US3795425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic braking system
Assignee: DBA SA
•
Filing: 1972-05-24
•
Granted: 1974-03-05
•
Expires: 1992-05-24
Abstract
Abstract The invention relates to an electronic anti-skid system which avoids the untimely operating of the system which occurs especially further to the aleatory variations of the wheel speed. A given percentage of the output voltage of a wheel speed sensor is memorized in a capacitor by means of a diode, as soon as the wheel decelerates. The exhaust signal which is given at the output of an anti-skid logic circuitry is transmitted to a transistor only when the wheel speed has decreased of an amount equal to the complementary percentage of the given percentage. The resetting of the devices is effected by another diode which deletes the memorized voltage of the capacitor.
Inventors
- 👤 G Marouby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:09
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1761; B60T8/17613; B60T8/173
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
251 words
An electronic braking system for at least one wheel, said system including at least one wheel speed sensor delivering a voltage which represents the speed of said wheel, an anti-lock unit which is supplied with said wheel speed voltage and which in turn delivers an anti-lock signal, braking means associated with said at least one wheel and responsive to said anti-lock signal to decrease the braking force, and means for inhibiting said anti-lock signal, said inhibiting means including memorizing means memorizing a given percentage of the maximum value of said wheel speed voltage preceding the advent of said anti-lock signal, comparison means comparing said memorized voltage to said wheel speed voltage and controlling said inhibiting means so that said anti-lock signal is inhibitied as long as said wheel speed voltage is superior to said memorized voltage, and cancelling means deleting said memorized voltage as soon as said wheel speed voltage becomes inferior to a given amount to said memorized voltage; said memorizing means including energy storage means and means charging said energy storage means to a value corresponding to said given percentage of said wheel speed voltage as long as said wheel speed voltage increases, said canCelling means including means preventing decrease of the value stored in said energy storage means until said wheel speed voltage decreases below the corresponding value stored in said energy storage means by said given amount, whereupon the value stored in said energy storage means decreases in proportion of the decrease in said wheel speed voltage.
Claim 2
Dependent Claim
251 words
An electronic braking system for at least one wheel, said system including at least one wheel speed sensor delivering a voltage which represents the speed of said wheel, an anti-lock unit which is supplied with said wheel speed voltage and which in turn delivers an anti-lock signal, braking means associated with said at least one wheel and responsive to said anti-lock signal to decrease the braking force, and means for inhibiting said anti-lock signal, said inhibiting means including memorizing means memorizing a given percentage of the maximum value of said wheel speed voltage preceding the advent of said anti-lock signal, comparison means comparing said memorized voltage to said wheel speed voltage and controlling said inhibiting means so that said anti-lock signal is inhibitied as long as said wheel speed voltage is superior to said memorized voltage, and cancelling means deleting said memorized voltage as soon as said wheel speed voltage becomes inferior to a given amount to said memorized voltage; said memorizing means including energy storage means and means charging said energy storage means to a value corresponding to said given percentage of said wheel speed voltage as long as said wheel speed voltage increases, said canCelling means including means preventing decrease of the value stored in said energy storage means until said wheel speed voltage decreases below the corresponding value stored in said energy storage means by said given amount, whereupon the value stored in said energy storage means decreases in proportion of the decrease in said wheel speed voltage.
Claim 3
Dependent Claim
60 words
An electronic braking system according to claim 1, characterized in that said energy storage means includes a capacitor, said means charging said energy storage means includes a resistor divider supplied with said wheel speed voltage and having a middle terminal connected to said capacitor for charging the latter, and a first diode connected between said middle terminal and said capacitor.
Claim 4
Dependent Claim
66 words
An electronic braking system according to claim 2, characterized in that said comparison means include a transistor differential amplifier which inputs receive, on the one hand, said wheel speed voltage through a second diode similar to said first diode, and on the other hand, said memorized voltage, the output signal of said differential amplifier being amplified by a transistor and the latter controlling said inhibition means.
Claim 5
Dependent Claim
218 words
An electronic braking system for at least one wheel, said system including at least one wheel speed sensor delivering a voltage which represents the speed of said wheel, an anti-lock unit which is supplied with said wheel speed voltage and which in turn delivers an anti-lock signal, braking means associated with said at least one wheel and responsive to said anti-lock signal to decrease the braking force, and means for inhibiting said anti-lock signal, said inhibiting means inhibiting memorizing means memorizing a given percentage of the maximum value of said wheel speed voltage preceding the advent of said anti-lock signal, comparison means comparing said memorized voltage to said wheel speed voltage and controlling said inhibiting means so that said anti-lock signal is inhibited as long as said wheel speed voltage is superior to said memorized voltage, and cancelling means deleting said memorized voltage as soon as said wheel speed voltage becomes inferior to a given amount to said memorized voltage; said memorizing means including a resistor divider supplied with said wheel speed voltage and which middle terminal charges a capacitor through a first diode; said cancelling means including a third diode which is connected from the common terminal of said capacitor and said first diode to the supply terminal of said divider, and which conducts in this way.
Claim 6
Dependent Claim
218 words
An electronic braking system for at least one wheel, said system including at least one wheel speed sensor delivering a voltage which represents the speed of said wheel, an anti-lock unit which is supplied with said wheel speed voltage and which in turn delivers an anti-lock signal, braking means associated with said at least one wheel and responsive to said anti-lock signal to decrease the braking force, and means for inhibiting said anti-lock signal, said inhibiting means inhibiting memorizing means memorizing a given percentage of the maximum value of said wheel speed voltage preceding the advent of said anti-lock signal, comparison means comparing said memorized voltage to said wheel speed voltage and controlling said inhibiting means so that said anti-lock signal is inhibited as long as said wheel speed voltage is superior to said memorized voltage, and cancelling means deleting said memorized voltage as soon as said wheel speed voltage becomes inferior to a given amount to said memorized voltage; said memorizing means including a resistor divider supplied with said wheel speed voltage and which middle terminal charges a capacitor through a first diode; said cancelling means including a third diode which is connected from the common terminal of said capacitor and said first diode to the supply terminal of said divider, and which conducts in this way.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |