Automobile engine manifold air inlet system based on MEMS pressure sensor

Abstract

The invention discloses an automobile engine manifold air inlet system based on an MEMS pressure sensor, which comprises a sealing cylinder, a monitoring air supply device for supplying air to an engine manifold is arranged in the sealing cylinder, and the monitoring air supply device comprises an air suction pipe, a check valve, an MEMS air pressure sensor, a variable flow mechanism and an air outlet pipe, the pipe diameter of the air outlet pipe is larger than that of the air suction pipe; the flow changing mechanism is used for changing the air suction frequency in the air suction pipe and comprises a rubber sliding plug and a precision spring. The air suction pipe, the air outlet pipe and the flow changing mechanism are arranged, the MEMS air pressure sensor is installed on the air suction pipe, the air inlet frequency in the air suction pipe is changed through the flow changing mechanism, air in the air suction pipe can flow constantly and stably, and a compensation value is given to the MEMS air pressure sensor according to the ratio of the air outlet pipe to the air suction pipe; in this way, the MEMS air pressure sensor can monitor the air inlet pressure of the engine in real time, and meanwhile impact damage to the MEMS air pressure sensor caused by pulse airflow can be avoided.

Description

technical field [0001] The invention relates to the technical field of application of MEMS pressure sensors, in particular to an automobile engine manifold intake system based on MEMS pressure sensors. Background technique [0002] MEMS sensors, also known as micro-electromechanical systems, are made of semiconductor technology and materials. They are small in size and high in performance, and are widely used in automotive electronic control systems. [0003] Among them, for the automobile engine air intake system, MEMS pressure sensors are generally used to detect the intake air pressure, so as to monitor and control the engine air intake in real time. At present, the MEMS pressure sensor is generally installed in the engine intake manifold, and the engine intake manifold only supplies air to a single engine cylinder, and due to the movement characteristics of the piston inside the engine cylinder, the manifold is in the form of pulses when supplying air. When the airflow ...

AI Technical Summary

Problems solved by technology

At present, the MEMS pressure sensor is generally installed in the engine intake manifold, and the engine intake manifold only supplies air to a single engine cylinder, and due to the movement characteristics of the piston inside the engine cylinder, the manifold is in the form of pulses when supplying air. When the airflow flows in the manifold, it will generate bursts of impact on the sensitive elements of the MEMS pressure sensor. After long-term impact, the sensitivity of the sensitive elements will inevitably decrease, resulting in a decrease in the accuracy of data collected by the MEMS pressure sensor.

Images