An Injector Flow Correction Method Based on Vehicle Conditions

Abstract

A fuel injector flow correction method based on vehicle conditions, the method first determines whether the vehicle state meets the SPC self-learning condition, if so, selects a rail pressure point to be learned on the selected fuel injector, and then the controller The rail pressure point is controlled to reach its set value, and then the single-step progressive pulse width adjustment injection test is performed on the selected injector. The difference between the deviation value change and the theoretical change value. If the difference between the deviation value change and the theoretical change value is within the set tolerance range, the deviation value change curve and the theoretical change value curve are normalized to obtain the actual MDP value. Then determine the deviation of the actual MDP value compared to the MDP design value, and finally use the calibration table to compensate for the MDP deviation. The design is not only simple and convenient for the correction process, low cost, but also has good robustness.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to a fuel injector flow correction method based on vehicle conditions. Background technique [0002] The car engine injects fuel, mixes fuel and air in a certain proportion, and burns to provide energy. The fuel injection quantity of the engine usually calculates the fuel injection time required by the engine under different conditions, that is, the fuel injection quantity, according to the signals transmitted by the engine speed, vehicle speed, throttle position, water temperature, air flow meter or pressure sensor. [0003] The precise control of fuel injection quantity can reduce fuel consumption, improve fuel utilization rate, and reduce exhaust emissions, which is of great significance to environmental protection. The aging and wear of fuel injectors will directly affect the accuracy of fuel injection quantity, so it is necessary to adjust fuel injection quantity. ...

AI Technical Summary

Problems solved by technology

The method currently used is mainly to correct the small fuel volume of the injector through the cylinder pressure detection under the condition of the engine running backwards. In this method, not only the cylinder pressure sensor needs to be installed to detect the cylinder pressure, but the cost of the engine is increased. Moreover, the calibration process is more complicated and the robustness is poor.

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