A self-adaptive control method for direct injection gasoline engine mixture

Abstract

The invention relates to a self-adaptive mixed gas control method for a gasoline direct injection engine. According to the self-adaptive mixed gas control method for the gasoline direct injection engine, a self-adaptive mixed gas control function is additionally achieved for online self-adaptive adjustment through special self-adaptive mixed gas control software according to the air-fuel ratio deviation characteristic and different working conditions; the fuel injection quantity calculated by an ECU is corrected by using the self-adaptive value as the parameter, so that the emission performance of a vehicle is improved; and self-adaptive values obtained through learning under different working conditions are stored in an EEPROM register of the ECU. Compared with the prior art, by adoption of the self-adaptive mixed gas control method for the gasoline direct injection engine, the situation that the air-fuel ratio of a system becomes poor due to errors accumulated in a long time can be avoided to a certain extent, the closed-loop control quantity for the air-fuel ratio is learned and corrected, and the situation that the air-fuel ratio is poor due to component abrasion and characteristic deviation of sensors and actuators after the vehicle travels for a long time is avoided to a certain extent; and the situation that emission becomes poor due to changes of oil added into the vehicle can also be avoided to a certain extent through the self-adaptive mixed gas control function, and finally, a good air-fuel ratio closed-coop effect can be achieved rapidly when the vehicle starts again after being stopped.

Description

technical field [0001] The invention belongs to the field of automobile electronic control. The invention relates to an adaptive control method for a direct-injection gasoline engine mixer, which is suitable for direct-injection gasoline engines and vehicles equipped with components such as an oxygen sensor, an electronically controlled fuel injector, a spark plug, and an engine control unit ECU (Engine Control Unit). Background technique [0002] With the long-term driving of the vehicle, some engine sensors or actuator components will experience mechanical wear, and the sensitivity of electronic devices will decrease, which will cause the characteristics of some sensors and actuators to deviate, such as fuel injectors, variable valve positives, etc. In addition, the difference in the oil used by the vehicle will also have a certain impact on the original controller parameters, resulting in a decrease in vehicle emission performance. Vehicles equipped with direct-injection...

AI Technical Summary

Problems solved by technology

[0004] For the system disclosed in the patent document (CN2128971Y), its device is only suitable for the self-adaptive adjustment of the carburetor type gasoline engine mixture, which has certain limitations, and the available range is relatively small; The atomization device is installed at the injector, and the emission effect caused by uneven combustion is realized due to the physical characteristics of the components, but it increases the cost of additional components, and with the long-term operation of the system, the components are aging and other problems There are certain uncertain factors; for the system disclosed in the patent document (CN103047035A), the object used is the coke oven gas engine, and the problem to be solved is the deterioration of the engine emission caused by the change of the coke oven gas composition, and the method is only for Bosch's wide-area oxygen sensor system has certain limitations, and the object involved in the present invention is a direct-injection gasoline engine. The self-adaptive adjustment process is based on the engine's operating conditions, and the errors eliminated include wear of mechanical parts and characteristic deviations of sensors and actuators. shift

Images