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Engine control device for working vehicle

A technology for control devices and working vehicles, which is applied in the direction of control devices, engine control, transmission device control, etc., which can solve problems such as deterioration of workability and reduction of lifting force of lifting arm, and achieve the effect of improving workability

Active Publication Date: 2013-07-24
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, for example, in the case of shoveling with a wheel loader, if the driving force is large, when the bucket shovels into the soil, the reaction force acting on the lift arm becomes large, and the lift arm Reduced lifting force may lead to deterioration of workability

Method used

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  • Engine control device for working vehicle
  • Engine control device for working vehicle
  • Engine control device for working vehicle

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Experimental program
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Effect test

no. 1 approach

[0030] Below, refer to Figure 1 to Figure 9 A prime mover control device for a work vehicle according to a first embodiment of the present invention will be described.

[0031] figure 1 It is a side view of a wheel loader as an example of a work vehicle to which the prime mover control device of this embodiment is applied. The wheel loader 100 is composed of a front body 110 having an arm 111 , a bucket 112 , tires 113 and the like, and a rear body 120 having a cab 121 , an engine compartment 122 , tires 123 and the like. The arm 111 is rotated vertically (pitch motion) by the drive of the arm cylinder 114 , and the bucket 112 is rotated vertically (dumping or scooping) by the drive of the bucket cylinder 115 . The front body 110 and the rear body 120 are rotatably connected to each other by a center pin 101 , and the front body 110 is bent left and right relative to the rear body 120 by expansion and contraction of a steering cylinder (not shown).

[0032] figure 2 It i...

no. 3 approach

[0077] refer to Figure 14 ~ Figure 16 A prime mover control device for a work vehicle according to a third embodiment of the present invention will be described.

[0078] In the first and second embodiments described above, the maximum engine speed Nlim ( Figure 8 ), but in the third embodiment, the maximum engine speed is varied with time. In addition, differences from the first and second embodiments will be mainly described below.

[0079] In the third embodiment, by Figure 14 The running mode can be switched between the P mode and the L mode by operating the mode switching switch 190 shown. Figure 15 (a) and (b) are diagrams showing changes in the maximum engine speed Nlim in the P mode and the N mode, respectively. Such as Figure 15 As shown in (a), when the P mode is selected, the maximum engine speed Nlim is Np within the range of the predetermined time T1 or less (T≤T1), and is longer than the predetermined time T1 and within the range of the predetermined ti...

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Abstract

There are provided: a pedal operation amount detection unit 12 that detects an operation amount s of the accelerator pedal 11; a speed ratio detection unit 14, 15 that detects a speed ratio e of an input shaft and an output shaft of the torque converter 2; a load pressure detection unit 16 that detects a load pressure P of the hydraulic pump 6; a speed stage detection unit 18 that detects a low speed stage of a transmission 3 capable of varying a speed stage between a low speed stage and a high speed stage; and a speed limiting unit 10 that limits a maximum speed of the engine 1 to a lower speed upon satisfaction of following speed limitation conditions: at least a pedal operation amount s is equal to or greater than a predetermined value s1, a speed ratio e is equal to or less than a predetermined value ea, a load pressure P is equal to or greater than a predetermined value Pa, and the low speed stage of the transmission has been detected.

Description

technical field [0001] The present invention relates to a prime mover control device for work vehicles such as wheel loaders. Background technique [0002] Conventionally, there is known a device that changes the engine output torque characteristic according to mode selection of the workload mode and the fuel saving mode (for example, refer to Patent Document 1). In the device described in this patent document 1, when the fuel-saving mode is selected, the engine output torque in the high rotation range is set smaller than when the workload mode is selected, and the maximum pump absorption rotation speed is set accordingly. The moment is also set smaller. Thereby, a large traveling driving force can be obtained regardless of the mode selection. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2005-61322 [0004] However, for example, in the case of shoveling with a wheel loader, if the driving force is large, when the bucket shovels into the soil, the reaction for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D29/00E02F9/20E02F9/22F02D29/02F02D45/00
CPCF02D2200/501B60Y2200/415F02D2400/12B60W10/30F02D29/02B60W10/06F02D41/1497F02D41/0225B60W30/1882B60W2510/1005F02D2200/602F02D41/021F02D29/04E02F9/2296B60W2710/0644E02F9/2246B60W2540/103F16H2059/467
Inventor 兵藤幸次中园裕喜铃木伸洋岛津淳志吉川正规糸贺健太郎长南和夫高桥智雄
Owner NIHON KENKI CO LTD