What are the conditions that must be met for the electronically controlled engine to work properly 5

There is oil and electricity [If there is a problem with the car, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

Hello, there is oil, there is fire, there is a computer signal! There is no mechanical failure of the engine [There is a problem with the car, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

The biggest difference between an electronically controlled engine and a carburetor engine is the fuel supply system. The fuel supply system of the electronically controlled engine has eliminated the carburetor, but a number of electronic automatic control devices have been added. These include many sensors, actuators, and ECUs.

Electronically controlled engines have to do not only what carburetors do, but also what carburetors can't do. For example, the specific concentration of air-fuel in a combustible mixture can be controlled within the required range. The oil circuit and circuit of the carburetor engine are very clearly divided and do not affect each other much.

The electronically controlled engine fuel supply system increases the electronic control part, which makes the oil circuit and circuit interconnected, which not only affects the work of the engine fuel system, but also affects the normal operation of the engine. Due to the increase in electronic control devices for electronically controlled engines, this makes the entire structure of the engine, including the electronic control system, more complex.

Fast. Navigation.

Structural composition. How it works.

Parameters to be measured. Merit.

Basic idea. In the initial stage, the function of the system is realized by replacing the mechanical control technology with electronic technology, and its function is expanded, so that the performance is greatly improved; After the development to a certain extent, electronic technology can promote the essential change of the system principle, so that the limitations can be broken through, so that the engine performance can be greatly improved.

Electronically controlled engine.

Structural composition. Electronic control unit.

The electronic control unit (ECU) is the heart of the engine's electronic control system. It completes the collection of various parameters of the engine, the control of fuel injection volume and fuel injection timing, and determines the function of the entire electronic control system.

Sensor. Sensors transmit information about engine conditions and environment to the ECU in real time and realistically through various signals.

In other words, what the ECU learns is just an engine made up of many signals. Therefore, the accuracy, reproducibility and immediacy of sensor information directly determine the quality of control.

Actuators. The various control functions to be completed by the electronic control system are realized by various actuators.

In the control process, the actuator converts the control signal from the ECU into a certain mechanical motion or electrical movement, thereby causing the change of engine operating parameters and completing the control function.

How it works. The engine speed and load are used as the basic signals reflecting the actual working conditions of the engine, and the basic fuel injection amount and fuel injection timing are determined with reference to the fuel injection amount and fuel injection timing spectrum corresponding to each working condition of the engine obtained by the test, and then various compensation is made according to various factors (such as water temperature, oil temperature, atmospheric pressure, etc.), so as to obtain the best fuel injection amount and fuel injection timing or ignition timing, and then control the output through the actuator.

1) Consultation: Ask the user about the situation of the failure, the conditions for the occurrence of the fault, the fault phenomenon and whether it has been repaired.

2) Judge and check whether there is a mechanical fault, if it is a mechanical fault, proceed to step (3), otherwise go to step (5).

3) Repair mechanical failures.

4) Verify whether the fault phenomenon disappears after mechanical troubleshooting, and if it disappears, end the inspection. Otherwise, the electronically controlled gasoline injection system is faulty, continue to check.

5) Read the fault, and verify that the fault** exists, if it exists, go to step (7), if it does not, continue to check.

6) Use the fault symptom simulation method to verify the fault and repair the detected fault, go to step (9).

7) Determine the location of the fault according to the fault table, if the fault is displayed normally, and the fault still exists, the fault needs to be diagnosed according to the fault indication list or repair experience provided by the maintenance data.

8) Troubleshoot the faults indicated by the fault ** or the faults diagnosed one by one.

9) Verify whether all faults are eliminated, if not, go to step (1), if all are eliminated, end the inspection.

1. Fault consultation.

It is inevitable that there will be failures in the use of electronically controlled engines, and we often discuss maintenance methods around the fault diagnosis process in practice, and the diagnosis is the basis, which is to understand the whole process of fault occurrence and development through the inquiry of the driver, so as to obtain relevant information and lay a good foundation for further diagnosis.

2. Symptom confirmation.

Do not rush after the consultation, and you need to confirm the symptoms. There are many factors that distort the information to a certain extent. Some drivers provide us with inaccurate information, some because the driver's description is not accurate enough, and some because the driver himself does not know the car condition in detail, which requires us to confirm the symptoms by allowing the fault to reappear.

3. Visual inspection.

Not all fault detection requires the use of diagnostic instruments, and sometimes, the cause of the fault or important clues can be quickly found through intuitive inspection, so it is necessary to flexibly use a variety of means in maintenance to ensure that the diagnosis is carried out in accordance with the principle from simple to complex, so as to improve maintenance efficiency.

Fourth, decoding diagnosis.

It is a very important step in the process of diagnosing electronically controlled engines to read the fault code by using the electronically controlled engine self-diagnosis system, and the fault code is of great significance to the determination of the maintenance direction and the detection process.

