RU1612794C

RU1612794C - Air feeding apparatus

Info

Publication number: RU1612794C
Authority: RU
Inventors: В.А. Бровкин; Е.Л. Хрекин; О.А. Сафонов; Н.И. Писарев
Original assignee: Научно-производственное предприятие "Наука"
Priority date: 1988-11-14
Filing date: 1988-11-14
Publication date: 1994-07-30

Abstract

FIELD: mechanical engineering. SUBSTANCE: apparatus has control unit 9, time counters 20 and 21, choke device 5, limit switches 7 and 8. Apparatus is considered to be in working order, when, having signals of control unit 9 during time period, set by counters 20 and 21, choke device 5 is set in position, that corresponds to limit switches 7 and 8 are switched on. In case during the time switches 7 and 8 in presence of control unit 9 output signals are not made, then apparatus is out of order. In case during counting time unit 9 signals are absent and limit switches 7 and 8 are not made, then apparatus is in order. In case apparatus is out of order, selection reserve line 3 is switched on. EFFECT: increased reliability and expanded functional capabilities due to terms to exercise control in pulsed mode of operation. 1 dwg

Description

Изобретение относится к средствам управления подачей воздуха. The invention relates to air supply controls.

Целью изобретения является повышение надежности и расширение функциональных возможностей устройства за счет возможности контроля подачи в импульсном режиме работы. The aim of the invention is to increase reliability and expand the functionality of the device due to the ability to control the feed in a pulsed mode of operation.

Критерием отказа устройства является сравнение фактической суммы времени (t_ф) импульсов блока управления, выдаваемых на электропривод открывания или закрывания дроссельного устройства, с заданным временем (t₃) открывания или закрывания этого дроссельного устройства. Если t_ф оказывается больше t₃, то фиксируется отказ. Если t_ф<t₃, то устройство исправно и отказ не выдается.The criterion for device failure is a comparison of the actual amount of time (t _f ) of the pulses of the control unit issued to the electric drive for opening or closing the throttle device with a given time (t ₃ ) for opening or closing this throttle device. If t _f is greater than t ₃ , then a failure is recorded. If t _f <t ₃ , then the device is operational and a failure is not issued.

На чертеже изображена функциональная схема устройства. The drawing shows a functional diagram of the device.

Устройство содержит сборный коллектор 1, параллельно подключенные основную 2 и резервную 3 линии отбора, датчик 4 расхода воздуха, дроссельное устройство 5 с реверсивным электроприводом 6 и концевыми выключателями открытого 7 и закрытого 8 положения, блок 9 управления с встроенным устройством определения его отказа, первый 10, второй 11, третий 12 и четвертый 13 элементы И, первый 14, второй 15 и третий 16 элементы И-НЕ, первый 17, второй 18 и третий 19 RS-триггеры, первый 20 и второй 21 счетчики времени, генератор 22 счетных импульсов, блок 23 индикации, задатчик 24, первый 25 и второй 26 выходы блока управления. The device contains a prefabricated collector 1, parallel connected main 2 and backup 3 sampling lines, air flow sensor 4, throttle device 5 with reversible electric drive 6 and limit switches open 7 and closed 8 position, control unit 9 with an integrated device for determining its failure, the first 10 , second 11, third 12 and fourth 13 elements AND, first 14, second 15 and third 16 elements NAND, first 17, second 18 and third 19 RS-flip-flops, first 20 and second 21 time counters, generator 22 counting pulses, indication unit 23, setter 24, the first 25 and second 26 outputs of the control unit.

Устройство работает следующим образом. Если, например, количество воздуха, подаваемое через линию 2 отбора в сборный коллектор 1, меньше величины, установленной по задатчику 24, то в блоке 9 управления на первый выход 25 поступает или импульсами, или постоянно (в зависимости от величины отклонения регулируемого параметра от значения, установленного по задатчику) сигнал на открывание дроссельного устройства 5. Обозначим сигнал во время импульса или постоянно значением "1", во время паузы между импульсами или при отсутствии сигнала управления значением "0". The device operates as follows. If, for example, the amount of air supplied through the sampling line 2 to the collection manifold 1 is less than the value set by the control unit 24, then in the control unit 9, the first output 25 is supplied either by pulses or continuously (depending on the magnitude of the deviation of the adjustable parameter from the value set by the knob) signal to open the throttle device 5. Denote the signal during the pulse or constantly by the value "1", during the pause between pulses or in the absence of a control signal with the value "0".

Рассмотрим работу первого и второго каналов устройства в нескольких режимах работы. Consider the operation of the first and second channels of the device in several modes of operation.

1. Устройство исправно, идет регулирование на открывание дроссельного устройства 5. 1. The device is in good condition, regulation is underway to open the throttle device 5.

