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Shift control apparatus for continuously variable transmission

一种无级变速器、控制装置的技术，应用在传动装置控制、带有齿的元件、皮带/链条/齿轮等方向，能够解决驾驶者驾驶感不适感等问题，达到防止发动机转速增加、防止烦躁的效果

Active Publication Date: 2013-06-26
JATCO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, when the driver's accelerator operation is performed linearly to increase the engine speed by downshifting, depending on the running state of the vehicle, the driver may feel a so-called slippery feeling during the shifting operation of the continuously variable transmission or feel irritated by the increase in the engine speed. , the driver often has a sense of discomfort in driving

Method used

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  • Shift control apparatus for continuously variable transmission
  • Shift control apparatus for continuously variable transmission
  • Shift control apparatus for continuously variable transmission

Examples

Experimental program
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Effect test

Embodiment Construction

[0057] Next, an embodiment of the belt-type continuously variable transmission of the present invention will be described.

[0058] The belt-type continuously variable transmission 10 includes a primary pulley 11 , a secondary pulley 12 , a V-belt 13 , a CVT control unit 20 , and a hydraulic control unit 30 .

[0059] The primary pulley 11 is arranged coaxially with the engine 1 , and a hydraulic torque converter 2 and a forward and reverse switching mechanism 3 are arranged in sequence from the engine 1 side between the engine 1 and the primary pulley 11 .

[0060] The torque converter 2 includes a pump impeller 2 a connected to the output shaft of the engine 1 , a turbine 2 b connected to the input shaft of the forward and reverse switching mechanism 3 , a stator 2 c, and a lock-up clutch 2 d.

[0061] The forward / reverse switching mechanism 3 has a double pinion planetary gear set 3 a as its main component. The sun gear is combined with the turbine 2 b of the torque convert...

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PUM

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Abstract

A shift control apparatus for a continuously variable transmission includes: a target transmission gear ratio setting section (203) configured in a CVT control unit (20) making rotary driving force input to a primary belt wheel (11) in a continuous change and transmitting rotary driving force to the primary belt wheel (12) and configured to set a target transmission gear ratio with reference to a map based on an accelerator opening degree and a vehicle speed; a shift control section (205) configured to control a shift of the continuously variable transmission based on the target transmission gear ratio; and a downshift restricting section (206) configured to judge whether or not a restriction of the downshift is needed based on at least one of a variation amount (Delta To) of the accelerator opening degree and an accelerator depression speed, and to perform the restriction of the downshift when the downshift restricting section judges that the restriction of the downshift is needed, irrespective of a variation of the accelerator opening degree inputted to the target transmission gear ratio setting section (203).

Description

technical field [0001] The invention relates to a speed change control device of a continuously variable transmission. Background technique [0002] The continuously variable transmissions for vehicles include belt-type continuously variable transmissions and ring-type continuously variable transmissions. In any transmission, the speed ratio must be controlled according to the running state of the vehicle. [0003] For example, a belt-type continuously variable transmission includes a primary pulley, a secondary pulley, and a belt wound around the primary pulley and the secondary pulley. and at the same time, the rotational driving force (torque) of the engine input to the primary pulley is transmitted to the secondary pulley via the belt. [0004] A speed change control device for a continuously variable transmission includes a speed change map set based on simulations, experiments, etc., and executes speed change control based on a speed change line defined by the speed c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/662F16H61/02F16H61/18F16H59/66F16H59/48
CPCF16H2059/183F16H59/18F16H61/16F16H61/66259F16H61/6648F16H61/02F16H61/688
Inventor 可部智昭森藤伸彦市川启佑加藤信英小野雄己荻野启榊原幸伸中西久夫中田贵浩石塚光骑
Owner JATCO LTD
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