In order to eliminate the negative effect of temperature to resistive pressure sensor of automobile, a calibration circuit is required based on ZMD chip or MAX1452. The traditional calibration way of ZMD is four-point calibration that has the defects such as inefficiencies and complexity. Thus, a simplified calibration way, named as three-point calibration, is provided which is able to simplify the calibration equipment in practical manufacturing. Considerably, the calibration efficiency is improved from about one hour into 5 minutes every time. After calibrated, the output of pressure sensor change only with pressure and the deviation value is from -0.48%FSO to +0.84%FSO,in the designing range ±2%FSO.
In order to eliminate the negative effect of temperature to automobile pressure sensor whose environment temperature changes from-40°C to 130°C, a calibration circuit is designed based on ZMD chip. The temperature characters of this pressure sensor are: zero point linearly change with temperature at the rate-0.07mV/20°C; strain coefficient linearly change with temperature at the rate 3.27e-4/°C. After calibrated, the output of pressure sensor change only with pressure and the deviation value is from-0.48%FSO to +0.84%FSO,in the designing range ±2%FSO.
The theory of sheet model is used to design the elastic cell of pressure sensor. In this model, the elastic cell shapes like a disk; the ratio of diameter to thickness is in the range from 0.01 to 0.2. According to the calculating result, an elastic cell made by 40CrNiMo with diameter 11mm and thickness 1.6mm can test the pressure form 0 to 100MPa. It is similar with features of calculating result and works well in test.
A pressure sensor used in the Common Rail System is designed to monitor the oil pressure changing form 0 to 200MPa in the temperature from -40 to 130°C. It is composed of elastic cell, strain gage and signal processing circuit. Elastic cell produces liner strain with the oil pressure; strain gage transforms this strain into electrical signal that is enlarged and processed by signal processing circuit. To describe the relation of oil pressure with the strain, the stress distribution and strain of elastic cell with different shape is simulated, applying ANSYS tool in the 200MPa pressure. Then, an acceptable shape is produced and tested. It has the similar features with simulated result and works well.
The design of elastic cell is the essential step in the pressure sensor production. To describe the relation of pressure with the strain, the stress distribution and strain of elastic cell with different shape is simulated, applying ANSYS tools in the 100MPa pressure. Then, an acceptable shape is produced and tested. It has the similar features with simulated result and works well
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