Nippon Thermostat Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Daisuke Tsukamoto

Hiroshi Suda

Mitsuhiro Sano

Masahiro Aburakawa

Norio Suda

Hiroyasu Koyama

Fujio Inoue

Susumu Mikami

A molded plastic article having a bonded plastic portionbonding a first body and a second body together; a connecting plastic portion, formed by solidifying the molten plastic flowing out from the plastic channel, having one end connected to the bonding plastic portion; and a flow tab plastic portionformed by solidifying the molten plastic, connected to the other end of the connecting plastic portionconnected to the other end portion of the. A portion of reduced diameteris provided to the flow tab plastic portionon the connecting plastic portion side.

Molded plastic article and method of manufacturing same

A coolant passage deviceincludes coolant intake pipesandthat take in coolant from an engine, a delivery pipeto a radiator communicating with the coolant intake pipes, and a delivery pipeto the heater core branched from a central passageconnecting the coolant intake pipes with the delivery pipe to the radiator. A branch portleading to the delivery pipeto the heater core is opened in an upper portion in the central passagein a state where the coolant passage deviceis mounted to the engine, and the branch porthas a wall surfacesurrounding the branch port and hanging down into the central passage. The wall surfaceprevents bubbles contained in the coolant from entering the branch port. And the coolant passage device consequently prevents coolant flow noise from occurring.

Coolant passage device for internal combustion engine

An electronically controlled thermostat control method is obtained which makes it possible to eliminate the response delay from the time that the required cooling water temperature is set to the time that the actual cooling water temperature reaches the set water temperature by controlling the flow rate, and to realize high cooling water temperature tracking characteristics with a high degree of precision at a low cost. The method of the present invention is characterized in that in an electronically controlled thermostat which is used to control the cooling water temperature of an engine, and which comprises an actuator that can arbitrarily vary the degree of valve opening without depending only on the actual cooling water temperature, the actuator is controlled by the control controller, which has means for calculating the elapsed time from the powering of the actuator to the variation of the water temperature for predicting the water temperature after the elapsed time when the cooling water temperature is controlled to an arbitrarily set water temperature, and the actuator is controlled in advance in accordance with the above-described predicted water temperature.

Method of controlling electronic controlled thermostat

A method for controlling an electronically controlled thermostat provided in a cooling system of an internal combustion engine includes predicting a thermal radiation amount of a radiator when a water temperature of engine cooling water is stabilized at a second set temperature or at a first set temperature without detecting the water temperature not to cause temperature hunting, when the water temperature is controlled from a first set temperature to the second set temperature lower than the first set temperature or from the second set temperature to the first set temperature. The electronically controlled thermostat is controlled in accordance with the predicted thermal radiation amount.

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Tokyo, Japan

Daisuke Tsukamoto