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A method for diagnosing the rationality of engine coolant temperature sensor signals

A technology of engine coolant and temperature sensor, which is used in engine cooling, engine components, machines/engines, etc., and can solve problems such as excessive emissions and difficulty in starting.

Active Publication Date: 2021-07-06
DONGFENG MOTOR CORP HUBEI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The failure of the coolant temperature sensor will lead to excessive discharge, and it will also cause problems such as difficulty in starting

Method used

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  • A method for diagnosing the rationality of engine coolant temperature sensor signals
  • A method for diagnosing the rationality of engine coolant temperature sensor signals

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not limit the present invention.

[0028] Such as figure 1 As shown, the purpose of the present invention is to provide a method for accurately and reliably diagnosing the failure of the coolant temperature sensor in the area below the maximum allowable temperature lower limit, so as to meet the accurate control of the air-fuel ratio of the engine electronic control unit and the regulatory requirements.

[0029] The method for diagnosing the rationality of the engine coolant temperature sensor signal comprises the following steps:

[0030] S01: Judging whether the stationary time of the vehicle is greater than or equal to Kt0 (calibratable amount), if no, the diagnosis ends; if yes, execute step S02. Although the layout of the vehicle cabin is not the same, as the...

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Abstract

The invention relates to the technical field of engine fault diagnosis, in particular to a method for diagnosing the rationality of a signal of an engine coolant temperature sensor. Determine whether the vehicle standing time is greater than or equal to Kt0, if yes, determine whether the engine running time is less than or equal to Kt1, if yes, determine whether the supercharged intake air temperature T_Boost, atmospheric temperature T_Baro and coolant temperature T_Cool are all within Within the effective value range, if yes, then judge whether the absolute value of the difference between the supercharged intake air temperature T_Boost and the atmospheric temperature T_Baro is less than or equal to KT1, if yes, then judge the mean value of the supercharged intake air temperature T_Boost and the atmospheric temperature T_Baro Whether the absolute value of the difference with the coolant temperature T_Cool is less than or equal to KT2, if yes, the rationality diagnosis of the coolant temperature sensor passes, if no, then judge whether the state duration FT is less than or equal to Kt2, if no , the rationality diagnosis of the coolant temperature sensor fails.

Description

technical field [0001] The invention relates to the technical field of engine fault diagnosis, in particular to a method for diagnosing the rationality of a signal of an engine coolant temperature sensor. Background technique [0002] The engine coolant temperature sensor is one of the important sensors in the engine electronic control system. Starting control, warm-up control, cooling fan control, etc. will require the measurement value provided by the coolant temperature sensor. The failure of the coolant temperature sensor will lead to excessive emissions, and it will also cause problems such as difficulty in starting. [0003] It is pointed out in the National VI emission regulations that in order to maximize the use of all possible information, if the coolant temperature sensor improperly gives a temperature lower than the lower limit of the temperature required for the highest start-up OBD (on-board diagnostic system) monitoring, the OBD system will No other diagnosis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02B77/08F01P11/16
CPCF01P11/16F02B77/08
Inventor 杜佳正陈卫方满全平周敏华周广
Owner DONGFENG MOTOR CORP HUBEI
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