Egr control device for internal combustion engine

A technology for control devices and internal combustion engines, applied in engine control, internal combustion piston engines, electrical control, etc., can solve difficult problems such as system simplification and matching difficulties
CN101065564AInactive Publication Date: 2007-10-31MITSUBISHI FUSO TRUCK AND BUS CORPORATION
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MITSUBISHI FUSO TRUCK AND BUS CORPORATION
Publication Date
2007-10-31
Estimated Expiration
Not applicable · inactive patent

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Abstract

An EGR control device for an internal combustion engine has an EGR control means (44) that, when a large amount of EGR is required, continuously controls the opening of an EGR valve (26) in a fully open direction and continuously controls the opening of a suction throttle valve (12) in a fully closed direction. In an insensible region in which variation in the amount of EGR is small relative to the opening of the suction throttle valve, the control means applies limitation to feedback control of the amount of EGR carried out by the suction throttle valve and performs, on the other hand, feedback control of an EGR amount carried out by the EGR valve to supplement the limited feedback control by the suction throttle valve.
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Description

technical field

[0001] The present invention relates to an EGR control device for an internal combustion engine requiring a large amount of exhaust gas recirculation (EGR). Background technique

[0002] In such an apparatus, a part of the exhaust gas is returned to the intake passage via the passage for EGR (EGR passage) and supplied to the combustion chamber. In addition, by feedback-controlling the exhaust gas recirculation amount (EGR amount), it is possible to ensure a good combustion state and to promote exhaust gas purification.

[0003] Here, in the conventional device, only the opening degree of the EGR valve that controls the flow rate in the EGR passage is controlled. However, in recent internal combustion engines, operation with a large amount of EGR (high EGR rate) is required. Therefore, in addition to the EGR valve described above, the opening degree of the intake throttle valve that controls the flow rate in the intake passage is also adjusted (see Japanese ...

Claims

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