Abstract: A control apparatus for an internal combustion engine according to the invention is applied to an internal combustion engine that is equipped with an exhaust gas treatment device that is provided in an exhaust passage, and a burner device that is provided in the exhaust passage upstream of the exhaust gas treatment device so as to raise a temperature of exhaust gas supplied to the exhaust gas treatment device. The control apparatus performs an increase control for increasing a concentration of oxygen in exhaust gas supplied to the burner device if the concentration of oxygen is not higher than a predetermined required concentration of oxygen when there is a request to operate the burner device. The combustion performance of the burner device is stably ensured by securing or compensating for an insufficient concentration of oxygen.

Abstract: An operation control apparatus for an internal combustion engine includes: an exhaust emission purifier; a fuel supplying valve for supplying fuel to an exhaust passage; ignition means for igniting the fuel supplied; a warm up determining section for determining whether or not the purifier need be warmed; an exhaust heating determining section for determining whether or not the engine is in an operational state in which the fuel should be ignited and burned; an exhaust heating predicting section for predicting the transition from the operational state in which the fuel should not be ignited and burned to an operational state in which the fuel should be ignited and burned; and a heat generation temperature setting section for setting the temperature of a heating portion of the ignition means based on the result by the heating determining section and the predicting section.

Abstract: There is provided an operation control method for an internal combustion engine, in which if an exhaust gas purifier needs to be warmed, a second glow plug is heated in an exhaust passage upstream of the purifier to a fuel ignition temperature or higher while fuel supplied to the exhaust passage is ignited and burned. In this method, if it is determined that the purifier and an engine need to be warmed, a first glow plug disposed in a combustion chamber is first heated to a predetermined temperature prior to the warm-up of the purifier to start the warm-up of the engine, and then the second glow plug begins to be heated when the temperature of the purifier is equal to or higher than a glow plug energization starting temperature which is lower than a warm-up start determination temperature of the purifier.

Abstract: An operation control apparatus for an internal combustion engine includes: an exhaust emission purifier; a fuel supplying valve for supplying fuel to an exhaust passage; ignition means for igniting the fuel supplied; a warm up determining section for determining whether or not the purifier need be warmed; an exhaust heating determining section for determining whether or not the engine is in an operational state in which the fuel should be ignited and burned; an exhaust heating predicting section for predicting the transition from the operational state in which the fuel should not be ignited and burned to an operational state in which the fuel should be ignited and burned; and a heat generation temperature setting section for setting the temperature of a heating portion of the ignition means based on the result by the heating determining section and the predicting section.

Abstract: An apparatus that raises temperature of a post-catalyst at an early time while suppressing reducing agent poisoning of the post-catalyst and discharge of a reducing agent into the outside when a pre-catalyst and the post-catalyst are arranged in series in an exhaust passage of an internal combustion engine in order from an upstream side thereof. The pre-catalyst is arranged to allow an exhaust gas to flow between an outer peripheral surface thereof and an inner peripheral surface of the exhaust passage. A reducing agent addition valve adding a reducing agent to allow the reducing agent to pass through the pre-catalyst is arranged immediately upstream of the pre-catalyst in the exhaust passage. Further, a retention catalyst is arranged in the exhaust passage between the pre-catalyst and the post-catalyst, to temporarily retain the reducing agent in the exhaust gas.

Abstract: A control apparatus for an internal combustion engine according to the invention is applied to an internal combustion engine that is equipped with an exhaust gas treatment device that is provided in an exhaust passage, and a burner device that is provided in the exhaust passage upstream of the exhaust gas treatment device so as to raise a temperature of exhaust gas supplied to the exhaust gas treatment device. The control apparatus performs an increase control for increasing a concentration of oxygen in exhaust gas supplied to the burner device if the concentration of oxygen is not higher than a predetermined required concentration of oxygen when there is a request to operate the burner device. The combustion performance of the burner device is stably ensured by securing or compensating for an insufficient concentration of oxygen.

Abstract: An exhaust gas control device of an internal combustion engine has an exhaust treatment device that purifies an exhaust gas. The exhaust gas control device is formed such that unburned fuel is supplied into the exhaust gas by a fuel addition valve, and the unburned fuel is ignited by a glow plug, to generate thereby a flame that reaches an upstream end of an exhaust treatment device. The unburned fuel is caused to become adhered to the upstream end of the exhaust treatment device before a generated flame reaches the exhaust treatment device. Then, the unburned fuel adhered to the upstream end of the exhaust treatment device burns by the flame.

