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Hydraulic drive control device

A technology of oil pressure and oil pressure circuit, which is applied in the direction of fluid pressure actuation device, engine control, fluid pressure actuation system components, etc. It can solve the problem of increasing the amount of oil sprayed by the oil pump, the user cannot truly feel it, and the increase in workload etc. to achieve the effect of reducing oil pressure loss, reducing fuel consumption, and reducing required load

Inactive Publication Date: 2008-03-19
KOMATSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the above-mentioned conventional technologies, since the output of the oil pump is controlled to be constant, if the oil pressure loss is reduced, the amount of oil discharged from the oil pump will be increased, thereby increasing the workload.
In this way, although by increasing the amount of work, the fuel consumption per job can be reduced and a good effect can be obtained, but on the other hand, there will be a problem that the user cannot truly feel the effect.

Method used

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no. 1 Embodiment approach

[0031] FIG. 1 shows a side view of a hydraulic excavator according to one embodiment of the present invention. In addition, FIG. 2 shows a hydraulic circuit diagram of the hydraulic drive control device according to the first embodiment.

[0032] The hydraulic excavator 1 of the present embodiment, as shown in FIG. The cab 5 is provided at the front left position, and the work implement 6 is attached at the central position of the upper swing body 4 . The working machine 6 is respectively connected to the boom 7, the boom 8 and the bucket 9 in sequence from the side of the upper swing body 4, and corresponding to the boom 7, the boom 8 and the bucket 9 respectively, an oil cylinder (lifting Arm oil cylinder 10, cantilever oil cylinder 11, bucket oil cylinder 12).

[0033] The hydraulic drive control device 15 included in the hydraulic excavator 2, as shown in FIG. Agency18.

[0034] The engine 16 is provided with a fuel injection device 19 including an electronic regulator...

no. 2 Embodiment approach

[0047] Next, a second embodiment of the hydraulic drive control device according to the present invention will be described below with reference to the hydraulic circuit diagram of FIG. 4 . In addition, in this embodiment, the same code|symbol is attached|subjected to the same member as the said 1st Embodiment, and the detailed description is abbreviate|omitted. Moreover, the hydraulic circuit diagram shown in FIG. 4 shows that the first hydraulic circuit part and the second hydraulic circuit part described later are connected (combined), and the boom cylinder 11 and the bucket cylinder 12 are extended, thereby The loop state when performing boom digging and bucket digging.

[0048] The hydraulic drive control device 60 of this embodiment has: the first hydraulic circuit part 61 that mainly drives the boom oil cylinder 11 by using the pressure oil discharged from the first oil pump 17A of the variable capacity type; The pressure oil discharged from the second oil pump 17B mai...

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Abstract

A hydraulic drive control device capable of transforming a hydraulic pressure loss reduction effect to a fuel consumption reduction effect that can be most easily realized by a user. A hydraulic drive control device has a drive hydraulic circuit and a quick return circuit (42). The drive hydraulic circuit drives a hydraulic actuator (11) by charging and discharging pressurized oil discharged from a hydraulic pump (17) driven by an engine (16) to and from the hydraulic actuator (11) through control valves (22, 25). The quick return circuit (42) directly re-circulates a part of hydraulic oil discharged from the hydraulic actuator (11) to a tank (38) as the actuator (11) is driven. Engine control means (21) for controlling output of the engine (16) is provided, and the engine control means (21) suppress the output of the engine (16) when the quick return circuit (42) is opened.

Description

[0001] The present invention is a divisional application of the application number 200480023647.0 filed by the applicant Komatsu Manufacturing Co., Ltd. on August 9, 2004, and the title of the invention is "Oil Pressure Drive Control Device". technical field [0002] The present invention relates to a hydraulic drive control device for controlling a hydraulic drive system of, for example, a hydraulic excavator. Background technique [0003] Generally, a hydraulic excavator has a variable-capacity oil pump driven by an engine. By using a control valve to supply and discharge the pressure oil ejected from the oil pump to various hydraulic actuators, it is possible to separately drive and control the working machine, the swing device, and the hydraulic excavator. driving gear. In this hydraulic excavator, in order to match the output torque characteristics of the engine with the absorption torque characteristics of the oil pump, for example, where the fuel consumption efficienc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B11/00E02F9/22F15B11/024F15B11/17F15B21/14
CPCF15B2211/6651F15B2211/71F15B2211/20523F15B2211/55F15B2211/41581E02F9/2285F15B2211/6355F15B11/024F15B2211/6309F15B2211/3058F15B2211/20576F15B2211/88F15B2211/6313E02F9/2228F15B2211/30525F15B2211/30505F15B2211/46F15B2211/31576E02F9/2296F15B2211/3056F15B2211/3111F15B2211/428F15B2211/7114F15B21/14F15B2211/329E02F9/2246F15B2211/20546E02F9/2292E02F9/2225E02F9/2235F15B2211/40515F15B11/17E02F9/2242F02D29/04F15B11/00E02F9/22
Inventor 泽田洋
Owner KOMATSU LTD