| 摘要 |
PURPOSE:To reduce any cooling loss and improve fuel consumption by connecting a branch conduit having a thermostat valve for setting high temperature in parallel to a branch conduit having a thermostat valve for setting low temperature and a switching valve for releasing itself under high loads. CONSTITUTION:A cooling water conduit 3x between the exit side of an engine 1 and a radiator 2 is divided on its way into the first branch conduit 3a and the second branch conduit 3b. A bypass conduit 7 is communicated to the first branch conduit 3a on the direct upstream side of a thermostat valve 5 for setting thigh temperature (about 100 deg.C). A thermostat valve 6 for setting low temperature (about 82 deg.C) is provided in the second branch conduit 3b and a switching valve 9 is arranged in series on the downstream side thereof. The switching valve 9 is controlled by means of ECU 16 provided with a load sensor 17 connected thereto and vacuum is introduced during high load operation via a three way solenoid valve 14 in order that the second branch conduit 2b is released. |