Abstract: A method according to the present invention of heating exhaust gas to be introduced into an exhaust gas purifying device from an internal combustion engine by heating and igniting fuel supplied into an exhaust passage from a fuel supply valve includes the steps of determining a necessity for supplying fuel into the exhaust passage, setting an amount of fuel to be supplied into the exhaust passage from the fuel supply valve, the amount being set when it is judged in the determining step that fuel needs to be supplied into the exhaust passage, checking an operating state of the engine, and controlling an air-fuel ratio of exhaust gas such that the air-fuel ratio falls within an area where amounts of both smoke and HC to be generated in the exhaust gas are low in the operating state of the engine checked in the checking step.

Abstract: A method according to the present invention heats exhaust introduced to an exhaust emission purifier by injecting fuel into an exhaust passage through a fuel addition valve toward a heat generating portion of a glow plug disposed in the exhaust passage located upstream of the exhaust emission purifier, and then igniting the fuel. In the method, a rate of the fuel injected through the fuel addition valve which directly contacts the heat generating portion is set to between 8% and 55%.

Abstract: An exhaust purification system of an internal combustion engine, having an exhaust purification catalyst in the exhaust passage of the engine of a vehicle, a fuel supply device provided in the exhaust passage upstream the exhaust purification catalyst and supplies fuel to an exhaust gas flowing into the catalyst, a heating device which heats the fuel supplied from the fuel supply device, and a controller which controls the heating device. The controller controls the heating device, when a first processing request based on a state of the exhaust purification catalyst is standing and a second processing request based on an operating state of the vehicle is not standing (t2), to a pre-heating temperature lower than an ignition threshold capable of igniting the fuel and, when the first processing request and the second processing request are standing (t3), to an ignition temperature higher than the ignition threshold.

Abstract: A reducing agent addition valve is arranged in a position in which at least part of a reducing agent added to an exhaust gas in an exhaust passage at a location upstream of a precatalyst reaches the precatalyst in the state of liquid, and the reducing agent is supplied in a more suitable state to an exhaust gas purification device which is arranged in the exhaust passage at a downstream side of the precatalyst. When the addition of the reducing agent is performed by the reducing agent addition valve, the flow rate of the exhaust gas flowing into the precatalyst is decreased so that at least part of the reducing agent, which has reached the precatalyst and has vaporized in the precatalyst, is caused to flow back.

Abstract: An exhaust purification system of an internal combustion engine is provided with an exhaust treatment device which purifies exhaust, a fuel feed device which is arranged at an upstream side from the exhaust treatment device and which feeds fuel to the engine exhaust passage, an ignition device which causes fuel which is fed from the fuel feed device to ignite, and a flow regulating device which regulates the flow rate of exhaust gas which flows toward the ignition device. The fuel feed device is formed so as to feed liquid fuel. The system has an operating region in which due to the fuel which is fed to the engine exhaust passage burning, backflow of the exhaust gas occurs. Fuel is made to burn in the operating region. Further control is performed to make the flow rate of the exhaust gas increase during the period from when combustion of fuel should be started to when combustion of the fuel ends.

Abstract: An internal combustion engine in an engine exhaust passage of which an exhaust purification catalyst (13) having an oxidation function is arranged and in the engine exhaust passage upstream of the exhaust purification catalyst (13) of which a small-sized oxidation catalyst (14) and a fuel feed valve (15) for feeding fuel to the small-sized oxidation catalyst (14) are arranged. When activating the exhaust purification catalyst (13), the fuel fed from the fuel injector (15) is used to heat the small-sized oxidation catalyst (14) and when the exhaust purification catalyst (13) is further raised in temperature, the fuel fed from the fuel feed valve (15) is increased and reformed fuel is exhausted from the small-sized oxidation catalyst (14).

