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Diagnosis method and system for thermostat, engine cooling system and electronic controller

A diagnosis method and technology of diagnosis system, which are applied in the direction of engine cooling, machine/engine, coolant flow control, etc., can solve the problems of low reliability of thermostat diagnosis method, narrow application range and long formulation cycle. , to achieve the effect of saving huge cost and workload, long development cycle and high installation cost

Active Publication Date: 2021-08-31
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Diagnosis method and system for thermostat, engine cooling system and electronic controller
  • Diagnosis method and system for thermostat, engine cooling system and electronic controller
  • Diagnosis method and system for thermostat, 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. For vehicles whose temperature rises significantly in the second water temperature sensor before the thermostat is opened, even if there may be some defects in the design of the engine thermal management system, the existing thermal management system will not be changed. Under the condition of management system structure and no increase of hardware cost, the diagnosis method provided by the present invention diagnoses the thermostat by calculating the difference between the water temperature of the first road and the water temperature of the second road, which not only improves the reliability of the diagnosis, but also saves the need to change the thermal management of the engine. The cost and workload of the system are highly applicable to different engine thermal management systems. In addition, the existing diagnosis strategy restricts the installation of the second water temperature sensor on the radiator, which is inconvenient and expensive to install. However, the second water temperature sensor of the present invention only needs to be installed at the position where the second cooling pipeline is adjacent to the thermostat. Convenient and low cost.

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] like 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 pipe...

Claims

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Application Information

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Patent Type & Authority Patents(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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