Honda Motor Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Eiji Hashimoto

Yuji Yasui

Yoshihisa Iwaki

Hisao Haga

Masahiro Sato

Shusuke Akazaki

Hideki Matsunaga

Tetsuya Ishiguro

Koichi Nakajima

Masafumi Sakota

Kanako Shimojo

Naohiro Sato

Yshihisa Iwaki

Yosuke Tachibana

Mitsuo Hashizume

Masayuki Yoshiiri

Eisei Yamazaki

Kengo Takada

Naoki Fukuoka

An internal combustion engine control device includes a combustion degree of stoppage determination unit which determines whether stoppage of combustion of an internal combustion engine has reached a threshold degree, and an internal combustion engine control unit which performs a normal control in the case that the combustion of the engine is resumed in a state where stoppage of combustion has not reached the threshold degree, and performs a soot suppression control in the case that the engine combustion is resumed in a state where stoppage of combustion has reached the threshold degree. In the soot suppression control, the split injection or the single injection is carried out within the predetermined stroke, and the engine control unit causes a fuel injection timing in the single injection of the soot suppression control to be delayed with respect to the fuel injection timing in the single injection of the normal control.

Internal combustion engine control device, internal combustion engine control method, and vehicle

An exhaust purification system for an internal combustion engine is provided that can maintain the NOx purification rate of a selective reduction catalyst at near the maximum thereof. The exhaust purification system is provided with an oxidation catalyst and CSF provided in the exhaust plumbing of the engine, a selective reduction catalyst that is provided in the exhaust plumbing on the downstream side of oxidation catalyst and CSF, and selectively reduces NOx in the exhaust, and a NOsensor that detects NOin the exhaust inside of the exhaust plumbing on the downstream side of the selective reduction catalyst. An ECU executes NO-NOx ratio decrease processing to cause the NO-NOx ratio corresponding to the ratio of NOto NOx in the exhaust flowing into the selective reduction catalyst to decrease, in a case of a detection value Vnofrom the NOsensor being greater than a predetermined value Vno_th.

Exhaust purification system for internal combustion engine

An exhaust gas purifying system includes: a SCR catalyst which has a function of reducing NOx and absorbing NO; an upstream catalyst which is provided at the upstream side of the SCR catalyst and has a three-way purification function; and an air-fuel ratio controller which controls the air-fuel ratio of the air-fuel mixture. The controller calculates the NOstorage amount of the SCR catalyst (S2), calculates a value of the NOx correlation parameter that increases in response to the NOx discharge amount (S4), sets the stoichiometry determination threshold value to a small value as the NOstorage amount increases (S5), and changes the operation mode of the engine to the stoichiometry operation mode in which the air-fuel ratio is controlled to stoichiometry when the value of the NOx correlation parameter is larger than the stoichiometry determination threshold value (S6, S9).

Exhaust gas purifying system of internal combustion engine

An exhaust purification system for an internal combustion engine is provided that can steadily maintain a NOx purification rate of a selective reduction catalyst to be high without allowing the fuel economy or marketability to deteriorate. The exhaust purification system includes a NO&#x2014;NOx ratio adjustment mechanism that causes a NO&#x2014;NOx ratio to change; and a NO&#x2014;NOx ratio perturbation controller that executes NO&#x2014;NOx ratio perturbation control so that a NObalance of the selective reduction catalyst in a predetermined time period, with NOadsorption being positive and NOrelease being negative, is 0. Herein, NO&#x2014;NOx ratio perturbation control is defined as control that alternately executes NOincrease control to cause the NO&#x2014;NOx ratio to be greater than a reference value near 0.5, and NOdecrease control to cause the NO&#x2014;NOx ratio to be less than the reference value.

An EGR control apparatus for an internal combustion engine, which is capable of properly controlling an inert gas amount of two types of EGR gas supplied to cylinders of the engine via two paths different from each other, thereby making it possible to ensure a stable combustion state, reduced exhaust emissions, and improve operability. The EGR control apparatus includes low-pressure and high-pressure EGR devices, and an ECU. The ECU controls the low-pressure and high-pressure EGR gas amounts according to engine speed and demanded torque, and when a combination of engine speed and demanded torque is in a predetermined region, the low-pressure and high-pressure EGR gas amounts are controlled such that inert gas in low-pressure EGR gas exceeds in amount inert gas in high-pressure EGR gas, and the former more exceeds the latter as engine speed is higher or demanded torque is larger.

EGR control apparatus for internal combustion engine

A control system for a plant e.g. as a non-linear system, which is capable of properly suppressing interaction occurring between a plurality of control inputs and a plurality of controlled variables, thereby making it possible to properly control the controlled variables and easily design the control system. In the control system, each of a plurality of interaction suppression parameters for correcting the control inputs, respectively, such that the interaction is suppressed is calculated using a neural network constructed by using, out of the plurality of control inputs, a control input other than a control input corrected by a calculated interaction suppression parameter, as an input, and the interaction suppression parameter as an output.

