PROBLEM TO BE SOLVED: To make it possible to ensure that a vacuum pump stops operating even when a vehicle is present in a location at a low atmospheric temperature.SOLUTION: A pump ECU starts actuating a vacuum pump when a booster negative pressure ΔP is not higher than a pump-actuation start threshold ΔPstart (S11 to S13). The pump ECU calculates a negative-pressure increase gradient ΔP' that represents the increase gradient of the booster negative pressure ΔP, and stops actuating the vacuum pump when the negative-pressure increase gradient ΔP' is not greater than a stop gradient threshold ΔP'stop (S14 to S17).SELECTED DRAWING: Figure 2
【課題】 車両が大気圧の低い場所にいる場合でも、確実にバキュームポンプの作動を停止させることができるようにする。【解決手段】 ポンプECUは、ブースタ負圧ΔPがポンプ作動開始閾値ΔPstart以下になるとバキュームポンプの作動を開始させる(S11〜S13)。ポンプECUは、ブースタ負圧ΔPの増加勾配を表す負圧増加勾配ΔP’を演算し、負圧増加勾配ΔP’が停止勾配閾値ΔP’stop以下になったときに、バキュームポンプの作動を停止させる(S14〜S17)。【選択図】 図2
ELECTRIC VACUUM PUMP CONTROL UNIT
電動式バキュームポンプの制御装置
2016-04-04
Patent
Electronic Resource
Japanese
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