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Continuously variable transmission and controlling method thereof

A continuously variable transmission, belt-type continuously variable transmission technology, applied in transmission control, elements with teeth, belts/chains/gears, etc. The effect of reducing defects and preventing deterioration of operability

Active Publication Date: 2010-09-29
JATCO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in the structure in which the subtransmission mechanism is shifted on the condition of straddling a specific through speed ratio, if the through speed ratio changes near the specific through speed ratio, the subtransmission mechanism will be frequently shifted. There may be a reduction in running performance due to repeated shift shocks, or a reduction in the durability of the frictional coupling elements constituting the auxiliary transmission mechanism

Method used

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  • Continuously variable transmission and controlling method thereof
  • Continuously variable transmission and controlling method thereof
  • Continuously variable transmission and controlling method thereof

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Embodiment Construction

[0023] 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 variator is a value obtained by dividing the input rotational speed of the variator by the output rotational speed of the variator. In addition, the "lowest (Low) speed change ratio" is the maximum speed change ratio of the said transmission mechanism, and the "most (High) high speed speed change ratio" is the minimum speed change ratio of the said speed change mechanism.

[0024] 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 is transmitted to drive wheels 7 via a torque converter 2 , a first gear set 3 , a continuously variable transmission (hereinafter simply referred to as “transmission 4 ”), a sec...

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Abstract

The present invention provides a continuously variable transmission and controlling method thereof which optimizes a gear position condition of a subtransmission mechanism and prevents transmission of the subtransmission mechanism. When an accelerator pedal has been depressed to or above a predetermined opening, a transmission controller (12) permits a 2-1 shift, in which a gear position of the subtransmission mechanism (30) is changed from a second speed to a first speed. The gear position of the subtransmission mechanism (30) is changed from the second speed to the first speed when an actual through speed ratio passes a mode switch line from a High side to a Low side while the 2-1 shift is permitted in the subtransmission mechanism (30).

Description

technical field [0001] The present invention relates to a continuously variable transmission and a control method thereof, in particular to a continuously variable transmission equipped with a belt-type continuously variable transmission mechanism and an auxiliary transmission mechanism and a control method thereof. Background technique [0002] Patent Document 1 discloses a continuously variable transmission, which is configured by providing a two-stage forward sub-transmission mechanism in series with a belt-type continuously variable transmission mechanism (hereinafter referred to as "variator"), and changing the sub-transmission mechanism according to the running state of the vehicle. The transmission stage of the mechanism can thereby expand the variable transmission ratio range without enlarging the converter. [0003] Patent Document 1: (Japanese) Unexamined Patent Publication No. 60-37455 [0004] In such a continuously variable transmission with an auxiliary transm...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/66F16H61/04
CPCF16H61/66259F16H37/022F16H2059/183F16H61/0213F16H2037/023F16H61/702F16H37/02F16H61/00F16H61/04F16H61/66F16H61/662F16H61/70
Inventor 井上真美子城崎建机铃木英明野野村良辅高桥诚一郎落合辰夫古闲雅人内田正明门野亮路
Owner JATCO LTD
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