-known RB26DETT engine, is driven by double turbocharging and adopts a multi-throat direct injection system, achieving an energy output of 280 horsepower (traditional data information is "falsely reported" in order to better meet the 280 horsepower limit required by Japanese transportation units before 2006). Back to the air intake system, the air intake of the turbocharged car can be adjusted according to the turbocharger value. The most important function of applying multi-throat direct injection system is to improve the driving force of the engine in the later stage, so as to better realize the stable and high-speed rotation speed characteristics of the self-priming engine. RB26DETT is also an uncommon straight six turbocharged mass production model, with the largest transfer speed ratio, which is indeed very high and naturally gasified in specific work. Ferrari, Lamborghini and other super sports cars also use similar multi-throat direct injection technology. Although each cylinder has an independent design scheme, several throttles cooperate with each other, and the unique gas collection box can achieve the purpose similar to the multi-throat direct injection system, improve the intake efficiency and fully extract the driving force of the engine. Super sports cars such as Ferrari and Lamborghini also adopt similar multi-throat direct injection technology, which can reasonably improve the engine power. However, the idealized multi-throat direct injection system can only be applied after delicate calibration and expensive manufacturing cost. At present, it is only used in sports cars and more advanced fashion sports cars. After continuous development and improvement, the multi-throat direct injection system has completely overcome the defects of poor performance, low torque and low fuel consumption. It is firmly believed that under the trend of sustainable development of new energy technology, multi-throat direct injection system will be gradually applied by more and more cars.

How about it? Is it clear at a glance after reading the contents above? You should all know the function and basic principle of some vehicle parts. If you modify a car, you should fully consider whether you have this requirement. Either it is really a huge consumption, or even if it is modified, the fuel consumption has expanded, which is really troublesome. Therefore, it is necessary to know more about relevant professional knowledge when modifying cars.

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