Measuring device for a motor vehicle

A device for measuring at least one parameter of a motor vehicle, said device comprising at least one reference resistor of a predetermined value and at least two measuring branches, each of said at least two measuring branches comprising at least a first element comprising a resistor or a resistive sensor, able to be connected to a voltage supply, and a second element comprising a resistor or a resistive sensor able to be connected to a ground, the first element and the second element being connected to one another at a center tap, the center taps of the at least two measuring branches being connected to one another in pairs by a third element comprising a resistor or a resistive sensor, said device comprising a control module able to:

• a) connect the center tap of the second measuring branch to the voltage supply or to ground,
• b) measure the value of the voltage defined between the center tap of the first measuring branch and ground,
• c) calculate the resistance value of the first resistive sensor and the resistance value of the fourth resistive sensor from:
• d) a voltage value measured between the center tap of the first measuring branch and ground when the center tap of the second measuring branch is connected to the voltage supply,
• e) a voltage value measured between the center tap of the first measuring branch and ground when the center tap of the second measuring branch is connected to ground,
• f) a value of the supply voltage and
• g) the predetermined value of the reference resistor,
• h) determine the measurement of the parameter measured by the first resistive sensor and the fourth resistive sensor,
• i) connect the center tap of the first measuring branch to the voltage supply or to ground,
• j) measure the value of the voltage defined between the center tap of the second measuring branch and ground,
• k) calculate the resistance value of the second resistive sensor and the resistance value of the third resistive sensor from:
• l) a voltage value measured between the center tap of the second measuring branch and ground when the center tap of the first measuring branch is connected to the voltage supply,
• m) a voltage value measured between the center tap of the second measuring branch and ground when the center tap of the first measuring branch is connected to ground,
• n) a value of the supply voltage and
• o) a resistance value of the fourth resistive sensor,
• p) determine the measurement of the parameter measured by the second resistive sensor and the third resistive sensor.