Abstract: A control system for a hybrid vehicle, which enables the hybrid vehicle to optimally selectively use driven modes to attain excellent fuel economy and thereby make it possible to improve fuel economy. The hybrid vehicle is operated in an engine-driven mode or a motor-driven mode, and recovers electric energy for driving an electric motor, using the output from the engine. The control system calculates a driving fuel consumption amount of the engine required for driving the hybrid vehicle in the engine-driven mode and a recovering fuel consumption amount of the engine required for recovering electric energy to be consumed when the hybrid vehicle is driven in the motor-driven mode, and sets the driven mode to the motor-driven mode when the recovering fuel consumption amount is smaller than the driving fuel consumption amount, and to the engine-driven mode when the former is larger than the latter.

Abstract: A cylinder operation control apparatus includes: an internal combustion engine (E) which is adapted to operate in an all-cylinder activation mode and in a cylinder deactivation mode; a lift amount changing device (VT) which is associated with the internal combustion engine (E), and which enables switching between the all-cylinder activation mode and the cylinder deactivation mode by changing the amount of lifts of intake and exhaust valves (IV, EV) associated with the cylinders; a lift operating device (33) which is associated with the lift amount changing device (VT) to operate the same; a cylinder activation enforcing device (33?) which is operatively disposed between the lift amount changing device (VT) and the lift operating device (33) so as to enforce the all-cylinder activation mode as necessary.

Abstract: An air conditioning device for a vehicle having a regenerative section improves efficiency of regeneration. The air conditioning device comprises a compressor (6) connected to an output shaft (1a) of an engine (1) via an electromagnetic clutch (5), a motor-generator (2) for electrically recovering kinetic energy of the vehicle (100) during deceleration, a battery (9) for storing energy regenerated by the motor-generator (2), and a motor-driven compressor (13). When the vehicle (100) is in a deceleration state, the compressor (6) is disconnected from the engine (1) by disengaging the electromagnetic clutch (5), and air conditioning is performed by the motor-driven compressor (13).

Abstract: A control apparatus for an on-vehicle electricity storage device, which enables an appropriate charging of the on-vehicle electricity storage device while preventing degradation of the on-vehicle electricity storage device. The counter value of a high voltage maintaining counter CVB14V and the timer value of a sustain time subtraction timer TACG2 are increased over the period after time t1 in which the inter-terminal voltage VB of the battery is maintained to be greater than the predetermined mode switching threshold voltage #VB14V. The counter value and the timer value decrease over the period from time t2 to time t3. At time t3, the operation mode is switched from a non-charging mode to a charging mode.

Abstract: A control apparatus of a hybrid vehicle is provided, capable of charging the battery device when the state of charge of the battery device tends to decrease and the initial state of charge of the battery device is reduced by a predetermined amount. The present device comprises a lower limit threshold value setting device S060, an upper limit threshold value setting device for setting the lower limit and upper limit threshold values of the discharge amount of the battery device, a mode setting device S054 for increasing the state of charge when the state of charge is reduced to the lower limit threshold value, a mode setting release device S062 for releasing the mode setting changed by the mode setting device, and a discharge depth detecting device S063 for detecting the discharge amount of the present state of charge by comparison with the initial state of charge. The threshold value for determining whether it is necessary for the motor to assist the engine is modified depending upon the discharge depth.

Abstract: In order to improve the fuel consumption efficiency of a hybrid vehicle, a control apparatus 1 for a hybrid vehicle is provided, which comprises as a power source a motor M and an engine E capable of executing partial cylinder deactivation operation and the driving force of at least one of these is transmitted to wheels for running the vehicle. When the required output is larger than the output of the engine under partial cylinder deactivation operation, and is smaller than the total output of the engine and the motor, which is adjustable for assisting the engine, the control apparatus operates the engine under partial deactivation and adjusts the motor output so as to compensate the difference between the total output of the power source and the output of the partial cylinder deactivated engine.

Abstract: A valve control system for an internal combustion engine, which enables the operating mode of a valve system to be switched in optimal timing while preventing the driver from feeling the switching operation so busy and at the same time securing feeling of acceleration, thereby improving drivability. A variable valve-actuating mechanism is capable of selectively switching the operating mode of a valve system including intake valves and an exhaust valve between a plurality of operating modes different in output characteristics. Whether or not the operating mode of the valve system should be switched is determined. The execution of the switching of the operating mode of the valve system based on the determination is suppressed according to a degree of suppression set depending on detected load on the engine.

Abstract: A control system for a hybrid vehicle, which enables the hybrid vehicle to optimally selectively use driven modes to attain excellent fuel economy and thereby make it possible to improve fuel economy. The hybrid vehicle is operated in an engine-driven mode or a motor-driven mode, and recovers electric energy for driving an electric motor, using the output from the engine. The control system calculates a driving fuel consumption amount of the engine required for driving the hybrid vehicle in the engine-driven mode and a recovering fuel consumption amount of the engine required for recovering electric energy to be consumed when the hybrid vehicle is driven in the motor-driven mode, and sets the driven mode to the motor-driven mode when the recovering fuel consumption amount is smaller than the driving fuel consumption amount, and to the engine-driven mode when the former is larger than the latter.

