Abstract: In an exhaust emission purifying apparatus for an internal combustion engine, for adding a reducing agent for NOx to the exhaust gas to thereby purify NOx in the exhaust gas, the mixing of the reducing agent injected by an injection nozzle with the exhaust gas is accelerated. To this end, in the apparatus of the present invention, the injection nozzle for the urea water is disposed to be opposite to the flow of the exhaust gas, or to face upward in a vertical direction.

Abstract: A breather device A1 for pressure relief includes a breather pipe 121 serving as a fixing part, and an inner pipe 122 serving as a communication part and is provided by the breather pipe 121 with fixation strength enough for securing the breather device A1 to a liquid tank 101. The inner pipe 122 has a vent hole P formed therein for provide fluid-communication between the inside of the liquid tank 101 and the outside thereof in a manner such that an inner surface forming the vent hole P is made of a resin.

Abstract: A reducing agent container having a multi-function and having a container body thereof is provided with at least a heat exchanger which permits a heating medium using an engine as a heat source thereof to circulate therein for performing the heat exchange with a liquid reducing agent and a strainer which filtrates foreign substances from the liquid reducing agent, the heat exchanger and the strainer being attached to a top board of the container body. Further, a suction pipe capable of sucking the liquid reducing agent from the inside of the container body is connected to the strainer, and a supply port for the liquid reducing agent from which the foreign substances are filtrated is formed in the strainer. Thus, the whole of strainer is not exposed to the outside air, especially, the wind during traveling, and accordingly, the freezing of the urea aqueous solution in the strainer can be suppressed.

Abstract: A liquid reducing agent container structure adapted for an exhaust emission purifying system that is capable of reductively purifying NOx in the exhaust gas using a liquid reducing agent, and provided with a configuration such that a lock (42, 60, 70) is detachably disposed on the outer face of an inlet port (34) disposed on a container body (24A) of a reducing agent container (24), and an engagement portion (36a, 50, 54, 56, 58) with which a locking member (42d, 60d, 70b) of the lock (42, 60, 70) can be engaged is disposed on the side of a cap member (36) which is configured to be screwed on the inlet port (34) to seal the inlet port (34), thereby engaging the locking member (42d, 60d, 70b) with the engagement portion (36a, 50, 54, 56, 58) with a locking operation by the lock (42, 60, 70) to block and prevent a rotation of the cap member (36).

Abstract: An apparatus for distinguishing a liquid reducing agent which judges empty with a higher precision than heretofore is provided. The apparatus for distinguishing a liquid reducing agent is provided with a concentration sensor and a liquid-level sensor in storage tank of liquid reducing agent, and is characterized in that empty is judged by utilizing the liquid-level based on the liquid-level sensor in addition to the concentration based on the concentration sensor (step 3 and step 5). Even if a bubble is adhering to the concentration sensor and an erroneous signal indicative of empty is output although the residual quantity of liquid reducing agent is sufficient, the liquid-level sensor does not output a signal indicative of empty. Consequently, erroneous judgment is prevented and accurate judgment can be made as compared to heretofore.

Abstract: Secure failure of a brake switch is enabled with a simple configuration. When brake switches 6a and 6b are determined to be not ON together and not OFF together (S110 and S112), first and second determination counters perform count respectively (S114 and S120), and on the other hand, when the two brake switches 6a and 6b are determined to be ON together, a count value of the first determination counter is set to zero (S132), and when the brake switches are determined to be OFF together, a count value of the second determination counter is set to zero (S136), those operation being periodically repeated, and when one of the count values of the first and second determination counters exceeds one of respective predetermined values ? and ? (S118 and S214), one of the two brake switches 6a and 6b is determined to be failed, which enables detection of a failure state that one of the brake switches is normally ON or normally OFF.

Abstract: According to the invention, erroneous learning of an accelerator pedal fully-closed position is reliably detected, problems originating from the erroneous learning are prevented from arising, and further improvements in reliability of vehicle motion are achieved.

Abstract: An engine exhaust emission purification apparatus for reducing and purifying NOx in the exhaust emission by using a liquid reducing agent having a temperature maintenance device for maintaining a temperature of at least a part of a liquid reducing agent supply system configured by an injection nozzle and piping of the injection nozzle at a temperature lower than a boiling point of a solvent of the liquid reducing agent or equal to or higher than a melting point of dissolved matter in which the liquid reducing agent existing in the liquid reducing agent supply system conducts heat exchange with the liquid reducing agent supply system thereby being maintained at a temperature lower than the boiling point of the solvent or equal to or higher than the melting point of the dissolved matter and resultantly, occurrence of precipitation of the dissolved matter due to evaporation of only the solvent in the liquid reducing agent supply system does not occur, and even if precipitation of the dissolved matter occurs, the

Abstract: A reduction catalyst is disposed in an exhaust passage of an engine. A reducing agent added to the exhaust gas is urged to react with NOx in the exhaust gas, catalyzed by the reduction catalyst. A member for distributing the exhaust gas to which the reducing agent has been added is provided. This member is formed by applying of an axial welding and is disposed in the exhaust passage such that the internal surface of its joining portion is disposed to overhang from the topmost position of the joining portion.

Abstract: An exhaust emission purifying apparatus for an engine, which is provided with: an electric pump sucking and supplying a liquid reducing agent by pumping out of a reducing agent tank; a flow control valve controlling flow rate of the liquid reducing agent; and an injection nozzle injection-supplying the liquid reducing agent with the controlled flow rate, to an exhaust emission upstream of NOx reduction catalytic converter. At the engine starting, a highly pressurized air is urged to reversely flow to a reducing agent supply system upstream of the flow control valve. Then it is determined whether or not the reducing agent supply system brings about clogging based on a pressure change produced by the reverse flow. When a number of frequency at which it is consecutively determined as occurrence of clogging reaches a predetermined number or more, it is determined that the clogging is serious, which is unable to be readily mended.

