7Īs for the design of a control system for automatic gear shifting, there are some achievements for ground vehicles, but only little dealing with gear shift for agricultural tractors are available.
The signal state tractor gear system manual#
As a result, Automatic gear shifting not only improves the quality and efficiency of field work but also reduces fuel and power loss caused by improper manual gear shifting operations.
The signal state tractor gear system driver#
It can free the driver from the frequent gear shift and make the driver focus more on the operation of the implements. 5, 6 Automatic gear shifting really can reduce driver work intensity for repetitive shifting operations.
4 Therefore, to improve work efficiency and reduce driving effort, power shift transmissions enabling the automatic shifting of gears are gradually proposed and used. What's more, tractors will stop unexpectedly because of inappropriate gear shift failing to transmit continuous power to the driving wheels. If manual gear shifting is adopted, repeated gear shifting will not only cause operator's discomfort because of its excessive limbs intervention but also reduce the life of clutch. Usually, tractors move on uneven soils at low speed but with large traction forces, so they are equipped with power shift transmission to ensure flexibility at each speed in different working conditions. 3 As we know, agricultural tractors have to cope with working conditions which are more complex and demanding than those experienced by other ground vehicles. 2 Automatic gear shifting is therefore one of the important development trends for agricultural tractors. 1 With the development of modern agriculture, tractors are rapidly developing towards automation and intellectualization. Furthermore, the response speed of MSMADRC is the fastest, it only takes about 0.7s.Īgricultural tractors can be used as a power source for various field operations and is regarded as one of the vital implement in farm mechanization and as a versatile machine both for agriculture and farmer. Lastly, the simulation results demonstrate that the position control precision by MSMADRC is higher 37% than by SMC and higher 75% than by ADRC. What's more, the stability of the control system is proved by Lyapunov theory. Secondly, a sliding mode surface instead of the nonlinear control law in the active disturbance rejection control (ADRC) algorithm is designed, which realizes the fast and accurate tracking of the position.
Then an extended observer is presented to monitor the unmodeled dynamics and various disturbances of the system in real time, at the same time the extended state and the system feedback variables are constructed as the system variables of the sliding mode control (SMC) algorithm. Firstly, the control model of the motor with total disturbance is established.
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