US3614564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Readhesion apparatus for vehicles
Assignee: Hitachi Ltd
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Filing: 1968-07-22
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Granted: 1971-10-19
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Expires: 1988-07-22
Abstract
Abstract A readhesion apparatus for vehicles for detecting an increment of velocity resulting from a slip caused to a vehicle wheel adapted to make the output of a driving motor follow a reference value, applying the detected value to a transducer which exhibits different time constants when input variation is increasing and when it is decreasing, and reducing the reference value in accordance with an output from said transducer, whereby readhesion of the wheel is enhanced.
Inventors
- 👤 Tetsuji Hirotsu
- 👤 Hisao Sonobe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:28
CPC Classifications
B; B60; B60L; B60L3/00; B60L3/10; B60L2200/00; B60L2200/26
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
177 words
A readhesion apparatus for vehicles comprising: first means fOr detecting a quantity depending on an axle velocity variation produced when a wheel shifts from adhesion state into nonadhesion state, applying said detected value to a transducer, and reducing a reference value in accordance with an output obtained from said transducer; second means for detecting an output of a vehicle drive motor and comparing the detected output with said reduced reference value third means for applying a signal from said second means to said driving motor to thereby control the output of said vehicle driving motor so that it follows said reduced reference value, said transducer exhibiting a first very small time constant when input variation is increasing and a second time constant sufficiently greater than said first time constant when said input variation is decreasing. CM,2Dhesion apparatus for vehicles according to claim 1, wherein said quantity depending on the axle velocity variation is a quantity depending on a deviation between the quantities of electricity related to the respective velocities of an adhesion axle and a nonadhesion axle.
Claim 2
Dependent Claim
23 words
A readhesion apparatus for vehicles according to claim 2, wherein said quantity depending on said deviation is the differential value of said deviation.
Claim 3
Dependent Claim
26 words
A readhesion apparatus for vehicles according to claim 2, wherein said quantity on said deviation is the sum of said deviation and the differential value thereof.
Claim 4
Dependent Claim
55 words
A readhesion apparatus for vehicles according to claim 1, wherein said transducer includes a capacitor having a charging circuit comprising a resistor providing said first time constant and a diode inserted so as to assume the forward direction with respect to charging current, and a discharging circuit comprising a resistor providing said second time constant.
Claim 5
Dependent Claim
125 words
A traction control apparatus for regulating the power supplied to motor driven vehicle wheels to maintain said wheels in a traction condition comprising traction detection means for generating a slip signal having a value corresponding to a detected amount of slip in a vehicle wheel, first means for adjusting the value of a reference signal in accordance with the value of said slip signal, and control means for controlling the output of the driving motor for said vehicle wheel in accordance with the difference between said adjusted reference signal and the output of said driving motor, said first means providing a very small time constant for increasing values of said slip signal and a relatively greater time constant for decreasing values of said slip signal.
Claim 6
Dependent Claim
125 words
A traction control apparatus for regulating the power supplied to motor driven vehicle wheels to maintain said wheels in a traction condition comprising traction detection means for generating a slip signal having a value corresponding to a detected amount of slip in a vehicle wheel, first means for adjusting the value of a reference signal in accordance with the value of said slip signal, and control means for controlling the output of the driving motor for said vehicle wheel in accordance with the difference between said adjusted reference signal and the output of said driving motor, said first means providing a very small time constant for increasing values of said slip signal and a relatively greater time constant for decreasing values of said slip signal.
Claim 7
Dependent Claim
117 words
A traction control apparatus as defined in claim 6, wherein said first means includes a transducer connected to the output of said traction detection means for converting said slip signal to a control signal varying in accordance with the time constant of the transducer and a first comparator for adjusting the value of a reference signal in accordance with the value of said control signal, said control means including a second comparator connected to the output of said first comparator and a current detector applying an output corresponding to the driving current of said motor to said second comparator, the output of said second comparator providing a signal for controlling the power supplied to said driving motor.
Claim 8
Dependent Claim
46 words
A traction control apparatus as defined in claim 7, wherein said transducer comprises a capacitor connected to a charging resistor and a discharging resistor, said discharging resistor being connected to a pair of transistors connected in Darlington configuration, said charging and discharging resistors having different values.
Claim 9
Dependent Claim
74 words
A traction control apparatus as defined in claim 7, wherein said transducer comprises a capacitor connected to a charging resistor and a discharging resistor, said first comparator comprising a magnetic amplifier having a first winding connected to said discharging resistor, a second winding connected to the input of said transducer through a feedback resistor, a third winding connected to said reference sigNal and an output winding, said charging and discharging resistors having different values.
References Cited (Backward Citations)
US3364406A
Cited
US3378743A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |