Abstract: A control device for a hybrid vehicle including an engine for outputting a propulsion force for the vehicle, a motor for assisting the output from the engine, and a storage unit for storing generated energy when the motor is used as a generator under the output from the engine and regenerated engine obtained from regenerative braking of the motor at the time of vehicle deceleration. Moreover, the control device includes an engine output detection device for detecting a change in output from the engine, and a motor control device for, in the case where an increase in output from the engine is detected at the time of vehicle traveling when the motor is not assisting the output from the engine, simultaneous with the increase in output, converting the increase amount in output into the generated energy using the motor.

Abstract: 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.

Abstract: There is provided a control device for an engine including an automatic stop and start function, wherein detected data taken prior to an engine stop or results of an operation carried out based on the detected data are retained in executing an engine automatic stop control. In particular, in a case where the technology is applied to an engine including a thermostat proper operation determination function, a thermostat proper operation determination process is constructed so as to continue to be executed in executing an engine automatic stop control.

Abstract: An engine idling control device includes a secondary air supply device, an intake gauge pressure detecting unit and a secondary air supply control unit. The secondary air supply device is disposed on a bypass intake passage communicating with an intake pipe and bypassing a throttle valve. The intake gauge pressure detecting unit detects an intake gauge pressure on the intake pipe side. The secondary air supply control unit controls the secondary air supply device so as to open and close the bypass intake passage when an engine is in an idling state. The secondary air supply device is controlled to obtain the optional opening value. The secondary air supply control unit controls such that the secondary air supply device increases the opening value when the intake gauge pressure becomes higher than a predetermined low load condition in an idling state.

Abstract: The control apparatus for an internal combustion engine of the present invention comprises: a fuel supply device for supplying fuel to the internal combustion engine; a fuel tank for retaining fuel; a purge device for purging fuel vapor, produced in the fuel tank, into an intake system of the internal combustion engine; a purge correction amount updating device for calculating a purge correction amount for correcting an amount of fuel to be supplied by the fuel supply device, depending on the amount of fuel vapor purged by the purge device; a target air-fuel ratio setting device for setting a target air-fuel ratio depending on a running state of the internal combustion engine; and an update amount setting device for updating the purge correction amount depending on the target air-fuel ratio set by the target air-fuel ratio setting device.

Abstract: The present invention increases the frequency of the LAF sensor deterioration determination in the case that air-fuel ratio control is being carried out while the deterioration of the LAF sensor is being monitored. When the monitor conditions are no longer satisfied during the deterioration determination of the LAF sensor (as shown in (a) and (b) of FIG. 6), the LAF prohibition timer is operated (as shown in (c) of FIG. 6), and switching to a lean burn is prohibited for a predetermined time interval (for example, 7 seconds), and in addition, after the LAF sensor deterioration determination has completed, after passage of a time interval shorter than this predetermined time interval (for example, 2 seconds) (as shown in figures (c) and (d) of FIG. 6), a lean burn is permitted.

Abstract: An evaporating fuel processing apparatus of an internal combustion engine is disclosed, which can reliably determine the presence or absence of leakage even if stopping and restarting operations of the internal combustion engine are alternately repeated.

Abstract: The control apparatus of the present invention is provided in a hybrid vehicle with a combustion engine for outputting a driving force, an electric motor for generating a force for assisting the output from the engine, depending on the driving conditions, a power storage unit for storing electric energy generated by the motor acting as a generator using the output from the engine and electric energy regenerated by the motor when the vehicle decelerates. The control apparatus includes: a speed limiter for decreasing the driving force produced by the motor when the vehicle speed exceeds a first threshold value while the engine and the motor produce the driving force; a generation starter for starting generation by the motor when the vehicle speed exceeds a second threshold value which is higher than the first threshold value; and a generation amount setting device for setting the amount of generation, depending on the driving conditions of the vehicle, when the generation starter starts the generation.

Abstract: This invention relates to an engine stall prevention apparatus for a hybrid vehicle. This engine stall prevention apparatus comprises a clutch operation detection device which detects an operation of a clutch; a clutch state determination device which determines the state of the clutch based on the relationship between the vehicle speed and the engine speed; a throttle opening degree determination device which determines the degree of throttle opening of the engine; a first engine speed modification device (S010) which modifies a charging/regeneration allowing lower limit engine speed value above which deceleration regeneration by the electric motor is allowed; and a half-engaged clutch determination maintaining device (S008) which outputs a determination signal indicating that the clutch is half-engaged for a predetermined period of time when the throttle is completely closed and the clutch is determined to be half-engaged.

Abstract: In order to prevent an occurrence of dieseling phenomenon, and to prevent engine rotation speed from decreasing during idle operation or the idle operation from being stopped, in step S111, it is determined whether the flag value of an idle stop flag F_IDLSTP is “1” or not. If it is determined that the determination result is “YES”, that is, if it is determined that the internal combustion engine body is stopped, 0% is set to a target purge control valve drive duty value PGCMD (step S105), and 0 is set to the target purge flow rate QPGC (step S106). If it is determined that the determination result is “NO”, that is, when the internal combustion engine body is in operation, PGCMD calculation processing is executed (step S112).

