Car fuel tank storage oil volume indicator, Fuel Indicator
Keywords: car fuel tank storage oil volume indicator
Car fuel tank storage oil volume indicator
Although the modern vehicle is designed to indicate the oil consumption of fuel consumption. However, it usually uses an analog-to-reference method labeled with red markers, which is easy to confuse, nor is not very accurate. This article describes the oil tank at any time. When the amount of oil is lowered below the specified oil level, inform you through the LED indicator, and issue an audible alert when it is close to the dangerous oil level.
The fuel detection system consists of a floating sensor and current table (oil meter) mounted on the tank. The floating gas-driven sensor is connected to the transformer inside the fuel tank, and the varistor has a high resistance when the fuel tank varies, and the resistance is reduced when the fuel tank is full. The working process of the fuel monitoring circuit is: activate the buzzer before the fuel tank is almost split by detecting the voltage variations at both ends of the oil. The A point of the circuit is connected to the inner end of the tank, and the B point is connected to the body.
The indicator circuit consists of an op amp CA3140 (IC1), two 555 timer chips (IC2, and IC3), and decimal counter CD4017 (IC4). The IC1 is connected to a voltage comparator, which is inverted input 2 to connect the reference voltage, and the same phase input terminal 3 pin is connected to the oil meter input by R1, and the changed voltage is extracted. When the 3 foot voltage is higher than 2 foot voltages, the output of the IC2 becomes high, so that the green LED (LED1) is emitted, and this state is maintained until the 3 foot voltage is below 2 foot voltages. After the foot voltage is low, the IC1 output is from high to low, and a negative pulse to trigger single stability circuit IC2 is sent via C1. After IC2 trigger, its output becomes high, and maintains a single order of monocenees determined by R5 and C2, approximately 4 minutes.
The output of the IC2 is powered by the diode D2 pair oscillator IC3, which is oscillated by R6, R7, VR2, and C4. From the components value in the figure, the turning time is 27 seconds, and the disconnect time is 18 seconds. The output pulse of IC3 is sent to the clock input pin (14) of IC4, and its output is also higher as the input pulse. When the circuit is turned on, if the fuel in the vehicle fuel tank is sufficient, the LED1 and LED2 illuminate. When the fuel is below the minimum reservoir, the output of IC1 becomes low, and the LED1 is off, and the IC2 2 foot receives the negative pulse. The output of IC2 becomes high and maintained for about 4 seconds. In this time, IC4 ( 14) The foot from the IC3 output clock pulse (from low to high).
After the first pulse, the QO output of the IC4 becomes high, indicating the green indicator LED2 of the safe oil level luminous for about 50 seconds. After the second pulse input, the Q1 output of IC4 becomes high, indicating the yellow indicator LED3 of the low oil level, and the circuit has a audio alarm, reminding you that fuel is about to finish. After the third pulse input, the LED3 is off, the buzzer stops. From this to Q5 output, there is also a gap of 2 or a half.
When the Q5 output is high. The red indicator LED 4 indicating the lowest oil level is shown in about 4 minutes, and thereafter the IC3 is interrupted. The output status of Q5 is constant, and it is maintained until its (14) and receives the next next to the lower clock input. Therefore, LED4 will continue to illuminate, and the buzzer has always been called, which means that the car fuel will be completed.
The IC4's Q6 output is connected to its reset foot (15) by D3, which means that the count starts from Q0 when Q5 is higher. C5 is used as a reset to IC4 when S1 is closed. The output of the IC1 is also connected to the reset pin of the IC4 via D1, so the oil tank is always illuminated, and the amount of oil in the fuel tank is sufficient. After the circuit is installed, the VR1 is adjusted to reduce the voltage on the IC2 2 to 1.5V. After the point A is connected to one end of the oil gauge floating sensor, the green indicator LED1 and LED2 illuminate, indicating that the fuel is normal. VR2 can be used to set the on time of the IC3 in about 20 seconds.
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