Why should the air flow sensor and intake pressure sensor be installed at the same time?

According to the respective function analysis of these two sensors. 1. The intake manifold absolute pressure sensor can calculate the air mass. The pressure sensor can directly monitor the absolute pressure behind the throttle and indirectly calculate the air quality. According to Clabron equation. PV=mRT/M=nRT2。 The intake manifold absolute pressure sensor can directly detect atmospheric pressure. The atmospheric pressure is different, the air density is different, and the quality entering the engine is different. It must be monitored to accurately calculate the mass entering the cylinder. 3. The intake manifold absolute pressure sensor can make up for the air leakage behind the throttle. If there is air leakage behind the throttle, the intake manifold absolute pressure sensor can monitor the increase of air intake and control the idle valve to reduce the number of steps, thus reducing the air intake and achieving the target idle speed control. 4. The intake manifold absolute pressure sensor can calculate the EGR rate, which will affect the power and must be controlled within a certain range. 5. The intake manifold absolute pressure sensor can calculate the fuel injection pressure difference. For the constant pressure fuel pressure regulator, the fuel pressure is constant under different working conditions, but the pressure sprayed by the injector behind the throttle valve will change, so this phenomenon is not considered when bringing back oil. 6. The air flow sensor monitors the intake air flow. The air flow sensor monitors the intake air flow and knows the cross-sectional area. The flow rate that will enter the cylinder after multiplication (it can be said that the unit volume is known). Computers know that air has different densities at different temperatures. The computer also needs to know the temperature entering the cylinder in order to accurately calculate the intake mass of the cylinder. You can also think that the flow is mainly caused by the pressure difference before and after the throttle. If the computer knows the outside atmospheric pressure, it can calculate the pressure behind the throttle. If there is no intake manifold pressure sensor, you may also see the pressure behind the throttle. To sum up: from the above analysis, it seems that only the absolute pressure sensor of the intake manifold can stop the car, or only the air flow sensor can stop the car. It would be better if there are these two sensors. The measurement of flow sensor is more accurate, and the absolute pressure sensor is generally the main one for assistance.