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Tale Of The Seven

2024

Video: Tale Of The Seven

Video: Tale Of The Seven
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Tale Of The Seven
Tale Of The Seven
Anonim

EQUIPMENT

/GAZA STRIP

TALE OF THE "SEVEN"

THERE WERE BEEN NPAF SAGA AND OJSC PJSC INCAR. AND THEIR Daughter Was BORN - SEVENTH ACCOUNT

TEXT / MAXIM NET

WE HAVE GAS IN RUSSIA

Even the dartsman from the last desk knows that there are a great many gases in nature. However, far from all are suitable for automotive motors. Today, dual-fuel engines for the most part use liquefied petroleum gas (a propane-butane mixture), a by-product of the distillation of oil. Naturally, its quantity is limited by the volumes of extraction and processing of “black gold”. But there is enough natural gas methane on the planet, just manage to produce and sell. And this is not his only advantage. During combustion, less harmful substances, for example, hydrocarbons, are released - about a quarter, and most of the emissions are completely harmless water vapor.

Finally, the most important argument in favor of methane is an attractive price: about three rubles per cubic meter. Propane and butane are no longer competitors - this couple is twice as expensive. So designers and developers took up more complex fuel systems that run on natural gas. One of them is the Moscow-Perm novelty SAGA-7.

SEVEN OR FIRST?

Just don’t think that SAGA-7 is a modernized version of the installation already familiar to many with serial number 6 (ЗР, 1999, No. 8). They have only parents - the Moscow scientific and production company SAGA and the Perm Aviation Association "Inkar", the sisters are similar to each other, but only at first glance. The main structural differences are associated with different gas pressures in the systems. In SAGA-7, compressed methane is stored at a pressure of about 20 MPa (200 atmospheres), in SAGA-6, liquefied propane-butane requires "yoke" almost an order of magnitude less.

The cylinder is perhaps the most expensive part. To reduce the weight and increase the strength of the walls, alloyed metals or aluminum reinforced with fiberglass are used. Each liter of internal volume costs about 4-5 dollars. It is not difficult to estimate the price of a 50-liter barrel for the Lada. Trucks like the Gazelle are content with steel cylinders with thick walls - they are cheaper, but God knows how much they weigh. Those who wind several hundred kilometers every day will get two cylinders - it’s hard, but the fuel gauge does not need to be constantly monitored.

At the outlet of the cylinder a valve is installed - a tee with a faucet. It distributes gas along the “refueling device-cylinder-system” route, and in case of fire it quickly relieves pressure and frees the tank from explosive fuel.

From the cylinder, the gas pipeline goes to the high pressure valve under the hood. At the command of the electronic unit, it shuts off (when required) the gas supply to the gearbox. Work at first glance is simple, but do not forget how many megapascals in the fuel line! In addition, a sensor is installed in the valve body that monitors the gas pressure in the cylinder and transmits signals to the fuel level indicator through the electronic unit.

The evaporator reducer is outwardly similar to the one in SAGA-6, but the apparent similarity is all the original stuffing. There is no valve for condensate drain on the body - natural gas, unlike propane-butane, “does not sweat” at work. The valve disappeared, but a brass high pressure reducer appeared. It lowers the pressure to 1 MPa, and “relaxed” methane fills the gearbox-heater. Further, depending on the design of the car, it is dosed through a mixer into the space in front of the throttle and with air enters the combustion chamber.

The gas valve is unified with the previous installation. His task also remained the same - to cut off the supply of gas while working on gas.

SAFETY SAGA

The high pressure in the cylinders and fuel lines imposes a serious responsibility on the manufacturer, which is reflected in the design of SAGA-7. The cylinder valve, refueling device, solenoid valve and high pressure reducer are equipped with double gaskets and fittings. When the main gasket is depressurized, the fuel enters the drainage cavity - the second seal does not allow it to enter the cabin or the engine compartment. Further, through flexible hoses, the gas goes beyond the vehicle. Special sensors detect leaks and command the electronic device. The driver hears a beep, while the indicator lights indicate the place of the malfunction: luggage compartment or engine compartment. Not “every fireman” unit independently shuts off the gas solenoid valve after the engine stops. And so that methane residues do not flow out into the engine compartment, the unloading device with vacuum control is provided in the gearbox.

Russian manufacturers make any rubber, except one that would work properly in gas environments. Therefore, the membranes in SAGA-7 are imported. Specialists predict trouble-free operation for five years. And then - how lucky. In any case, the replacement will not take much time and money. By the way, instead of some rubber seals, soft brass rings are installed. They do not crack, do not harden, remain airtight throughout the entire service life.

And if you arrived at the gas station, paid for the required amount of gas, connected the hose, and then … forgot about it? You won’t be able to leave the station, wagging the docked tail - the engine will not work while the car is “tied” to the column.

Natural gas itself plays a major role in the struggle for security. Unlike propane-butane, methane is 1.6 times lighter than air, and therefore does not accumulate in rooms and garage pits, quickly volatilizes and does not form an explosive mixture. In addition, natural gas is less flammable. To “bang”, it will need 2–2.5 times more.

TALE MAKE FABULOUS

Installing SAGA-7 on a domestic passenger car will cost a private trader about 15 thousand rubles. The contents of a 50-liter cylinder with compressed methane is equivalent to 12 liters of “ninety-second” gasoline. Consequently, fuel savings at current prices for every 100 km will be about 40 rubles. So, the idea will pay off by about the fortieth thousand.

Great, isn't it? I can’t even believe it - just like in a fairy tale. But since methane is so good and cheap, why in the country are so few cars working on it? To answer, remember how often gas filling compressor stations (CNG filling stations) have come across your way - gas stations with compressed natural gas? Even with small runs, dangling several times a week to a distant column is uncomfortable and disadvantageous. You can’t fill the canister with gas, and putting a large bottle on a passenger car is expensive, and the size of the trunk is limited.

Without state assistance, compressed natural gas cars will remain fabulous characters. It would be nice for officials to revise the tax system that stifles manufacturers and inflates the cost of gas equipment and services; at the same time agitate the owners, giving them concessions and benefits. The number of "methane" cars will increase - a network of refueling complexes will begin to develop not only in large cities, but also along major highways. Then the modern tale of methane will become a reality.

Two-stage gearbox-heater with a high-pressure gearbox.

Gas bottle valve (left) and refueling device.

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