Honda Motor Co., Ltd.

Noritaka Kimura

Hajime Uto

Kosuke Ihara

Yosuke Yamada

Yuto Katori

Masaki Ueno

Ken Ogawa

Naoaki Takeda

Atsushi Umemoto

Takeo Kobayashi

Makoto Kurahashi

Yoshikazu Tanaka

Takuya Yamada

Yoshinori Matsuo

Takayoshi Nakamura

Yoshikazu Ishitsuka

Masashi Hidaka

Teruyoshi Morita

A control device of an internal-combustion engine capable of improving merchantability by promptly and appropriately securing an in-cylinder fresh air amount even when an internal-combustion engine including a boost device and an EGR device is in a transient operation state is provided. A control deviceincludes an ECU. The ECUcalculates an intake air amount GGAScyl, sets an upper-limit target fresh air amount GAIR_hisH, controls a boost operation of a boost devicewhen an operating range of an internal-combustion engineis in a predetermined boost range, and controls an EGR deviceso that exhaust gas recirculation is stopped when the intake air amount GGAScyl does not reach an upper-limit target fresh air amount GAIR_hisH and the exhaust gas recirculation is executed when the intake air amount GGAScyl reaches the upper-limit target fresh air amount GAIR_hisH in the predetermined boost range.

Control device of internal-combustion engine

A cooling system for a vehicle, includes a first cooling circuit including a first coolant passage and a first pump. The first pump is provided in the first coolant passage to circulate coolant in the first cooling circuit so as to cool a first device to a first temperature. A second cooling circuit includes a second coolant passage and a second pump. The second pump is provided in the second coolant passage to circulate coolant in the second cooling circuit so as to cool a second device to a second temperature. The second temperature is lower than the first temperature. The coolant introduction passage connects the first cooling circuit and a connected portion of the second cooling circuit between the second device and a second radiator and upstream of the second device to supply the coolant in the first cooling circuit to the second cooling circuit.

Cooling system for vehicle

Provided is a control device for an internal combustion engine, which can ensure a stable combustion state of the internal combustion engine even under a high-humidity environment condition, thereby improving the merchantability. The control device for the internal combustion engine includes an ECU (electronic control unit). The ECU calculates a basic target EGR amount according to an operating state of the internal combustion engine, calculates a water vapor amount in air drawn into an intake passage of the internal combustion engine, calculates an EGR conversion amount by using the water vapor amount, calculates a target EGR amount by subtracting the EGR conversion amount from the basic target EGR amount, and controls internal EGR and external EGR of the internal combustion engine by using the target EGR amount.

Control device for internal combustion engine

In a control device of an internal-combustion engine according to the disclosure, an intake throttle valve () for adjusting an EGR valve differential pressure (&#x394;PEGR) is provided, an EGR valve upstream pressure (PEGR) is estimated by using a target fresh air amount (GAIRCMD) (step), a target differential pressure (&#x394;PEGRCMD) is set to a smaller value as the target fresh air amount (GAIRCMD) becomes smaller (FIG.), and a difference between the EGR valve upstream pressure (PEGR) and the target differential pressure (&#x394;PEGRCMD) is set as a target valve downstream pressure (PCMD) (step). By using the target fresh air amount (GAIRCMD), the EGR valve upstream pressure (PEGR), and the target valve downstream pressure (PCMD), the target EGR valve opening degree (LEGRCMD) is set (step), and an EGR valve () is controlled based on the target EGR valve opening degree (step).

A control apparatusfor the engine includes an ECU. When the operating region of the engine is in the EGR execution region B, the ECU performs the EGR control (step), and performs first coolant temperature control for controlling an IC coolant temperature TWic such that the temperature of intake air passing through an intercooler exceeds a dew-point temperature (step). Further, in a case where the operating region of the engine is in the EGR stop region C, the ECU performs second coolant temperature control for controlling the IC coolant temperature TWic such that the temperature of intake air having passed through the intercooler exceeds the dew-point temperature, assuming that the operating region of the engine has shifted to the EGR execution region B (step).

Control apparatus for internal combustion engine

Out of connection passages connecting the engine cooling circuit and the intercooler cooling circuit, a coolant inflow passage is connected between downstream of a mechanical pump and also upstream of a main radiator of the engine cooling circuit, and downstream of a sub radiator and also upstream of an electric pump of the intercooler cooling circuit, and a coolant outflow passage is connected between downstream of the electric pump and also upstream of the sub radiator of the intercooler cooling circuit, and downstream of the mechanical pump and also upstream of the main radiator of the engine cooling circuit. An inter-cooling circuit valve is provided in the coolant inflow passage.

Cooling control system for internal combustion engine

An ignition apparatus for an internal combustion engine, comprising at least one ignition plug, an actuating circuit provided with first and second coil pairs corresponding to one ignition plug for generating spark discharge in the at least one ignition plug. First and second ignition signals respectively supplied to the first and second coil pair are generated so that a first discharge period and a second discharge period partially overlap with each other during an overlap discharge period, the overlap discharge period is made equal to a set overlap period, and a start timing of the first discharge period is prior to a start timing of the second discharge period. The first and second discharge periods are time periods of electric discharges generated by the first and second coil pairs. The set overlap period is set according to the first discharge period, a temporary cut threshold value, and a discharge start current value at the start timing of the first discharge period. The temporary cut threshold value is a minimum value of the discharge current value at which no temporary cut of the discharge current in the ignition plug occurs.

Ignition apparatus for internal combustion engine

An ignition control device for an internal combustion engine, which controls the number of times of ignition operation such that it becomes neither too large nor too small, according to a flowing state of a mixture in a cylinder. In the ignition control device, a target ignition timing is used as an in-cylinder flow parameter indicative of the strength of a tumble flow generated in a cylinder. When the target ignition timing is more advanced than a predetermined reference position, it is determined that the tumble flow is strong, and multiple ignition control is executed by setting the number of times of ignition to a plurality of times, whereas when the former is more retarded than the latter, it is determined that the tumble flow is not strong, and normal ignition control is executed by setting the number of times of ignition to only once.

Ignition control device for internal combustion engine

An air-fuel ratio of an air-fuel mixture produced by fuel injected from a first injector into an intake port (or into a combustion chamber) is set in a range of 28 to 38. Therefore, when the temperature and pressure rise with a first combustion started by spark-ignition around a spark plug to the fuel injected from a second injector into the combustion chamber, the timing of starting a second compressive hypergolic ignition is optimized to provide a stable combustion state free of knocking and misfire.

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Wako, Japan

Noritaka Kimura