Abstract: A control system is provided for a hybrid vehicle with an engine, a motor, and a power storage unit. The control system comprises: an assist trigger threshold value setting device for setting a throttle opening state when the motor starts assist for the output from the engine; a throttle opening state lower limit setting device for setting a lower limit by subtracting a predetermined value from the threshold value obtained by the assist trigger threshold value setting device; a generation reduction device for gradually reducing the generation by the motor between the lower limit and the threshold value so that the generation finally becomes zero when the present throttle opening state reaches the threshold value, when the vehicle shifts from a generation state, in which the motor acts as a generator and the output is supplied only from the engine, to an output assist state in which the motor assists the output.

Abstract: The control system of the present invention is provided for a hybrid vehicle with an engine and a motor, which are power sources, and a power storage unit for storing energy generated by the output from the engine and regenerative energy produced by regeneration of the motor when the vehicle decelerates. Based on monitoring the state of charge of the power storage unit, when the stored energy is discharged so that the remaining charge is decreased from an initial state of charge, which was detected when the vehicle started running, by a predetermined amount, the function of the motor is switched from the discharging of the power storage unit to the charging of the power storage unit.

Abstract: A fuel injection apparatus for internal combustion engine of this invention applies detection output of a wide-range air/fuel ratio sensor to an observer so as to estimate an air/fuel ratio of individual cylinder and, based on thus estimated air/fuel ratio, obtains an air/fuel ratio correction coefficient for individual cylinder and correctively controls the fuel injection amount for individual cylinder with the air/fuel ratio correction coefficient for individual cylinder. While the estimation processing of the observer is always continued, the air/fuel ratio correction coefficient for individual cylinder is automatically adjusted, for example, when the estimated air/fuel ratio becomes an abnormal value, according to operational condition of the internal combustion engine, and the like, thereby securing the stability in the corrective control and preventing the emission from deteriorating.

Abstract: An intake air amount-estimating apparatus for an internal combustion engine estimates an amount Gc of intake air actually drawn into a combustion chamber, based on a model formulated on an intake passage in which a portion of the intake passage extending from a throttle valve to each of the combustion chamber is regarded as a chamber. A value Gc' of the intake air amount in a steady operating condition is determined at least based on engine rotational speed and pressure within the chamber. An effective opening area A of the throttle valve is determined at least based on throttle valve opening and the pressure within the chamber. A first-order delay value ADELAY of the effective opening area of the throttle valve is determined. The intake air amount value Gc' is corrected to calculate the amount Gc by an equation of Gc=Gc'.times.(A/ADELAY).

Abstract: In an evaporative fuel control system in an internal combustion engine, a purge gas concentration is estimated by a purge gas concentration estimating device based on an air-fuel ratio correcting factor provided when a purge control valve is in its opened state and an air-fuel ratio correcting factor provided when the purge control valve is in its closed state. A lower limit value of an air-fuel ratio correcting factor, set by an air-fuel ratio correcting factor setting device, is determined by an air-fuel ratio correcting factor limit value setting device in accordance with the purge gas concentration estimated by the purge gas concentration estimating device. Thus, the lower limit value of the air-fuel ratio correcting factor can be varied depending upon the concentration of the purge gas, thereby setting an air-fuel ratio control range corresponding to the concentration of the purge gas.

Abstract: A system for controlling an electric fuel pump housing a DC motor therein for an internal combustion engine using a gasoline-alcohol blend fuel. A switchover line is preestablished with respect to alcohol concentration in the fuel and operating condition of the engine such as an engine load, an engine speed or both the engine load and engine speed. If the detected condition exceeds the switchover line in a high engine load, a relay is energized so that battery voltage is supplied to the motor through a line bypassing a resistor provided at an initial power supply line. Voltage and hence current applied to the motor is thus increased to raise pump speed higher. Although the system construction is simple and low-cost, sufficient fuel can be supplied at the high engine load.

Abstract: An evaporated fuel control system in internal combustion engines includes a canister filled with an adsorbent for adsorbing an evaporated fuel in a fuel tank, a purge amount control device provided in the middle of a purge passage connecting an intake passage and the canister, and a fuel supply device. The purge flow rate from the start of purging is integrated, and the purge amount is reduced to a larger extent in response to a purge amount integration value becoming smaller. This improves the nature of an exhaust gas immediately after the start of purging and the like.

Abstract: An evaporative emission control system for an internal combustion engine controls purging of evaporative fuel into the intake pipe of the engine. A first control valve is arranged in a communication passage communicating between a charcoal canister and the intake pipe, for supplying the evaporative fuel to the engine at a flow rate dependent on load on the engine. A second control valve is arranged in a bypass passage bypassing the first control valve for supplying the evaporative fuel to the engine at a predetermined flow rate. When a temperature of the engine is below a predetermined value, the first control valve is closed and at the same time the second control valve is made open, to thereby supply the evaporative fuel to the engine at the predetermined i.e. small flow rate. For a predetermined time period after the engine has been warmed up, the first and second control valves are controlled in the same manner. When the engine is idling as well, the same control of the two valves is carried out.

Abstract: A system for controlling heater mounted on a spark plug which ignites the air-fuel mixture in the combustion chamber of an internal combustion chamber. The heater-on time is determined such that it decreases with increasing engine temperature and increasing alcohol concentration. Current supplied to the heater is also determined such that it increases with increasing alcohol concentration and decreases with increasing engine temperature. Therefore, droplets at the spark plug caused by high alcohol concentration fuel can be removed while eliminating carbon fouling. The engine startablity can thus been improved without shorting the service life of the spark plug. Moreover, fuel injection amount is reduced so as not another fuel be deposited on a droplet fuel which is still being present. The heater is furthermore kept off when a starter motor is turning to supply sufficient power to the motor.

Abstract: 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.