摘要:
An exhaust gas purifying apparatus for an internal-combustion engine, including a three-way catalyst, nitrogen oxide purifier that is disposed downstream of the three-way catalyst, an upstream oxygen sensor that is disposed between the three-way catalyst and the nitrogen oxide purifier, and a downstream oxygen sensor that is disposed downstream of the nitrogen oxide purifier. An abnormality determination criterion is set in accordance with the exhaust gas amount of the internal-combustion engine wherein the criterion is equivalent to a time period until the output of the downstream oxygen density sensor is read since the output of the upstream oxygen density sensor is changed to rich after the air-fuel ratio of the exhaust gas was over from lean to rich. Any abnormality of the nitrogen oxide purifier is determined when the output of the downstream oxygen density sensor has been changed to rich before the time period represented by the criterion elapses.
摘要:
The control system of the present invention is provided for a hybrid vehicle with an engine, a motor, and a power storage unit. The control system selects one of an air intake passage pressure assist mode (PB assist mode) corresponding to a partial load range of the engine and a throttle assist mode corresponding to the opening state of a throttle. The control system comprises: an assist mode determining device for determining whether the vehicle is in the PB assist mode or in the throttle assist mode, based on the opening state of a throttle; a PB assist amount determining device for determining a base assist amount in the PB assist mode, based on the rotational speed of the engine and an air intake passage pressure (PB); a throttle assist amount determining device for determining the base assist amount in the throttle assist mode, based on the rotational speed of the engine, the base assist amount including a range defined by an upper threshold value and a lower threshold value; and a throttle assist amount changer for gradually changing the assist amount determined by the throttle assist amount determining device between the upper threshold value and the lower threshold value when the vehicle runs through a partial load range to a full load range of the engine.
摘要:
A system according to the invention controls the vaporized amount of a blended fuel composed of gasoline and an alcohol such as methanol and contained in a fuel tank mounted at a vehicular internal combustion engine. The methanol concentration in the fuel is sensed and from the sensed value, reid vapor pressure of the fuel is presumed. The pressure in the fuel tank is then regulated at a target pressure by adjusting the amount of vaporized fuel to be removed from the fuel tank and fed to a canister in response to the presumed reid vapor pressure.
摘要:
An air-fuel ratio control method controls the air-fuel ratio of an air-fuel mixture supplied to an internal combustion engine having spark plugs, and heaters for heating the air-fuel mixture in the vicinity of respective ones of the heaters, the air-fuel mixture containing a fuel which is poor in atomizing characteristic at a low temperature. The method comprises the steps of (1) determining whether or not a temperature of the engine is lower than a predetermined value, (2) determining whether or not the engine is being cranked, (3) detecting an amount of electric current flowing through each of the heaters, and (4) controlling an amount of fuel supplied to the engine based on the detected amount of electric current when it is determined that the temperature of the engine is lower than the predetermined value and at the same time the engine is being cranked.
摘要:
A storage capacity management system for a battery provided in a vehicle having an electric motor as a drive source includes a deteriorated state estimating unit that estimates a deteriorated state of the battery, a zone setting unit that sets a storage capacity where the battery can be used into a plurality of zones in accordance with a deteriorated state of the battery, a charged state calculating unit that calculates a charged state of the battery, a zone determination unit that determines to which zone of the plurality of zones set by the zone setting unit the charged state of the battery belongs, and a control instructing unit that instructs to execute a control associated with the charge or discharge of the battery in accordance with the zone determined by the zone determination unit.
摘要:
A control apparatus for a hybrid vehicle of the present invention determines whether a brake switch flag F_BKSW is “1” or not (step S101), and in the case where the brake is on (“yes”), obtains a deceleration regeneration computation value DECRGN by table retrieval from a #REGENBR table. In the case where the brake is off (“no”), it is determined whether a fuel supply cut delay time regeneration flag F_RGNFCD is “1” or not (step S104). In the case where regeneration is not performed in the fuel supply cut delay time (“no”), a deceleration regeneration computation value DECRGN is obtained by table retrieval from a #REGEN table (step S105). On the other hand, in the case where regeneration is performed in the fuel supply cut delay time (“yes”), a deceleration regeneration computation value DECRGN is obtained by table retrieval from a #RGNNFCD table (step S106).
摘要:
A air-fuel control system for internal combustion engines using a blended fuel composed of gasoline and alcohol for determining or presuming a correction factor due to alcohol concentration in the fuel when an alcohol sensor for detecting the same has failed. An average value of the O.sub.2 feedback correction factor reflecting a deviation between a target air fuel ratio and an actual air-fuel ratio is obtained and based on it, a target value is determined. The average value is compared with upper and lower limits and when it reaches either one, the factor obtained when the sensor operated properly is adjusted by an amount to follow up the target value.
摘要:
A fuel-vapor purge and air-fuel ratio control system controls the amount of fuel vapor to be purged under an engine vacuum into a carburetor of an automotive engine from a charcoal canister and also controls the air-fuel ratio of an air-fuel mixture to be supplied to the carburetor. The fuel vapor is purged form the charcoal canister by applying the engine vacuum to the charcoal canister only when the air-fuel ratio is controlled. The applied engine vacuum may be regulated to control the amount of purged fuel vapor to change in proportion to the amount of air drawn by the engine, or the amount of purged fuel vapor may be increased to an upper limit when the air-fuel ratio is in a normal air-fuel ratio control region, and the amount of purged fuel vapor may be reduced to a lower limit when the air-fuel ratio is outside the normal air-fuel ratio control region. Alternatively, the controlling of the air-fuel ratio may forcibly be brought to a central value of an air-fuel ratio control range when purged fuel vapor is cut off of the amount of purged fuel vapor is abruptly reduced.
摘要:
An exhaust gas purifying apparatus for an internal-combustion engine includes an exhaust gas purifier having a nitrogen oxide purifier for purifying nitrogen oxide contained in exhaust gases and an oxygen density sensor located downstream of the exhaust gas purifier. The apparatus further includes a sulfur oxide detector for detecting the density of sulfur oxide in the exhaust gas purifier, a sulfur-poisoning recovery apparatus for recovering the exhaust gas purifier from sulfur poisoning when the sulfur oxide detector determines the sulfur oxide density is high, a lean operation limiter for limiting the lean operation of the engine to such operation region that is not influenced so much by the sulfur poisoning after the exhaust gas purifier has been recovered from the sulfur poisoning, and a deterioration determiner for determining deterioration of the exhaust gas purifier based on the output of the oxygen density sensor during the lean operation of the engine.
摘要:
A control device for a hybrid vehicle provided with an engine and a motor as driving sources, and a storage battery device which stores regenerative energy obtained by output from the engine or by regenerative operation of the motor during deceleration of the vehicle. The control device includes: a vehicle speed detection unit which detects speed of the vehicle; a deceleration fuel cut determination unit which determines whether supply of fuel to the engine is stopped during deceleration of the vehicle; and a brake detection unit which detects operation of a brake, wherein regenerative braking is stopped when operation of the brake is detected by the brake detection unit if the vehicle speed detected by the vehicle speed detection unit is lower than a predetermined speed and if it is determined by the deceleration fuel cut determination unit that the supply of fuel to the engine is not stopped.