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Continuously variable transmission and control method thereof

A technology of a continuously variable transmission and a control method, which are applied in the direction of control device, transmission device control, climate sustainability, etc., to achieve the effect of improving fuel consumption rate and suppressing discomfort

Inactive Publication Date: 2010-03-31
JATCO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the change condition of the shift position of the auxiliary transmission mechanism in the above-mentioned prior art is not aimed at improving the fuel consumption rate, and there is still room for improvement from the viewpoint of improving the fuel consumption rate.

Method used

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

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Embodiment Construction

[0032] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in the following description, the "speed ratio" of a certain speed change mechanism is a value obtained by dividing the input speed of the speed change mechanism by the output speed of the speed change mechanism. In addition, the "lowest gear ratio" refers to the maximum gear ratio of the transmission mechanism, and the "highest gear ratio" refers to the minimum gear ratio of the transmission mechanism.

[0033] figure 1 It is a schematic configuration diagram of a vehicle equipped with a continuously variable transmission according to an embodiment of the present invention. This vehicle includes an engine 1 as a power source. The output rotation of the engine 1 passes through a torque converter with a lock-up clutch 2, a first gear set 3, a continuously variable transmission (hereinafter referred to as "transmission 4"), a second gear set 5, and a differentia...

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Abstract

When a through speed ratio, which is an overall speed ratio of a variator (20) and a subtransmission mechanism (30), varies from a larger speed ratio than a mode switch speed ratio to a smaller speedratio than the mode switch speed ratio, a gear position of the subtransmission mechanism (30) is changed from a first gear position to a second gear position and the speed ratio of the variator (20) is modified to a large speed ratio side by a transmission control mechanism (transmission controller 12 and hydraulic control circuit 11). The mode switch speed ratio is set to be equal to a high speedmode lowest speed ratio.

Description

Technical field [0001] The invention relates to a continuously variable transmission and a speed change control method thereof, in particular to a continuously variable transmission, which is provided with a belt type continuously variable transmission mechanism and an auxiliary transmission mechanism. Background technique [0002] A belt-type continuously variable transmission (hereinafter referred to as "CVT") is a transmission that has a pair of pulleys with variable groove widths and a belt wound between the pulleys. The groove widths of the pulleys can be changed individually. The gear ratio is continuously changed. A vehicle equipped with a CVT can use the engine under more effective and good operating conditions than an existing vehicle equipped with a stepped transmission, and it is expected that the vehicle's power and fuel consumption can be improved. [0003] In order to further improve the power and fuel consumption of a vehicle equipped with a CVT, it is desirable to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H37/02
CPCF16H61/70F16H37/022F16H61/66259Y02T10/76F16H2037/023F16H2061/6614F16H2037/025F16H61/662F16H61/66B60K17/06
Inventor 铃木英明野野村良辅田中宽康井上拓市郎井上真美子
Owner JATCO LTD
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