The exhaust system, the car body is a contradiction of the intersection point, on the one hand, it is very low-key, most hidden in the lower body of people do not pay attention, on the other hand, sports car, vehicle performance is on a vigorous and attractive exhaust noise. On the one hand, it is responsible for the environmental protection of emission; on the other hand, it has a great effect on the dynamic and light weight of vehicles. In the exhaust pipe layout, is also a great difference, some hide and not let people see, some are designed to be very exaggerated very cool. What are the causes of this difference in style? What are some of the little-known secrets about the exhaust pipe? Today, Mr. Kan and everyone came to know this guy who kept himself "hidden".
The basic components of an exhaust system
Because the exhaust gas is not directly discharged, but through the exhaust system components can be filtered out. An automobile exhaust system is a system that collects and discharges exhaust gases, usually consisting of exhaust manifolds, exhaust pipes, three yuan catalytic converters, exhaust temperature sensors, car mufflers, and exhaust tailpipes. Among them, three yuan catalytic converters and automotive mufflers, because of emissions, environmental protection and noise control is the most important, is the core components.
Three yuan a catalytic converter is installed in the vehicle exhaust system is the most important carrier of the purification device, component is a porous ceramic material, installed in a special exhaust pipe, covered with a layer of platinum, rhodium, palladium and other precious metals and rare earth coating. The principle of operation is to exhaust the exhaust gas of carbon monoxide, CO, hydrocarbons, HC and nitrogen oxides, NOx and other harmful gases through oxidation and reduction into harmless carbon dioxide CO2, water, H2O and nitrogen N2. The exhaust gas is filtered by catalytic converters before moving to the next step.
Oxygen sensor is the key component of three yuan catalytic converter for purifying tail gas. Because once the fuel ratio deviates from the theoretical air-fuel ratio of mixed gas air purification capacity of three yuan, CO, HC and NOx on the catalyst will drastically decrease, while the detection of oxygen sensor in the exhaust oxygen concentration, and a feedback signal to the ECU, then the ECU control of injection volume change, fuel ratio control in the theory of value in order to mixed gas air, to control vehicle exhaust emissions, reduce automobile pollution to the environment.
After three yuan catalytic converters filter the exhaust gas, the next step comes to the muffler. The muffler, as its name suggests, is a device for removing noise. Its working principle is to use two different length of the pipeline, the half length is equal to the difference between the exhaust sound wavelength, the two wave in the superposition of the interference offset weakened sound intensity, the sound is reduced, so as to play a sound effect, or a car will be very noisy, causing noise pollution affect passers-by.
We all know that in general the engine of the car in front of the exhaust pipe on the back end, mainly for the following reasons: first, a plurality of catalytic converter and the muffler are often set in the exhaust system, only through the exhaust system of thin layers of filtration, can achieve exhaust environmental emissions and eliminating the noise requirements. Secondly, most of the former driving type engine position in the front, but also to the carriage of passengers have spacious and comfortable space, so in the body very limited space, only the exhaust system is placed on the chassis, exhausted by an exhaust pipe to the rear of the car, to maximize the use of space.
But this is only for the design of family cars, some car engine is arranged on the back end, with a long strip of exhaust pipe is not appropriate, so the car exhaust pipe design winding, can achieve both rear engine exhaust, but also from the back row to put.
Of course, special models will also have different designs, such as Mercedes Benz, G and SLR, exhaust pipes are placed on the side. The reason is simply that the exhaust is prematurely released from the side to prevent the exhaust system from passing through the rear suspension and damaging the rear suspension structure.
There is an extreme example of American blockbuster "Transformers" in the Optimus Prime (Peter Bildt 389), on the way to take the exhaust emission, the reason is very simple, because the truck exhaust quantity and high heat, only to emissions to achieve environmental protection and safety effect.
Back to everyone familiar with the ordinary sedan, perhaps there will be friends found, different car exhaust pipe on the left, and some in the right, what's the law? In fact, but also because the chassis arrangement caused, in China, the car's fuel tank design on the right, in order to seize the position of the exhaust pipe to the tank, placed on the left; while Japanese cars instead of tank design in the same side with the driver left, the exhaust pipe is placed on the right side as far as possible, but also simple, one is space as far as possible on the staggered, one is to avoid heat transfer, one is to balance the weight.
Some manufacturers to design the exhaust pipe into the hidden towards the ground, so that the whole design can keep the car rear bumper, but also can avoid the exhaust scald pedestrians, but also avoid the water when wading. Of course, the disadvantage is that people do not feel the existence of the exhaust pipe, as if something is missing......
The most common design method has the advantage of lower cost, simple chassis layout, but poor symmetry, and it doesn't look good enough for small displacement household cars.
Common in a slightly larger displacement of the car, chassis layout is simple, symmetry is poor. However, due to the use of double row mode, the possibility of exhaust is a possibility, that is, a channel with muffler, and the other without, so as to change the driving experience of the vehicle.
Slightly more careful cars will be used bilaterally
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