How to test a digital air flow meter?
When testing a digital air flow meter, the output signal must be correctly identified: these units often measure both air flow and intake air temperature and give each a digital output.
What are the requirements for a flow meter?
This design fulfils the basic market requirement for the Flow meter: low-power, low-cost, able to run on battery, and with automated meter reading (AMR). The main attraction of this design is that the flow sensing module of the MCU keeps running even when the MCU goes into low-power mode.
Where is the hot wire in an air flow meter?
As such, they are used by the Engine Control Module (ECM) as the primary engine load sensor. Hot wire air flow meters have a heated wire element located within the intake air flow. The voltage, and hence current, through the hot-wire circuit is varied to keep it at a fixed, hot, temperature.
How does a Freescale flow meter keep time?
Freescale Semiconductor, Inc. 5 This meter supports a battery driven power supply and is capable of time keeping. It senses the signals from the flow sensor, calculates the flow and then accumulates it. The total flow accumulated and the monthwise profile of the flow are stored and updated in the memory.
Where can I find an air flow meter?
Go to the drop-down menu bar in the lower left corner of the Waveform Library window and select Mass air flow sensor (MAF) hot wire. Air flow meters measure the quantity of filtered air entering an engine. As such, they are used by the Engine Control Module (ECM) as the primary engine load sensor.
Where is the mass air flow sensor located?
The MAF (mass air flow) sensor is a sensor mounted in a vehicle’s engine air intake tract downstream from the air filter, and is used to measure the volume and density of air being drawn into the engine.
This design fulfils the basic market requirement for the Flow meter: low-power, low-cost, able to run on battery, and with automated meter reading (AMR). The main attraction of this design is that the flow sensing module of the MCU keeps running even when the MCU goes into low-power mode.
Freescale Semiconductor, Inc. 5 This meter supports a battery driven power supply and is capable of time keeping. It senses the signals from the flow sensor, calculates the flow and then accumulates it. The total flow accumulated and the monthwise profile of the flow are stored and updated in the memory.