To make it possible to estimate atmospheric pressure while dispensing with an atmospheric pressure sensor.SOLUTION: A negative pressure supply device 1 for a brake booster 3 mounted on a vehicle and transmitting a pedal stepping force to a master cylinder 2 by increasing the pedal stepping force includes: an electric vacuum pump 4 for supplying a negative pressure to a negative pressure chamber 33; a relative pressure sensor for detecting a differential pressure (relative pressure) of the pressure of the negative pressure chamber 33 with respect to the pressure of an atmospheric pressure chamber 34; and a control device 5 for controlling the electric vacuum pump. The control device 5 estimates an atmospheric pressure (altitude) on the basis of the operation time of the electric vacuum pump 4 and the relative pressure detected by the relative pressure sensor 6 after the operation time of the electric vacuum pump 4 has elapsed.SELECTED DRAWING: Figure 1
【課題】大気圧センサを不要化しながらも大気圧を推定可能とする。【解決手段】車両に搭載されかつペダル踏力を増大してマスタシリンダ2に伝達するブレーキブースタ3の負圧供給装置1であって、負圧室33に負圧を供給する電動バキュームポンプ4と、大気圧室34の圧力に対する負圧室33の圧力の差圧(相対圧)を検出する相対圧センサと、電動バキュームポンプを制御する制御装置5と、を有し、制御装置5は、電動バキュームポンプ4の作動時間と、電動バキュームポンプ4の前記作動時間の経過後において相対圧センサ6で検出した相対圧とに基づいて大気圧(標高)を推定する。【選択図】図1
NEGATIVE PRESSURE SUPPLY DEVICE FOR BRAKE BOOSTER
ブレーキブースタの負圧供給装置
2024-07-04
Patent
Electronic Resource
Japanese
IPC: | B60T Bremsanlagen für Fahrzeuge oder Teile davon , VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF |
Noise reduction device for negative pressure line of brake booster
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