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Apparatus and method of determining failure in thermostat

A thermostat and fault technology, applied in fault prevention, mechanical equipment, machine/engine, etc., can solve problems such as long time, and achieve the effect of suppressing computing load and improving fault determination accuracy

Active Publication Date: 2014-02-12
MITSUBISHI MOTORS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it takes a long time to obtain the judgment result

Method used

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  • Apparatus and method of determining failure in thermostat
  • Apparatus and method of determining failure in thermostat
  • Apparatus and method of determining failure in thermostat

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Embodiment Construction

[0029]Embodiments will now be described with reference to the drawings. Note that the embodiments described below are merely examples, and application of various modifications and techniques not illustrated in the embodiments should not be intended to be excluded. A plug-in hybrid electric vehicle (PHEV) operating using an engine and a motor is illustrated here as an example.

[0030] [1. Structure of equipment]

[0031] figure 1 A cooling passage 11 for an engine 10 provided with an apparatus for judging a failure according to the present embodiment is illustrated. The cooling passage 11 is a path for circulation of a coolant flowing in a water jacket (not shown) of the engine 10 . The cooling passage 11 extends from the water jacket, branches into a first circulation passage 11 a and a second circulation passage 11 b joined upstream of a water pump (WP) 12 , and returns to the water jacket of the engine 10 .

[0032] The water pump 12 is a mechanical pump for circulatin...

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Abstract

An apparatus is provided that determining a failure in a thermostat (14) for controlling the flow of a coolant into a radiator (13) in response to an actual water temperature (WT) of the coolant for an engine (10) in a vehicle. The apparatus includes: a water temperature detector (16) that detects the actual water temperature (WT); a water temperature estimator (22) that calculates an estimated water temperature (WT C ) of the coolant; and a failure determining unit (23) that compares the actual water temperature (WT) detected by the water temperature detector (16) with the estimated water temperature (WT C ) calculated by the water temperature estimator (22) under cold start of the engine (10) and determines whether the thermostat (14) is valve-open failure. In an engine nonoperating mode including at least automatic stop of the engine (10), the water temperature estimator (22) applies a behavior of the actual water temperature (WT) to an estimated water temperature (WT C ) calculated immediately before automatic stop of the engine (10) to calculate an estimated water temperature (WT C ) in the engine nonoperating mode.

Description

technical field [0001] The present invention relates to an apparatus and method for determining a valve opening failure in a thermostat provided in a cooling system of an engine. Background technique [0002] A radiator and a thermostat are provided in cooling passages through which coolant for the engine circulates. If the temperature of the coolant is equal to or higher than the predetermined temperature, the thermostat opens the valve to circulate the coolant through the radiator to dissipate heat; otherwise, if the temperature of the coolant is lower than the predetermined temperature, the thermostat closes the valve to Prevents the coolant from circulating through the radiator (ie, allows the coolant to bypass the radiator), allowing the temperature to rise. [0003] If an open valve failure (ie, failure of the valve to be fixed in an open state) occurs in a thermostat provided in such an engine cooling system, even coolant at a temperature below a predetermined temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01P11/14F01P11/16
CPCF01P11/14G01N25/72F01P11/16F01P2025/32F01P2060/08F01P2031/30F01P2050/24
Inventor 古田贤宽齐藤健司加村均
Owner MITSUBISHI MOTORS CORP
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