PROBLEM TO BE SOLVED: To provide a technology which can make compatible both coping with an increase of a temperature rise rate caused by the deterioration of a PCU, and the suppression of the mixing of air bubbles into a liquid refrigerant (air bite).SOLUTION: In a cooling system 11, a flow rate of a refrigerant is increased as a degree of the deterioration of a PCU becomes large, and on the other hand, when the acceleration of a hybrid vehicle is not smaller than a threshold ThG1 for A-rank acceleration which is preset according to the degree of the deterioration of the PCU (S22; Dp≥A, S26; Yes), a cooling controller decreases the flow rate of the refrigerant (S27). By this constitution, an increase of the flow rate caused by a rise of the degree of the deterioration of the PCU is offset. Accordingly, a liquid level height of a reservoir tank is not lowered, and even if a liquid level of the refrigerant in the reservoir tank is inclined due to the abrupt acceleration and abrupt steering of the hybrid vehicle, the liquid level is hardly lowered to a position which is lower than a discharge port. The intrusion of air from the discharge port is suppressed, and air bite is suppressed.SELECTED DRAWING: Figure 5
【課題】本明細書は、PCUの劣化による温度上昇率の増大に対応することと、液体冷媒に気泡が混入すること(エア噛み)を抑制することの両立を図る技術を提供する。【解決手段】冷却システム11では、冷却コントローラは、PCUの劣化度が高まるほど冷媒の流量を増加させる一方で、ハイブリッド車の加速度が、PCUの劣化の度合いに応じて予め定められたAランクの加速度用の閾値ThG1以上である場合には(S22;Dp≧A、S26;あり)、冷媒の流量を減少させる(S27)。これにより、PCUの劣化度が高まることによる流量の増大が相殺される。したがって、リザーブタンクの液面高さが下がらず、ハイブリッド車の急加速や急操舵によりリザーブタンクの冷媒の液面が斜めになっても、液面が排出口よりも低い位置に下がり難くなる。排出口から空気が入り込むことが抑えられエア噛みが抑制される。【選択図】図5
COOLING SYSTEM OF POWER CONVERTER
電力変換装置の冷却システム
2016-04-07
Patent
Electronic Resource
Japanese
IPC: | B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion / H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen |