| 摘要 |
PURPOSE:To increase the blowing refrigerant quantity of a compressor, increase the air cooling ability, and smooth the engine revolution, by setting up an engine revolutions increasing mechanism as to be operated when a temperature controlling mechanism of the blowing air is adjusted to the coolest range. CONSTITUTION:When a blower air quantity controlling knob of a control panel 4 is switched from off-position to some optional air quantity selecting position, during the idling-driving, the contact point 51 of a power source relay 51 is closed and a blower motor 33b starts its rotation. Then, as the air conditioning switch 45 is turned on, the switch 54 is closed, an electromagnetic clutch 61 is energized, and a compressor 62 is engine-driven. At this time, if the temperature control lever 44 on a control panel 4 is selected in the coolest position, the switch 57 is closed, the electromagnetic coil 235 of a negative pressure switching valve 23 is energized, and the valve 233 is set on the position shown by the chain line. Consequently, a throttle valve 11 is opened by intake negative pressure, with an actuator 21, and the number of the engine revolution is increased. |
