Novel intake flow sensor calibration K value automatic refreshing and writing method

Abstract

The invention relates to a novel intake flow sensor calibration K value automatic refreshing and writing method and belongs to the technical field of intake flow measurement of a national VI electriccontrol system of an internal combustion engine. The method comprises the following steps: an ECU sends a command for reading a K value to a TFI4 sensor; within 150 ms, the ECU receives a returned K value and reads the K value; if the returned K value is read invalid, the command for reading the K value is sent again, and if the K value is read invalid for five consecutive times, the process is ended; the ECU reads the returned K value for verification, and if the K value is consistent through verification, the process is finished; if not, the command for reading the K value is sent to the sensor; if a write-in success state is fed back, the process is ended; and if a write-in failure state is fed back, the ECU re-reads the returned K value for verification, and if the write-in failure state is fed back for five consecutive times, the process is ended. The method not only solves the limitation that the calibration K value refreshing and writing can only be realized by manufacturers, but also can adapt to development of multiple models in a main engine plant, so that workload is greatly reduced, and timeliness and convenience are embodied.

Description

technical field [0001] The invention belongs to the technical field of air intake flow measurement of national VI electronic control systems of internal combustion engines, and in particular relates to an automatic writing method for the K value of a new air intake flow sensor mark. Background technique [0002] During the flashing process, the calibration quantity K value of the intake air flow sensor (hereinafter referred to as TFI4 sensor) can only be flashed by the manufacturer’s unique equipment, and cannot be automatically flashed by the engine control unit. Moreover, after replacing the new sensor in the aftermarket, the calibration K value cannot be written into the sensor in a timely and effective manner, which will lead to inaccurate intake air flow measured by the TFI4 sensor, which will lead to poor combustion control of the engine and affect the emission exceeding the standard. Contents of the invention [0003] In order to overcome the above-mentioned defects...

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Problems solved by technology

[0003] In order to overcome the above-mentioned defects existing in the prior art, the purpose of the patent of the present invention is to provide a new type of automatic writing method for the calibration value K of the intake air flow sensor, so as to solve the problem that the existing products cannot rely on the manufacturer's unique equipment to write the label. Quantitative K value problem

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