Ask a tough question about diesel.

The ECU of the electronically controlled diesel engine mainly calculates the amount of fuel injection based on the signals of throttle position sensor, intake air temperature sensor and intake pressure sensor.

The sensors and functions used in electronically controlled diesel engines are as follows:

1. The crankshaft sensor accurately calculates the position of the crankshaft, which is used to calculate the fuel injection time, fuel injection volume and rotation speed.

2. When the camshaft sensor and crankshaft sensor fail, it is used to go home with a limp (temporary operation).

3. The inlet air temperature sensor measures the inlet air temperature, corrects the fuel injection volume and fuel injection timing, overheat protection, and the booster pressure sensor monitors the inlet air pressure, calculates the intake air volume together with the inlet air temperature, and integrates it with the inlet air temperature.

4. The cooling water temperature sensor measures the cooling water temperature, which is used for cold start, target idle speed calculation, etc., and is also used to correct the fuel injection advance angle, overheating protection, etc.

5. The common rail pressure sensor measures the fuel pressure in the common rail pipe to ensure the stability of oil pressure control.

6. The throttle position sensor sends the driver's intention to the controller ECU.

7. The vehicle speed sensor provides the vehicle speed signal to the ECU for vehicle drive control, which is provided by the vehicle.

8. The atmospheric pressure sensor is used to correct the fuel injection control parameters at different altitudes, which is integrated in the ECU.

Electronically controlled diesel engine, we call common rail or high-pressure common rail, this engine is controlled by 8 sensors and circuit boards, the high-pressure oil pump is just the function of oil delivery, there is a solenoid valve tube oil on the fuel injector, the electronically controlled combustion method is different from the general engine, the general engine is a ignition burst, the common rail is 2 or more times, that is, when the piston is about to reach the injection point, the fuel injector sprays a small amount in advance, buffers it, and then arrives after the normal injection This design is to extend the life of the engine and save fuel.

As for the accelerator time pedal, it is transmitted to the circuit board through the sensor, and the computer host is one at a time, and then analyzed and processed, but you will find that the speed of the electronically controlled diesel engine is slower than that of the average diesel engine, yes, this is the reflection program is slow.

The intake is controlled by the opening of the throttle valve and a computer signal is returned to determine the fuel injection.

1.What you said was originally incorrect, the vibration of the gasoline engine is smaller than that of the diesel engine, the gasoline engine is ignited by a spark plug, the implosion pressure in the cylinder is not as high as the diesel engine, the diesel engine compression ignition, the implosion pressure in the cylinder is high, and the steam engine is now gone, except for the train, 2Pickup trucks are generally 4-cylinder engines, tractors are single-cylinder, just imagine, 4-cylinder continuous work, in a cycle, one cylinder after another cylinder to do work, single-cylinder is to rotate two weeks to do work, it is definitely not continuous, each time the work is vibrated once, but the frequency is reduced when it accelerates.

Audi, BMW, Bugatti, and other high-end sedans are V-shaped multi-cylinder (generally 8-cylinder) engines, which are used to reduce vibration.

Each engine is designed to be targeted, and it is impossible to design an engine with superior performance without targeting.

The application of engines in various fields has different designs, as far as you said about vehicles and construction machinery (tractors are also considered engineering vehicles) with engines, I will make a simple explanation!

Vehicles, especially used in civilian buses (and high-end cars with diesel engines) engines, we first require the comfort of the whole vehicle, then the first thing to consider is that the noise and vibration of the engine should be reduced, the first thing to reduce noise and vibration is to consider reducing the cylinder displacement piston stroke and compression ratio, after reducing the above relevant parameters, we have to take into account the output power of the engine, then only increase the speed of the engine, so our high-end car engines are small single-cylinder displacement, High-speed engine with short stroke (diesel engine for high-end cars abroad can reach a speed of more than 6000r min).

Compared with the engine for construction machinery, it requires high power and high torque, and the comfort of the whole vehicle is not so important!

Well, yes. No, it's because the engine of the car is in it, and it's because the car is a lot lighter than the tractor.

The main difference in construction between diesel and gasoline engines is that diesel engines do not have spark plugs on the top of their cylinders.

The speed of the diesel engine is low, the related parts are not easy to age, and the wear and tear of the parts is less than that of the gasoline engine, so the life is relatively long, there is no ignition system, and there are few auxiliary electrical appliances, so the failure rate of the diesel engine is much lower than that of the gasoline engine. The compression-ignition diesel engine has a higher energy conversion than the ignited gasoline engine, and the energy consumption is 45%-60% of the gasoline engine, plus the diesel ** is lower than the gasoline**, so it is fuel-efficient and cheap.

1. Classification of diesel engines: 1. From the perspective of cooling mode, it is divided into air cooling, water cooling and oil cooling. 2. From the perspective of working mode, it is divided into two-stroke four-stroke rotary engine.

3. From the perspective of combustion mode, it is divided into compression ignition type and pre-ignition type. 4. From the perspective of the body structure, it is divided into star-shaped, V-column, in-line and opposite. 5. From the perspective of fuel supply, there are high-pressure common rail, single pump (such as PT system), Lucas's VE system, Bosch A-shaped pump system, Yama, and a single-piston distribution pump (electronic control and mechanical fuel injection systems are based on these types) 5. There are two kinds of clockwise and counterclockwise in the rotation, and the premise is that the direction of the engine fan shall prevail, and it should be noted that some engines in Japan are based on the direction of the crankshaft as the observation point.

Second, the structure of the diesel engine: nothing more than the starting system, fuel system, cooling system, lubrication system, ignition system, crank connecting rod mechanism, valve mechanism, timing mechanism ** sub-engine has not been in contact with the sub-engine does not know whether it is in this range).

3. The common terms of diesel engine are power, horsepower, torque, and speed, and the displacement calculation formula is the piston stroke multiplied by the cylinder cross-sectional area and then multiplied by the number of cylinders.

Fourth, the working process of four-stroke diesel engine is suction, compression, burst, and exhaust. BMW once made a screen protector for an engine, which is very intuitive and quite detailed.

Shangchai D6114 won't be an imitation of Cummins, right?

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The water and oil channels on the cylinder head and the body are not connected, so they will not mix, and if the head gasket is flushed, it is very likely to mix.

The large circulation of cooling water means that the engine generates a large amount of heat when it is running at high load, and all the cooling water is cooled by the radiator, that is, the thermostat is completely closed.

Small circulation means that after the thermostat is turned on, part of the cooling water does not pass through the radiator for heat dissipation, but directly enters the body and mixes with the cooling water after cooling through the radiator.

One of the most critical devices is the "thermostat", which automatically adjusts the amount of water in large and small cycles according to the water temperature, so that the engine water temperature is constant at the optimal temperature (usually 80-85 degrees).