The Effect of Mounting Stress on the Zero Point Output of Pressure Sensors

2013

AMR

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.

Section: Temperature Characteristic Test Of Resistive Pressure Sensormentioning

confidence: 99%

Simplified Calibration of Resistive Pressure Sensor Based on ZMD Chip

2013

AMR

“…Strain gage zero point (strain gage output on zero pressure) will change with temperature because of the difference of swell factor between the elastic cell and strain gage [4]. The relationship of strain gage zero point with temperature is demonstrated in fig.…”

Section: Temperature Characteristic Test Of Pressure Sensormentioning

confidence: 99%

Calibration of Pressure Sensor in Automobiles Based on ZMD Chip

Zhou

2011

AMM

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 strain gage is affixed tightly in the back of the elastic cell bottom. The operating principle of pressure sensor is following: the elastic cell has different elastic strains with different pressures; strain gage changes the strain into electrical signal; signal processing circuit amplifies this signal and produces a signal proportional with pressure to ECU which can control the power, oil wear and ejection of diesel engine by reading this signal [5].…”

Section: Introductionmentioning

confidence: 99%

Design of Pressure Sensor in Common Rail System by ANSYS Tools

Feng

2011

AMM

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.