Abstract: A hybrid vehicle comprises an engine and a motor as its drive sources. The hybrid vehicle also comprises a control device which stops the fuel supply to the engine at the time of vehicle deceleration, and performs regenerative braking by the motor depending on the deceleration state, in which the engine is a cylinder deactivation engine capable of switching between all cylinder operation for operating all cylinders and cylinder deactivation operation for deactivating at least one or more cylinders. The cylinder deactivation operation is conducted during deceleration state of the vehicle to reduce pumping losses of the engine so that the regeneration efficiency of the motor is improved. The control device comprises an abnormality detection device which detects abnormality in the cylinder deactivation engine, and a motor output limiting device which limits the output of the motor in response to the detection of the abnormality.

Abstract: 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.

Abstract: A control apparatus for automatically stopping and restarting an engine of a vehicle is provided, which is equipped with an engine, a motor, a compressor and an air conditioner. The apparatus has a first section for making a judgment on stopping the engine and a second section for making a judgment on restarting the engine. The apparatus has features that the apparatus provides the air conditioner with a plurality of operational modes selected by a user, and when the vehicle is not in motion with selection of a first mode, the first section permits the engine to stop if a first power that the motor can supply is greater than a second power of the compressor required by the air conditioner, and the second section permits the engine to restart if the second power exceeds the first power.

Abstract: An automatic stop and start control system for a multiple-cylinder internal combustion engine mounted on a vehicle is disclosed. The automatic stop and start control system performs a control for automatically stopping and restarting the engine according to operating conditions of the vehicle and the engine. Fuel is provided to at least one of the cylinders of the engine when an engine stop condition for stopping the engine is satisfied. Subsequently, the fuel supply to all of the cylinders of the engine is stopped. The fuel supply to at least one of the cylinders is immediately carried out at the time an engine restart condition for restarting the engine is satisfied.

Abstract: 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.

Abstract: The present invention provides an air-fuel ratio feedback control apparatus for an internal-combustion engine. The apparatus includes an air-fuel ratio detector that is disposed in an exhaust system of the engine so as to detect an air-fuel ratio of exhaust gas, NOx purifier for purifying NOx contained in the exhaust gas during a lean operation and feedback controller for making a feedback control upon an air-fuel ratio of air-fuel mixture to be supplied to the engine based on an output of the air-fuel ratio detector. A diagnostic system diagnoses the NOx purifier based on an output of an O2 sensor disposed downstream of the NOx purifier when the air-fuel ratio of the air-fuel mixture to be supplied to the engine has been changed from lean to rich and gain changer for making a feedback control gain of the feedback controller smaller when the air-fuel ratio is changed from lean to rich.

Abstract: A control apparatus for automatically stopping and restarting an engine of a vehicle is provided, which is equipped with an engine, a motor, a compressor and an air conditioner. The apparatus has a first section for making a judgment on stopping the engine and a second section for making a judgment on restarting the engine. The apparatus has features that the apparatus provides the air conditioner with a plurality of operational modes selected by a user, and when the vehicle is not in motion with selection of a first mode, the first section permits the engine to stop if a first power that the motor can supply is greater than a second power of the compressor required by the air conditioner, and the second section permits the engine to restart if the second power exceeds the first power.

Abstract: A control apparatus for an on-vehicle electricity storage device, which enables an appropriate charging of the on-vehicle electricity storage device while preventing degradation of the on-vehicle electricity storage device. The counter value of a high voltage maintaining counter CVB14V and the timer value of a sustain time subtraction timer TACG2 are increased over the period after time t1 in which the inter-terminal voltage VB of the battery is maintained to be greater than the predetermined mode switching threshold voltage #VB14V. The counter value and the timer value decrease over the period from time t2 to time t3. At time t3, the operation mode is switched from a non-charging mode to a charging mode.

Abstract: A control apparatus of a hybrid vehicle is provided, capable of charging the battery device when the state of charge of the battery device tends to decrease and the initial state of charge of the battery device is reduced by a predetermined amount. The present device comprises a lower limit threshold value setting device S060, an upper limit threshold value setting device for setting the lower limit and upper limit threshold values, respectively, of the discharge amount of the battery device, a mode setting device S054 for increasing the state of charge when the state of charge is reduced to the lower limit threshold value, a mode setting release device S062 for releasing the mode setting changed by the mode setting device, and a discharge depth detecting device S063 for detecting the discharge amount of the present state of charge by comparison with the initial state of charge.

Abstract: 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.

Abstract: A hydraulic control apparatus for a hybrid vehicle, which enables a smooth torque transmission when an engine of the vehicle is started from an idling stop state. The hydraulic control apparatus includes an engine and a motor as power sources, a transmission having a torque converter a clutch for a starting gear, an engine automatic stop and start device which is associated with the engine, a motor-driven oil pump for supplying oil pressure to the transmission, a brake pedal sensor, an accelerator pedal sensor, an engine revolution rate sensor. The oil pressure applied to the clutch is controlled to a level corresponding to a creeping torque when the engine is automatically stopped. When the brake pedal is released, the engine is automatically started, the accelerator pedal is not depressed, and the engine revolution rate is less than an idling revolution rate, the oil pressure applied to the clutch is maintained to the level corresponding to the creeping torque.

Abstract: In order to improve the fuel consumption efficiency of a hybrid vehicle, a control apparatus 1 for a hybrid vehicle is provided, which comprises as a power source a motor M and an engine E capable of executing partial cylinder deactivation operation and the driving force of at least one of these is transmitted to wheels for running the vehicle. When the required output is larger than the output of the engine under partial cylinder deactivation operation, and is smaller than the total output of the engine and the motor, which is adjustable for assisting the engine, the control apparatus operates the engine under partial deactivation and adjusts the motor output so as to compensate the difference between the total output of the power source and the output of the partial cylinder deactivated engine.