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1 Inlet pressure signal, 2 5V reference voltage, 3 5V reference voltage grounding, 4
Throttle plate position signal, 5 Inlet temperature signal
2. Working principle
The three in one sensor is the function of the intake manifold absolute pressure sensor,
the function of the intake manifold absolute temperature sensor and the throttle opening
function are integrated into one whole.
The absolute pressure sensor of intake manifold is composed of pressure conversion
element (elastic diaphragm + strain resistance) and signal conditioning circuit which
amplifies the output signal of conversion element. One side of the pressure conversion
element is a vacuum chamber, and the other side is introduced into the intake manifold
pressure, so the higher the absolute pressure in the intake manifold, the greater the
deformation of the diaphragm, which is proportional to the pressure.
The resistance of the strain resistor attached to the elastic diaphragm changes in direct
proportion to its deformation. Using this principle, the pressure change in the intake
manifold can be converted into an electrical signal.
The core temperature sensor of engine intake air temperature sensor is composed of
semiconductor thermistor with negative temperature coefficient characteristic (NTC).
The temperature sensor usually needs a special measuring circuit to test its
resistance characteristics. The output characteristic of the semiconductor thermistor with
negative temperature coefficient is that the resistance of the thermistor is inversely
proportional to the temperature, that is, when the temperature increases, the output
resistance of the thermistor decreases; When the temperature decreases, the output
resistance of the thermistor increases.
The throttle sensor is an angle sensor with linear output. Its essence is an angular
displacement sliding rheostat, which is composed of two arc-shaped sliding contact
resistors and two sliding contact arms. The rotating shaft of the sliding arm is connected
with the throttle shaft on the same axis. Add 5V supply voltage US to both ends of sliding
contact resistance. When the throttle valve rotates, the sliding arm rotates with it and
moves on the sliding resistance at the same time, and the potential UP of the contact is
led out as the output voltage, so that the opening angle signal of the throttle valve can be
converted into the voltage signal.
3. Basic parameters
Pressure test range: 10 ~ 115kPa;
Ultimate pressure: 655KPa (exceeding this pressure will cause permanent damage)
Working temperature range: - 40 ℃ ~ 125 ℃
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