Выход 25 - 1 (открывание элемента 5). Exit 25 - 1 (opening element 5).

Выход 26 - 0 (сигнал не выдается). Output 26 - 0 (no signal is output).

2. Устройство неисправно, идет регулирование на открывание дроссельного устройства 5. 2. The device is malfunctioning, regulation is underway to open the throttle device 5.

Выход 25 - 1. Exit 25 - 1.

Выход 26 - 0. Exit 26 - 0.

3. Устройство исправно, идет регулирование на закрывание дроссельного устройства 5. 3. The device is in good condition, regulation is underway to close the throttle device 5.

Выход 25 - 0. Output 25 - 0.

Выход 26 - 1. Exit 26 - 1.

4. Устройство неисправно, идет регулирование на закрывание дроссельного устройства 5. 4. The device is malfunctioning, regulation is underway to close the throttle device 5.

Выход 25 - 0. Output 25 - 0.

Выход 26 - 1. Exit 26 - 1.

5. Устройство исправно или неисправно, регулирование не идет. 5. The device is working properly or malfunctioning; regulation is not going on.

Выход 25 - 0. Output 25 - 0.

Выход 26 - 0. Exit 26 - 0.

Принцип работы устройства заключается в следующем. При появлении информационного сигнала (в нашем случае "1") на любом из выходов блока 9 управления включается соответствующий счетчик времени. При этом на соответствующем входе блока 23 индикации поддерживается нулевой сигнал. Если при работе данного счетчика ранее времени окончания счета происходит замыкание концевого выключателя, то на соответствующий вход блока 23 индикации поступает сигнал "1", что информирует о положении данного выключателя при исправной работе устройства. The principle of operation of the device is as follows. When an information signal (in our case "1") appears at any of the outputs of the control unit 9, the corresponding time counter is turned on. In this case, a zero signal is supported at the corresponding input of the display unit 23. If during operation of this counter, before the end of the count, the limit switch closes, then the signal “1” is sent to the corresponding input of the display unit 23, which informs about the position of this switch when the device is operating properly.

Если по истечении времени, отведенного на анализ работы, не происходит замыкания концевого выключателя, то на третий вход блока 23 индикации поступает сигнал "1", который свидетельствует о неисправности устройства и включает резервную линию 3 отбора. If after the time allotted for the analysis of operation, the limit switch does not close, then the signal “1” is received at the third input of the display unit 23, which indicates a malfunction of the device and includes a standby selection line 3.

Если за время анализа работы происходит обнуление выходных сигналов блока 9 управления, то на всех входах блока 23 сохраняются сигналы "0", что соответствует исправной работе устройства. If during the analysis of the work the output signals of the control unit 9 are zeroed, then the signals “0” are stored at all inputs of the block 23, which corresponds to the proper operation of the device.

Claims

A device for supplying air, containing a main sampling line in which an air flow sensor and a throttle device are installed, kinematically connected with a reversible electric drive and limit switches of open and closed position, a control unit, the information input of which is connected to the output of the air flow sensor, the driving input is connected to the output of the setter, and the first and second outputs are connected to the corresponding windings of the reversible electric drive, the first and second time counters, the generator of counting pulses, display unit, first, second, third and fourth elements And, characterized in that, in order to increase reliability and expand the functionality of the device due to the ability to control the feed in a pulsed mode of operation, a collector with a backup sampling line connected to it is introduced, the first, second and third RS are triggers, the first, second and third elements AND are NOT, and the outputs of the first and second elements AND are connected to the S - inputs of the first and second RS - triggers, respectively, whose inverse outputs are connected to the first m inputs of the first and second elements AND - NOT, respectively, whose outputs are connected to the inputs of the prohibition of counting, respectively, of the first and second time counters, the outputs of which are connected to the second inputs of the first and second elements, respectively, AND - NOT, the first output of the control unit is connected to the first inputs of the first and of the third element And, to R - the input of the second RS - trigger and to S - the input of the third RS - trigger, the second output of the control unit is connected to the first inputs of the second and fourth elements And, to R - the inputs of the first and third RS - triggers, the first e terminals of the limit switches of the open and closed position of the throttle device are connected to the second inputs of the first and second I elements, respectively, and their second terminals are combined and connected to the device power bus, the output of the counting pulse generator is connected to the second inputs of the third and fourth I elements, the outputs of which are connected to the counting inputs, respectively, of the first and second time counters, the zeroing inputs of which are connected respectively to the direct and inverse outputs of the third RS - trigger, direct outputs The first and second RS-flip-flops are connected respectively to the first and second inputs of the display unit, the third input of which is connected to the input of the backup standby line connection and to the output of the third AND element - NOT, the first and second inputs of which are connected to the outputs of the first and second AND elements, respectively - NOT, the main sampling line is parallel to the reserve sampling line connected to the prefabricated collector.