Control method of hybrid working machine and pump output limiting method of hybrid working machine

A technology of working machinery and control methods, which is applied in the direction of engine control, liquid variable displacement machinery, pump control, etc., and can solve problems such as auxiliary engines, insufficient battery charge, and low engine operating efficiency

Inactive Publication Date: 2015-08-19
SUMITOMO HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the hydraulic load continuously requires a large hydraulic pressure, a state such as the charge of the battery is insufficient to assist the engine by the electric motor
In this case, the output required by the hydraulic pump to the engine becomes greater than the maximum output of the engine, and the engine becomes overloaded, which not only lowers the operating efficiency of the engine, but in the worst case may cause the engine to stall and cause engine stop

Method used

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  • Control method of hybrid working machine and pump output limiting method of hybrid working machine
  • Control method of hybrid working machine and pump output limiting method of hybrid working machine
  • Control method of hybrid working machine and pump output limiting method of hybrid working machine

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Embodiment Construction

[0044] Embodiments of the present invention will be described with reference to the drawings.

[0045] First, a control device for a hydraulic shovel as an example of a hybrid working machine to which the output limiting method according to the present invention is applied will be described. figure 1 It is a block diagram showing a control circuit of a hydraulic shovel to which the control method according to the present invention is applied. In addition, the hybrid working machine to which the present invention is applied is not limited to the hydraulic shovel.

[0046] first of all, yes figure 1 The structure of the control circuit of the hydraulic excavator shown will be described. Switching valves 22 a , 22 b , and 22 c are connected to oil passages of a variable displacement hydraulic pump (hereinafter, simply referred to as a hydraulic pump) 21 driven by the engine motor 1 . Furthermore, a pump discharge pressure sensor 23 is connected to the oil passage on the upstre...

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Abstract

In a hybrid working machine, a hydraulic pump (21) is driven with the output of an engine (30) and the output of a motor generator (34). The input side power (Win) of the hydraulic pump (21) is calculated, and the output of the motor generator (34) is controlled based on the calculated power (Win). This makes it possible to precisely determine the input side power of the hydraulic pump (21) and to control the load of the engine based on the input side power.

Description

technical field [0001] The present invention relates to a control method of a hybrid working machine and a pump output control method, in particular to a control method and a pump output control method of a hybrid working machine which generates hydraulic pressure by driving a pump with an electric motor assisting an internal combustion engine. Background technique [0002] A hybrid working machine usually drives a hydraulic pump with the output of an engine (internal combustion engine), and works with the generated hydraulic pressure. And, the engine is efficiently operated by assisting the engine by the electric motor. Electric motors are primarily driven by electricity from batteries. The battery is a charge-discharge type, and it discharges when assisting the engine, and supplies power to the electric motor. On the other hand, when the engine is not being assisted, it is charged with electric power from a generator driven by the engine or regenerative electric power fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02F9/20B60K6/48B60W10/30B60W20/00F02D29/04F04B49/00F15B11/00F15B21/14
CPCE02F9/2075F04B17/05B60K6/485F15B2211/20553B60W10/08Y02T10/6226F15B2211/20523F04B17/03B60L11/14F15B2211/26E02F9/2246F15B2211/20515B60W10/30Y02T10/7077F15B2211/6651F02D29/04F15B2211/633Y02T10/70B60W20/00F03C1/003F15B21/087F04B2203/0208B60L1/003F15B2211/6309B60W30/1886F15B2211/6306B60L50/16Y02T10/62Y02T10/7072E02F9/20F15B21/14
Inventor 吴春男
Owner SUMITOMO HEAVY IND LTD
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