Honda Giken Kogyo Kabushiki Kaisha

Keisuke Uchida

Atsushi Izumiura

Asao Ukai

Shigetaka Kuroda

Shinichi Kitajima

Kazutomo Sawamura

Hironao Fukuchi

Yasuo Nakamoto

Takashi Kiyomiya

Katsuhiro Kumagai

Kenji Nakano

Fumihiko Konno

Teruo Wakashiro

Atsushi Matsubara

Hideyuki Oki

Hideyuki Takahashi

Yoichi Iwata

Youichi Iwata

Nobuyuki Irie

The engine control system for a hybrid vehicle, according to the present invention, having an internal combustion engine and an electric motor as driving force sources, comprises: a clutch, provided between the engine and a transmission system, for disabling and enabling driving force transmission between the engine and the transmission system; clutch disengagement detector for detecting engagement/disengagement of the clutch; engine speed detector for detecting an engine speed; and fuel cutter for permitting stopping and restarting of the engine in accordance with at least a result of detection by the clutch disengagement detector among predetermined drive conditions, and cutting fuel supply to the engine when the vehicle decelerates, a fuel-supply restart engine speed at which fuel supply is resumed being set in the fuel cutter. Stopping the engine is accomplished by cutting fuel supply by the fuel cutter, and once the engine stop is initiated, even when the engine speed reaches the fuel-supply restart engine speed, fuel supply cut by the fuel cutter is maintained, and when the engine speed detected by the engine speed detector at a time of disengagement of the clutch is detected by the clutch disengagement detector is equal to or lower than a predetermined engine speed, fuel supply cut by the fuel cutter is maintained whereas when the detected engine speed is higher than the predetermined engine speed, fuel supply is restarted.

Engine control system for hybrid vehicle

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.

Control system for hybrid 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.

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

Growing community of inventors

Wako, Japan

Keisuke Uchida