There are two ways to read fault codes: manual code reading and methods that use instrumental diagnosis.

5. Data reading.

It is not enough to use a diagnostic instrument to diagnose faults in actual maintenance. In many cases, it is necessary to use some data flow to find clues to troubleshooting.

Confirm the existence of the fault - access the diagnostic tool, read the fault code - analyze the scope of the fault - according to the fault phenomenon, start from simple to complex or from the most likely fault - eliminate the fault - complete the re-inspection.

Meet the conditions that the electronically controlled engine can work normally: the fuel supply system of the fuel tank is divided into oil, the battery voltage is normal, the fuse and switching circuit system are normal, and the suction and exhaust systems are normal.

How the electronically controlled engine works:

The basic signal with the engine speed and load reflects the actual working condition of the engine, and the basic fuel injection volume and injection timing pulse spectrum are determined with reference to the test of the engine working conditions.

Then according to various factors, such as oil temperature, water temperature, atmospheric pressure, etc.), various compensation, so as to obtain the best amount of fuel injection and fuel injection ignition timing, and then control the output through the actuator.

There is oil in the fuel tank, the gasoline pump is working normally, the engine control unit is in good condition, the wiring is normal, the signal of each sensor is normal, the actuator signal is normal, the spark plug is in good condition, the ignition timing is correct, and the electronically controlled engine can work normally.

Water Temperature Sensor Air Flow Meter Oil Circuit Circuit Ignition Time The engine itself is not faulty.

The circuit is normal, the tank is oily, and the engine is normal.

Starting from the simplest: 1 two major mechanisms: crankshaft connecting rod mechanism (including crankshaft, connecting rod, piston, etc.), valve mechanism (camshaft, valve, etc.).

2. Five systems: lubrication system (oil lubrication system), cooling system (water circulation system), fuel system (gasoline or diesel, natural gas, hydrogen and other fuels), starting system (starting circuit, ignition switch and motor, etc.), ignition system (electronic control system, including ECU, sensors, actuators, etc.).

It's basically made up of these things, and a little jotting it down will help you in the future.

"Components" mainly refer to all the internal components in the automotive electronic control engine excluding the connecting wires, and component failure is the failure of the system operation caused by damage to the internal components.

In the actual operation process, the component failure has a high incidence, and the main reason for the component failure is that the temperature of the engine of the automobile will inevitably continue to rise in the long-term operation state, and then it will be in a high-temperature environment, and it will be affected by the high-temperature environment, and some internal components, such as spark plugs, fire coils, unit control and closed coils, will appear in different degrees of aging, which has a negative impact on its function and performance, and then leads to the appearance of component aging faults.

Through the research and analysis of relevant data, the main reason for the high temperature of the electronically controlled engine in the actual operation process is that the engine surface is untidy and dusty during the operation of the car, and it is also possible that some impurities have entered the interior of the car. If it is not cleaned regularly, it will lead to an increase in engine pressure and pressure, which is likely to cause high voltage inside the system in the state of high-speed operation, which will have a greater impact on the performance of internal components, and then lead to the decline of the function of internal control components, which poses a serious threat to the safety of passengers and drivers.

If you want to ensure that the car's electronically controlled engine is running reliably, it is important to maintain an effective connection between the various devices. If the equipment has a connection line failure, or the connection line is loose, damaged and other bad conditions, then the system will be suspended in the process of information transmission and instruction transmission, resulting in the corresponding bad fault, which has a serious impact on the operation of the automotive electronic control generator.

In addition to this, a faulty line can also lead to the failure of the electronic control unit, making it unable to perform its functions effectively, posing a serious threat to the safety of drivers and passengers. In addition, the short-circuit fault of the circuit is also a common line fault, and the main cause of the short-circuit is temperature, humidity, etc.

The main reason for the failure of the components is that the temperature of the engine of the car will continue to rise in the long-term operation state, and then it will be in a high-temperature environment, and it will be affected by the high-temperature environment, and some internal components, such as spark plugs, live coils, unit control and closed coils, will have different degrees of aging, which has a negative impact on its function and performance, and then leads to the appearance of component aging faults.

At present, these problems usually occur in the electronic control engine of automobiles: there are many line connection connectors of the EFI system with poor contact of the wiring plug-in, and with the increase of the mileage, it may lead to the occurrence of connection disconnection, the normal transmission of signals such as lexicography; Air intake pipe leakage, air intake pipe sealing is not tight, air leakage will make air enter the cylinder measurement weightless; Failure of the hydraulic regulator; Poor working of the fuel pump, etc.

Aging parts, faulty wiring, and problematic operation, the car will easily stall, and the car will not be able to start normally.

It will cause the flameout, there is no way to start normally, there is no way to provide kinetic energy, there will be some problems with the line, and there will be some problems with the operation.

The electronic control system works normally, the fuel supply system works normally, the gas distribution is timed, and the ignition system works normally.