Exhaust temperature control method and exhaust temperature control device for tgdi engine
A technology of exhaust temperature and control method, applied in engine control, electrical control, machine/engine, etc., can solve the problems of reducing TGDI engine performance, engine oil dilution, and reducing the lubricating effect of engine oil
Active Publication Date: 2018-03-20
ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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Problems solved by technology
[0006] However, if the exhaust gas temperature control method of the above-mentioned PFI engine is applied to the TGDI engine, the following problems will occur: in order to reduce the exhaust temperature, if the air-fuel ratio is too rich, more gas will be generated in the TGDI engine due to insufficient combustion. At the same time, there will be fuel splashing on the cylinder wall of the TGDI engine at this time, resulting in the problem of oil dilution, which will reduce the lubricating effect of the oil in the long run
Therefore, the above technical solution will reduce the performance of the TGDI engine
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[0042] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0043] Such as figure 1 As shown, the embodiment of the present invention provides a method for controlling the exhaust gas temperature of an engine, which includes the following steps:
[0044] S11. Calculate the initial estimated exhaust gas temperature T according to the initial operating parameters of the engine 1 ;
[0045] The initial operating parameters of the engine T 1 It can include engine speed, engine load, vehicle speed and engine intake temperature, etc., and the initial estimated exhaust gas temperature T of the engine can be determined by monitoring these parameters 1, the specific calculation method can be set according to the operating environment of the engine, of course, the exhaust temperature of the engine can also be di...
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The invention discloses a method for controlling the exhaust gas temperature of a TGDI engine, comprising steps: S11, calculating the initial estimated exhaust temperature; S12, judging whether the initial estimated exhaust temperature is greater than or equal to the set temperature of the over-temperature protection, and The temperature duration is greater than or equal to the over-temperature setting time, if yes, go to step S13; S13, reduce the air-fuel ratio from the current air-fuel ratio to the preset air-fuel ratio, the difference between the preset air-fuel ratio and the oil dilution critical air-fuel ratio The value is a preset difference; S14, calculate the first current estimated exhaust gas temperature according to the first current operating parameter of the engine; S15, judge whether the first current estimated exhaust gas temperature is less than the exit temperature limit, if not, enter Step S16; S16, judging whether the preset difference is 0, if not, return to step S13. This method can improve the performance of the TGDI engine. The invention also discloses an exhaust gas temperature control device of the TGDI engine.
Description
technical field [0001] The invention relates to the technical field of engine control, in particular to a method for controlling the exhaust gas temperature of a TGDI engine. The invention also relates to an exhaust gas temperature control device of a TGDI engine. Background technique [0002] In order to meet the increasingly stringent emission and fuel consumption regulations, TGDI (turbo charging + direct injection) technology has become the main development trend of gasoline engine miniaturization, and it is also one of the most mainstream core technology routes to achieve fuel saving and carbon emission reduction. . [0003] As we all know, the TGDI engine has obvious advantages over traditional engines in terms of economy, power, and emissions. Generally, the engine is much higher. If it runs in a high thermal load area for a long time, it will cause fatal damage to the engine's lubrication system and parts themselves (such as superchargers, valves, piston bushes, et...
Claims
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IPC IPC(8): F02D41/00
Inventor 涂安全王洪静韩晓峰吴琼任冰冰张士路
Owner ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD