Auto OBD principle and future development trend

 OBD is the abbreviation of English On-Board Diagnostic. This system monitors the operating status of the engine and the working status of the exhaust gas aftertreatment system at any time. Once it finds a situation that may cause the emission to exceed the standard, it will immediately issue a warning. When the engine system fails, the Malfunction Indicator Lamp or check engine warning lamp lights up, and the OBD system will store the fault information in the memory. Relevant information can be read in the form of fault codes through standard diagnostic equipment and diagnostic interfaces. According to the prompt of the fault code, the maintenance personnel can quickly and accurately determine the nature and location of the fault.

Features of OBD:

1. The shape of the diagnostic seat for the unified vehicle model is 16PIN.

2. With numerical analysis data transmission function (DATA LINK CONNECTOR, DLC for short).

3. Unify the same fault codes and meanings of all vehicles.

4. With the function of driving recorder.

5. With the function of re-displaying and remembering the fault code.

6. With the function of clearing fault codes directly by the instrument.

What is OBD？

     OBD (On-Board Diagnostic System) is an "on-board diagnostic system". A diagnostic system that can warn the driver when the system or related components of the control system fail. The application of OBD system originates from Euro III emission standards. The OBD device monitors multiple systems and components, including engines, catalytic converters, particulate traps, oxygen sensors, emission control systems, fuel systems, GER, etc.

      OBD is connected to an electronic control unit (ECU) through various emission-related component information. The ECU has the function of detecting and analyzing emission-related faults. When an emission failure occurs, the ECU records the failure information and related codes, and issues a warning through the failure lamp to inform the driver. ECU guarantees the access and processing of fault information through standard data interface.

     OBD technology originated in the United States in the 1980s. The initial OBD technology used appropriate technical methods to alert drivers to failures or malfunctions. The European Union and Japan introduced OBD technology after 2000. After 2004, OBD technology in developed automotive countries entered the third stage.

    There are certain differences between Europe and the United States in terms of OBD testing items and limits. The purpose of American OBD monitoring is to detect failures before becoming high-emission vehicles; the purpose of European OBD monitoring is to find high-emission vehicles. The OBD technology imported by China will be equivalent to the relevant regulations of the European OBD system after three stages.

      OBD is connected to an electronic control unit (ECU) through various emission-related component information. The ECU has the function of detecting and analyzing emission-related faults. Because of this, today's OBD is not only a function of detecting and analyzing emissions-related faults, but also extending more and more powerful functions, heralding the birth of a new industry.

OBD application

Application 1:

OBD application functions: fault diagnosis system, fuel statistics system, tire pressure monitoring system, safety warning system, acceleration test system, green driving report function, maintenance system, vehicle anti-theft system, value-added system.

Application 2:

★Application areas: 4S shops, auto repair stations, auto maintenance, auto insurance, transportation and other industries

OBD expandable functions:

1. Obtain the remaining fuel information of the vehicle

2. Tire pressure monitoring system

3. Car collision warning and monitoring system

4. The technologies that have been developed and verified are:

5. Vehicle anti-theft function

1), remote control car lock switch

2), remote authentication, remote start

3), remote control to open the electric tail box

4), remote control oil cut

5), remote control lift window glass

6), remote control central lock

7), remote control of direction lights and horns

8), read the brake system and provide gear information

9), vehicle body vibration alarm and reversing signal acquisition

10) Provide steering angle position information

Future development

With the in-depth application of automotive OBD functions, a large number of operators, software developers, and automotive electronics manufacturers have all set their sights on OBD applications. They want to obtain vehicle information through OBD and develop more powerful new functional products through OBD. Use new functions to enhance value-added services, thereby increasing the added value of products and grasping the end customer base.

Judging from the current development trend of OBD, many companies use the OBD function to establish projects in the field of Internet of Vehicles. At present, OBD has become a standard and necessary function of automobiles, which means that OBD will be used as a standard configuration item in in-vehicle products.