EGR controlling apparatus and EGR controlling method
A technology of a control device and a control method, which is applied in the direction of electrical control, engine control, fuel injection control, etc., and can solve problems such as rising costs, expensive sensors, failure to detect faults, etc.
Inactive Publication Date: 2003-03-19
MITSUBISHI FUSO TRUCK AND BUS CORPORATION
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Problems solved by technology
For example, in the first prior art described above, although a permanent failure of the EGR valve can be detected, failures other than the EGR valve (such as failure of the EGR cooler and blockage of the EGR passage) cannot be detected.
[0009] In addition, in the above-mentioned second prior art, for example, a diesel engine generally does not have an air flow sensor, so when this technology is applied to a diesel engine, it is necessary to newly install an air flow sensor in order to detect a failure of the EGR device.
The airflow sensor is a relatively expensive sensor, so there is a problem that the cost increases significantly
[0010] In addition, in the above-mentioned third prior art, in addition to the lambda sensor (linear O 2 In addition to the problem of high cost caused by expensive sensors, there is also the problem of reduced reliability
Method used
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[0066] Hereinafter, an EGR control device according to a first embodiment of the present invention will be described with reference to the drawings, figure 1 It is a schematic diagram showing the composition of its main parts. figure 2 It is a control block diagram focusing on its main functions.
[0067] Such as figure 1 As shown, between an intake system 2 and an exhaust system (exhaust passage) 3 of an engine (internal combustion engine) 1, an EGR device (EGR adjustment device) 10 for recirculating a part of exhaust gas to the intake system 2 is provided. The EGR device 10 is mainly composed of an EGR passage 4 that connects the intake system 2 and the exhaust system 3 , and an EGR valve 5 that opens and closes the EGR passage 4 . Hereinafter, the exhaust gas that flows back from the EGR passage 4 to the intake system 2 is called EGR gas.
[0068] In addition, the EGR valve 5 is a valve for controlling the return flow rate of EGR gas to the intake system 2 , and an actu...
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The present invention relates to an EGR control unit and EGR control method for controlling an EGR adjusting apparatus (10), and it is an object of the invention to calculate an EGR rate at a low cost and to control an operation of the EGR apparatus (10) with high accuracy. The EGR control unit is made up of temperature detecting devices detect in-passage temperature at least two of passages of an intake passage (2b), an atmospheric air introduction passage (2a) located on the upstream side of the intake passage (2b) and communicated with the atmosphere and an EGR passage (4), an actual EGR rate calculating device (32) for calculating a rate of an exhaust gas to an intake gas in an internal combustion engine (1) on the basis of information on temperatures detected by the temperature detecting devices, and an EGR controller (30) for controlling the EGR adjusting device (10) through the use of the actual EGR rate calculated by the actual EGR rate calculating device (32).
Description
technical field [0001] The present invention relates to an exhaust gas recirculation (hereinafter referred to as EGR) control device and EGR control method. The EGR control device and EGR control method calculate the ratio (actual EGR rate) of EGR gas to a combustion chamber of an internal combustion engine to return to a combustion chamber, At the same time, the EGR adjustment device is controlled according to the calculated actual EGR rate. Background technique [0002] In the past, the well-known EGR device is to return part of the exhaust gas of the internal combustion engine (engine) to the intake air (fresh air) to seek NO X The lowered EGR device. [0003] In such an EGR device, an intake passage and an exhaust passage of the engine are connected by an EGR passage, and an EGR valve for controlling the recirculation amount of exhaust gas (EGR gas) (exhaust gas) is provided in the middle of the EGR passage. Then, in order to obtain a desired EGR rate according to the ...
Claims
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IPC IPC(8): F02M25/07F02D21/08F02D41/00
CPCF02D2200/0414F02D2041/0067F02D41/0072Y02T10/47Y02T10/40
Inventor 赤尾好之纐缬晋
Owner MITSUBISHI FUSO TRUCK AND BUS CORPORATION