HS code-driven margin analysis

Contents of this articleList:

• 1,HS code-driven margin analysis Related cases of variable cycle jet engine
• 2, The case of abnormal noise failure of Corolla engine?
• 3, Volkswagen engine failure case analysis
• 4. Some cases of electronically controlled engine maintenance
• 5,Engine failure failure code maintenance case
• 6, Volkswagen Maiteng acceleration weak, engine compartment abnormal noise maintenance Case

Related Cases of Variable Cycle Jet Engine

1. When the heart of the black bird, the J58 engine roars, few people can not be moved by it. J58 is also a variable cycle engine, but it is not the same path as GE. J58 is a variable cycle of conversion between turbojet and compressor-assisted stamping engines.

2. As early as the time when the variable-circulation engine F120 was just installed for test flight, it could achieve an intermediate thrust of 12 tons under the condition that the maximum thrust was only 14 tons! Its proportion easily exceeds 80%, which is quite amazing. In general, it is difficult for turbofan engines to reach 65% of the limit thrust.

3. Although the variable cycle engine experiment was only tested on the ground, this concept was proposed as early as the 1970s, and in the U.S. military SR-71 The Blackbird reconnaissance aircraft was put into use. Due to the limited technology at that time, the model of the cyclable engine equipped by the Blackbird was J58, which was developed and manufactured by HP.

4. In fact, this ideal engine is the variable-cycle jet engine being developed by the world's aviation power, which is also the core technology of the sixth-generation fighter. This variable-cycle engine has three air culverts and can freely change the size and caliber, so it is suitable for different working states.

5. Research and development of a 5x sonic shock engine for the 7th generation. The 5th generation stealth machine generally adopts a large thrust turbofan engine with a thrust-to-weight ratio of 10.

6. This is the Pratt Whitney J-58-1 turbojet subcombustion stamping combined cycle engine used by the SR-71 reconnaissance aircraft.This is the Pratt Whitney F-135-PW-100 turbofan engine used by the F-35 multi-purpose fighter.

The case of abnormal noise failure of Corolla engine?

1. Lack of normal maintenance. Due to the long-term neglect of engine maintenance, it will lead to abnormal engine noise.For example, the blockage of the air filter, the aging of the spark plug, the lack of oil, etc. will affect the operation of the engine.

2. After the engine starts successfully, the clicking sound may be due to the start of the overspeed clutch of the starter, and there is a failure inside the overspeed clutch. It can be solved by repairing it in the store.

3. Whether it is related to specific actions, such as adding and downshifting gears, starting, rapid acceleration, sudden deceleration, turning, etc., are all effective means to judge abnormal sounds. Among them, changing speed and direction are particularly important for determining rear axle failures. If the abnormal sound of the transmission is obvious, it is still recommended to send it to a professional repair shop to check the faulty parts and then replace it.

4. As the throttle sound increases, it is the engine-related sound. Don't be careless. My car, which has been squeaking for more than a year, is it a manual transmission?If it may be that the connector is ringing here, so is mine. I hope it can help you.

5. It may be that one of the 4 cylinders is not working and the exhaust problem. This situation will occur if the exhaust is not smooth. It would be better to turn off the air conditioner. This will also happen if you add too much oil.

6. Does the questioner want to ask "What's wrong with the abnormal sound of the front cover of the Toyota Corolla hanging automatic transmission and the idle gear"? One of the bearings of the Toyota Corolla engine failed, and the corrosion of the bearing inside the engine caused the car to make an abnormal sound. The front wheel brake cylinder of Toyota Corolla does not return to position, resulting in wear of parts and abnormal noise.

Volkswagen engine failure case analysis

Volkswagen engine failure case 1: A Volkswagen Touareg with a mileage of about 33,000km and equipped with a CDE engine.The engine cylinder block of the car was replaced due to the accident, but all the accessories on the cylinder head were not disassembled, and the hot car made a strange sound. According to users, there was no such phenomenon before the accident.

Engine: 4 liters. Driving distance: 57,000 kilometers. Fault phenomenon: the engine fault light is on, the start-up time is too long, and the operating comfort is poor. Use the fault diagnosis and exclusion computer diagnostic instrument to read the fault code (Figure 4-5-1).

