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Based on the microcomputer control of oil filter machine control system design

Number of visits: Date:2014-02-25 18:41

Abstract:

Main loop ac contactor 4, air switch 2, MCS-51 series of A single-chip computer chip 8031, various peripheral interface chip, A/D converter, temperature sensors, pressure sensor, photoelectric couplers pieces, contact the drive circuit, the LED display circuit, etc. Control system shown as shown in figure 1.

1 control system mainly hardware

Main loop ac contactor 4, air switch 2, MCS-51 series of A single-chip computer chip 8031, various peripheral interface chip, A/D converter, temperature sensors, pressure sensor, photoelectric couplers pieces, contact the drive circuit, the LED display circuit, etc. Control system shown as shown in figure 1.

 

1.1 the input signal circuit temperature testing system of basic

1 control system mainly hardware

Main loop ac contactor 4, air switch 2, MCS-51 series of A single-chip computer chip 8031, various peripheral interface chip, A/D converter, temperature sensors, pressure sensor, photoelectric couplers pieces, contact the drive circuit, the LED display circuit, etc. Control system shown as shown in figure 1.

 

1.1 the input signal circuit temperature testing system of basic

Based on the microcomputer control of oil filter machine design of the control system of the 2011-06-07 08:41:14 sources: the Internet 0 lead by vacuum pump motor said system and oil pump motor, requirements of each one with single-chip computer finish line pressure testing and fuel tank temperature control. With pressure sensors to collect data and send SCM processing. System by using two groups of heating tube heating, each group of power for 24 kW. With the temperature sensors to collect data and send SCM processing. When the temperature reaches the requirement, to cut off the vacuum pump motor and at any time show the current temperature, contactor trip through code salver pull temperature setting into microcontroller. System, not only are turning motor reverse, control circuit should have reverse alarm device. The main loop empty on or contact is achieved by single-chip microcomputer control circuit, control system. System startup sequence is: oil pump motor, vacuum pump motor, heating tube. Two sets of heating tube can be separately, but only heating and stop vacuum pump motor heating tube after the launch to start and run. 1 control system mainly hardware structure of main loop ac contactor 4, air switch 2, MCS-51 series of A single-chip computer chip 8031, various peripheral interface chip, A/D converter, temperature sensors, pressure sensor, photoelectric couplers pieces, contact the drive circuit, the LED display circuit, etc. Control system shown as shown in figure 1. 1 control system mainly hardware structure of main loop ac contactor 4, air switch 2, MCS-51 series of A single-chip computer chip 8031, various peripheral interface chip, A/D converter, temperature sensors, pressure sensor, photoelectric couplers pieces, contact the drive circuit, the LED display circuit, etc. Control system shown as shown in figure 1. 1.1 the input signal circuit temperature testing system of basic 1.2 output signal circuit of the basic circuit using ac contactor controlling assolenoid style design, namely the two-way thyristor drive ac contactor KM coil. Rated voltage of ac contactor coil working voltage of 2 ~ 3 times, rated current of ac contactor coil working current of 1.5 to 2 times. Here for 220 V ac voltage, choose 10 A / 660 V two-way thyristor. Optical coupler MOC3041R input by 7407, by MCU P1.0 mouth output low level, the thyristor conduction, contactor KM and absorption. Otherwise, the contactor KM release. Finally again by ac contactor contact control power circuit. The output signal circuit as shown in figure 3 below. 3 control system testing program design temperature testing temperature program function is continuous 4 times A/D conversion and calculating the average of the conversion, the A/D conversion using inquires the way. To ensure the reliability of data by average filtering method, software filter. Temperature control program function is the temperature of the set value assessment will compare with, if more than 2 ℃, set value assessment is shut down a heating tube; If more than 5 ℃, the set value assessment, 2 sets off heating tube; Otherwise don't adjust. If less than the set value, assessment is to restart heating tube 1, 2, in order to ensure that continue to heat. A/D converter using AD0809 chip, the filter to debug and programming convenient calculation, H ~ FFH take corresponding 0 ~ 5 V and 0 ~ 128 ℃, that is, each corresponding to 1 ℃, the digital quantity for H, simulation of voltage of 0.039 V / ℃, commissioning, when the temperature is 0 ℃, adjust RP1, the output voltage for put 0 V, AD0809 after converting the digital quantity for, when the temperature H 128 ℃, RP2 adjustment, the output voltage for put 5 V, AD0809 after converting the digital quantity for FFH. 4 and the language of the control system and the PLC control, do not need to increase compared new circuit, is able to detect temperature, and transform shows in software algorithm, the design of hardware, filter technology in the output circuit adopts photoelectric couplers, realize a photoelectric isolation and prevent contactor suck in the process of arc and interference. The control system used in filter on the oil has received good use effect, has had the good economic efficiency and the social efficiency, has the very good promotion value

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