Year1
- 接近角：
- 21
- 离去角：
- 17
1. Failure analysis of engine deceleration and automatic stalling
The fundamental reason for releasing the accelerator pedal when the engine is running or automatically stalling when the vehicle is moving is that when the engine changes from non-idling to idling, it is difficult to idle. stable, so turn off the flame immediately. Specific reasons include accelerator pedal failure, crankshaft position sensor and camshaft sensor signals are out of sync, fuel oil pressure failure, control unit signal error, incorrect injection timing, etc. Focus on checking the numerical changes from non-idling to idling.
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2. Insufficient engine power or poor acceleration
The phenomenon of insufficient engine power is that the engine is basically normal when running without load, but when running with load, the acceleration is slow and weak when going uphill. The accelerator pedal is pressed to the bottom. I still feel that there is insufficient power, the speed does not increase, and the maximum speed cannot be reached. The phenomenon of poor engine acceleration is that the engine speed cannot rise immediately after pressing the accelerator pedal, there is hysteresis, or the engine has slight fluctuations during acceleration.
The reasons for engine power failure and poor acceleration are: the fuel system oil pressure is too high or too low; the injector has poor fuel injection; the sensor signal is incorrect; the fuel injection volume is too small; the injection timing is incorrect; the cylinder compression pressure is low; the exhaust pipe Blockage etc.
Three engines cannot start and are difficult to start
There are many factors that cause electronically controlled diesel engine starting failures, which generally manifest as inability to start without initial combustion and difficulty in starting. The inspection and troubleshooting methods are as follows
Check whether there is a fault code. If so, check according to the content of the fault code.
Check whether the engine can rotate when starting.
① When starting, the starter does not rotate, and it should be checked according to the cause of the starting system failure. First check the battery storage condition and pole connection and contact conditions. If normal, check the starting line fuse and ignition switch. If the starter can rotate but the engine cannot rotate when starting, it is a fault in the meshing part of the starter and the engine.
② When starting, the engine speed is normal, but the engine does not start, the fuel injection system and the air intake system should be checked separately.
For engines using electronically controlled fuel injection, there is no need to press the accelerator pedal when starting. If you fully depress the accelerator pedal when starting or repeatedly depress the accelerator pedal to increase fuel supply, the engine speed will increase instantaneously, causing the engine to increase fuel consumption.
Disengage the accelerator pedal harness. If the engine can enter idling speed at this time, it means that the fault is the accelerator pedal.
Visual inspection Check whether there is air leakage in the air intake pipe.
Oil line inspection Check the connection status of the oil pipe, the phenomenon of air intake and the quality of the fuel.
Wiring Harness Check the wiring harness connection status to see if there is any looseness or loose connection.
Inspection of the sensor: Check whether the sensor fails, the circuit is loose or broken, and the synchronization signal between the crankshaft and the camshaft.
Check whether there is a control signal from the fuel injector. If there is no control signal, check the fuse circuit and. If there is a control signal, check whether the spray condition of the injector is normal.
Heating Technology Editor Oil tank trucks play a very important role in the oil and gas storage and transportation process. In oil and gas storage and transportation, tank trucks are mostly used for oil storage and transportation. When oil is needed, the oil is output from the tank. In the process of oil output, we inevitably encounter such a problem. The oil becomes viscous due to low temperature, which reduces the fluidity of the oil, resulting in the oil being unable to be smoothly output from the oil tank. When encountering such a problem Problem, how to solve it? According to the [Oil Tank Heating Technology Promotion Center], the new oil tank local rapid heating technology solves this problem very well.
Oil tank heating oil tank local rapid heater
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Working principle
Extend the vortex hot film heat exchanger into the bottom of the oil tank along the radial direction of the tank, and the heat medium steam On the tube side, the oil flows between the tubes on the shell side, and the oil suction port of the shell is directly connected to the medium in the tank.
A temperature control valve is installed at the steam inlet of the heat exchanger. The temperature of the oil outlet is detected by a temperature sensor probe to control the amount of steam entering the heat exchanger, thereby ensuring a constant oil temperature.
The heat exchanger uses high-efficiency heat exchange elements vortex hot film tubes to maintain a reasonable flow of oil between the tubes. The thermal efficiency is twice that of ordinary heat exchangers. Its enhanced heat transfer mechanism is designed when the oil fluid flows on the internal and external surfaces. It forms a turbulent flow, producing strong oscillations and scouring effects. The direction of the flow is constantly changing. The high-temperature oil fluid close to the surface of the pipe wall is constantly replaced. The insulation layer becomes thinner and even destroyed. The heat transfer on the metal surface is accelerated, and the fluid microscopic vortices Strengthen the heat diffusion inside the oil fluid. The fluid close to the pipe wall surface will not be overheated at local high temperatures, so the oil can be properly and fully heated without the possibility of coking and decomposition. It transfers heat well without causing great resistance.
