Cooling fan driving device and fan rotation speed control method
A cooling fan and driving device technology, applied in the direction of coolant flow control, fluid pressure actuating device, pump device, etc., can solve the problems of hydraulic oil temperature rise, overflow noise increase, engine fuel consumption deterioration, etc., to reduce energy consumption loss effect
Inactive Publication Date: 2013-07-17
KOMATSU LTD
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Problems solved by technology
In this way, if the pressure oil ejected from the hydraulic pump is discharged in vain, it will cause disadvantages such as deterioration of engine oil consumption, increase of hydraulic oil temperature, and increase of overflow noise.
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[0052] Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings. The cooling fan driving device and the fan rotational speed control method of the present invention can be suitably applied to a work vehicle having a cooling fan.
[0053] In particular, it can be preferably applied to work vehicles that frequently perform acceleration and deceleration of the engine. For example, in a work vehicle such as a wheel loader, during loading and unloading operations, etc., since forward and backward operations and V-shaped operations are repeated, acceleration and deceleration operations of the engine are frequently performed.
[0054] When the acceleration and deceleration operations of the engine are frequently performed, the rotation speed of the hydraulic pump for the cooling fan driven according to the rotation of the engine is also accelerated and decelerated according to the rotation speed of the engine. Furtherm...
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The invention provides a cooling fan driving device and the a fan rotational speed control method using the device capable of reducing uneconomical waste of flow volume of pressurized oil discharged from a hydraulic pump when the rotational speed of a cooling fan is increased to the target rotational speed. The target rotational speed of the cooling fan is set at a target rotational speed setting portion 22 of a controller 7 based on temperature of refrigerant and hydraulic oil and the rotational speed of an engine. An acceleration pattern for increasing the rotational speed of the cooling fan to the target rotational speed is set at an acceleration pattern setting portion 23 based on the rotational speed of the cooling fan, the target rotational speed set at the target rotational speed setting portion 22, and magnitude of force due to inertia of the cooling fan and the hydraulic motor which drives the cooling fan. The rotational speed command value calculation portion 24 performs control so that pressurized oil is supplied to the hydraulic motor at a flow rate required when the hydraulic motor is controlled to be accelerated based on the acceleration pattern. Thus, it is possible to reduce relief flow volume to be wasted without being consumed for the acceleration control of the hydraulic motor.
Description
technical field [0001] The present invention relates to a driving device of a cooling fan used in a hydraulically driven machine such as a construction machine and a method for controlling the rotational speed of a fan using the same. Background technique [0002] In hydraulically driven machines such as construction machinery, the pressure oil discharged from the hydraulic pump for the cooling fan driven by the engine is supplied to the hydraulic motor that rotates the cooling fan, and the flow rate of the pressure oil supplied to the hydraulic motor is controlled, thereby controlling The speed of the hydraulic motor is the speed of the cooling fan. Furthermore, the rotation speed of the cooling fan is controlled so that the temperature of the cooling water in the engine, the temperature of the hydraulic oil, and the like become desired temperatures. [0003] As a configuration for controlling the rotation speed of a cooling fan, a fan rotation speed control method (for ex...
Claims
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IPC IPC(8): F01P7/04F04D25/04F04D27/00F15B11/00
CPCF01P7/044F04B49/20F04D25/08F04B49/002F15B11/042F04D25/04F15B2211/633F04D13/12F04D25/16F04B49/065
Inventor 今泉雅明和田稔
Owner KOMATSU LTD