Refinement of the fuel flow meter. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices
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When operating a microcontroller fuel flow meter, the description of which is published in "Radio", 2001, No. 11, p. 32-34, it was found that after turning off and then turning on the ignition of the car, the accumulated value of the amount of fuel consumed by the device is sometimes distorted and completely unexpected numbers appear on its LED indicator. The reason for this is a too slow voltage drop in the on-board network, comparable in speed to the voltage drop on the capacitor C3 of the flow meter. This situation occurs, for example, if an UMZCH or other consumer with large capacitors in the power circuit is connected to the vehicle's on-board network.
To eliminate the defect, it is enough to install a voltage drop detector KR1171SP73 in the flowmeter, connecting it according to the circuit shown in Fig. 1.
Now the diode VD1 of the flowmeter is no longer needed, it can be replaced with a jumper. When the supply voltage drops below its threshold (7,3 V), the detector will send a signal to the microcontroller. The latter will receive a sufficient margin of time at any rate of change in the voltage of the on-board network to perform the operations of writing the accumulated data to the internal non-volatile memory.
The KR1171SP73 microcircuit can be replaced with a similar one with a lower response threshold. On fig. 2 shows how to connect, for example, the KR1171SP47 detector.
The desired value of the threshold voltage is set by selecting the resistor R1.
Author: A. Dolgiy, Moscow
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