Honda Giken Kogyo Kabushiki Kaisha

Honda Giken Kogyo K.k.

Kenji Nakano

Shigetaka Kuroda

Teruo Wakashiro

Hideyuki Takahashi

Hironao Fukuchi

Youichi Iwata

Kazutomo Sawamura

Yuichi Shimasaki

Asao Ukai

Takashi Kiyomiya

Fumihiko Konno

Atsushi Matsubara

Atsushi Izumiura

Yasuo Nakamoto

Katsuhiro Kumagai

Daisuke Shimizu

Keisuke Uchida

Shinichi Kitajima

Hideyuki Oki

Yoshihisa Hara

Takanori Shiina

Hiroshi Yatani

Hiroshi Mifune

Yuichiro Tanabe

Nobuyuki Irie

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 CVBV and the timer value of a sustain time subtraction timer TACGare increased over the period after time tin which the inter-terminal voltage VB of the battery is maintained to be greater than the predetermined mode switching threshold voltage #VBV. The counter value and the timer value decrease over the period from time tto time tAt time tthe operation mode is switched from a non-charging mode to a charging mode.

Control apparatus for on-vehicle electricity storage device

A control device for a hybrid vehicle powered from an engine and an assist motor for supplying electric power in an amount predetermined according to running conditions of the vehicle further includes means for detecting a catalyzer temperature and correcting the predetermined assist power value according to the detected catalyzer temperature when accelerating and means for preventing the idling engine from being cut off when detected catalyzer temperature is lower than a preset temperature. This control device thus realizes rapid heating of the catalyzer device to a temperature necessary for activating the catalyzer therein by adequately correcting the assist power value of the motor according to the current catalyzer temperature when accelerating and by preventing the idling engine from being cut off while the catalyzer device has a low temperature.

Control device for a hybrid vehicle

An apparatus for controlling a hybrid vehicle having an internal combustion engine and an electric motor as driving sources for the vehicle, in which when it is detected that an air-fuel ratio of a supply air-fuel mixture to the engine changed to the lean side value (S S ), the electric motor ( ) is made operative as a motor in order to assist an output of the engine just after the detection (S S ). When it is detected that the air-fuel ratio of the supply air-fuel mixture changed to the rich side value (S S S ), the electric motor ( ) is made operative as a generator for the purpose of the regeneration braking just after the detection (S S ). An output torque difference of the engine, therefore, when the air-fuel ratio of the supply air-fuel mixture changes can be sufficiently compensated without a time delay.

Control device of hybrid drive vehicle

When the shift position is an N position or a P position during deceleration of a vehicle, or when a brake pedal is depressed even if the shift position is a D position or an R position, an engine E is stopped to prohibit an unnecessary idling operation by prohibiting the restarting of the supplying of fuel subsequent to the fuel cut by a command from an electronic control unit. If the supplying of fuel is restarted when the engine is in stoppage, a starter motor is driven automatically to start the engine. Thus, in a vehicle including an automatic transmission, the time of stoppage of the engine can be prolonged as much as possible in a range in which the operability of the vehicle is injured, thereby providing a reduction in amount of fuel consumed.

Engine stop control system for vehicle

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.

Control system for hybrid vehicle

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.

Control apparatus for a hybrid vehicle

A hybrid vehicle has a transmission coupled to the output shaft of an engine for transmitting an output power of the engine to drive wheels of the hybrid vehicle. A generator motor is coupled to the transmission for transmitting an assistive output power for assisting the output power of the engine through the transmission to the drive wheels. A battery stores electric energy regenerated by the generator motor, operating as an electric motor, from kinetic energy of the hybrid vehicle transmitted from the drive wheels through the transmission when the hybrid vehicle is decelerated. A transmission control unit establishes a speed reduction ratio for the transmission to achieve a predetermined regeneration efficiency for the generator motor when the hybrid vehicle is decelerated, and controls the transmission at the established speed reduction ratio.