Heating characteristics
Fast heating speed, high heat transfer efficiency, and not easy to scale.
It can quantitatively heat oil products, heating as much as needed.
There will be no local high-temperature carbonization of the oil, ensuring the quality of the oil and the heat transfer efficiency of the heater.
The oil outlet in the oil tank has the highest temperature, ensuring the fluidity of the poured oil.
It avoids repeated heating of the oil in the tank, ensures the color of the oil and reduces the cost of oil treatment.
Long service life, corrosion resistance, high temperature resistance, high pressure resistance and anti-fouling function greatly improve the overall performance of the heat exchanger.
The advanced process structure design ensures smooth outflow of oil and better pumping effect from the bottom of the tank.
It can realize automatic control and control the steam feed amount according to the inlet and outlet temperature of the oil and the oil pouring flow rate.
The structure is compact, easy to install and maintain, and the safety of the tank will not be affected by the installation of the heater. Compared with the profiled tube heat exchanger, the external dimensions of the vortex hot film heat exchanger are only about half of the profiled tube heat exchanger under the same heat exchange area.
Compared with the electric heating method, it is safer, gentler in heating, and has less impact on oil quality.
Comparison between new heating technology and traditional tube-type oil tank heating
Heating method Heat medium oil output Heating temperature Heating time Condensate water temperature Steam consumption
Saturated steam of tube-type heat exchanger / ℃℃ hourly minutes ℃ tons
Oil tank local rapid heater saturated steam/ ℃℃ hourly minutes ℃ tons
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Note data comes from Sinopec lubricant actual measurement comparison table
Safety Prevent editors from being charged with electricity. During loading and unloading operations, the human body must come into contact with the working objects of the tanker truck to generate friction, which will easily generate static electricity and may form electrostatic discharge. If flammable and explosive oil vapor happens to be encountered at this time, it will occur. Explosion accident. Operators must wear anti-static overalls and anti-static shoes during operation, the purpose of which is to ground the human body. In addition, the shoes worn should be thin nylon socks or other conductive socks. It is strictly forbidden to paste insulating film on the anti-static soles and should be inspected regularly.
Static grounding cannot be ignored. From the perspective of a fuel truck, the main areas where static electricity is generated are pump filters and pipes. The amount of static electricity generated by the tanker filling system is much higher than that of above-ground pipes. For static electricity hazards, the following measures must be taken
① Connect the ground wire before filling the oil, and frequently check its integrity and whether the ground resistance meets the anti-static standards.
② When filling oil, the crane pipe must be extended to the bottom of the oil tank. The distance between the pipe mouth and the bottom of the tank should be kept at left and right, and the initial filling speed should be strictly controlled within 1/2 until the oil outlet is submerged, and then the flow rate can be gradually increased. However, the maximum flow rate must not be exceeded to prevent electrostatic accidents caused by splashing
③After the oil is installed, the grounding must be disconnected after the oil has stabilized. Because after the oil is installed, the oil level potential will be maintained for several minutes due to the flow of oil in the tank.
④Don’t let your guard down just because you have good grounding. Static electricity grounding can only conduct static electricity on conductors, metals, human bodies, conductive liquids, etc. that are closely connected to it. However, it is powerless or difficult to conduct static electricity on isolated conductors and non-conductive oils, rubber, resin, glass, etc. that are not connected to it in a short time. In addition to this, while grounding static electricity, operators should also strictly follow the operating procedures and pay attention to hidden dangers that may arise at any time. At the same time, they must master the emergency methods and rescue measures to correctly handle various emergencies
Filling the conversion oil The accidents caused should also be taken seriously. This kind of accident mainly occurs when a tank filled with gasoline is used to hold diesel. The flash point of gasoline is lower than that of diesel. If diesel is injected into a tank containing gasoline vapor, the gasoline vapor will be reduced due to absorption by the poured diesel. Small pressure, then air is sucked into the tank, and a flammable mixture is formed somewhere between the liquid surface and the air suction point. An explosion may occur when static electricity accumulates and discharges. Therefore, when it is necessary to change the oil filling, the gasoline in the tank must be cleared first, and the operation must be carried out in strict accordance with the operating procedures.
Use equipment that meets technical specifications and safety requirements. The automatic control, remote control measuring instruments, valves and other equipment of the oiling station must be regularly inspected and calibrated, and relevant management systems must be formulated. In particular, the material of the oiling equipment cannot be underestimated. At the same time, you cannot make do with static grounding devices. You must strictly follow the specifications, install them carefully, and inspect them regularly. For those that commonly use clamps and magnetic connectors for grounding, they should not be clamped or adsorbed on random parts of the tanker truck, even on the painted surface. This is extremely detrimental to anti-static and is a major hidden danger. Many users are looking for temporary benefits when buying cars, but they don't know that you get what you pay for. Inferior equipment can easily cause accidents. You should pay more attention to dangerous goods vehicles such as oil tank trucks.
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