Abstract: A hybrid vehicle control apparatus for improving fuel consumption ratio by making appropriate the deceleration perception of the hybrid vehicle is provided. It is determined whether the flag setting of a brake ON determination flag is “1”. If the brake is OFF, a brake OFF regeneration amount is obtained, and is assigned to the deceleration regeneration computed value. It is determined whether a remaining batter charge is greater than or equal to a predetermined normal power generation mode execution upper limit remaining charge. In the case where the determination result is yes, it is determined whether a control vehicle speed is greater than or equal to a predetermined high speed deceleration regeneration reduction lower limit vehicle speed. In the case where the determination result is yes, the value obtained by multiplying the deceleration regeneration computed value by a predetermined high speed deceleration regeneration reduction coefficient, for example 0.

Abstract: An engine control apparatus is provided for a hybrid vehicle that installs an engine and a motor as driving power sources for driving wheels as well as an automatic transmission such as CVT. The engine control apparatus basically operates to enable automatic stop and restart of the engine in response to drive conditions of the vehicle. In addition, the engine control apparatus cuts off fuel supply to the engine at a deceleration mode of the vehicle. At a deceleration mode of the vehicle under execution of fuel cut, the engine control apparatus maintains idle rotation of the engine by operating the motor to rotate in response to engine speed until the automatic transmission is returned to a restart-enable reduction ratio (e.g., 2.2 to 2.45). That is, the engine control apparatus allows execution of an engine stop after securing a restart-enable state of the automatic transmission.

Abstract: A control apparatus applied to a hybrid vehicle is disclosed, by which the output assist by the motor with respect to the engine output can be limited or stopped in the high speed driving mode. The control apparatus comprises a section for stopping the operation of the motor from assisting the engine output when the engine output is assisted by the motor and the speed of the vehicle exceeds a predetermined first threshold value; and a section for starting the regenerating operation of the motor when the speed of the vehicle exceeds a predetermined second threshold value which is larger than the first threshold value.

Abstract: A control device for a hybrid vehicle is provided, which executes charging of a capacitor when a depth-of-discharge of a capacitor exceeds a predetermined depth-of-discharge which is set based on a vehicle speed. The control device of the hybrid vehicle, provided with an engine, a motor for assisting the output of the engine, and a capacitor for supplying electric power to the motor and for storing regenerative energy, comprises a depth-of-discharge detecting device (S063) for detecting a depth-of-discharge DOD of the capacitor, wherein when the depth-of-discharge DOD of the capacitor falls below the depth-of-discharge limit value DODLMT (053), the capacitor is charged so as to recover the depth-of-discharge of the capacitor.

Abstract: In order to effectively prevent generation of a counter electromotive voltage during cruising, the present invention provides a control system of a hybrid vehicle comprising an engine, motor, and a capacitor, including an engine rotational speed sensor for detecting the engine rotational speed NE, a target voltage setting device for setting a charge target voltage (target capacitor voltage), and a motor ECU for controlling the charge of said power storage unit. A target capacitor voltage VCAPCMD is set based on the detected engine rotational speed NE (step S300), and when the capacitor voltage VCAP<the target capacitor voltage VCAPCMD (step S311 is “YES”), a charging operation is executed until the target capacitor voltage VCAPCMD≦the capacitor voltage VCAP. Thereby, it is possible to maintain the counter electromotive voltage<the capacitor voltage.

Abstract: A control system for a hybrid vehicle with an engine for producing a driving force for the vehicle, a motor for producing an assist driving force to assist the output from the engine, and a power storage unit for supplying electric energy to the motor and storing regenerated energy produced by regeneration of the motor when the vehicle decelerates. The control system includes a charge zone determining device for determining whether a state of charge (SOC) is within the normal use range, temporary use range, over-discharge range, or over-charge range; a generation mode selector for selecting one of a normal generation mode corresponding to normal use zone, a low generation mode corresponding to temporary use zone, a high generation mode corresponding to over-discharge zone, and a generation stop mode corresponding to over-charge zone, based on the determination by the charge zone determining device; and a generation amount setter for setting the amount of electric power generation corresponding to each mode.

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: 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: 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: 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 apparatus for a hybrid vehicle having a dynamotor which operates as a motor for assisting the output of an internal combustion engine and which operates as a generator for regenerating the running energy of the vehicle. The control apparatus, in accordance with operating conditions of the vehicle, controls an assist operation for supplying electric power from a storage device to the dynamotor and a regenerative operation for charging the storage device by the generated power of the dynamotor, and determines an acceleration mode for performing an assist operation or a cruising mode for selectively performing the assist operation and a regenerative operation, in accordance with an engine rotational speed and a throttle valve opening degree, or a vehicle speed of the vehicle and the throttle valve opening degree.

Abstract: An oxygen concentration sensor abnormality-detecting system is provided for an internal combustion engine having first and second oxygen concentration sensors arranged in the exhaust system upstream and downstream of a catalytic converter therein. An ECU determines that the first oxygen concentration sensor is functioning abnormally if an output from the first oxygen concentration sensor does not change when an output from the second oxygen concentration sensor changes.

Abstract: A system for detecting failure of a fuel pressure sensor in an internal combustion engine, including an injector (32) provided at an intake system of the engine downstream of a throttle valve (38), a fuel supply passage (16) connected to a fuel supply source (fuel tank 12) for supplying fuel to the injector (32), pressure regulator (28) provided in the fuel supply passage (16) and operating to maintain a difference between the fuel pressure (PF2A) and the manifold absolute pressure at a constant value, a fuel pressure sensor (PF2 sensor 54) for detecting the fuel pressure (PF2A) in the fuel supply passage (16) downstream of the pressure regulator, and a manifold absolute pressure sensor (62) for detecting the manifold absolute pressure (PBA) downstream of the throttle valve (38). In the system, an index indicative of a ratio (.DELTA.PF2A) of the fuel pressure (PF2A) fluctuation relative to the manifold absolute pressure (PBA) fluctuation is compared to reference values (#PF2L, #PF2H) which define a range.

Abstract: An evaporative emission control system for an internal combustion engine has a purge control valve arranged in a purging passage connecting between a canister and an intake passage of the engine. The evaporative emission control system has a self-diagnosis function of determining whether the evaporative fuel emission control system is normal or abnormal from a change in a value of a parameter measured based on an output from an exhaust gas component concentration sensor arranged in an exhaust passage of the engine, which change is detected when the opening of the purge control value is changed, and a variation in pressure within the intake passage at a location downstream of a throttle valve arranged therein when the opening of the purge control valve is changed.