Hybrid vehicle

A regeneration control device for a hybrid vehicle includes an internal combustion engine, driving wheels drivable by the internal combustion engine, a motor for additionally supplying electric power for driving the driving wheels, a transmission between the engine, motor and driving wheels and an accumulator for supplying electric power to the motor, which causes the motor to work, while braking the vehicle, as a generator whose output is returned to the accumulator which in turn stores electric energy regenerated depending upon the deceleration degree. The control device also has calculating means for determining the degree of downward slope of a road whereon the vehicle is running and correcting means for correcting a regenerable energy amount according to the downward slope determined by the calculating means when using the motor as the generator, the output of which is thus corrected and returned to charge the accumulator in such a way that the accumulator may not rapidly be charged to its full capacity, thus preventing regeneration from being ineffective due to the full charge of the accumulator.

Regeneration control device for a hybrid vehicle

A hybrid vehicle has an engine for propelling the hybrid vehicle, a power transfer mechanism for transferring an output power of the engine from an output shaft thereof to drive wheels of the hybrid vehicle, an electric motor for supplying an assistive output power to assist the output power of the engine through the power transfer mechanism to the drive wheels, and an electric energy storage unit for storing electric energy for energizing the electric motor. The hybrid vehicle also has a controller for controlling operation of the hybrid vehicle with the engine and the electric motor. If the amount of electric energy stored in the electric energy storage unit is greater than a predetermined quantity, the controller controls the electric motor to generate the assistive output power to start the hybrid vehicle with the electric energy supplied from the electric energy storage unit to the electric motor while the engine is idling or stopped. If the amount of electric energy stored in the electric energy storage unit is smaller than the predetermined quantity, the controller controls the engine to generate an output power to start the hybrid vehicle while the electric motor is being de-energized.

A hybrid vehicle has a generator motor coupled to the output shaft of an engine through a transfer shaft, for transmitting an assistive output power for assisting an output power of the engine through the transfer shaft to the output shaft of the engine. A battery stores electric energy regenerated by the generator motor from kinetic energy of the hybrid vehicle transmitted from the output shaft of the engine through the transfer shaft. A generator is mounted on the transfer shaft and has an electric energy generating ability smaller than the generator motor. The generator generates electric energy to energize another device than the battery.

A control system for an internal combustion engine has a canister for adsorbing evaporative fuel generated in the fuel tank, a purging passage extending between the canister and the intake system of the engine, for purging evaporative fuel into the intake system, and a purge control valve arranged across the purging passage, for controlling the flow rate of evaporative fuel supplied to the intake system through the purging passage. An ECU controls the engine, based on at least one predetermined engine control parameter, and a canister temperature sensor detects the temperature of the canister. The at least one predetermined engine control parameter is changed according to the detected temperature of the canister.

Control system for internal combustion engines

An air-fuel ratio control system for an internal combustion engine has an air-fuel ratio sensor arranged in the exhaust system of the engine, for detecting the air-fuel ratio of exhaust gases emitted from the engine, and various engine operating parameter sensors for detecting operating conditions of the engine. An ECU controls the air-fuel ratio of an air-fuel mixture to be supplied to the engine to a desired air-fuel ratio in a feedback manner responsive to an output from the air-fuel ratio sensor. A first learned value for correcting the desired air-fuel ratio is calculated based on the feedback control when the engine is detected to be in a first predetermined operating condition, and a second learned value for correcting the desired air-fuel ratio when the engine is detected to be in a second predetermined engine operating condition. The air-fuel ratio of the air-fuel mixture is controlled to a value leaner than a stoichiometric value, by using the first learned value. The first learned value is learned again when the difference between the first and the second learned values is larger than a predetermined re-learning-determining threshold value.

Air-fuel ratio control system for internal combustion engines

There is provided a control system for an internal combustion engine. An amount of variation in the rotational speed of the engine is detected. A rotational speed variation reference value is calculated based on an averaged value of the detected amount of variation in the rotational speed of the engine. The detected amount of variation in the rotational speed of the engine is compared with the rotational speed variation reference value. The amount of fuel to be supplied to the engine is corrected based on results of the comparison.

A fuel supply control system for an internal combustion engine in which an accelerating fuel increment of fuel supplied to the engine is set in response to the detected change rate in the opening degree of the throttle valve. Further, the accelerating fuel increment is set in such a manner that it is smaller as the detected reduction gear ratio of the transmission is larger. Advantageously, the accelerating fuel increment is set to increase at a smaller rate as the above detected change increases within a region within which the change rate is smaller than a region in which the change rate is larger.

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Wako, Japan

Kenji Nakano