Best of all, Keith has finally figured out these p

2022-07-26
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Keith: I finally understand the parameters of the engine

Keith: I finally understand these parameters of the engine

China Construction Machinery Information

engine is the heart of mechanical equipment, which is related to the service life and efficiency of construction machinery. In the construction machinery industry, most engines are diesel engines, which were invented by the German inventor Rudolf Diesel in 1892. In memory of the inventor, diesel is represented by his surname diesel, and diesel engines are also called diesel engines

diesel engine has the advantages of high power and good economic performance. Each working cycle also goes through four strokes: intake, compression, work and exhaust

heavy, noisy and black smoke make many people have a bad impression on diesel engines. After years of research and application of new technologies, the current situation of modern diesel engines is different from that in the past. Modern diesel engines generally adopt technologies such as electronically controlled injection, common rail, turbocharging and intercooling, and have made major breakthroughs in weight, noise and smoke, reaching the level of gasoline engines

the electronic control injection system of diesel engine consists of three parts: sensor, ECU (control unit) and actuator. Its task is to electronically control the fuel injection system to realize the real-time control of fuel injection quantity and timing with the operating conditions. The speed, temperature, pressure and other sensors are used to synchronously input the parameters detected in real time into the computer, and compare them with the parameter values stored in ECU. After processing and calculation, the actuator is controlled according to the optimal value to drive the fuel injection system, so as to achieve the best operating state of the diesel engine

cx210 sketch (engine position in excavator)

diesel engine is the core component of construction machinery products. When you learn about a construction machinery product, you should regularly observe the crack condition and crack width on the top and outer sides of the test piece. The first thing to look at is the parameters of the engine. However, for many newcomers, they can not really understand these parameters. Most of them are used to make numerical comparisons with products of the same class. In fact, for professional teachers, in addition to the superficial values, many things can be revealed from these parameters. Let's learn about engine parameters

1. Displacement

the space volume through which the piston moves from the top dead center to the bottom dead center of the cylinder is called the cylinder displacement. Since the engine usually has several cylinders, the engine displacement is the sum of all cylinder displacements

displacement can be understood as the vital capacity of the engine. It is one of the most important parameters of the engine, and it is directly related to many technical indicators of the engine. Generally speaking, within the respective categories of naturally aspirated and supercharged engines, the displacement is directly proportional to the power, as well as the fuel consumption and carbon emission

on the whole, the wide application of supercharging technology makes the small displacement supercharged engine achieve better power performance and less fuel consumption. In general, the displacement of an engine basically represents the positioning of a vehicle, and there will be certain differences in power (power, torque) and fuel consumption between engines with the same displacement due to technical reasons

2. Number of cylinders

without considering other factors, the more cylinders an engine has, the less vibration it will produce when running, and the more powerful the power output. This is because more cylinders participate in the work per unit time, resulting in the reduction of the work interval angle, which makes the engine work more coherent and natural

3, cylinder diameter × Stroke

cylinder diameter refers to the diameter of the cylinder, and stroke refers to the distance from the top dead center to the bottom dead center

simply look at the cylinder diameter and stroke without considering other factors. On the premise of constant exhaust volume, "small cylinder diameter × The design of "long stroke" will make the speed of peak torque lower, which is suitable for medium and low speed engines, and the power output is strong when starting and accelerating

conversely, "large bore × The engine with "short stroke" design is more suitable for high-speed engines because each stroke of the piston is short. Higher limit speed is its specialty. If you want to start and accelerate quickly, you can only increase the engine speed

4. Power

maximum power: the maximum output power is the ability of the engine to run at a moment of overload. Without considering the damage, it reaches the peak value in a short time. At this time, the tested engine is generally not equipped with transmission device, air filter, cooling fan and other accessories. As the engine speed increases, the engine power increases accordingly. After reaching a certain speed, the power will not increase, but will decrease. Therefore, the maximum power will be marked with the corresponding engine speed at the same time. However, in order to attract users, some manufacturers deliberately confuse the maximum output power with the rated output power, making people mistakenly believe that the product has a high output power. Therefore, when considering the power of diesel engine, we should not only look at the power figure, but also look at its marking method

net power: net power refers to the maximum effective power output of the engine power take-off shaft measured under normal operating conditions when the engine is equipped with all accessories under actual operating conditions. Because the engine power of any construction machinery vehicle is absolutely consumed when it is output to the working device through the filter and other accessories, the maximum available power measured after consumption is the net power we often say

therefore, we conclude that the relationship among maximum power, rated power and net power is: maximum power, rated power and net power. Generally speaking, the smaller the difference between rated power and net power is, the more reasonable the power structure design of this machine is

5. Speed

the engine speed is related to the number of work done per unit time or the effective power of the engine, that is, the effective power of the engine changes with the speed. The rotation speed is realized by fuel. The lower the rotation speed, the lower the fuel consumption

as the saying goes, it is easy to buy a car, but difficult to maintain it. Oil price has always been a thorn in the heart of car owners. In order to maintain the power output and transmission so as to avoid being affected by the experiment, the carburetor engine must keep the high throttle operation, and the continuous high throttle operation will bring about the continuous increase of fuel consumption. The engine equipped with electronic fuel injection system can accurately realize fuel injection under the premise of load electronic feedback, so as to control power output. According to the power distribution predicted by the operation, 1. The experimental machine must have three elements: a force adding device, a fixture, a power value display device and a record. Of course, the economy is not the same

6. Torque

torque refers to the average torque output from the crankshaft end when the engine is running. The torque is also directly related to the engine speed. The greater the torque, the greater the "force" of the engine output, the faster the change of the crankshaft speed, and the better the climbing ability and acceleration of the equipment. However, the torque varies with the change of the engine speed. If the speed is too high or too low, the torque is not the maximum. The maximum torque will be generated only in a certain speed range, which is the speed or speed range given when marking the maximum torque

as a popular example, when an athlete is running, the power that erupts at the moment of starting is torque, so the power can maintain the speed of the athlete to the finish line. For excavators, the greater the torque, the greater the digging force; For loaders, the greater the torque, the greater the lifting force; For bulldozers, the greater the torque, the stronger the thrust. Under the same displacement, the greater the torque of the diesel engine, the better the performance of the engine. When comparing the parameters of two engines, the amazing torque provided at the same speed is the amazing embodiment of power

engine is the heart of construction machinery and equipment. When discussing or purchasing construction machinery and equipment, we should first look at the parameter performance of the engine, so as to buy more valuable equipment. As the saying goes, a good horse deserves a good saddle. Nothing can stop Keith from yearning for more efficient power

Keith "thinking" C series is equipped with a new engine system, which combines high mobility and environmental performance with the higher durability of B series fuel injectors and pumps ☟ to make the engine more resistant to changes in the external environment ☟

in fact, through the relevant parameters of the engine, We can basically understand the technological advancement of an engine. With the continuous development of technology, the engine will have better power performance and less fuel consumption and emissions

in the era of rapid development of science and technology, case is always at the forefront of the surging tide. It is not afraid of change. It has always been working with change. It always starts from the needs of customers, uses the most reliable products, does not care about using better external component suppliers, and selects the best partners to go hand in hand with us

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