Engine room temperature rise restricting apparatus

An engine room temperature rise restricting apparatus for restricting a temperature rise in an engine room of a vehicle, the vehicle including an engine, a continuously variable transmission configured to continuously change and output a rotating speed of an output shaft of the engine, and a grille shutter configured to open or close in accordance with an open or close instruction to allow or prohibit a flow of an outside air into the engine room in which the engine and the continuously variable transmission are installed,

• the engine room temperature rise restricting apparatus, comprising:
• an open and close detector configured to detect an open and close of the grille shutter;
• a stuck-closed failure detector configured to detect a stuck-closed failure of the grille shutter of a condition that the grille shutter remains closed regardless of the open instruction for the grille shutter, based on a signal from the open and close detector;
• and
• a speed ratio controller configured to control a speed ratio of the continuously variable transmission so that an upper limit of an engine rotational speed or an engine driving force when the stuck-closed failure is detected by the stuck-closed failure detector is smaller than an upper limit of the engine rotational speed or the engine driving force when the stuck-closed failure is not detected.

An engine room temperature rise restricting method for restricting a temperature rise in an engine room of a vehicle, the vehicle including an engine, a continuously variable transmission configured to continuously change and output a rotating speed of an output shaft of the engine, and a grille shutter configured to open or close in accordance with an open or close instruction to allow or prohibit a flow of an outside air into the engine room in which the engine and the continuously variable transmission are installed,

• the engine room temperature rise restricting method, comprising:
• determining whether a stuck-closed failure of the grille shutter of a condition that the grille shutter remains closed regardless of the open instruction for the grille shutter is detected;
• and
• controlling a speed ratio of the continuously variable transmission so that an upper limit of an engine rotational speed or an engine driving force when it is determined that the stuck-closed failure is detected is smaller than an upper limit of the engine rotational speed or the engine driving force when it is determined that the stuck-closed failure is not detected.