车载自动诊断系统obd技术解析

车载自动诊断系统OBD技术解析:

.OBD:

OBD is English On-Board Diagnostics abbreviation, Chinese translation for "automatic on-board diagnosis system". This system will be from the engine operating conditions monitor whether the automobile tail gas exceed the standard, once exceed the standard, will be immediately issued a warning. When the system failure, failure (MIL) check engine (Check Engine) warning lights, at the same time the powertrain control module (PCM) fault information will be stored in memory, through certain procedures fault codes can be read from the PCM. According to the indication of fault codes, repair personnel can determine the nature and location of fault quickly and accurately.

From twentieth Century since 80, the United States and Japan, Europe and other major automobile manufacturing enterprises began in the production of EFI vehicle equipped with OBD, the initial OBD is not self checking function. OBD- is more advanced than the OBD II in twentieth Century 90 time metaphase, American society of Automotive Engineers (SAE)

developed a set of standard specification, requirement each automobile manufacturing enterprises to provide diagnosis model according to unified OBD- II standards, in twentieth Century 90 years late, the car entered the North American market in accordance with the new standard setting OBD. OBD- II and all on board before self diagnostic system is different with the strict emissions targeted, the matter of fact is the performance of vehicle emissions monitoring. When the vehicle emissions of carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NOx) or fuel evaporation amount of pollution exceeds the set standard, the lamp will light fault alarm. Although the OBD- II is very effective for vehicle emissions monitoring, but the driver acceptance warning all by "consciousness". Therefore, OBD- is more advanced than the OBD- II III produced.

OBD- III main purpose is to make the vehicle detection, maintenance and management as a whole, in order to meet the requirements of environmental protection. OBD- system can respectively into the engine, gearbox, ABS ECU system (computer) to read the fault code and other related data, and the use of small vehicle

communication system, such as GPS navigation system or wireless communication management department will automatically notice vehicle identity code, the fault code and location information, management department according to the the vehicle emission problems of grades on its issued a directive, including where to repair advice, to solve the time, also be to beyond the time limit offenders vehicles issued a ban for instruction. Therefore, the OBD- system can not only on the vehicle emission issues warning to the driver, but also carry out punishment for offenders.

Reportedly, some models of the introduction of domestic joint venture automobile factory in recent years also have production and sales in Europe, which itself is equipped with OBD and reached the European III and even the European IV standard, domestic often minus OBD on or off, on the one hand is to save cost, but also caused trouble in order to avoid the oil quality is not up to the situation because the OBD alarm. Beijing in the implementation of Euro III standard, will require cars to increase OBD equipment. Allegedly Euro III standard in Beijing implementation of the first year manufacturers