An abnormality diagnostic device and an abnormality diagnostic method for a booster according to the present invention: determine that a negative pressure sensor operates normally, when an output of the negative pressure sensor changes in response to a decrease in intake pressure; determine that a negative pressure pump operates normally, when the pressure in a negative pressure chamber is decreased by operating the negative pressure pump, and the pressure decrease is determined by the negative pressure sensor determined to be normal; determine that the negative pressure pump is abnormal when the pressure decrease is not determined by the negative pressure sensor; and determine that a negative pressure leakage has occurred, when the pressure in the negative pressure chamber, which has been decreased by the negative pressure pump, is not maintained.


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    Title :

    Abnormality Diagnostic Device and Abnormality Diagnostic Method for Booster


    Contributors:

    Publication date :

    2020-01-09


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B60T Bremsanlagen für Fahrzeuge oder Teile davon , VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF




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