ОСОБЕННОСТИ УПРАВЛЕНИЯ ЭЛЕКТРОПНЕВМАТИЧЕСКИМИ КЛАПАНАМИ ИСПОЛНИТЕЛЬНОГО МЕХАНИЗМА УПРАВЛЕНИЯ СЦЕПЛЕНИЕМ С УСКОРИТЕЛЬНЫМ КЛАПАНОМ

The article deals with one of the ways to control an actuator of the automated clutch control system. The aim is to design control of the electropneumatic actuator, to control its coupling with the acceleration valve on the basis of experimental research as well as to provide rational parameters of the automated clutch control system for the robotic transmission. The feature of the system is an acceleration valve in the design of the electropneumatic actuator to control the clutch. New links demand to adjust the way to control the actuator. The connection of Pulse-Width Modulation (PWM) with single power supply pulses to control electropneumatic valves is substantiated. The quantitative characteristics of single control pulses and PWM ones are determined. The error of operation accuracy for various ways of the control of the electropneumatic actuator to control the clutch of the robotic transmission is determined. Obtained separate PWM area is designed to suppress the initial hysteresis when the rod of the clutch actuator is moved. An algorithm for the operation of a clutch control system is proposed, taking into account the use of two modes of operation of solenoid valves. A graphical interpretation of the clutch control algorithm is presented, which gives an idea of the location of the constant signal feeding zones to the solenoid valve, as well as the operation areas of the solenoid valve in PWM mode. The control algorithm of the clutch booster provides a mode of guaranteed absence of excess pressure in the pneumatic cylinder after releasing the clutch pedal, provided that two normally closed solenoid valves are used. This configuration of the electro-pneumatic clutch control system allows the use of an emergency clutch release system in case of voltage absence. The reference algorithm for filtering the array of data coming from the feedback sensor, as well as the numerical values of the delay caused by the presence of a filter, are given.В статье рассмотрен один из способов управления исполнительным механизмом автоматизированной системы управления сцеплением. На основе экспериментальных исследований предложены способ управления электропневматическим исполнительным устройством управления сцеплением с ускорительным клапаном, а также рациональные параметры автоматизированной системы управления сцеплением для роботизированной трансмиссии. Особенностью рассматриваемой системы является наличие в конструкции электропневматического исполнительного механизма управления сцеплением ускорительного клапана. Наличие новых связей требует корректировки способа управления исполнительным механизмом. Обосновано объединение широтно-импульсной модуляции с одиночными импульсами питания для управления электропневматическими клапанами. Определены количественные характеристики управляющих импульсов как для случая одиночных, так и в случае использования широтно-импульсной модуляции. Определена ошибка точности работы во время разных способов управления электропневматическим исполнительным устройством управления сцеплением роботизированной трансмиссии. Выделена отдельная зона широтно-импульсной модуляции, предназначенная для подавления начального гистерезиса при перемещении штока исполнительного устройства управления сцеплением. Предложен алгоритм работы системы управления сцеплением с учетом использования двух режимов работы электромагнитных клапанов. Представлена графическая интерпретация алгоритма управления сцеплением, дающая представление о расположении зон подачи постоянного сигнала на электромагнитный клапан, а также зон работы электромагнитного клапана в режиме широтно-импульсной модуляции. В алгоритме управления усилителем предусмотрен режим гарантированного сброса давления из пневматического цилиндра после отпускания педали сцепления при условии использования двух нормально закрытых электромагнитных клапанов. Такая конфигурация электропневматической системы управления сцеплением позволяет задействовать систему аварийного выключения сцепления при отсутствии электропитания. Приведены опорный алгоритм фильтрации массива данных, поступающих от датчика обратной связи, а также численные значения запаздывания, вызванного наличием фильтра

Experimental investigation of destruction of underwater bariers under the influence of extreme wave processes

The laboratory experiments of the deformations of the underwater barriers at step of the extreme waves were conducted. Some relations connecting the volume of deformation of underwater obstacles with the wave parameters and flow dynamics parameters are obtained

