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Thermostat diagnosis method and system, engine cooling system and electronic controller

A diagnostic method and diagnostic system technology, applied in the direction of engine cooling, machine/engine, coolant flow control, etc., can solve the problems of low reliability of thermostat diagnostic method, long formulation cycle, narrow application range, etc. , to achieve cost and workload savings, strong applicability, and improved reliability

Active Publication Date: 2020-10-30
UNITED AUTOMOTIVE ELECTRONICS SYST
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Problems solved by technology

[0009] The purpose of the present invention is to provide a thermostat diagnosis method to solve the problems of low reliability, narrow application range and long formulation period of the existing thermostat diagnosis method

Method used

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  • Thermostat diagnosis method and system, engine cooling system and electronic controller
  • Thermostat diagnosis method and system, engine cooling system and electronic controller
  • Thermostat diagnosis method and system, engine cooling system and electronic controller

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Embodiment Construction

[0074] The method for diagnosing the thermostat proposed by the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that all the drawings are in a very simplified form and use imprecise scales, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention. In addition, the structures shown in the drawings are often a part of the actual structures. In particular, each drawing needs to display different emphases, and sometimes uses different scales.

[0075] The inventors of the present application found that the difference between the water temperature of the first cooling line 11 and the water temperature of the second cooling line 12 in the current dual-water temperature engine cooling system under the fault condition of the thermostat 14 and the normal condition have great distinction.

[0076] (1) In the case of a fau...

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Abstract

The invention provides a thermostat diagnosis method. Compared with the situation that an existing engine thermal management system possibly has certain defects in design for a vehicle of which the temperature rise of a second-channel water temperature sensor is obvious before a thermostat is started, under the conditions of not changing the structure of the existing thermal management system andnot increasing the hardware cost, according to the diagnosis method, the thermostat is subjected to diagnosis by calculating the difference between the one-channel water temperature and the two-channel water temperature, so that the reliability of the diagnosis is improved, the cost and workload for changing an engine thermal management system are saved, and the applicability to different engine heat management systems is high; besides, compared with the situation that installation is inconvenient and the installation cost is high due to the fact that an existing diagnosis strategy limits thesecond-channel water temperature sensor to be arranged on a radiator, according to the thermostat diagnosis method, the second-channel water temperature sensor only needs to be arranged at the position, adjacent to the thermostat, of a second cooling pipeline, so that installation is convenient, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of engine cooling, in particular to a thermostat diagnosis method and system, an engine cooling system and an electronic controller. Background technique [0002] According to the regulations of GB 18352.6-2016 "Light Vehicle Pollutant Emission Limits and Measurement Methods (China Phase VI)", for vehicles equipped with thermostats, the OBD (On Board Diagnostics) system should monitor the Whether the working condition of the thermostat is normal. The thermostat is a valve that controls the flow path of the engine coolant. It adjusts the heat dissipation capacity of the cooling system by changing the range of coolant circulation to ensure that the engine works within a suitable temperature range. [0003] Such as figure 1 As shown, a dual water temperature engine cooling system includes: a first cooling pipeline 11, a second cooling pipeline 12, a radiator 13 and a thermostat 14, wherein the first cooling p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01P7/16F01P11/14F02B77/08
CPCF01P7/16F01P11/14F02B77/08
Inventor 刘兴敏黄慧龙张海林张喜岗赵鹏陈琦杜庆贺
Owner UNITED AUTOMOTIVE ELECTRONICS SYST
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