Patent US1148245A successfully refreshed from Google Patents.
US4699435A
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US
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Circuit arrangement for monitoring and controlling the pressure in the auxiliary pressure supply system of a hydraulic motor vehicle brake arrangement
Assignee: Continental Teves AG and Co OHG
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Filing: 1985-12-02
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Granted: 1987-10-13
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Expires: 2005-12-02
Abstract
Abstract To monitor and control the pressure in the auxiliary pressure supply system of a hydraulic motor vehicle brake system, a circuit arrangement is employed which is provided with a door-contact switch (24) which closes when the driver's door of the motor car is opened and which at a pressure in the auxiliary pressure supply system (11-16) below the telltale threshold activates the hydraulic pump (11) irrespective of the activation of the ignition. Moreover, a holding circuit (25, 26, 30, D30) is provided through which, after closure of the driver's door, the hydraulic pump (11) continues to operate until the telltale pressure threshold or responding threshold is reached or exceeded.
Inventors
- 👤 Hans Wupper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:52
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/18; B60T17/22; B60T17/02; B60T8/00; B60T8/32; B60T8/34; B60T8/40; B60T8/404
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
177 words
A circuit arrangement for monitoring and controlling the pressure in the auxiliary pressure supply system of a hydraulic motor car brake system which is furnished with a pressure accumulator and a hydraulic pump driven by electromotive force, activated and deactivated in response to pressure, and provided with telltale pressure circuit indicating the drop of the auxiliary pressure to below a predetermined telltale pressure threshold lower than the operating pressure range, said arrangement comprising a door-contact switch (24) closing during opening of the driver's door of the motor car and activating the hydraulic pump (11) at a pressure in the auxiliary pressure supply system (11-16) below the predetermined telltale threshold wherein said door contact (24), directly or by way of an auxiliary relay (25), drives a motor actuating relay (29) connected in series with pressure switch (17) which, in operating condition, activates and deactivates the hydraulic pump (11) pressure-responsively and wherein said door contact (24) is connected in series with a contact (19) of the telltale pressure circuit (18), closing when the pressure drops below the telltale threshold.
Claim 2
Dependent Claim
177 words
A circuit arrangement for monitoring and controlling the pressure in the auxiliary pressure supply system of a hydraulic motor car brake system which is furnished with a pressure accumulator and a hydraulic pump driven by electromotive force, activated and deactivated in response to pressure, and provided with telltale pressure circuit indicating the drop of the auxiliary pressure to below a predetermined telltale pressure threshold lower than the operating pressure range, said arrangement comprising a door-contact switch (24) closing during opening of the driver's door of the motor car and activating the hydraulic pump (11) at a pressure in the auxiliary pressure supply system (11-16) below the predetermined telltale threshold wherein said door contact (24), directly or by way of an auxiliary relay (25), drives a motor actuating relay (29) connected in series with pressure switch (17) which, in operating condition, activates and deactivates the hydraulic pump (11) pressure-responsively and wherein said door contact (24) is connected in series with a contact (19) of the telltale pressure circuit (18), closing when the pressure drops below the telltale threshold.
Claim 3
Dependent Claim
50 words
A circuit arrangement according to claim 1, further comprising a holding circuit (contact 26, diode D30) through which after closure of the driver's door and after opening of the door contact (24), respectively, the continued operation of the hydraulic pump (11) is maintained until a predetermined circuit threshold is reached.
Claim 4
Dependent Claim
59 words
A circuit arrangement according to claim 2, wherein the holding circuit comprises an auxiliary relay (25) connected in series with the door contact (24) and including a work contact (26) functionally connected in parallel to the door contact (24), by way of which work contact (26) the motor relay (29) can be actuated, and a holding current path (30).
Claim 5
Dependent Claim
22 words
A circuit arrangement according to claim 3, wherein the hydraulic pump (11) remains activated until a telltale pressure threshold has been reached.
Claim 6
Dependent Claim
27 words
A circuit arrangement according to claim 3, wherein the hydraulic pump (11) remains activated until a predetermined pressure level within the operating pressure range has been reached.
Claim 7
Dependent Claim
165 words
A circuit arrangement for monitoring and controlling the pressure in the auxiliary pressure supply system of a hydraulic motor car brake system which is furnished with a pressure accumulator and a hydraulic pump driven by electromotive force, activated and deactivated in response to pressure, and provided with telltale pressure circuit indicating the drop of the auxiliary pressure to below a predetermined telltale pressure threshold lower than the operating pressure range, said arrangement comprising a door-contact switch (24) closing during opening of the driver's door of the motor car and activating the hydraulic pump (11) at a pressure in the auxiliary pressure supply system (11-16) below the predetermined telltale threshold, and further comprising a holding circuit comprising a timer unit activated by one of opening or closing the driver's door or by actuating the door contact, by way of which holding circuit the hydraulic pump (11) remains activated for a predetermined period of time as long as the hydraulic pressure is below the maximum operating pressure.
Claim 8
Dependent Claim
165 words
A circuit arrangement for monitoring and controlling the pressure in the auxiliary pressure supply system of a hydraulic motor car brake system which is furnished with a pressure accumulator and a hydraulic pump driven by electromotive force, activated and deactivated in response to pressure, and provided with telltale pressure circuit indicating the drop of the auxiliary pressure to below a predetermined telltale pressure threshold lower than the operating pressure range, said arrangement comprising a door-contact switch (24) closing during opening of the driver's door of the motor car and activating the hydraulic pump (11) at a pressure in the auxiliary pressure supply system (11-16) below the predetermined telltale threshold, and further comprising a holding circuit comprising a timer unit activated by one of opening or closing the driver's door or by actuating the door contact, by way of which holding circuit the hydraulic pump (11) remains activated for a predetermined period of time as long as the hydraulic pressure is below the maximum operating pressure.
Claim 9
Dependent Claim
25 words
A circuit arrangement according to claim 6 further comprising a switch (28) interrupting the activation of the hydraulic pump (11) during actuation of the starter.
References Cited (Backward Citations)
US1448469A
Cited
US3549207A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-12 | 1991-04-13 | 1991-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-12 | 1995-04-13 | 1995-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-12 | 1999-04-13 | 1999-10-13 | $7700.00 | Window Closed / Lapsed |