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Shift control device for working vehicle

A technology for working vehicles and control devices, applied in the directions of control devices, electrical control, vehicle components, etc., can solve the problems of vehicle speed change shocks and changes, and achieve the effect of smooth forward/backward switching

Active Publication Date: 2008-07-23
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Accompanied by this, the rotation speed of the turbine of the torque converter changes sharply and reverses, and the vehicle is prone to problems such as shifting shock.

Method used

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  • Shift control device for working vehicle
  • Shift control device for working vehicle
  • Shift control device for working vehicle

Examples

Experimental program
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Effect test

Embodiment Construction

[0018] Hereinafter, preferred embodiments of the shift control device for a work vehicle of the present invention will be described with reference to the accompanying drawings.

[0019] FIG. 1 is a system diagram for explaining a shift control device for a work vehicle according to an embodiment of the present invention. The shift control device includes a control device 1, an accelerator pedal 2, a forward / reverse switch lever 3, an engine rotation sensor 5, a transmission 6, a vehicle speed sensor 8, a transmission input rotation sensor 9, a torque converter 12, and the like.

[0020] The control device 1 acquires a detection signal of the accelerator pedal operation amount from the accelerator pedal 2 , and acquires a command signal for forward / reverse switching from the forward / reverse switching lever 3 . Then, the control device 1 obtains a detection signal of the engine speed from the engine rotation sensor 5 for detecting the speed of the output shaft 4 of the engine E,...

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PUM

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Abstract

The present invention provides a speed change control device for a work vehicle, which has a shifted automatic transmission, including: a control device for controlling the engine speed of the work vehicle and the shifted automatic transmission; a reverse switching instruction; and an operation amount detection device for detecting an operation amount of an accelerator pedal of the work vehicle. After the forward / reverse switching command is output by the forward / reverse switching component, the control device performs the forward / reverse switching control of the geared automatic transmission, and controls the engine speed to slowly decrease to the set target lower limit value, so that the change of the working vehicle The turbine of the torquer does not reverse.

Description

technical field [0001] The present invention relates to a shift control device for a work vehicle mounted with a range transmission. Background technique [0002] Some work vehicles such as wheel loaders are equipped with automatic transmissions with gears. As is well known, as a shift control device for such a work vehicle, when a forward / reverse switching operation is performed, braking is performed with a braking force corresponding to the operation amount of the accelerator pedal at the time of forward / reverse switching, and the throttle valve is closed to decelerate the vehicle speed. When the predetermined speed is reached, the forward / reverse gear of the automatic transmission is actually switched (refer to Patent Document 1). When the vehicle speed is further decelerated to substantially zero, the shift control device sets the opening degree of the throttle valve in accordance with the accelerator pedal operation amount. [0003] Patent Document 1: Japanese Patent ...

Claims

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Application Information

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IPC IPC(8): F02D29/00
CPCF02D29/02F02D31/001F02D2400/12F02D41/023Y10T477/68B60W2540/10B60W10/10B60W10/06B60W30/18045B60Y2200/41Y10T477/677B60W2710/0661B60W2540/16F02D29/00F02D45/00F16H59/44
Inventor 桧垣正美田中哲二仲山秀雄酒井荣一束田英信
Owner NIHON KENKI CO LTD