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EGR (Exhaust Gas Recirculation) rate speculating and detecting device

A technology of detection device and estimated value, which is applied in the charging system, adding non-fuel substances to fuel, internal combustion piston engine, etc., can solve problems such as increased cost and complex structure, and achieve the effect of reducing production cost and avoiding complexity.

Inactive Publication Date: 2011-07-27
HONDA MOTOR CO LTD
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Problems solved by technology

[0005] However, in the technique described in Patent Document 1, many high-performance sensors that directly detect the gas concentration are required, and there are problems of complicated structure and high cost.

Method used

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  • EGR (Exhaust Gas Recirculation) rate speculating and detecting device
  • EGR (Exhaust Gas Recirculation) rate speculating and detecting device
  • EGR (Exhaust Gas Recirculation) rate speculating and detecting device

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Embodiment Construction

[0028] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. figure 1 It is a block diagram showing the configuration of the EGR rate estimation detection device 30 according to one embodiment of the present invention. in addition, figure 2 It is a block diagram showing the flow of engine control using an EGR rate estimated value. and then, image 3 is a time chart showing the relationship between the crank pulse signal and the change in the crank angular velocity ω during one cycle, Figure 4 yes image 3 Enlarged view of part of . The EGR rate estimation and detection device 30 is built in the ECU 50 which controls the engine 5 .

[0029] The EGR rate estimation detection device 30 according to the present embodiment can obtain an estimated value of the EGR rate based on the output signal of the crank pulse generator rotor 2 for detecting the rotational position of the crankshaft 1 of the engine 5 . The...

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Abstract

An EGR rate speculating and detecting device is enabled to detect the EGR rate inside an EGR based on the output signal of a crank pulse generator rotor. The device comprises an inhaled new gas mass detecting part for detecting the inhaled new gas mass of an engine based on the output signal of an airflow meter, an NeA calculation part for calculating the average engine rotating velocity on the basis of the crank pulse, a deltaw1 calculation part for calculating a first crank angular velocity (w1) of a first assigned range (tau 1) overlapping a compressing top dead-centre (TDC) of the engine and calculating a first variance (deltaw1) by subtracting the first crank angular velocity from the average engine rotating velocity (NeA), and a gas total mass speculation value exporting part for speculating the total mass of the gas inside the cylinder based on the value of the first variance (deltaw1). The EGR rate speculating and detecting device exports the exhaust gas recirculation rate of the discharged gas, namely the speculation value of the EGR rate on the basis of the inhaled new gas mass and the total mass speculation value of the gas inside the cylinder.

Description

technical field [0001] The present invention relates to an EGR rate estimation and detection device, and more particularly to an EGR rate estimation and detection device capable of estimation and detection of an exhaust gas recirculation rate (EGR rate) in an engine. Background technique [0002] Conventionally, it is known that a part of the exhaust gas of the engine is led to the intake side, mixed with the air-fuel mixture again, and then inhaled, thereby reducing the nitrogen oxides in the exhaust gas and realizing the mileage per liter of fuel. Enhanced exhaust gas recirculation (EGR: Exhaust GasRecirculation) technology. In EGR, there is "external EGR" in which a bypass pipe is installed between the intake pipe and the exhaust pipe to circulate the exhaust gas, and the timing of closing the exhaust valve is advanced so that the exhaust gas remains In the "internal EGR" in the working cylinder, no matter what kind of EGR technology is used, the "EGR rate", which indica...

Claims

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Application Information

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IPC IPC(8): F02M25/07F02D45/00
CPCY02T10/128Y02T10/121Y02T10/12
Inventor 西田宪二
Owner HONDA MOTOR CO LTD
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