To facilitate effective thawing of urea water.SOLUTION: A circulation system includes: a fist coolant circuit 10; a second coolant circuit 50 including a circulation passage 51; a water pump 61 disposed in the circulation passage 51; a heating device 62 disposed in the circulation passage 51; a urea water heating part 63 disposed in the circulation passage 51; an introduction flow passage 52 for introducing a coolant to the circulation passage 51 from the fist coolant circuit 10; a lead-out passage 53 for leading out the coolant to the fist coolant circuit 10 from the circulation passage 51; a first valve 67 capable of switching to a communication state allowing communication between the introduction flow passage 52 and circulation passage 51 or to a shutoff state shutting from the former to the latter; and a second valve 68 capable of switching to a communication state allowing communication between the circulation passage 51 and lead-out passage 53 or to a shutoff state shutting from the former to the latter. Further, the first and second valves 67, 68 are maintained in the shutoff state until a coolant temperature reaches a threshold value from an engine start.SELECTED DRAWING: Figure 1
【課題】尿素水の解凍を効果的に促進させる。【解決手段】第1冷却水回路10と、循環流路51を含む第2冷却水回路50と、循環流路51に設けられたウォータポンプ61と、循環流路51に設けられた加熱装置62と、循環流路51に設けられた尿素水加熱部63と、第1冷却水回路10から循環流路51に冷却水を導入する導入流路52と、循環流路51から第1冷却水回路10に冷却水を導出する導出流路53と、導入流路52と循環流路51とを連通させる連通状態又は遮断する遮断状態に切り替え可能な第1バルブ67と、循環流路51と導出流路53とを連通させる連通状態又は遮断する遮断状態に切り替え可能な第2バルブ68とを備え、第1及び第2バルブ67,68は、エンジン始動から冷却水温が閾値温度に達するまでの間は遮断状態に維持される。【選択図】図1
COOLANT CIRCULATION SYSTEM AND CONTROL METHOD FOR COOLANT CIRCULATION SYSTEM
冷却水循環システム及び、冷却水循環システムの制御方法
2019-11-21
Patent
Electronic Resource
Japanese
IPC: | F01N GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL , Schalldämpfer oder Auspuffvorrichtungen für Gase von Kraft- und Arbeitsmaschinen oder von Kraftmaschinen allgemein / B60H ARRANGEMENTS OR ADAPTATIONS OF HEATING, COOLING, VENTILATING, OR OTHER AIR-TREATING DEVICES SPECIALLY FOR PASSENGER OR GOODS SPACES OF VEHICLES , Anordnung oder Einbau der Heizung, Kühlung, Lüftung oder anderer Luftbehandlungsvorrichtungen für die Fahrzeugräume für Reisende oder Fracht / F01P Kühlung von Kraft- und Arbeitsmaschinen oder Kraftmaschinen allgemein , COOLING OF MACHINES OR ENGINES IN GENERAL |