Prototyping a System for Truck Differential Lock Control

The article deals with the development of a mechatronic system for locking vehicle differentials. An important benefit of this system is that it prevents the jamming of the vehicle in difficult adhesion conditions. The system recognizes such a situation much sooner than the driver and is able to respond immediately, ensuring smooth driving in off-road or snowy conditions. This article describes the control algorithm of this mechatronic system, which is designed for firefighting, military, or civilian vehicles with a drivetrain configuration of up to 10 × 10, and also explains the input signal processing and the control of actuators. The main part of this article concerns prototype testing on a vehicle. The results are an evaluation of one of the many experiments and monitor the proper function of the developed mechatronic system.

The results of experimental studies of the force rolling resistance MEZ-330 “Autotractor”

Purpose. Determine the effect on the tire pressure of the wheels of the wheels and the condition of the wheelbase differential on the force of rolling resistance of the MEZ-330 “Autotractor”. Methods. The studies were conducted experimentally by measuring the force of rolling resistance of the MEZ-330 “Autotractor”. System analysis and methods of statistical processing of the obtained research results are used. Results. The prototype of the new mobile energy vehicle MEZ-330 “Autotractor” combines the characteristics of a truck and a tractor, which is used both on transport operations on solid roads and on traction and technological operations on the field. The MEZ-330 “Autotractor” has three drive bridges and tires with adjustable air pressure, so research into the force of rolling resistance for such mobile energy facilities is relevant and poorly researched. The paper presents the methodology for conducting experimental studies and presents the measuring and recording equipment for conducting the research. The researches were carried out with the prototype of the mobile power tool MEZ-330 “Autotractor”, which was developed by NSC “IАЕE” together with PJSC “AvtoKrAZ”. The studies were conducted on asphalt road and field. The test conditions and method meet the requirements of GOST 7057-2003. According to the results of experimental studies, a graphical dependence was constructed, which reflects the dependence of the rolling resistance of the tire pressure on the wheels of the wheels and the condition of the axial differential on the asphalt road and the field. Conclusions. According to the results of studies, it is found that moving the asphalt road reduces the air pressure in the tires of the wheels of the MEZ leads to an increase in the force of rolling resistance by 168%, and the field – to reduce the rolling resistance of the MEZ to 46%. When moving on paved roads, it is necessary to increase the air pressure in the tires of the wheels to reduce the rolling resistance and to avoid movement with a locked wheelbase. Moving on the field, it is necessary to reduce the air pressure in the tire wheels in proportion to the hardness of the ground and to use the interlocking differential lock to obtain high traction. Keywords: mobile power tool, motor tractor, rolling resistance, tire pressure, wheelbase, hysteresis.

Testing of the mechatronic robotic system of the differential lock control on a truck

This article deals with testing the algorithm developed for autonomous control lock of the differential in a truck. Hardware for hardware in the loop testing of robotic systems or automotive systems is used and the proposed control algorithm was implemented into it. The system was applied to a vehicle with 8 × 8 drive and control algorithm evaluates input sensor values to set robotic console control. It is an actuator which consists of electrovalve, pneumatic cylinder, console, special dog clutch and feedback limit switch. This robotic console is used to lock the truck differentials. Verification of the correct algorithm operation was performed by manoeuvres and the response of the whole system was monitored. The aim was to get the reaction times of this mechatronic robotic system and evaluate them.

ДОСЛІДЖЕННЯ НАВАНТАЖЕНОСТІ ТА ЕКСПЛУАТАЦІЙНИХ РЕЖИМІВ ТРАНСМІСІЇ ТРАКТОРА КЛАСУ 14 КН З СИСТЕМОЮ МІЖКОЛІСНОГО АВТОБЛОКУВАННЯ

Представлені результати експериментального дослідження роботи орного аґреґату у складі трактора МТЗ-80 з навісним плугом ПН-3-35 на супіщаному ґрунті в Білорусії у випадку диференціального та блокованого міжколісного приводу заднього моста у режимі розгону із заглибленням плуга на ходу та з попередньо заглибленим плугом. За допомогою тензометричних датчиків замірялись обертові моменти на валу зчеплення та півосях заднього моста трактора. В результаті аналізу середніх та пікових значень моментів встановлено, що в разі блокованого приводу сумарні моменти на півосях були на 5,9–31,3 % більші, ніж за диференціального приводу. Більш навантаженою на усіх режимах випробувань була права піввісь. Максимальні моменти на ній були більші, ніж на лівій на 4,6–20,3 % у разі вимкненої блокіровки і 12,1–32,5 % за ввімкненої. Виконані розрахунки на міцність півосей трактора за піковими та середніми навантаженнями. Дослідження навантажень на опори підшипників первинного та вторинного валів коробки передач трактора не виявили значного впливу блокування диференціала на ці навантаження. The results of experimental research work as part of an arable unit MTZ-80 with mounted plow PN-3-35 on sandy loam soil in Belarus in the differential and locked rear axle of cross-axle drive in acceleration mode with a deep plow on the go and pre-recessed plow. Using strain gauges, the torque on the clutch shaft and the axles of the tractor rear axle. An analysis of average and peak values ​​of moments we found that when a blocked drive total points on the semi-axes were 5,9–31,3 % more than the differential drive. Over-loaded on all test conditions was the right half. Maximum points on it were greater than on the left on 4,6–20,3 % at lock off and 12,1–32,5 % when enabled. The calculations of the strength of the semi-axes tractor for peak and average load were completed. Research loads on the primary and secondary shafts of the tractor gearbox bearing blocks have not found a significant effect of the differential lock on the load.