Abstract
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.
Highlights
A large number of freight vehicles and buses having the automated clutch control system (ACCS) with the electropneumatic actuator are produced nowadays
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
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 Pulse-Width Modulation (PWM) mode
Summary
A large number of freight vehicles and buses having the automated clutch control system (ACCS) with the electropneumatic actuator are produced nowadays. Electromagnetic valve durability requirements are much higher compared to the reliability of the actuator mechanics It is because of electropneumatic valve operating in pulse-width modulation mode to ensure the accuracy of the whole system operation. Kharkiv National Automobile and Highway University (KhNAHU) proposes the design of the ACCS actuator for the robotic transmission with only two control electropneumatic valves They ensure the good accuracy of their operation. The operation quality of the above-mentioned acceleration valve depends on both its design parameters and the parameters of electropneumatic valve control pulses that the electronic control unit (ECU) of ACCS generates This fact stipulates the necessity of rationalization of the control mode implemented by means of the ECU algorithm. The oscillograms illustrated the transitions in the ACCS actuator, use the following symbols: Xrod – the transition of an actuator rod, mm; pc – the pressure in a power chamber, MPa; pav – the pressure in an acceleration valve control chamber, MPa; tpulse – the time of an electropneumatic valve being under pressure, s; ∆Х – the inertial transition of an ACCS actuator rod, mm; a1, b1 – the position of an ACCS actuator rod during electropneumatic valve closing; a2, b2 – the stable position of an ACCS actuator rod after electropneumatic valve closing
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