Control system for plant

A catalyst degradation determination device is provided that can determine the degradation of a selective reduction catalyst with high precision while also suppressing a temporary decline in purification performance. By way of controlling a urea injection device, the catalyst degradation determination device increases, in a selective reduction catalyst in a state in which the storage amount is a maximum, the storage amount thereof by a detection reduced-amount portion DST, and then decreases the amount until it is determined that ammonia slip has occurred. Then, degradation is determined based on the time at which the slip determination flag Fwas set to '' when fluctuating the storage amount. The detection reduced-amount portion DSTis set to a value that is larger than the storage capacity of the selective reduction catalyst in a degraded state and smaller than the storage capacity of the selective reduction catalyst in a normal state.

Catalyst degradation determination device for exhaust purification system

An EGR control apparatus for an internal combustion engine, which is capable of accurately controlling an inert gas amount and an inert gas ratio of two types of EGR gas supplied to cylinders of the engine via two paths different from each other, thereby making it possible to ensure a stable combustion state and reduced exhaust emissions. The EGR control apparatus includes a low-pressure EGR device, a high-pressure EGR device, and an ECU. The ECU calculates a target low-pressure opening, calculates an estimated value of an in-cylinder low-pressure inert gas flow rate, which is the estimated value of an inert gas amount included in low-pressure EGR gas supplied to the cylinders via an intake passage, calculates a target high-pressure opening using the estimated value, and controls low-pressure and high-pressure EGR control valves, using the target low-pressure opening and the target high-pressure opening.

The present invention provides a controller for controlling a modeled plant robustly against disturbance. The controller comprises an estimator and a control unit. The estimator estimates disturbance applied to the plant. The control unit determines an input to the plant so that an output of the plant converges to a desired value. The input to the plant is determined to include a value obtained by multiplying the estimated disturbance by a predetermined gain. Since estimated disturbance is reflected in the input to the plant, control having robustness against disturbance is implemented. The controller may comprise a state predictor. The state predictor predicts the output of the plant based on the estimated disturbance and dead time included in the plant. The control unit determined the input to the plant so that the predicted output converges to a desired value. Since the state predictor allows for the dead time, the accuracy of the control is improved. The estimated disturbance is reflected in the predicted output, an error between the predicted output and an actual output of the plant is removed.

Controller for controlling a plant

A control system for a plant is disclosed. The control system includes a controller for controlling the plant based on a controlled object model which is obtained by modeling the plant. The controlled object model is modeled using an input and an output of the plant which are sampled at intervals of a sampling period which is longer than a control period of the controller. The sampled input of the plant is a filtered control output which is obtained by filtering an output of the controller. The controller carries out a control process of the plant at intervals of the control period.

A control system for a plant is disclosed. The control system includes a controller which controls the plant based on a controlled object model which is obtained by modeling the plant. The controlled object model is modeled using an input and an output of the plant which are sampled at intervals of a period which is longer than a control period of the controller. The controller carries out a control process of the plant at intervals of the control period.

A high precision deterioration determination device for an exhaust gas purifier of an engine is provided. The engine includes an exhaust gas purifier disposed in an exhaust pipe of the engine, and a downstream exhaust gas sensor disposed in the exhaust pipe on the downstream of the purifier for generating outputs corresponding to components of an exhaust gas. The electronic control unit controls an air/fuel ratio of the engine to a predetermined value based on the outputs of the downstream exhaust gas sensor. The control unit is programmed to perform a non-linear filtering to extract rectangle-shaped waveform components from the outputs of the downstream exhaust gas sensor. The control unit subtracts the rectangle-shaped waveform components from the sensor outputs to extract noise components representing a degree of the catalyst deterioration.

System for detecting deterioration of a purifier utilizing a non-linear filter

A control system for a plant is disclosed. According to this system, a model parameter vector of a controlled object model which is obtained by modeling the plant, is identified. A controller controls the plant using the identified model parameter vector. An identifying error of the model parameter vector is calculated, and the calculated identifying error is limited in a predetermined range. An updating vector is calculated according to the limited identifying error. The model parameter vector is calculated by adding the updating vector to a reference vector of the model parameter vector.

A control system for a plant is disclosed. In this control system, a model parameter vector of a controlled object model which is obtained by modeling said plant, is calculated. A sliding mode controller is included in the control system. The sliding mode controller controls the plant using the identified model parameter vector. A damping input is calculated according to a speed of change in an output of the plant, and an element of the model parameter vector. A control input form the sliding mode controller to the plant includes the calculated damping input.

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Wako, Japan

Eiji Hashimoto