摘要:
A device for purifying exhaust gas includes an HC adsorbent and an exhaust gas purifying catalyst disposed in an exhaust gas passage in this order from the upstream side. The exhaust gas purifying catalyst is provided with an O.sub.2 storage capability, i.e., the exhaust gas purifying catalyst is capable of absorbing oxygen in the exhaust gas when the air-fuel ratio of the exhaust gas is lean, and is capable of releasing the absorbed oxygen when the air-fuel ratio of the exhaust gas becomes rich. When the engine starts, the HC adsorbent adsorbs HC in the exhaust gas. When the temperature of the exhaust gas becomes high, the HC adsorbent releases the adsorbed HC. The device also includes an engine control unit which operates the engine at a lean air-fuel ratio during a predetermined period before the releasing of the HC from the HC adsorbent occurs. Therefore, oxygen is absorbed and stored in the exhaust gas purifying catalyst before the releasing of HC occurs. When the releasing of HC from the HC adsorbent occurs, the air-fuel ratio of the exhaust gas flowing into the exhaust gas purifying catalyst becomes rich due to the HC released from the HC adsorbent. This causes the exhaust gas purifying catalyst to release the absorbed oxygen, and the HC in the exhaust gas is purified by the exhaust gas purifying catalyst using the released oxygen.
摘要:
A device for purifying the exhaust gas of an engine having a plurality of cylinders divided into first and second cylinder groups, the first and the second cylinder groups being connected to first and second exhaust passage, respectively, and performing a lean operation, comprises an NH.sub.3 synthesizing catalyst arranged in the first exhaust passage, and an exhaust gas purifying catalyst arranged in an interconnecting passage, which interconnects the first passage downstream of the NH.sub.3 synthesizing catalyst and the second exhaust passage, for purifying the inflowing NO.sub.X and NH.sub.3. An additional engine performing a rich operation is provided and the exhaust gas thereof is fed to the first exhaust gas passage upstream of the NH.sub.3 synthesizing catalyst to make the exhaust gas air-fuel ratio of the exhaust gas flowing into the NH.sub.3 synthesizing catalyst rich, to thereby synthesize NH.sub.3 therein. An amount of NH.sub.3 or NO.sub.X flowing into the exhaust gas purifying catalyst is obtained, and the additional engine is controlled in accordance with the obtained NH.sub.3 or NO.sub.X amount to control the amount of the reducing agent flowing to the exhaust gas purifying catalyst.
摘要:
Disclosed is a technology of diagnosing an exhaust gas purifying apparatus about a fault in its temperature control function of controlling a temperature of an exhaust gas purifying catalyst. The exhaust gas purifying apparatus for an internal combustion engine includes the exhaust gas purifying catalyst, and a temperature control means for controlling the temperature of this exhaust gas purifying catalyst. The exhaust gas purifying apparatus is judged to be faulted, wherein at least one of a state of the temperature control means and a state of the exhaust gas purifying catalyst serves as a parameter.
摘要:
A fuel control apparatus (100) for an internal combustion engine in a vehicle, the vehicle provided with: the internal combustion engine (200) provided with a fuel supply apparatus (208, 209) capable of supplying, as fuel, first fuel (liquid fuel) and second fuel (CNG) in which amount of a reducing agent in an exhaust air under an rich air-fuel ratio is greater than that in the first fuel; and an exhaust purification apparatus (300, 400) disposed in an exhaust passage of the internal combustion engine, the fuel control apparatus provided with: a first controlling device for controlling the fuel supply apparatus such that the supply of the fuel is temporarily stopped under a predetermined condition; and a second controlling device for controlling the fuel supply apparatus such that the second fuel is supplied as the fuel and such that an exhaust air-fuel ratio is the rich air-fuel ratio, if the supply of the fuel is restarted from a state in which the supply of the fuel is temporarily stopped.
