Design, Construction and Evaluation of the control valve with capable of installing at the pump outlet of the MF 285 Tractor

Document Type : Research Paper

Authors

Department of Biosystems Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran.

Abstract

Abstract
The Control valve of the hydraulic pump of MF285 tractor is a sliding type and installed at the pump inlet. This causes the draft control system couldn't react on time to changes in soil conditions and consequently the tractive efficiency decreases. In this research a new control valve was designed and constructed that can be installed at the pump outlet, with electronic control capability and for use in the electro-hydraulic hitch control system. In order to ensure the correct operation of the control valve, the effects of two control valves (electronic and mechanical) under three engine speed(rpm) levels and three oil pressure levels on flow rate of the hydraulic pump were assessed by conducting a completely randomized design. The results showed that the effect of engine speed, oil pressure and their interaction were significant (P<0.01) but the effect of control valve type and its interactions with other treatments were not significant. At all pressure levels, the flow rate increased with increasing engine rpm. Also, a significant linear relationship was observed between the pump flow and engine speed. The results of transient response tests of electro-hydraulic control system to step input in raising and lowering positions showed that the control system followed the system input with a suitable speed. And after reaching the steady state, kept the height of the device in the range of the death zone (± 2 cm).

Keywords

References

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Agricultural Mechanization
Volume 6, Issue 4
January 2022
Pages 47-56

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History

  • Receive Date: 16 February 2022
  • Accept Date: 16 February 2022

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