Toyota Jidosha Kabushiki Kaisha

Daishi Takahashi

Shinichiro Nogawa

Yuji Miyoshi

Satoko Tofukuji

Yoshihiro Furuya

Nobuki Kawamoto

An EGR device is operated and EGR is executed, when a temperature of a first cooling water that cools a cylinder block and a cylinder head is higher than an EGR allowable temperature, and a working point of the internal combustion engine that is fixed by a load and an engine speed is in an EGR execution region. The EGR execution region is variable with respect to a temperature of the second cooling water (the temperature of the second cooling water is lower than the first cooling water) that cools the intake port, and the EGR execution region is narrowed to a high load side in a case where the temperature of the second cooling water is lower than a threshold value temperature, as compared with a case where the temperature of the second cooling water is higher than the threshold value temperature.

Control device for internal combustion engine

High temperature (HT) and low temperature (LT) cooling water, the LT cooling water being at a lower temperature than the HT cooling water, circulate in HT and LT cooling water flows in respective channels. A controller controls to set the temperature of the LT cooling water lower in a case where an operating point of an engine lies in a particular region in an operational region of the engine, the particular region including a region in which the load is high and the engine speed is low, than in a case where the operating point lies in an operational region other than the particular region. Furthermore, the controller narrows the particular region in a direction toward higher loads in a case where the temperature of the HT cooling water is lower than a predetermined temperature.

Cooling device for internal combustion engine

The cooling device is provided with an engine including a cylinder block, a cylinder head, and a W/J which is a single system as a whole and which causes coolant to flow from the cylinder block to the cylinder head. The W/J branches into first and second inner paths within the cylinder block, and joints together within the cylinder head. The first inner path is provided with an opening and closing valve for permitting and prohibiting the flow of the coolant based on the pressure of the coolant.

Engine cooling device

A cooling apparatusA includes an engineA having a cylinder headA having a head side W/JA equipped with partial W/JA throughA individually incorporated into four different cooling systems, first recess/projection portions P capable of generating a flow separation of cooling water in accordance with a change of the flow rate within a range of a maximum flow rate of the cooling water being provided to the head side W/JA, and control means for executing a control of changing the flow rate of the cooling water that flows through the first cooling medium passageway in accordance with operating conditions of the engine including a case where the control means partially changes in each of the plurality of the partial cooling medium passageways.

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Kanagawa-ken, Japan

Daishi Takahashi