摘要:
The present invention has an object to put into practical use an air purification system for a vehicle, which incorporates an ozone purifier formed to contain an activated carbon. The air purification system for a vehicle provided by the present invention includes an ozone purifier that is formed to contain an activated carbon therein and disposed on a surface of a vehicle component disposed at a position at which an air flow path is formed while the vehicle is running. The air purification system for a vehicle also includes a purification inhibitor remover that is disposed upstream of the ozone purifier in the above-described flow path, for removing a component inhibiting purification of ozone by the ozone purifier, from the air flowing into the ozone purifier. The ozone purifier may, for example, be disposed on a radiator and the purification inhibitor remover on a condenser or a sub-radiator.
摘要:
A method for estimating the amount of heat received by refrigerant by an ECU comprises a step for detecting an estimation factor including the intake air amount of an internal combustion engine, and a step for estimating the amount of heat received from exhaust gas by cooling water of the internal combustion engine in a water-cooled exhaust manifold based on a detected estimation factor. Preferably, the estimation factor further includes at least any one of the cooling water temperature, the intake air temperature of the internal combustion engine, or the number of revolutions of the internal combustion engine.
摘要:
A fuel control apparatus (100) for an internal combustion engine in a vehicle, the vehicle provided with: the internal combustion engine (200) provided with a fuel supply apparatus (208, 209) capable of supplying, as fuel, first fuel (liquid fuel) and second fuel (CNG) in which amount of a reducing agent in an exhaust air under an rich air-fuel ratio is greater than that in the first fuel; and an exhaust purification apparatus (300, 400) disposed in an exhaust passage of the internal combustion engine, the fuel control apparatus provided with: a first controlling device for controlling the fuel supply apparatus such that the supply of the fuel is temporarily stopped under a predetermined condition; and a second controlling device for controlling the fuel supply apparatus such that the second fuel is supplied as the fuel and such that an exhaust air-fuel ratio is the rich air-fuel ratio, if the supply of the fuel is restarted from a state in which the supply of the fuel is temporarily stopped.
摘要:
When fuel supply is stopped while an engine is decelerating, pressure in each cylinder is detected using a pressure sensor, and the peak value of the pressure in each cylinder is determined. Also, an intake air amount is detected when the fuel supply is stopped, and the allowable range of the peak value is calculated based on the intake air amount. When the peak value of the pressure in a cylinder is in the allowable range, it is determined that a charged air amount in the cylinder is in a target amount range. When the peak value of the pressure in a cylinder is out of the allowable range, it is determined that the charged air amount in the cylinder is out of the target amount range, and a warning device is operated.
摘要:
When fuel supply is stopped while an engine is decelerating, pressure in each cylinder is detected using a pressure sensor, and the peak value of the pressure in each cylinder is determined. Also, an intake air amount is detected when the fuel supply is stopped, and the allowable range of the peak value is calculated based on the intake air amount. When the peak value of the pressure in a cylinder is in the allowable range, it is determined that a charged air amount in the cylinder is in a target amount range. When the peak value of the pressure in a cylinder is out of the allowable range, it is determined that the charged air amount in the cylinder is out of the target amount range, and a warning device is operated.
摘要:
A rapid catalyst warm-up control device for an internal combustion engine performs irregular injection dither control during the rapid catalyst warm-up control after starting the engine. In the irregular injection dither control, injection modes are switched after every fuel injection to the cylinders (every 180° CA for a 4-cylinder engine) between a lean injection mode and a rich injection mode in such a pattern that rich injections will not occur consecutively for the same cylinder (dither cycle=540° CA, 900° CA, 1080° CA, or the like). In the lean injection mode, fuel is injected such that the air-fuel ratio is leaner than the stoichiometric ratio, and in the rich injection mode, air-fuel ratio is richer than the stoichiometric ratio. The rich gas emitted from the cylinders where the rich injection has been performed is thus allowed to flow through a different catalyst region every time instead of flowing only through the same region.