Pressure sensing systems and methods

A pressure sensing system of an exhaust aftertreatment system of vehicle, comprising:

• a pressure sensor including:
• a housing;
• a substrate that is fixed within the housing, that includes a first side that is in contact with a fluid of the exhaust aftertreatment system, and that flexes based on a pressure of the fluid at the first side;
• a sense circuit that is implemented one of on and within the substrate and that includes:
• a first resistor and a second resistor that:
• are connected in series between a first reference potential and a ground potential;
• and
• vary a first potential at a first node between the first resistor and the second resistor based on flexing of the substrate;
• a third resistor and a fourth resistor that:
• are connected in series between the first reference potential and the ground potential in parallel with the first and second resistors;
• and
• vary a second potential at a second node between the third resistor and the fourth resistor based on flexing of the substrate;
• and
• a pressure control module that includes:
• a measure circuit that includes:
• a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistors that are connected in series between the first reference potential and the ground potential and that:
• output a third potential at a third node between the fifth resistor and the sixth resistor;
• output a fourth potential at a fourth node between the sixth resistor and the seventh resistor;
• and
• output a fifth potential at a fifth node between the seventh resistor and the eighth resistor;
• a first switch connected to selectively connect and disconnect the first potential to and from a first end of a capacitor;
• a second switch connected to selectively connect and disconnect the second potential to and from a second end of the capacitor;
• a third switch connected to selectively connect and disconnect the third potential to and from the first end of the capacitor;
• a fourth switch connected to selectively connect and disconnect the fourth potential to and from the first end of the capacitor;
• a fifth switch connected to selectively connect and disconnect the fifth potential to and from the second end of the capacitor;
• the capacitor;
• a sixth switch connected to selectively connect and disconnect the first end of the capacitor to an input of an amplifier;
• the amplifier;
• and
• a seventh switch connected to selectively connect and disconnect the second end of the ground potential;
• and
• a control module that is configured to:
• selectively switch the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, and the seventh switch;
• sample an output of the amplifier;
• and
• convert samples of the output of the amplifier into corresponding digital values.