Control method for ensuring air inlet flow precision

Abstract

The invention discloses a control method for ensuring air inlet flow precision. The control method for ensuring air inlet flow precision comprises an engine, and further comprises an air filter, a flow sensor, an air compressor, an intercooler and a throttle valve which are sequentially connected to an air inlet pipeline of a cylinder body, a turbine, a post-processing system and a silencer are sequentially connected to an exhaust pipe of the cylinder body, an ECU is connected to an engine, a calibration value MAP of the air inlet flow is calibrated in the ECU, the flow sensor is electricallyconnected with the ECU, the flow sensor measures the real-time air inlet flow Q of the air inlet pipeline of the cylinder body, and the calibration value MAP is compared with the real-time air inlet flow Q; when the difference value between the calibration value MAP and the real-time air inlet flow Q is greater than a set range A, maintenance reminding of the flow sensor is carried out; when the difference value is larger than a set range B, replacement reminding of the flow sensor is conducted; and the control of the air inlet flow precision is fully guaranteed, and the real-time air inlet flow Q is the measurement value of the flow sensor under the steady-state condition of the engine. The method has the advantages and effects that the air inlet flow precision can be guaranteed in real time, and the running state of the engine is guaranteed.

Description

technical field [0001] The invention relates to a control method for ensuring the accuracy of intake air flow. Background technique [0002] The intake air flow sensor is used to collect the signal of the intake air flow of the engine. The engine with EGR adopts the closed-loop control of the fresh intake air flow. If the intake air flow sensor is not maintained and replaced in time, the intake air flow measurement will be inaccurate Problems lead to changes in the opening of the EGR valve that cannot meet the working needs of the engine, which in turn leads to deterioration of engine performance and emissions. That is, the engine with EGR needs to accurately measure the intake air flow through the intake air flow sensor to ensure the normal operation of the engine. [0003] In the prior art, a Chinese invention patent with the patent number 2019113463659 discloses an intake air flow sensor inspection method, which uses the intake air flow sensor to close the exhaust gas re...

AI Technical Summary

Problems solved by technology

Its disadvantage is that it needs to collect data from multiple sensors at the same time, and calculate the multiple data with a certain formula, and then obtain the actual intake air volume. It is difficult to ensure the accuracy of multiple sensors, so the actual calculated actual intake air volume There may be errors, so there will be certain problems when judging the intake air flow sensor

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