Abstract: The present invention provides an exhaust purifying apparatus in an internal combustion engine provided with an exhaust treatment device in an exhaust passage. The exhaust purifying apparatus comprises an oxidation device provided upstream of the exhaust treatment device, a fuel adding valve for adding fuel upstream of the oxidation device, and a glow plug provided upstream of the oxidation device for heating the fuel added from the fuel adding valve. The oxidation device is formed to be provided with gas passages the number of which is equal to or more than 30 and is equal to or less than 200 per 0.00064516 m2 in an exhaust flow passage direction cross-section.

Abstract: A technique is provided which is capable of reducing an amount of smoke generated in a temperature raising system in which fuel added to an exhaust gas flowing through an exhaust passage is caused to combust at the time of requesting a temperature rise in an exhaust gas purification catalyst. When a request for raising the temperature of an exhaust gas purification catalyst is made, bypass control is carried out in which the exhaust gas having bypassed a turbine is caused to flow into the exhaust gas purification catalyst through a bypass passage, and fuel ignition control is carried out in which a fuel addition valve is caused to add fuel to the exhaust gas which has flowed out of the turbine, and a glow plug is caused to ignite the added fuel.

Abstract: An object is to provide a technology with which the temperature of exhaust gas can be raised with improved efficiency in cases where a catalyst apparatus including a catalyst having an oxidizing ability is provided in an exhaust passage of an internal combustion engine. According to the present invention, a catalyst apparatus 6 that is provided in the exhaust passage 1 of the internal combustion engine and to which reducing agent is supplied from upstream when the temperature of the exhaust gas is to be raised is equipped with at least first and second catalysts 4, 5 having an oxidizing ability. The first catalyst 4 is configured in such a way that the exhaust gas flows through a gap between its outer circumferential surface and the inner circumferential surface of the exhaust passage. The second catalyst 5 is disposed downstream of the first catalyst 4 with a space 10 having a specific width Ws between it and the first catalyst 4.

Abstract: An exhaust heating apparatus has a housing defining a firing chamber jointed to an exhaust pipe, a fuel supply valve for injecting fuel to the firing chamber communicated with the exhaust passage through a junction port, a glow plug for igniting the injected fuel. A part of the exhaust gas flowing in the exhaust passage flows into the firing chamber and again flowing out to the exhaust passage together with a combustion gas generated in the firing chamber. An angle between a wall surface in the exhaust pipe positioned upstream of the junction port and an upstream wall surface in the housing, and an angle between a wall surface in the exhaust pipe positioned downstream of the junction port and a downstream wall surface in the housing, are set to an obtuse angle, respectively.

Abstract: An object of the present invention is to prevent an excessive temperature rise of a precatalyst in the case where the precatalyst is provided in the exhaust passage upstream of an exhaust gas purification apparatus and has a heat capacity smaller than that of the exhaust gas purification apparatus, and reducing agent is added from a reducing agent addition valve toward an upstream end surface of the precatalyst. According to the present invention, the reducing agent addition valve is located in such a way that the reducing agent added through it reaches the precatalyst in a liquid state.

Abstract: An exhaust purification system of an internal combustion engine, having an exhaust purification catalyst in the exhaust passage of the engine of a vehicle, a fuel supply device provided in the exhaust passage upstream the exhaust purification catalyst and supplies fuel to an exhaust gas flowing into the catalyst, a heating device which heats the fuel supplied from the fuel supply device, and a controller which controls the heating device. The controller controls the heating device, when a first processing request based on a state of the exhaust purification catalyst is standing and a second processing request based on an operating state of the vehicle is not standing (t2), to a pre-heating temperature lower than an ignition threshold capable of igniting the fuel and, when the first processing request and the second processing request are standing (t3), to an ignition temperature higher than the ignition threshold.

Abstract: An exhaust gas control apparatus includes an oxidation catalyst, a compact oxidation catalyst having a smaller cross section than that of an engine exhaust passage, a fuel supply valve, a glow plug, and an electronic control unit. The control modes for the exhaust gas control apparatus include a first control mode where the fuel is supplied from the fuel supply valve, heated by the glow plug, and ignited, a second control mode where the fuel is supplied from the fuel supply valve, and heated by the glow plug but is not ignited, and a third control mode where the fuel is supplied from the fuel supply valve and the glow plug does not provide heating. The electronic control unit selects the first or third control mode in the operation region where ignition is possible, and selects the second or third control mode in the operation region where ignition is not possible.