The invention relates to a leak diagnostic system (4) and a method for an oil tank (3) of a vehicle (2), said leak diagnostic system comprising at least one first (5) and one second (6) connection point, each connection point being designed to be connected to said oil tank (3) or to be open to the environment (1); at least one diaphragm pump (7) designed to convey a fluid from the first connection point (5) to the second connection point (6); at least one ventilation valve (8) connected in parallel with the diaphragm pump (7) between the first connection point (5) and the second connection point (6) and designed to switch to a first position (8a) in which the first connection point (5) and the second connection point (6) are fluidly connected, and to switch to a second position (8b) in which the first connection point (5) and the second connection point (6) are fluidly connected, a second position (8b) which prevents a flow of fluid at least from the second connection point (6) to the first connection point (5), and at least one evaluation unit (9) which is designed to operate the diaphragm pump (7), switch the ventilation valve (8) to a second position (8b) and determine a pressure (curve) in the tank (3), in order to deduce from the pressure (curve) whether there is a leak in the tank. The evaluation unit (9) is designed to detect an electrical signal of the diaphragm pump (7), a pressure generated by the diaphragm pump (7), in particular by means of at least one pressure sensor (16, 17, 19), and to determine whether the diaphragm pump (7) is faulty by means of the electrical signal and the detected pressure.

    本发明涉及一种用于车辆(2)的油箱(3)的泄漏诊断系统(4)和方法,所述泄漏诊断系统包括至少一个第一连接点(5)和第二连接点(6),每个连接点被设计成连接到所述油箱(3)或向环境(1)开放;至少一个隔膜泵(7),所述隔膜泵被设计为将流体从所述第一连接点(5)输送至所述第二连接点(6);至少一个通风阀(8),所述通风阀在所述第一连接点(5)和所述第二连接点(6)之间与所述隔膜泵(7)并联连接,并且被设计成切换到第一位置(8a),在所述第一位置中所述第一连接点(5)和所述第二连接点(6)流体连接,并且切换到第二位置(8b),所述第二位置防止流体至少从所述第二连接点(6)流动到所述第一连接点(5),以及至少一个评估单元(9),所述评估单元被设计成操作所述隔膜泵(7)、将所述通风阀(8)切换至第二位置(8b)并确定油箱(3)中的压力(曲线),以便从压力(曲线)推断所述油箱中是否存在泄漏。所述评估单元(9)被设置为,检测所述隔膜泵(7)的电信号、由所述隔膜泵(7)特别是通过至少一个压力传感器(16、17、19)产生的压力,并且借助所述电信号和检测到的压力来确定所述隔膜泵(7)是否存在故障。


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    Title :

    Vehicle fuel tank leakage diagnosis method and leakage diagnosis system


    Additional title:

    车辆油箱泄漏诊断方法和泄漏诊断系统


    Contributors:

    Publication date :

    2024-11-22


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    F02M Zuführen von Brennstoff-Luft-Gemischen oder deren Bestandteilen bei Brennkraftmaschinen allgemein , SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / F04B Verdrängerkraft- und Verdrängerarbeitsmaschinen für Flüssigkeiten , POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS / G01M TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES , Prüfen der statischen oder dynamischen Massenverteilung rotierender Teile von Maschinen oder Konstruktionen



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