Honda Motor Co., Ltd.

Kosuke Ihara

Hajime Uto

Noritaka Kimura

Yosuke Yamada

Masaki Ueno

Yuto Katori

Yoshikazu Tanaka

Yoshinori Matsuo

Masashi Hidaka

Takayoshi Nakamura

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

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

A cooling control system for an internal combustion engine, which is capable of circulating engine coolant while suppressing power consumption by an engine coolant pump as much as possible. The cooling control system is provided for cooling intake gases increased in temperature by being pressurized by a supercharger. The engine coolant pump of the electrically-driven type delivers engine coolant to thereby cause the same to circulate. An ECU controls, when a difference between the temperature of the engine coolant and a first target temperature is not larger than a first predetermined value, the amount of the engine coolant to be delivered to a predetermined minimum flow rate, and controls, when the difference is larger than the first predetermined value, the amount of the engine coolant to be delivered such that it becomes larger as the difference is larger.

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.

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Wako, Japan

Kosuke Ihara