Flow sensor
AssigneeMitsubishi Electric Corporation
InventorsKazuhiko Ohtsuka, Masahiro Kawai
Life of this patent
Estimating the term…
Abstract
A flow sensor need not have any special terminal for voltage value supply, and can obtain a ratiometric output function at low cost and small size. A calculation circuit calculates, as a reference voltage Vr, a voltage value Vref of an A/D conversion reference power supply in a fuel injection control unit from a terminal voltage of a temperature sensor, and supplies the reference voltage Vr thus calculated by the calculation circuit to a ratiometric output circuit. As a result, a ratiometric output function can be achieved while making it unnecessary a special terminal used only for the purpose of supplying the voltage value Vref.
Claims8
A flow sensor which is connected to a fuel injection control unit having an A/D conversion reference power supply therein, said flow sensor comprising:
- a sensor element which is formed integral with said flow sensor and to which electric power is supplied from said A/D conversion reference power supply in said fuel injection control unit;
- a calculation circuit that calculates a voltage value of said A/D conversion reference power supply as a reference voltage;
- and
- a ratiometric output circuit that outputs a voltage or current proportional to the voltage value of said A/D conversion reference power supply based on said reference voltage calculated by said calculation circuit.
- wherein said calculation circuit calculates said reference voltage based on a voltage supplied to said sensor element.
Dependencies are inferred from the claim text.