The workings of a pressure sensor and the fault detection

Air intake pressure sensor detection section, valve rear intake manifold absolute pressure, pressure sensor according to the size of the engine speed and load test of manifold absolute pressure, and then converted to voltage signal to the electronic controller ( ECU) The size of the ECU according to the signal voltage, control the size of the basic fuel injection quantity.

air intake pressure sensor sort is more, such as pressure sensitive resistive, capacitive, due to the pressure sensitive resistance type has a fast response time, high precision, small size and flexible installation etc, and therefore is widely used in type D injection system.

the working principle of pressure sensitive resistance type air intake pressure sensor and strain resistor R1, R2, R3 and R4, they constitute hui, a bridge and with silicon diaphragm adhesive, silicon diaphragm within the manifold absolute pressure under the action of deformation, thus cause the change of the strain resistance R value, the higher the manifold absolute pressure, the greater the deformation of silicon diaphragm, and thus the greater the resistance R resistance changes also, i. e. , the change of the silicon diaphragm mechanical into electrical signals, after again by integrated circuit amplifier output to the ECU.

check the fault on the construction site, mostly due to failure of pressure sensor and installation method, sums up several aspects.

1, a components ( Orifice plate, remote measuring joint, etc. ) Blockage or type of installation is wrong, pressure points is not reasonable.

2, pressure pipe leakage or congestion, liquid in the tube with residual gas in the remaining liquid or gas tube, flange transmitter process of sediment and form the measurement of dead zone. Connection is not correct,

3, transmitter power supply voltage is too high or too low, indicating meter and meter terminal joint poor contact.

4, not in strict accordance with the technical requirements for installation, installation and site environment does not meet the technical requirements.

the above pressure sensor and the failure causes of pressure transmitter transmitter output is not normal or measurement is not accurate, but after a careful check, in strict accordance with the technical requirements for use and installation, take effective measures in time, the problem can be ruled out, for can't handle failure, transmitter should be sent to the laboratory or the manufacturer do further examination.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor