Cooling fan control unit

JP2026097045APending Publication Date: 2026-06-16DAIHATSU MOTOR CO LTD

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Patent Information

Authority / Receiving Office: JP · JP
Patent Type: Applications
Current Assignee / Owner: DAIHATSU MOTOR CO LTD
Filing Date: 2024-12-04
Publication Date: 2026-06-16

Application Information

Patent Timeline

04 Dec 2024

Application

16 Jun 2026

Publication

JP2026097045A

IPC: F01P7/04; F01P7/16; F01P3/20

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Application Domain

Liquid cooling Coolant flow control

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Abstract

The objective is to provide a cooling fan control device that can reduce the frequency with which the cooling fan is operated. [Solution] The cooling fan control device includes, for example, a control unit that acquires the water temperature of the coolant flowing through the radiator and the oil temperature of the oil flowing through the motor, determines whether the water temperature exceeds a first water temperature threshold for activating the cooling fan, and controls the cooling fan to activate if the water temperature is at least above the first water temperature threshold. The control unit also changes the water temperature threshold for activating the cooling fan to a second water temperature threshold that is higher than the first water temperature threshold if the oil temperature is at least below the first oil temperature threshold.

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Claims

1. The system includes a control unit that acquires the water temperature of the coolant flowing through the radiator and the oil temperature of the oil flowing through the motor, determines whether the water temperature exceeds a first water temperature threshold for activating the cooling fan, and controls the system to activate the cooling fan if the water temperature exceeds at least the first water temperature threshold. The control unit, when the oil temperature falls below at least a first oil temperature threshold, changes the water temperature threshold for activating the cooling fan to a second water temperature threshold that is higher than the first water temperature threshold. Cooling fan control device.

2. The control unit changes the water temperature threshold from the second water temperature threshold to the first water temperature threshold when the oil temperature exceeds a second oil temperature threshold which is at least higher than the first oil temperature threshold. The cooling fan control device according to claim 1.