What is the difference between a car warning system and a self diagnosis and alarm system?

The difference is that the roles played by different roles are different, and the roles played are different.

Self-diagnosis refers to the car's electronic control unit, that is, the ECU real-time monitoring of itself and its peripheral equipment for faults and abnormalities, if so, the event is saved, and the corresponding environmental data such as mileage, number of occurrences, priority, etc. are also saved. These faults can be read by an external diagnostic device. I don't know what you mean by alarm, if you mean various instrument lights on or sound, this is also part of the self-diagnosis function.

Self-diagnostics belong to the logic of the software application layer.

Fault self-diagnosis system. It can be used to automatically check and monitor the working status of the transmission system and control system in the car. When the car breaks down, the fault indicator mounted on the dashboard flashes to warn the owner that there may be a problem with the car, and the fault** is displayed on the dashboard at the push of a button.

At the same time, this fault signal will be stored in the memory, even if the ignition is disconnected, troubleshooting, and the fault indicator is off, the fault signal will still be retained in the memory for the maintenance personnel to judge the fault of the car. <>

A car alarm is an alarm device that is installed on a car. If someone hits, hits, or moves the car, the sensor sends a signal to the controller indicating the intensity of the vibration. Depending on the intensity of the vibration, the controller will sound a warning or sound the alarm across the board.

This is used to deter thieves and prompt the owner to be notified. <>

The car warning system and the self-diagnosis and alarm system complement each other in no part of the car, and they are indispensable.

The car warning system may have an alien invasion.

Warning and call the police, and if you call the police, you will notify the police directly.

There is certainly a difference, but it won't be noticeable.

The warning system alerts the car when it receives a problem.

There is a certain difference, the alarm system is really wrong.

One is a warning system and the other is an alarm system.

Self-diagnosis may uncover some safety hazards.

Another difference, one is a warning and the other is an alarm.

I don't know what you mean by alarm, if you refer to various instrument lights on or sound or something, this is also part of the self-diagnosis function. Self-diagnostics belong to the logic of the software application layer.

Function. 1. Find faults.

If a signal outside of the normal range is fed into the microprocessor, the ECU will diagnose that the signal system is in an abnormal state. For example, the engine cooling water temperature signaling system specifies that the voltage of the sensor is normal and that an abnormality is diagnosed outside of this range.

If the microcomputer itself fails, it is monitored by a time-limited circuit equipped with an emergency monitoring timer; If there is a program abnormality, the resetting of the time-limited circuit that is carried out periodically stops working, so that the fault detection method of microcomputer resetting can be adopted.

2. Fault classification.

When the microcomputer is working normally, the abnormal condition of the input signal is detected by the diagnostic program, and then according to the detection results, it is divided into minor faults that do not cause obstacles, faults that cause functional degradation, and major faults. And the fault is classified according to importance, in advance in the program, when the microcomputer itself fails, the major fault classification is carried out through WDT.

3. Fault alarm.

Generally, the owner of the car is alerted by the flashing of the warning light set on the dashboard. In cars equipped with displays, there are also cases where the alarm content is displayed directly in text.

4. Fault storage.

When a fault is detected, the fault site is stored in the memory, and under normal circumstances, even if the ignition switch is in the disconnected position, the power supply of the microcomputer and the storage part remains on without causing the loss of stored contents. Only when the battery is disconnected or the fuse is unplugged, the fault in the memory** is automatically eliminated due to the power cut off from the microcomputer.

5. Troubleshooting.

If a failure occurs during the operation of the car, in order not to hinder the normal driving, it is regulated by the microcomputer, and the surrogate value in the pre-programmed program is used to calculate to maintain the basic driving performance, and then the corresponding maintenance is carried out by the owner or maintenance personnel after the stop.

The automotive self-diagnosis system includes a special vehicle detector, a vehicle-mounted diagnostic system, and a multi-functional vehicle-mounted external diagnostic system.

Generally, cars equipped with microprocessor control units have fault self-diagnosis systems. It can be used to automatically check and monitor the working status of each part of the transmission system and control system in the car.

When a sensor or circuit fails:

Its signal can no longer be used as the control parameter of the car, in order to maintain the operation of the car, the fault self-diagnosis module calls up the preset experience value from its program memory, as the emergency input parameter of the circuit, to ensure that the car can continue to work.

Hello There are functions such as fault discovery, fault classification, fault alarm, fault storage, fault handling, etc. When the car fails, the signal will be stored in the memory, even if the ignition is disconnected, troubleshooting, and the fault indicator is off, the fault signal will still be retained in the memory for the maintenance personnel to judge where the car is faulty. After troubleshooting, the fault code will be cleared after 30 seconds of disconnecting the ECU from power.

The fault component is saved in the form of a fault code, which is convenient for the diagnosticator to read out and quickly find out, and the fault warning light is lit to remind the driver that the EFI system is faulty.

Diagnosing the car's power system, body system, chassis system, signal system, air intake system, etc., Kuchebao can help you complete this job very well, real-time feedback to your mobile phone receiver, you don't need to know the fault ** to know what is wrong with your car.

Generally, there are two, instrument self-diagnosis and air conditioning self-diagnosis. The rest will have to be decoded. Of course, some cars can also be short-circuited diagnostic plugs, use the flashing frequency of the fault lamp to manually read the code, and then check the fault code book, but some codes can not be read manually.

The electronic anti-theft alarm system of the car refers to the electronic identification of the car to play the role of anti-theft.

Electronic anti-theft alarm system is to add electronic identification to the car lock, unlock the key with the need to enter more than a dozen passwords of the car anti-theft mode, it generally has remote control technology, is with the development of electronic technology and rapid development of a way of anti-theft.

After the owner locks the door remotely, the alarm will enter the alert state, at this time, if someone pries the door or opens the door with a key, it will immediately trigger the alarm of the anti-theft device to deter thieves from stealing, the door is not closed before driving, and the warning light will flash continuously for several seconds. If the door is not properly closed, the lights will keep flashing and the horn will sound until the door is closed.

When the remote control emits the correct signal, the door lock opens or closes automatically. The remote control and electronic key of the electronic remote control anti-theft device have corresponding passwords.

Car anti-theft alarm is a multi-functional product, which can not only be used for anti-theft alarm, but also can have the functions of remote control starting the trunk, remote opening and closing of the door, remote control opening and closing of the window, remote control starting the engine, remote control locking of the engine, etc.

When the car is alarmed (such as illegal start, door opening vibration, system damage), the system immediately dials the owner's preset alarm** (mobile phone, landline). And sound and light warning, lock the circuit oil circuit, so that the car can not start when the alarm is not solved. In the event of a robbery or car robbery, if the owner cannot get out, he can press the hidden button, and the system will immediately dial the emergency help preset by the owner**, and the police can counter-control the hijacked vehicle for parking, listening, shouting, etc.

If the owner can get out of the vehicle after being robbed, he can use any ** to enter the system with a password to counter-control the hijacked vehicle parking, listening, shouting, etc.

Electronic anti-theft locks are one of the most widely used anti-theft locks, which are divided into one-way and two-way. The main functions of the one-way electronic anti-theft system are: opening and closing the door of the car, vibrating or illegally opening the door alarm, etc., and there are also some brands of products that have added some functions according to the needs of customers

Use the electronic remote control to complete the engine start, stall, etc. The two-way visual electronic anti-theft system is much more advanced than the one-way one-way, can thoroughly let the owner know the actual situation of the car, when the car has abnormal alarm, the LCD display on the remote control will show the situation encountered by the car at the same time, but the disadvantage is that the effective range is only 100-200 meters.