Control system hardware components The control system hardware mainly includes: main controller, exhaust gas sensor, temperature sensor, alarm circuit and other auxiliary circuits. The circuit of the exhaust gas sensor. This circuit is connected to the AD port of the microcontroller. The circuit consists of two parts: the first part is the sampling circuit part, including the exhaust gas sensor and the resistor R1=100k, which is connected to the single-chip microcomputer from point A and driven by +5V voltage; the second part is the heating part, including the exhaust gas sensor and the resistor R2= 100, its function is to heat the exhaust gas sensor, control its on and off, and drive with +12V voltage. When the heating part is not working, the resistance value of the exhaust gas sensor corresponds to infinity, and the voltage of the AD port is zero; when the heating part is in the normal working state, the normal resistance value of the exhaust gas sensor is 10 to 800 k. The fuzzification of the measured value blurs the aging degree of the exhaust gas sensor. The resistance value of the new exhaust gas sensor is generally 10k or more (less than 10k sensor is a non-conforming product), and gradually deteriorates during use, and the resistance gradually increases. When the resistance value exceeds 800k, the program detects and alarms to prompt the user to replace the exhaust gas sensor.
Obscuring the resistance value of the exhaust gas sensor is very sensitive to the exhaust gas sensor. Under normal conditions, when the oil smoke is encountered, its resistance value is greatly reduced. According to the magnitude of the resistance deviation value, the concentration of the soot can be determined. According to the data provided by the manufacturer and the large amount of experimental data obtained, the fuzzy relation matrix and the fume concentration fuzzy rule table are in the two-input single-output control mode, and the control rule adopted is “ifAandBthenCâ€, so the fuzzy relation matrix Q can be expressed as Q= A × B × C, where: A is the current resistance value R of the exhaust gas sensor (in the case of no soot), B is the resistance deviation value R of the exhaust gas sensor under the action of the soot, and C is the fuzzy value of the soot concentration. Then the fuzzy value of the soot concentration in a certain state can be expressed as C= According to the experiment, it can be determined that when the soot concentration is 0.1≤C≤0.3, low wind is used; when the soot concentration is 0.3
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