초록 ▼

A mass flow rate sensor for providing an output signal related to mass flow rate past the sensor includes a bridge circuit for generating a first mass flow rate-related signal containing temperature-related errors and mass flow rate-related errors, a resistance for generating a second signal providi

A mass flow rate sensor for providing an output signal related to mass flow rate past the sensor includes a bridge circuit for generating a first mass flow rate-related signal containing temperature-related errors and mass flow rate-related errors, a resistance for generating a second signal providing temperature error correction, and a resistance for generating a third signal providing mass flow rate error correction. Electrical circuitry operatively couples the bridge circuit and resistances together to provide the output signal. A method for providing an output signal related to mass flow rate includes the steps of generating a first mass flow rate-related signal containing temperature-related errors and mass flow rate-related errors, generating a second signal providing temperature error correction, generating a third signal providing mass flow rate error correction, and combining the first, second and third signals together to provide the output signal.

대표청구항 ▼

A bridge type mass air flow rate sensor for generating an output signal related to mass air flow rate, comprising a bridge circuit having legs; the bridge circuit having a mass air flow rate sensing first element in a leg; the first element comprising a first resistor, the resistance of which change

A bridge type mass air flow rate sensor for generating an output signal related to mass air flow rate, comprising a bridge circuit having legs; the bridge circuit having a mass air flow rate sensing first element in a leg; the first element comprising a first resistor, the resistance of which changes as the temperature of the element changes; the first element responding to changes in air flow rate by changing temperature; the bridge circuit being balanced when the first element is at a particular temperature; the resistance of the first resistor balancing the bridge when the first element is at the Particular temperature; an ambient air temperature sensing second element in a leg of the bridge circuit for determining the resistance of the first resistor which will balance the bridge circuit; the second element including means for responding to changes in ambient air temperature and changing the resistance of the first element at which the bridge circuit is balanced, thus changing the particular temperature; means for supplying operating voltage to the bridge circuit including means responsive to bridge circuit imbalances caused by changes in the resistance of the first element for changing the power supplied to the first element to maintain the first element at the particular temperature; means for sensing the current provided to the first element and producing an output signal related to mass air flow rate sensed by the first element; means for sensing changes in the resistance of the first element at which the bridge is balanced and producing a correction factor; and means for applying the correction factor to the output signal.