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AssigneeContinental Teves AG & Co. oHG
InventorsRüdiger Briesewitz, Joseph Dolmaya
Estimating the term…
To check the functionality/leak-tightness of a brake-by-wire brake system, a motor-operated brake pressure transducer is actuated. In this case, a pressure medium would flow out into a reservoir via a master brake cylinder. A diagnostic valve is therefore provided between the master brake cylinder and the reservoir, which diagnostic valve is composed of a check valve and a restrictor connected in parallel with respect to the check valve. The outflow of pressure medium is limited by the restrictor. Because the gradient of the pressure dissipation can be calculated, a measured pressure build-up can be compared with that which is to be expected, and a determination of functionality/leak-tightness can be derived from the comparison.
A brake-by-wire brake system which has at least one brake circuit, the brake-by-wire brake system having a pedal-actuated master brake cylinder, to which the brake circuit is hydraulically connected via a normally open isolation valve, having an electromotively actuatable brake pressure transducer to which the brake circuit is connected via a normally closed brake valve, and having a reservoir which is connected both to the master brake cylinder and via a suction valve to the brake pressure transducer, wherein, in the connection between the reservoir and the master brake cylinder, there is incorporated a diagnostic valve which is composed of a check valve, which blocks in the direction of the reservoir, and of a restrictor connected in parallel with respect to said check valve, and wherein the diagnostic valve is accommodated in a connection bore, which is situated in the wall of the master brake cylinder, for receiving a connector of the reservoir.
A diagnostic valve, which is composed of a check valve, a restrictor, and a filter body, wherein said diagnostic valve is composed of a valve housing with a valve passage, which has a sealing seat and a valve closing body which can be placed sealingly against the sealing seat, wherein the valve closing body has a through-extending channel with a narrowed restrictor cross section and the channel opens into the valve passage, and wherein the valve closing body includes an upper cylindrical portion facing the filter body and a dome-shaped portion provided on the upper cylindrical portion facing the filter body, wherein the restrictor cross section is situated in a zenith of the dome-shaped portion.
Dependencies are inferred from the claim text.