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work machinery

A technology for working machines and engines, applied in motor vehicles, mechanically driven excavators/dredgers, earthmovers/shovels, etc. The effect of suppressing sudden changes

Active Publication Date: 2018-08-28
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of the conventional technology disclosed in Patent Document 1, not only the state of the power storage device that supplies electric power to the motor generator is not monitored, but also the hydraulic pump is not controlled.
Therefore, when the power storage capacity of the power storage device is insufficient to sufficiently supply electric power to the motor generator, there is a concern that not only the decrease in the combustion efficiency of the engine cannot be avoided, but also the sudden increase in the pump absorption power may cause the Engine power fluctuates sharply causing the engine to stall

Method used

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no. 1 approach

[0025] figure 1 It is a side view of the hydraulic excavator 1 according to the first embodiment of the present invention. figure 2 It is a configuration diagram showing a hydraulic drive unit mounted on a hydraulic excavator. image 3 It is a schematic diagram showing the configuration of the controller of the hydraulic excavator. Figure 4 It is a schematic diagram showing the processing of the load calculation unit of the controller.

[0026]

[0027] The hydraulic excavator 1 as the first embodiment of the working machine of the present invention is a so-called hybrid excavator, such as figure 1 As shown, it has: an undercarriage 2 having a crawler-type traveling device 2 a ; and a revolving upper body 3 rotatably mounted on the undercarriage 2 . The undercarriage 2 and the upper revolving structure 3 are rotatably attached via a revolving device 4 .

[0028] A cab 3a is provided on the front side of the upper revolving structure 3 for a driver to ride on and operat...

no. 2 approach

[0108] Figure 11 It is a schematic diagram showing the processing performed by the load calculation unit 21A of the controller 15 of the hydraulic excavator 1 according to the second embodiment of the present invention. The second embodiment differs from the above-mentioned first embodiment in that, compared to the load calculation unit 21 of the first embodiment, which calculates the load power from the engine power and the motor generator power, the load calculation unit 21A of the second embodiment is set to The load power is calculated from the output of the hydraulic pump 12 . In addition, in this 2nd Embodiment, the same code|symbol is attached|subjected to the part which is the same as or corresponds to 1st Embodiment.

[0109]

[0110] The load calculation unit 21A has a pump pressure detection unit 41 that detects the discharge pressure of the hydraulic pump 12 , and a pump flow rate detection unit 42 that detects the discharge flow rate of the hydraulic pump 12 ....

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Abstract

The present invention provides a working machine capable of suppressing sudden changes in engine power, comprising: an engine (11); a hydraulic pump (12) driven by the engine (11); A hydraulic actuator (17) driven by hydraulic oil; a motor generator (13) driven by a hydraulic pump (12); an electric storage device (14) that transfers power between the motor generator (13); a computing engine ( 11), a load calculation unit (21) of load power; a vehicle body state management unit (22) that manages the state of the vehicle body including the state of the power storage device (14); an engine power fluctuation limiting unit (23), which and the state of the vehicle body to calculate the second target power for limiting the increase rate and decrease rate of the power of the engine (11); the hydraulic power limiting unit (24), which limits the power of the hydraulic pump (12) based on the second target power; and an auxiliary power calculation unit (25) that limits the power of the motor generator (13) based on the second target power.

Description

technical field [0001] The present invention relates to a work machine such as a hydraulic excavator, and more particularly to a work machine capable of driving a hydraulic pump by an engine and a motor generator. Background technique [0002] In recent years, in such hydraulic excavators and other working machines, the aim is to save energy (reduce fuel consumption) or to reduce the amount of exhaust gas (such as carbon dioxide, nitrogen oxides, particulate matter, etc.) , proposed a so-called hybrid construction machine that uses a motor generator as a power source on the basis of an engine. In such a hybrid construction machine with a motor generator, when the pump absorbed power is higher than the engine output upper limit value, the difference between the pump absorbed power and the engine output upper limit value is supplemented by the power of the motor generator. control, thereby making the power increase speed of the engine below a predetermined value. [0003] Pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02F9/20B60K6/485B60W10/06B60W10/08B60W20/10
CPCB60K6/485B60W10/06B60W10/08B60W20/00B60W2710/0677E02F3/435E02F9/2075E02F9/2091E02F9/2235E02F9/2246E02F9/2296Y02T10/62E02F3/32
Inventor 石原新士星野雅俊坂本博史佐竹英敏
Owner NIHON KENKI CO LTD