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Continuously variable transmission and shift control method thereof

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 driver's discomfort and other problems, and achieve the effect of preventing discomfort

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

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that there is a difference in the shift responsiveness between the shift by only the shift mechanism and the shift by the shift mechanism and subtransmission mechanism, and the driver feels uncomfortable.

Method used

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

Examples

Experimental program
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Embodiment Construction

[0041] 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.

[0042] figure 1 It is a schematic configuration diagram of a vehicle equipped with the continuously variable transmission of the present embodiment. This vehicle has an engine 1 as a drive source. The output rotation of the engine 1 is transmitted to the drive wheels through the torque converter 2 with a lock-up clutch, the first gear set 3, the continuously variable transmission (hereinafter referred to as "transmission 4"), the second gear set 5, and the final reducti...

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Abstract

The present invention provides a continuously variable transmission and shift control method thereof, which can not bring uncomfortable feel to drivers through the transmission in a manual mode. The transmission controller (12) executes a control to cause the through speed ratio to follow the final through speed ratio by changing only the speed ratio of the variator (20) if a shift instruction is given from the driver a plurality of times in a row when the manual mode is selected, and advances the start of a change in the speed ratio of the sub-transmission mechanism (30) or accelerates the progression of the change of the speed ratio as compared with the case where the manual mode is not selected when the speed ratio of the variator (20) is maximized or minimized and the through speed ratio cannot follow the final through speed ratio.

Description

technical field [0001] The present invention relates to shift control in a manual mode of a continuously variable transmission provided with an auxiliary transmission. Background technique [0002] There is known a continuously variable transmission having a continuously variable transmission mechanism (transmission mechanism) and an auxiliary transmission mechanism selectively switching between a plurality of forward speed stages. In such a transmission, compared with a continuously variable transmission composed of only a transmission mechanism, the transmission range can be enlarged by the auxiliary transmission mechanism, so that the efficiency of the engine can be improved and the fuel consumption can be improved. [0003] In such a transmission, when performing shifting accompanied by shifting of the subtransmission mechanism, the variator is shifted in the opposite direction to the shifting direction of the subtransmission mechanism when the subtransmission mechanism ...

Claims

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Application Information

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IPC IPC(8): F16H61/04F16H61/06
CPCF16H61/66259F16H37/022F16H61/70F16H2061/6616F16H2037/023F16H61/02F16H61/04
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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