Title:
ENGINE COLD START WARMUP METHOD
Document Type and Number:
WIPO Patent Application WO/2014/097354
Kind Code:
A1
Abstract:
The temperature of cooling water is detected when an engine is started, and when the detected temperature falls below a set water temperature, the operation of a water pump (1) is stopped independently from a normal control, wherein the rotational frequency of the water pump (1) is controlled in accordance with the engine operating state, and the total amount of heat required to raise the current water temperature to the set water temperature is calculated, and the total amount of heat lost from the engine to the cooling water since the engine was started is calculated. When the cumulative value reaches the aforementioned total amount of heat the water pump (1) is operated for a prescribed amount of time, thereby producing a uniform temperature distribution, after which the temperature of the cooling water is again detected. If the detected water temperature is still below the set water temperature the same control is repeated, and if the detected temperature is equal to or greater than the set water temperature normal control is restored.
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Inventors:
ISHIMORI TAKASHI (JP)
Application Number:
PCT/JP2012/008115
Publication Date:
June 26, 2014
Filing Date:
December 19, 2012
Export Citation:
Assignee:
HINO MOTORS LTD (JP)
International Classes:
F01P7/16; F01P7/14
Foreign References:
| JP2008169750A | 2008-07-24 | |||
| JP2012132379A | 2012-07-12 | |||
| JP2010190142A | 2010-09-02 | |||
| JP2010190048A | 2010-09-02 | |||
| JP2011220156A | 2011-11-04 |
Attorney, Agent or Firm:
Patent firm YAMADA PATENT OFFICE (JP)
Patent business corporation Yamada patent firm (JP)
Patent business corporation Yamada patent firm (JP)
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