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Speed change control system for industrial vehicle

A technology for control devices and industrial vehicles, applied in transmission control, components with teeth, construction, etc., can solve problems such as increased driving load, and achieve the effect of easy parking

Active Publication Date: 2012-11-14
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the device described in Patent Document 1, when the brake is activated by operating the brake pedal during travel, the travel load increases, and the transmission may downshift to 1st speed.

Method used

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  • Speed change control system for industrial vehicle
  • Speed change control system for industrial vehicle
  • Speed change control system for industrial vehicle

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Experimental program
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Effect test

no. 1 approach

[0084] According to the first embodiment, the following effects can be achieved.

[0085] (1) When the accelerator pedal is depressed to the predetermined value A1 or more, the gear is shifted by the torque converter speed ratio reference control. At this time, even if the upshift condition that the torque converter speed ratio e is equal to or greater than the predetermined value eu is satisfied, upshifting is not performed unless the vehicle speed v becomes equal to or greater than the minimum vehicle speed (step S14, step S15). Thereby, the timing of upshifting can be delayed, and work can be performed while traveling at a low speed without operating the brake pedal 32 .

[0086] (2) The L mode and the H mode can be selected by the mode selection switch 7 , and the minimum vehicle speed in the L mode is set lower than the minimum vehicle speed in the H mode in the same speed stage. As a result, when the L mode is selected, upshifting can be performed without depressing the...

no. 2 approach

[0100] refer to Figure 9 ~ Figure 12 , the second embodiment of the speed change control device of the present invention will be described. In addition, differences from the first embodiment will be mainly described below.

[0101] In the first embodiment, it is possible to select the L mode and the H mode in which the minimum vehicle speed at the time of shifting is different among the torque converter speed ratio references, while in the second embodiment, it is possible to select the torque converter speed One of the ratio reference and the vehicle speed reference. That is, in the second embodiment, instead of the mode selection switch 7 for selecting the L / H mode, a running mode selection switch 7 is provided for selecting automatic shifting based on the torque converter speed ratio reference and automatic shifting based on the vehicle speed reference. One of the gears.

[0102] An example of the driving mode selection switch 7 of the second embodiment Figure 9 shown...

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Abstract

The invention provides a speed change control system comprising a speed ratio detecting unit for detecting the speed ratio between the input shaft and the output shaft of a torque converter, a torque converter speed ratio reference speed changing unit for shifting up or down the speed stage of a transmission in accordance with the speed ratio detected, a brake detecting unit for detecting the action of a running brake device, and a shiftdown limiting unit for permitting a shiftdown to a first speed by a speed change unit, when the action of the brake device is not detected by the brake detecting unit, but for limiting the minimum speed stage at a shiftdown time by the speed changing unit, to a second speed when the action of the brake device is detected.

Description

technical field [0001] The present invention relates to a speed change control device for industrial vehicles such as wheel loaders. Background technique [0002] Conventionally, there is known a device that transmits an output torque of an engine to a transmission through a torque converter (hereinafter referred to as a torque converter) (for example, refer to Patent Document 1). In the device described in this patent document 1, the torque converter speed ratio is calculated as the speed ratio between the input shaft side and the output shaft side of the torque converter, and when the speed ratio reaches a predetermined value, automatic to upshift or downshift the transmission. [0003] Patent Document 1: Japanese Patent No. 3388594 [0004] However, in the device described in Patent Document 1, when the brakes are actuated by operating the brake pedal during travel, the travel load increases, and the transmission may downshift to 1st speed. In this case, since the driv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/18E02F9/20F16H59/18F16H59/40F16H59/42F16H59/54F16H61/68
CPCF16H59/42E02F9/2025F16H59/18F16H2059/467F16H61/16F16H59/40F16H59/54E02F9/2253E02F9/2079E02F9/2083Y10T74/19284F16H61/18
Inventor 兵藤幸次田中哲二酒井荣一
Owner NIHON KENKI CO LTD