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Intake pressure sensor output characteristics
- Jul 26, 2018 -

When the engine is working, the vacuum degree, absolute pressure, and output signal characteristic curve in the intake manifold are changing as the throttle opening changes.
The D-type injection system detects the absolute pressure in the intake manifold behind the throttle. The rear of the throttle reflects both the vacuum and the absolute pressure. Therefore, some people think that vacuum and absolute pressure are a concept. In fact, this understanding is one-sided. of. Under the condition of constant atmospheric pressure, the higher the vacuum in the manifold, the lower the absolute pressure in the manifold is, and the vacuum is equal to the difference between the atmospheric pressure and the absolute pressure in the manifold. The higher the absolute pressure in the manifold, the lower the vacuum in the manifold, the absolute pressure in the manifold is equal to the difference between the atmospheric pressure outside the manifold minus the vacuum, that is, the atmospheric pressure is equal to the sum of the vacuum and the absolute pressure. After the relationship between atmospheric pressure, vacuum and absolute pressure, the output characteristics of the intake pressure sensor are clear.
During engine operation, the smaller the throttle opening, the greater the vacuum of the intake manifold, the smaller the absolute pressure in the manifold, the smaller the output signal voltage, the larger the throttle opening, and the vacuum of the intake manifold. The smaller the degree is, the larger the absolute pressure in the manifold is, and the larger the output signal voltage is. The output signal voltage is inversely proportional to the degree of vacuum in the manifold, which is proportional to the absolute pressure in the manifold.

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