Fault of the electronic control system Due to the continuous development of the technology of the electronic control system, this is also one of the frequent failures of the Volkswagen EA211 engine. It is mainly due to the aging of the automobile circuit, which causes a short circuit or poor contact, resulting in the failure of the electronic control system, thus affecting the normal operation of the vehicle.

Symptom Description: Step on the accelerator or brake while drivingWhen driving, there are always some strange sounds in a certain part of the car body. The sound is not loud, and it does not affect normal driving, but it always makes people a little worried about where there is a malfunction.

The reason why the Volkswagen polo shows that the engine fault light is on: the throttle valve is too dirty, resulting in too much mixed gas; the engine accumulates too much carbon, resulting in unqualified exhaust emissions; the engine oxygen sensor fails. A 2006 Volkswagen POLO sedan with a mileage of more than 220,000 km.

The diagram of Volkswagen's 60 common faults is as follows: black smoke from the exhaust pipe Cause analysis: It shows that the mixture is too thick and the combustion is incomplete. The main reasons are that the car engine is overloaded, the cylinder pressure is insufficient, the engine temperature is too low, the carburetor is improperly adjusted, the air filter is blocked, individual cylinders do not work and the ignition is too late, etc.

Some cases of electronically controlled engine maintenance

1. The biggest difference between electronically controlled engines and carburetor engines is in the fuel supply system. The fuel supply system of the electronically controlled engine has eliminated the carburetor, but many electronic automatic control devices have been added. These include many sensors, executive components and ECUs.

2. Use VAS6150E to detect the vehicle, and the fault code U300100 is reported in the 000 engine electronic control system. There is a fault in the operation of the control unit (10100111 active static.

3. The main reasons are the car engine overload, insufficient cylinder pressure, low engine temperature, improper adjustment of the carburetor, blockage of air filter, individual cylinders not working and late ignition, etc.

4. Plug-in connection failure. There are many plug-ins in the circuit of the electronic control system, which often cause the plug-in to age due to long use, or due to multiple disassembly and installation, the plug-in connector is loose and poor contact, resulting in unstable operation of the engine (sometimes good and sometimes bad).

Engine failure to start failure-free code maintenance case

Figure 1 Lingpai electronic shift switch detection and analysis maintenance personnel on-site rescue, engine start, dashboard failure-free indicator light on. When the electronic gear shift switch is operated as r, n, d, the dashboard shows "Unable to shift. Please try again later", the vehicle always keeps the p gear.

First, remove the utility box, unplug the keyless start control module, check the wiring harness and plug, plug it back in after there is no problem, and use the diagnostic instrument to detect that the fault still exists.

After pressing the ignition switch, you can hear the sound of the starter rotating, and the normal operation of the starter can be judged according to the sound. The measured battery voltage is above 15V, and it is in good condition. So far, the possibility of starter failure and failure caused by insufficient battery power has disappeared.

Basic control parameters and correct readings under different working conditions can only be accurately judged after careful analysis. The troubleshooting steps from p t/m1r $ f4t/H7 p t/m1r $ f4t/H7 p t/ trouble-free code are shown in the following table.

When the car engine is not working normally and the self-diagnostic system has no fault code output, it is especially necessary to rely on the operator's inspection and judgment to determine the nature of the fault and the part of the fault.

Volkswagen Maiteng acceleration is weak, engine compartment abnormal noise maintenance case

A Volkswagen Maiteng sedan factory in 2008 is equipped with an 8t turbocharged engine. The car cannot speed up when stepping on the accelerator pedal, and the maximum speed is only 80km/h.

Step 1: If there is abnormal noise in the engine compartment of the car, it means that the belt is usually loose or of poor quality, so check the engine belt first. If there are too many belts in the car, we can't tell which belt is wrong. We can start the car first and then pour some water on the belt.

There are many ways to solve the problem of Maiteng's acceleration powerlessness. First of all, overhaul the engine and drive system in time to ensure that they are in good working condition.You can ask a professional technician to repair or replace key parts. Secondly, pay attention to the driving style and avoid excessive use of accelerator and brakes.

Most of the cold start jitter is caused by poor combustion of fuel. There is too much glue moisture in the fuel tank, and too much carbon accumulation inside the engine. The cold start is not brought to the combustion chamber, and then mixed in the fuel tank is beaten into the combustion chamber. The shaking caused by poor combustion.