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Air inlet throttle control method and device

An air intake throttling and valve control technology, applied in engine control, machine/engine, mechanical equipment, etc., can solve the problems of large calibration amount and difficult to control accurately, and achieve the effect of reducing calibration amount and improving engine performance

Active Publication Date: 2013-10-09
WEICHAI POWER CO LTD
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Problems solved by technology

[0011] Although the control of EGR rate by this control method is direct, when it is used to control temperature, since the control object (intake throttle valve) and the control target (temperature) are separated and not directly related, this control The method is indirect, not easy to control accurately and the calibration amount is large

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  • Air inlet throttle control method and device

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Embodiment Construction

[0051] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0052]The air intake throttle valve control method provided by the present invention divides the working conditions of the engine into three basic working conditions: low speed and low load, high speed and high load, and medium speed and medium load.

[0053] Among them, the low-speed and low-load conditions mean that the engine speed and torque are less than 25-35% of the calibrated speed and calibrated torque respectively; the high-speed and high-load conditions mean that the engine speed and torque are greater than 65-75% of the calibrated speed and torque For medium speed and medium load.

[0054] The low-speed and low-load operating conditions of the engine in this embodiment refer to its rotational speed and torque being less ...

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Abstract

The invention discloses an air inlet throttle control method and an air inlet throttle control device. The air inlet throttle control method comprises the following steps of: setting a discharge temperature Tset and an air inlet mass flow rate mset; when an engine is in a low-speed and low-load working condition and the actual discharge temperature Tact is lower than the set discharge temperature Tset, adopting a closed-loop control mode, and regulating aperture of an air inlet throttle by taking the set discharge temperature Tset as a control target; when the engine is in a high-speed and high-load working condition and the actual air inlet mass flow rate mact is higher than the set air inlet mass flow rate mset, adopting a closed-loop control mode, and regulating the aperture of the air inlet throttle by taking the set air inlet mass flow rate mset as the control target; and when the engine is in other working conditions, causing the air inlet throttle to be in an open-loop control mode. By adopting the air inlet throttle control method and the air inlet throttle control device, EGR (exhaust gas recirculation) rate and temperature can be respectively accurately controlled according to the working condition of the engine, so that performance of the engine is obviously improved.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a method for controlling an intake throttle valve of an engine. The invention also relates to a control device implementing said control method. Background technique [0002] Diesel engines must adopt appropriate after-treatment systems to meet emission requirements, and exhaust after-treatment systems have gradually become the standard configuration of diesel engines. [0003] At present, diesel vehicles and machinery generally use exhaust gas treatment devices such as EGR (exhaust gas recirculation system), SCR (urea selective catalytic reduction system), and DPF (particulate filter). [0004] EGR can introduce part of the exhaust gas into the intake system to reduce the concentration of nitrogen and oxygen in the engine exhaust. The ratio of the exhaust gas flow introduced into the intake system to the total flow of the intake system is the EGR rate. The higher the proportion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D9/08
Inventor 李大明刘兴义伏金龙李栋
Owner WEICHAI POWER CO LTD
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