| 摘要 |
PURPOSE:To alarm an engine over heat by limiting the air conditioning and increasing compulsorily an amount of air passing through a heater core when the over heat condition is detected based on a temperature of an engine of a car. CONSTITUTION:A heater core 4 is installed inside an air duct 1 of an automobile air conditioning control device, which guides engine cooling water and over heats blower air. It also blows a warm wind into a car room 6. In this case, when a cooling water temperature sensor 14 detects a extraordinarily high temperature due to over heat of a engine, the signal is fed into a microcomputer 16 through an A/D converter 15 and the microcomputer judges the over heat. Though a valve driving circuit 21, the signal makes an electromagnetic valve 9 open and a valve 8 kept in a opening state. While controlling to set an air mix damper 5 at the maximum air heating position and a blower motor 2 at the maximum speed, the over heat appeals to bodily sensation of car crew-members. |
