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Continuously variable transmission and shift control method

A technology of continuously variable transmission and control method, applied in the direction of transmission control, elements with teeth, belt/chain/gear, etc., can solve the problems of driver discomfort, difference in speed change response, etc., and achieve fast speed change response, The effect of suppressing discomfort

Active Publication Date: 2012-04-04
JATCO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the shift responsiveness differs between the shifting of the variator only and the shifting of the sub-transmission mechanism, and the driver feels uncomfortable.

Method used

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  • Continuously variable transmission and shift control method
  • Continuously variable transmission and shift control method
  • Continuously variable transmission and shift control method

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Embodiment Construction

[0040] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in the following description, the "gear ratio" of a certain transmission mechanism is the value which divided the input rotation speed of the said transmission mechanism by the output rotation speed of the said transmission mechanism. In addition, the "lowest gear ratio" means the maximum gear ratio of the variator, and the "highest gear ratio" means the minimum gear ratio of the variator.

[0041] figure 1 It is a schematic configuration diagram of a vehicle equipped with a continuously variable transmission according to the present embodiment. The vehicle has an engine 1 as a power source. The output rotation of the engine 1 is transmitted to drive wheel 7. The second gear set 5 is provided with a parking mechanism 8 that locks the output shaft of the transmission 4 so that it cannot mechanically rotate when parking.

[0042] In addition, the vehicle i...

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Abstract

The present invention provides a continuously variable transmission and a shift control method, so as to prevent a shift in a manual mode from giving a sense of incongruity to a driver. In the continuously variable transmission with a variator (20) and a sub-transmission mechanism (30) connected, the shift control unit shifts the sub-transmission mechanism (30) while changing the speed ratio of the variator (20) in response to a change in the speed ratio of the sub-transmission mechanism (30) so that the through speed ratio does not change after the through speed ratio is caused to reach the final through speed ratio by changing only the speed ratio of the variator (20) if the speed ratio corresponding to the shift instruction from the driver is between a first speed ratio and a second speed ratio when the manual mode is selected.

Description

technical field [0001] The invention relates to a manual mode shift control of a continuously variable transmission equipped with a speed change mechanism and an auxiliary speed change mechanism. Background technique [0002] A transmission having a continuously variable transmission mechanism (transmission mechanism) and an auxiliary transmission mechanism selectively switching to a plurality of forward speed stages is known. In this type of transmission, compared with a normal continuously variable transmission, since the shift range can be enlarged by the auxiliary transmission mechanism, the efficiency of the engine can be improved and the fuel consumption rate can be improved. [0003] In this type of transmission, when performing shifting accompanied by shifting of the subtransmission mechanism, when the subtransmission mechanism starts shifting, the variator is shifted to the side opposite to the shift direction of the subtransmission mechanism. As a result, since th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/04F16H61/06
CPCF16H61/66259F16H37/022F16H2061/6615F16H2037/023F16H2061/6617F16H61/702F16H61/66F16H61/662
Inventor 井上真美子田中宽康伊藤昌秀森真人江口岳野野村良辅高桥诚一郎
Owner JATCO LTD
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