Intercooling system fault diagnosis method and system
A fault diagnosis and cooling system technology, applied in electrical control, machine/engine, fuel injection control, etc., can solve problems such as poor heat radiation and heat dissipation, false alarm of intercooling system faults, etc., to improve compliance and avoid fault errors reported effect
Active Publication Date: 2022-02-18
BYD CO LTD
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Problems solved by technology
[0004] When the engine is in a high ambient temperature, the intercooler will be in a working condition with poor heat radiation and heat dissipation effect, which will easily lead to false alarms of the intercooler system failure; Intercooling system failure false alarm problem
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[0034] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
[0035] The English abbreviations below represent the following devices or parameters:
[0036] ACC: ignition switch; Tcs: water temperature sensor; Tts: supercharged gas temperature sensor; Midcpmw: intercooling water pump control circuit; Midcpm: intercooling water pump; ECU: engine control unit; tr: engine running time; Tcolnt: engine water temperature; Tturb : supercharged gas temperature; Tintake: intake air temperature; Ct: intercooling system diagnostic counter count value; △t: temperature difference threshold between intake air temperature and supercharged gas; MIL: malfunction indicator light; Fan: fan.
[0037] like figure 1 As shown, an embodiment of...
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The invention provides an intercooling system fault diagnosis method and system, and belongs to the field of engines. The method comprises the following steps: S1, determining that a first parameter of an engine meets a diagnosis condition; s2, obtaining the current air inlet temperature and the supercharged gas temperature of an air inlet of the engine, and according to the comparison result of the air inlet temperature, the supercharged gas temperature and a first preset condition, updating the counting value of a diagnosis counter of the intercooling systemcorrespondingly; s3, when it is confirmed that the updated counting value of the diagnosis counter of the intercooling system is equal to the fault confirmation time value of the intercooling system, comparing the current vehicle speed of the vehicle with a preset vehicle speed value; s4, if the current vehicle speed of the vehicle is equal to the vehicle speed preset value, continuously outputting a fan rotating speed control signal, and circularly executing the steps S2-S3; and S5, if the current vehicle speed of the vehicle is not equal to the vehicle speed preset value, executing fault prompting. According to the invention, the coincidence degree of diagnosis and actual conditions can be improved.
Description
technical field [0001] The invention relates to the field of engines, in particular to a fault diagnosis method for an intercooling system and a fault diagnosis system for an intercooling system. Background technique [0002] In the prior art, it is the most economical and effective method to increase the output power of the engine by using air intake supercharging for the engine. The commonly used turbocharged engine uses the exhaust gas from the engine to impact the turbine of the turbocharger to run at a high speed, thereby driving the coaxial compressor of the turbine to rotate at a high speed, and forcing the pressurized air from the compressor to the engine cylinder. , to increase the engine output power. Due to the high temperature of the exhaust gas that the turbine in the turbocharger is exposed to, the fresh air is heated during the process of passing through the turbocharger, which will exceed the reasonable temperature range of the gas entering the engine cylind...
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IPC IPC(8): F02B77/08F02D41/22
CPCF02B77/08F02D41/22Y02T10/12
Inventor 何斌
Owner BYD CO LTD