Abstract
A wet clutch is the key component to realize power uninterrupted in agricultural machinery operation. To reduce impact of the system and improve engagement quality, this paper studies and establishes the dynamic load characteristics model of a wet clutch and analyzes three kinds of tractor working conditions. This paper proposes and adopts the method of combining ‘PLS analysis-Improved SA—Comparison of various models-Actual test data’. The results show that with the limit of 100 Nm, the relationship between dynamic load characteristics and oil pressure is opposite. Load is highly inversely correlated with dynamic load, and it has enough precision to build a power curve model only by load (MAPE is 4.5929%). Take a certain type of tractor for example, oil pressure should be maintained at a low level, plowing resistance should be greater than 1600 N and the mass of transportation should avoid 600~1800 kg. This study provides a direct basis for the control, design and performance improvement of agricultural machinery.
Highlights
Agricultural machinery faces bad working environment and variable load conditions
When the engine type is determined, the power performance and economic performance of agricultural machinery are mainly determined by the transmission ratio of the power transmission system
When the variable gear number of the transmission system is small, the engine is more difficult to work within the operating range of power or economy
Summary
Agricultural machinery faces bad working environment and variable load conditions. When the engine type is determined, the power performance and economic performance of agricultural machinery are mainly determined by the transmission ratio (the gear number) of the power transmission system. In addition to the above, the research results in references [17,18,19,20,21,22,23] show that engine speed, load, oil pressure and flow rate have an impact on the variation characteristics of output torque in the wet clutch engagement process (the dynamic load characteristics are affected). Combined with these studies, the influence of load and oil pressure on dynamic load is relatively greater. The clutch engagement is controlled by the valve with a certain oil pressure or flow rate (the final stable oil pressure of the hydraulic system is regulated by the electromagnetic relief valve, and the flow rate of the hydraulic system at work is regulated by the proportional directional valve)
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