Abstract
The failure of a hydraulic system will affect the shifting quality and driving safety of a CVT tractor. In order to reveal the response of the tractor under different hydraulic system failures without destroying the transmission, the following methods are proposed in this paper: firstly, building the simulation model of CVT; secondly, building a test bench to test and verify the transmission model to ensure that the simulation model can accurately predict the response of CVT under different clutch oil pressures; thirdly, obtaining the fault oil pressure data without starting the engine and taking the data of fault oil pressure as the input variable of the simulation model; finally, obtaining the response of the CVT tractor under different hydraulic system failures by simulation. It is found that the damage of the seal ring inside the rotary joint has little effect on shifting quality; oil way block can lead to greater shift impact; when seal ring damage and oil way block occur together, the clutch cannot reach the minimum working pressure; clutch piston jamming and oil leak can cause power interruption of the tractor. The results show that it is feasible to study the response of CVT in fault mode by simulation.
Highlights
A tractor’s working conditions are complex, and it often needs more working gears
In order to evaluate the impact of hydraulic system failure on the shifting quality and driving impact of hydraulic system failure on the shifting quality and driving safety without damaging safety without damaging the tractor CVT, the following method is proposed in this paper: first, thethe oil tractor CVT, following method is under proposed in this paper: first, the oil pressure datawithout of the pressure data the of the transmission clutch different hydraulic system faults are obtained transmission clutch under different hydraulic aretoobtained starting the engine, starting the engine, and the response of system the CVTfaults tractor the faultwithout oil pressure is obtained by and the response of the tractor to the fault oil pressure is obtained by computer simulation
The separation of the clutch C1 would lead to the decrease of the tractor speed
Summary
A tractor’s working conditions are complex, and it often needs more working gears. For example, Foton Lovol’s P2654-N tractor and Changfa’s CFK2204 tractor have 40 forward gears and 40 reverse gears. The hydrostatic power split CVT is a complex mechanic-electronic-hydraulic integrated system, which requires high robustness and reliability for each subsystem [9,10,11]. The hydrostatic power split CVT is a complex mechanic-electronic-hydraulic integrated system, which requires high robustness and reliability eachthat subsystem. In order to evaluate the impact of hydraulic system failure on the shifting quality and driving impact of hydraulic system failure on the shifting quality and driving safety without damaging safety without damaging the tractor CVT, the following method is proposed in this paper: first, thethe oil tractor CVT, following method is under proposed in this paper: first, the oil pressure datawithout of the pressure data the of the transmission clutch different hydraulic system faults are obtained transmission clutch under different hydraulic aretoobtained starting the engine, starting the engine, and the response of system the CVTfaults tractor the faultwithout oil pressure is obtained by and the response of the tractor to the fault oil pressure is obtained by computer simulation
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