Abstract: On the basis of a correlation between exhaust gas temperature detected by an exhaust gas temperature sensor and exhaust gas temperature estimated according to an engine operating condition, it is detected whether or not abnormality occurs in the exhaust gas temperature sensor. Namely, when a change characteristic of the detected exhaust gas temperature follows a change characteristic of the estimated exhaust gas temperature, it is determined that the exhaust gas temperature sensor is normal. On the other hand, when the change characteristic of the detected exhaust gas temperature does not follow that of the estimated exhaust gas temperature, it is determined that the exhaust gas temperature sensor is abnormal.

Abstract: A water level measuring apparatus and a water level measuring method, in which a water level L0 of a liquid is read from a water level indicator secured to a liquid tank, and a filter value FLT is calculated by applying a filter with a time constant greater than one second to the water level L0. Furthermore when the filter value FLT is less than a minimum value Min, the minimum value Min is sequentially updated with the filter value FLT. Then the minimum value Min is output as the final water level L. Accordingly, even if the surface sloshes and the water level L0 fluctuates up and down, by adopting the minimum value that utilizes the characteristic of the surface fluctuations, as the final water level L, there is little influence of the liquid sloshing, and the water level measurement accuracy can be improved.

Abstract: When a concentration measured by a sensor is lower than a predetermined threshold, it is judged that a liquid is any different type of aqueous solution, and also, it is judged whether or not the different type discrimination is adequate. When the discrimination is adequate, the number of different type discriminating times is counted up based on a predetermined counted value, and when the number thereof is equal to or larger than a determination threshold, the different type discrimination is determined. At this time, at least one of the predetermined counted value and the determination threshold is dynamically set based on a liquid level of a reducing agent tank, so that the counting and/or the different type discriminating determination is performed considering convection which is changed according to a level change to thereby discriminate with high precision whether or not the liquid is the different type of aqueous solution.

Abstract: A temperature-sensitive type urea sensor 74 is adopted for use in an engine exhaust gas purifying apparatus. The magnitude of convection of urea aqueous solution generated in a storage tank 41 is determined based on temperature information detected by the urea sensor 74. For detection of abnormality, a detected concentration Dn is adopted when the percentage GRDt of temperature change of urea aqueous solution is small, so that convection is small and it is determined not to affect accurate detection of an abnormality.

Abstract: In order to suppress deposition of constituent of a reducing agent (dissolved matter) in an exhaust passage of an engine enhancing an elimination rate of NOx even when temperature of an exhaust emission from the engine is low, an exhaust emission purifying apparatus is provided with an electro-generative-heat carrier provided on an upstream side of an injection nozzle that supplies the reducing agent into the exhaust emission on upstream side of a reduction catalyst in an exhaust pipe, the exhaust emission being heated to a temperature equal to or higher than a melting point of the dissolved matter whereby deposition of the dissolved matter on an inner wall surface of the exhaust pipe is suppressed to effectively use the supplied reducing agent for catalytic reduction reaction, even when the exhaust emission temperature is lower than the melting point of the dissolved matter of the reducing agent.

Abstract: In an exhaust emission purifying apparatus for an internal combustion engine, for adding a reducing agent for NOx to the exhaust gas to thereby purify NOx in the exhaust gas, the mixing of the reducing agent injected by an injection nozzle with the exhaust gas is accelerated. To this end, in the apparatus of the present invention, the injection nozzle for the urea water is disposed to be opposite to the flow of the exhaust gas, or to face upward in a vertical direction.

Abstract: A breather device A1 for pressure relief includes a breather pipe 121 serving as a fixing part, and an inner pipe 122 serving as a communication part and is provided by the breather pipe 121 with fixation strength enough for securing the breather device A1 to a liquid tank 101. The inner pipe 122 has a vent hole P formed therein for provide fluid-communication between the inside of the liquid tank 101 and the outside thereof in a manner such that an inner surface forming the vent hole P is made of a resin.

Abstract: In an exhaust emission purifying apparatus for reductively purifying NOx in the exhaust emission by using a liquid reducing agent or its precursor, to be referred to as “liquid reducing agent” herein, a dosing flow rate of the liquid reducing agent according to engine operating conditions is computed, and the dosing of the liquid reducing agent is controlled based on the computed dosing flow rate, and also, it is judged whether or not a supply system of the liquid reducing agent is failed, based on a ratio between an integrated amount obtained by sequentially integrating the dosing flow rate and a consumed amount of the liquid reducing agent.

Abstract: In relation to an exhaust gas purification system that mixes a liquid reducing agent with air and injection-supplies this mixture into an exhaust gas flowing on an upstream side of a reduction catalyst (20) to thereby effect reduction purification of NOx in exhaust gas, a technical attention is directed to the relation of respective elements of; the travel distance, the fuel consumption, the air consumption, or the running time and the like, and the liquid reducing agent consumption, to constitute a configuration such that a continual monitor as to whether the injection condition of liquid reducing agent is normal or abnormal is executed by judging whether or not the amount of liquid reducing agent consumed for a predetermined travel distance, a predetermined fuel consumption, a predetermined air consumption, or a predetermined running time, is within a predetermined range.

Abstract: A breather device A1 for pressure relief includes a breather pipe 121 serving as a fixing part, and an inner pipe 122 serving as a communication part and is provided by the breather pipe 121 with fixation strength enough for securing the breather device A1 to a liquid tank 101. The inner pipe 122 has a vent hole P formed therein for provide fluid-communication between the inside of the liquid tank 101 and the outside thereof in a manner such that an inner surface forming the vent hole P is made of a resin.