Особенности управления электропневматическими клапанами исполнительного механизма управления сцеплением с ускорительным клапаном

The article deals with one of the ways to control an actuator of the automated clutch control system. The aim is to design control of the electropneumatic actuator, to control its coupling with the acceleration valve on the basis of experimental research as well as to provide rational parameters of the automated clutch control system for the robotic transmission. The feature of the system is an acceleration valve in the design of the electropneumatic actuator to control the clutch. New links demand to adjust the way to control the actuator. The connection of Pulse-Width Modulation (PWM) with single power supply pulses to control electropneumatic valves is substantiated. The quantitative characteristics of single control pulses and PWM ones are determined. The error of operation accuracy for various ways of the control of the electropneumatic actuator to control the clutch of the robotic transmission is determined. Obtained separate PWM area is designed to suppress the initial hysteresis when the rod of the clutch actuator is moved. An algorithm for the operation of a clutch control system is proposed, taking into account the use of two modes of operation of solenoid valves. A graphical interpretation of the clutch control algorithm is presented, which gives an idea of the location of the constant signal feeding zones to the solenoid valve, as well as the operation areas of the solenoid valve in PWM mode. The control algorithm of the clutch booster provides a mode of guaranteed absence of excess pressure in the pneumatic cylinder after releasing the clutch pedal, provided that two normally closed solenoid valves are used. This configuration of the electro-pneumatic clutch control system allows the use of an emergency clutch release system in case of voltage absence. The reference algorithm for filtering the array of data coming from the feedback sensor, as well as the numerical values of the delay caused by the presence of a filter, are given

Особенности управления электропневматическими клапанами исполнительного механизма управления сцеплением с ускорительным клапаном

The article deals with one of the ways to control an actuator of the automated clutch control system. The aim is to design control of the electropneumatic actuator, to control its coupling with the acceleration valve on the basis of experimental research as well as to provide rational parameters of the automated clutch control system for the robotic transmission. The feature of the system is an acceleration valve in the design of the electropneumatic actuator to control the clutch. New links demand to adjust the way to control the actuator. The connection of Pulse-Width Modulation (PWM) with single power supply pulses to control electropneumatic valves is substantiated. The quantitative characteristics of single control pulses and PWM ones are determined. The error of operation accuracy for various ways of the control of the electropneumatic actuator to control the clutch of the robotic transmission is determined. Obtained separate PWM area is designed to suppress the initial hysteresis when the rod of the clutch actuator is moved. An algorithm for the operation of a clutch control system is proposed, taking into account the use of two modes of operation of solenoid valves. A graphical interpretation of the clutch control algorithm is presented, which gives an idea of the location of the constant signal feeding zones to the solenoid valve, as well as the operation areas of the solenoid valve in PWM mode. The control algorithm of the clutch booster provides a mode of guaranteed absence of excess pressure in the pneumatic cylinder after releasing the clutch pedal, provided that two normally closed solenoid valves are used. This configuration of the electro-pneumatic clutch control system allows the use of an emergency clutch release system in case of voltage absence. The reference algorithm for filtering the array of data coming from the feedback sensor, as well as the numerical values of the delay caused by the presence of a filter, are given

Tribological Properties of Ti-TiC Composite Coatings on Titanium Alloys

The application of titanium and its alloys under friction conditions is severely restricted, owing to their poor wear resistance. The paper presents the results of studies of the composition, microstructure, and tribological properties of Ti-TiC-based composite coatings formed on titanium alloys by the electroarc treatment in an aqueous electrolyte using a graphite anode. It has been found that TiC grains have a different stoichiometry and do not contain oxygen. The grain size varies from hundreds of nanometers to tens of micrometers, and the micro-hardness of the treated surface reached the value of 29.5 GPa. The wear resistance of the treated surface increased approximately 40-fold, and the friction coefficient with steel decreased to 0.08–0.3 depending on the friction conditions. The formation of a composite material based on Ti-TiC will contribute to the effective protection of titanium alloys from frictional loads in engineering