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Mechanical diagram of the tested gearbox 

Mechanical diagram of the tested gearbox 

Source publication
Fig. 1. Mechanical diagram of the tested gearbox 
Fig. 2. Circuit diagram of an electro-hydraulic controller responsible...
Fig. 3. Overview of maps for the output pulley 
Fig. 5. The effect of temperature on the oil pressure in the actuator...
+6 Fig. 6. The magnetic force as a function of the average current for...
Generating the pressure to control the gear ratio of a continuously variable transmission in a car
Article
Full-text available
  • Dec 2016
Continuously variable transmission used in gearboxes allows to reduce the driver's participation in the process of controlling the drive system while driving by using automatic gear ratio control, and due to its flexibility, enables the internal combustion engine to operate in the area of its greatest efficiency. Moreover, it can be used in hybrid...
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Contexts in source publication

Context 1
... this solution the output pulley unit was responsible for the belt tension, and the input pulley unit was responsible for shifting gears. The tested gearbox diagram is shown in Figure 1. The test focused on creating characteristics for controlling the pressure in pulley actuators and gear ratios, and examining the interfering signals affecting the process of generating pressure and gear ratios. ...
Context 2
... plane cross-sections of the constant gear ratio, which shows that for an unloaded gearbox, the gear ratio approximately depends only on the pressure ratio. Diagram shift shown in Figure 9 results from the operation of the spring located in the chamber of the output pulley actuator, shown in the diagram in Figure 1. The last stage of the study was to check the effect of the torque transmitted through the gearbox on the process of generating the specified gear ratio. ...
Context 3
... M input -Input torque Tests were performed for the constant pressure P2 = 40 bar (minimal risk of slippage) with the input speed of n = 2000 RPM and the oil temperature T = 40 °C. The results are presented in Figure 10. ...

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Citations

... Consequently, the input pulley is generally considered to be responsible for the transition. For this reason, in the tests of the continuously variable transmissions, the pressure P2 is most often set constant, changing the ratio by pressure P1 [11]. ...
Verification of a method for determining the limit pressure peak in a mechanical continuously variable transmission
Article
Full-text available
  • Dec 2018
This research concerns the continuously variable transmission that is to be used in a hybrid drivetrain with a mechanical energy accumulator as a secondary energy source. The purpose of this research is to verify the method of determining the pressure surge which ensures a fast but safe ratio change, from the perspective of the belt slip point of a continuously variable transmission. The obtained results allowed to decide on the design of a more extensive test bench enabling simulation of the load of a continuously variable transmission resulting from the acceleration and braking of the car's mass. In addition, the test results confirmed the possibility of regulating the pressures in two actuators to change the ratio and increase the speed of this change.
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