Device and method for automatic calibration of engine MAF sensor

Abstract

The embodiment of the invention provides a device and method for automatic calibration of an engine MAF sensor, and belongs to the field of MAF sensors. The method comprises the following steps: calculating the air inflow deviation between the control air flow measured by an engine air inflow temperature and pressure TMAP sensor and the fresh air inflow measured by the MAF sensor; when the deviation is within the range of the correction level and / or the fault error reporting level, reporting the error; carrying out the correction and / or fault reporting. Compared with the prior art, the methodcan judge whether the MAF sensor has the measurement error or not more accurately and timely; the error is actively corrected and / or reported, and the problem that due to the fact that the measurementerror of the MAF sensor exists, engine emission exceeds the standard or the smoke intensity is deteriorated is solved.

Description

technical field [0001] The invention relates to the field of engine air flow (Mass Air Flow, MAF) sensors, in particular to a device and method for automatic calibration of engine air flow MAF sensors. Background technique [0002] The MAF sensor is a sensor that measures the air intake of the engine. It is generally installed on the pipeline section between the engine air filter and the inlet of the engine supercharger. Its measurement characteristics are obviously affected by factors such as pipeline layout, direction, and resistance. Generally, different vehicles or different pipeline layouts need to adjust the calibration of the MAF sensor separately. If the intake pipe of the vehicle has been modified or has air leakage and other problems, it will directly lead to obvious errors in the measurement of the MAF sensor. The MAF sensor measures the fresh air intake of the engine. If there is a deviation in the measurement, it will lead to deviations in the engine air volu...

AI Technical Summary

Problems solved by technology

Generally, the deviation of MAF sensor measurement cannot be independently identified and diagnosed. Usually, it is necessary to wait until other systems have obvious faults before suspecting the problem of the MAF sensor.

For example, if the engine exhaust NOx exceeds the limit and cannot pass the sampling inspection, the engine power is insufficient, and the engine smoke is serious, etc., it will be suspected that the MAF sensor is faulty.

In this way, not only the discovery of the problem is very lagging, but also has great damage to the engine.

Images