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The object of study is transmissions off-road vehicle. The purpose of the research is the creation of automated manual transmission (AMT) for all-terrain vehicles. The work describes the main technical characteristics of the vehicles, as well as units that are subject to automated control: friction clutch, gearbox and distributor box with electro-pneumatic actuators. It represents the stand for laboratory experimental studies of robotic mechanical transmissions and the results obtained on the test bench during the work of the transmission units in the automatic mode. The analyzed parameters when working at the test bench is the total time of gear-shifting, the clutch engagement and disengagement, time and magnitude of pressure increase in the transmission automatic control mechanism and power transmission control cylinder, time of synchronization, dynamic loads during gear shifting, the overall power losses in the work of transmission units and other parameters. It also shows the comparison of calculated data and experimental results obtained on the test bench and on the road. It represents conclusions and recommendations on creation of mechanical of multistage transmission with automatic control for off-road vehicle. Introduction Improving the technical level of modern vehicles, including all-terrain ones, is highly correlated with the degree of saturation of their units and systems with automatic devices based on microprocessor control. Microprocessor control provides improved performance of vehicles in many respects: technical, economical and ergonomic. Complexes with microprocessor control which is just a little more expensive than mechanical counterparts are, but by the aggregate measure price / quality is much superior to them. The transmissions of vehicles around the world most often have mechanical synchronized gearboxes with a friction clutch. These transmissions in comparison with typical automatic transmission have such advantages as small weight and size, high reliability and service life, low cost, high energy performance as well as ease of maintenance and repair. One of the main areas is the automation of mechanical gear transmission control, especially the control of a multi-stage gearbox and a clutch. The invention of microprocessors, capable of operating in harsh environments of all-terrain vehicles with high speed, allows not only to improve the accuracy of control, but also to increase the number of information parameters, thus realizing more flexible control logic. As a result, the automatic transmission control system leads to improved efficiency of the use of the engine power as well as traction and speed properties, it improves fuel efficiency and reduces the driver’s fatigue. In the work [1] the schemes and the general description of mechanical transmissions are presented, including with automated manual transmission (AMT), their advantages and disadvantages are described. It should be noted that at present AMT is widely used in vehicles, trucks, intercity buses and all-terrain vehicles. Overview of the types of actuators and control systems

Experimental Research of Automated Manual Transmissions for Off-road Vehicles