Air flow measurement system mixing temp. and flow signals - converts analogue temp.-dependent voltage and flow-dependent pulse repetition frequency into single signal for transmission

摘要

A mixer (4) operates on the outputs of an air temp. sensor (3) and an air flowmeter (2) which consists of a voltage output section and a voltage-to-frequency converter (12). The two signals are superimposed for transmission over a single path (S). All three devices are formed on a printed circuit board from which the leads to a heating resistance (RH), an air temp.-measuring resistance and a temp.-sensitive resistance (RT) in the air duct (5) protrude through a resin casting. USE/ADVANTAGE - In inlet manifold of vehicle combustion engine. Weight of vehicle can be reduced for economy of fuel.