Hitachi Automotive Systems, Ltd.

Shigeyuki Sakaguchi

Atsushi Murai

Yuichi Toyama

Masahiko Watanabe

Tomoyuki Murakami

Hideaki Nakamura

The cooling device according to the present invention includes an electric water pump for circulating cooling water through an internal combustion engine of a vehicle, and controls the discharge flow rate of the electric water pump as follows. Until the cooling water temperature. TW reaches a warm-up completion determination temperature, the cooling device increases the discharge flow rate along with an increase of the cooling water temperature TW. After the cooling water temperature TW reaches the warm-up completion determination temperature, the cooling device controls the discharge flow rate so as to bring the combustion chamber wall temperature TCYL toward a target temperature. Thereby, the cooling device can warm up the internal combustion engine more efficiently, and improve the combustion performance of the internal combustion engine after the completion of warm-up.

Cooling device for internal combustion engine of vehicle and control method thereof

The present invention provides a cooling device for an internal combustion engine of a vehicle. While the vehicle is in a decelerating state and while the internal combustion engine is in an idle reduction state, the cooling device increases the ratio of the cooling water circulation rate through a first path which extends through a heater core and a radiator while reducing the ratio of the cooling water circulation rate through a second path which bypasses the heater core and radiator. In addition, the cooling device increases the discharge flow rate of the electric water pump while the vehicle is in a decelerating state, and maintains the electric water pump in an operating state during idle reduction. Thus, the present invention allows accelerating the temperature decrease of the cylinder head during idle reduction, as well as improving fuel economy during acceleration when the vehicle is started.

In a control device for an internal combustion engine and a method of estimating a combustion chamber-wall temperature of an internal combustion engine of the invention, a difference between a wall temperature of the combustion chamber and a cooling water temperature is set according to an integrated value of the intake air amount of the internal combustion engine after start of the fuel-cut, and the estimated value of the wall temperature of the combustion chamber during the fuel-cut is obtained based on the difference and the cooling water temperature.

Control device for internal combustion engine and method of estimating combustion chamber-wall temperature of internal combustion engine

The present invention provides a cooling system for an internal combustion engine, comprising: a flow channel switching valve for switching between a plurality of cooling water channels at least including a heater line for air heating, a block line for cooling an engine block, and a transmission line for an oil warmer of a transmission so as to sequentially open at least one of the plurality of cooling water channels in accordance with a warm-up state of the internal combustion engine; and a control device for controlling opening and closing of the flow channel switching valve so as to restrict a cooling water distribution rate of the heater line. The cooling system allows acceleration of cooling water temperature recovery from a temporary drop.

Cooling system for internal combustion engine, and control method thereof

A cooling device for an internal combustion engine of a vehicle according to the claimed invention includes: an electric water pump; a first path including a cooling water passage in a cylinder head and extending through a heater core for air heating and a radiator; and a second path bypassing the heater core and radiator. When the internal combustion engine is automatically stopped while the vehicle is stopping, the cooling device causes the electric water pump to operate, and increases the cooling water circulation ratio through the first path while reducing the cooling water circulation ratio through the second path. Thereby, the cooling device improves fuel economy during acceleration at the vehicle start from the automatic stop state of the internal combustion engine while suppressing the deterioration of the air heating performance during the automatic stop of the internal combustion engine while the vehicle is stopping.

A cooling system of an internal combustion engine includes a flow channel switching valve for sequentially switching between a plurality of cooling water passages so as to distribute cooling water to at least one cooling water passage. When a control device for the cooling system switches between the cooling water passages by controlling the flow channel switching valve in accordance with the progress of warm-up of the internal combustion engine, the control device suppresses the distribution rate of the cooling water to the cooling water passage to which the distribution of the cooling water is just started.

Control device and method for cooling system

The present invention relates to a cooling control apparatus which performs control for cooling an internal combustion engine by causing an electric pump to circulate cooling water and causing an electric fan to supply cooling air to a radiator. The cooling control apparatus comprises an electric pump for circulating a coolant through a coolant passage formed in the internal combustion engine, and a radiator and a radiator fan which are for cooling the coolant. When the internal combustion engine stops after completion of warming-up, the radiator fan and the electric pump are driven to cool the internal combustion engine, and when a temperature of the coolant decreases to less than a temperature at a time of engine stop, the radiator fan is stopped in a state in which the electric pump is operated.

Cooling control apparatus for internal combustion engine and cooling control method therefor

The present invention relates to a cooling device of internal combustion engine for vehicle and a control method thereof. The cooling device according to the present invention includes: an electric water pump; a bypass line bypassing a radiator; and a flow rate control valve for controlling a flow rate of cooling water circulating through the bypass line. During a low external air temperature state where the external air temperature is below a threshold, the cooling device increases the temperature of the cooling water by increasing the flow rate of the cooling water circulating through the bypass line as compared to during a high external air temperature state where the external air temperature is above the threshold, and increases a circulation flow rate of the cooling water by increasing a discharge flow rate of the electric water pump as compared to during the high external air temperature state.

Cooling device of internal combustion engine for vehicle and control method thereof

The present invention relates to a cooling device and a control method therefor. This cooling device includes: a first cooling liquid line routed by way of a cylinder head and a radiator; a second cooling liquid line routed by way of a cylinder block while bypassing the radiator; a third cooling liquid line routed by way of the cylinder head and a heater core while bypassing the radiator; a flow rate control valve for distributing cooling water to the cooling liquid lines; and mechanical and electric water pumps. A control unit controls the flow rate control valve according to the temperatures of the cylinder head and block, during engine operation, and causes the electric water pump to operate while controlling the flow rate control valve according to the temperature of the cylinder head, and whether or not heat exchange in the heater core is requested, during temporary engine stop.

Cooling device for internal combustion engine and control method for cooling device

The present invention relates to a cooling device and a control method for the same. This cooling device includes: a first cooling liquid line routed by way of a cylinder head and a radiator; a second cooling liquid line routed by way of a cylinder block while bypassing the radiator; an electric flow rate control valve whose inlet is connected to the first and second cooling liquid lines, and whose outlet is connected to the intake side of an electric water pump; and a bypass line that branches off from the first cooling liquid line at a point between the cylinder head and the radiator and that joins to the outlet of the flow rate control valve while bypassing the radiator. A control unit controls the flow rate control valve according to the temperature of the cylinder head and the temperature of the cylinder block.

Growing community of inventors

Isesaki, Japan

Shigeyuki Sakaguchi