US4009914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alarm system for a skid control system
Assignee: Sharp Corp
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Filing: 1975-03-11
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Granted: 1977-03-01
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Expires: 1995-03-11
Abstract
Abstract In a skid control system for fluid actuated brakes of a wheeled vehicle, it is necessary to provide a fault detection unit for detecting a dangerous fault condition of the skid control system and disconnecting the skid control system from an electric source. There is also provided another fault detection unit for detecting a light fault condition of the skid control system and a fault condition of a power circuit during travel of the vehicle, and indicating the fault condition without disconnecting the skid control system from the electric source. The initial condition of the skid control system immediately after power throw is checked and the indication is carried out when the skid control system is in a normal condition, and the indication is eliminated when the velocity of the vehicle exceeds a predetermined value.
Inventors
- 👤 Takefumi Sato
- 👤 Yuji Dohi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:30
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/88; B60T8/885
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
143 words
In an alarm system for a wheeled vehicle including a power source, a skid control system for controlling brake pressure with the use of output signals from a wheel revolution sensor, a fuse for connecting the skid control system with the power source, and an indication unit, a combination comprising: a dangerous fault condition detection unit connected to receive output signals from the skid control system; a first switching means included within the dangerous fault condition detection unit for enabling the indication unit and tearing the fuse when the skid control system is placed in its dangerous fault condition; a negligible fault condition detection unit; and a second switching means included within the negligible fault condition detection unit for enabling the indication unit without tearing the fuse when the alarm system or the skid control system is placed in its slight fault condition.
Claim 2
Dependent Claim
143 words
In an alarm system for a wheeled vehicle including a power source, a skid control system for controlling brake pressure with the use of output signals from a wheel revolution sensor, a fuse for connecting the skid control system with the power source, and an indication unit, a combination comprising: a dangerous fault condition detection unit connected to receive output signals from the skid control system; a first switching means included within the dangerous fault condition detection unit for enabling the indication unit and tearing the fuse when the skid control system is placed in its dangerous fault condition; a negligible fault condition detection unit; and a second switching means included within the negligible fault condition detection unit for enabling the indication unit without tearing the fuse when the alarm system or the skid control system is placed in its slight fault condition.
Claim 3
Dependent Claim
167 words
In an alarm system for a wheeled vehicle including a power source, a skid control system for controlling brake pressure with the use of output signals from a wheel revolution sensor, and a fuse for connecting the skid control system with the power source a combination comprising: a series circuit of a first indication unit and a diode connected to the fuse in a parallel fashion; a first switching means connected between ground potential and a junction of the fuse and the diode; a second switching means connected between ground potential and a junction of the first indication unit and the diode; a dangerous fault condition detection unit connected to receive output signals from the skid control system in order to close the first switching means when the skid control system is placed in its dangerous fault condition; and a negligible fault condition detection unit for closing the second switching means when the alarm system or the skid control system is placed in the light fault condition.
Claim 4
Dependent Claim
167 words
In an alarm system for a wheeled vehicle including a power source, a skid control system for controlling brake pressure with the use of output signals from a wheel revolution sensor, and a fuse for connecting the skid control system with the power source a combination comprising: a series circuit of a first indication unit and a diode connected to the fuse in a parallel fashion; a first switching means connected between ground potential and a junction of the fuse and the diode; a second switching means connected between ground potential and a junction of the first indication unit and the diode; a dangerous fault condition detection unit connected to receive output signals from the skid control system in order to close the first switching means when the skid control system is placed in its dangerous fault condition; and a negligible fault condition detection unit for closing the second switching means when the alarm system or the skid control system is placed in the light fault condition.
Claim 5
Dependent Claim
21 words
The alarm system of claim 2 wherein the negligible fault condition detection unit detects the voltage output of the power source.
Claim 6
Dependent Claim
26 words
The alarm system of claim 2 wherein the dangerous fault condition detection unit is responsive to a pressure reduction signal generated from the skid control system.
Claim 7
Dependent Claim
41 words
The alarm system of claim 2 further comprising: a second indication unit connected to the fuse in a parallel fashion; and a trigger circuit connected to the fuse in a parallel fashion of which output signal triggers the first switching means.
Claim 8
Dependent Claim
24 words
The alarm system of claim 5 wherein the first indication unit is an alarm lamp and the second indication unit is an alarm buzzer.
Claim 9
Dependent Claim
22 words
The alarm system of claim 2 wherein the first switching means is an SCR and the second switching means is a transistor.
Claim 10
Dependent Claim
80 words
The alarm system of claim 2 further comprising: a third switch for connecting the fuse with the power source; a fourth switch for generating an initial check signal; an initial check circuit for closing the second switching means when the alarm system and the skid control system is placed in the normal condition upon generation of the initial check signal; a velocity detection circuit for opening the second switching means when the velocity of the vehicle exceeds a predetermined value.
Claim 11
Dependent Claim
18 words
The alarm system of claim 8 wherein the second switching means is opened upon closing the third switch.
Claim 12
Dependent Claim
17 words
The alarm system of claim 8 wherein the third switch is an ignition switch of the vehicle.
Claim 13
Dependent Claim
23 words
The alarm system of claim 8 wherein the fourth switch is a stop switch associated with a brake foot pedal of the vehicle.
Claim 14
Dependent Claim
21 words
The alarm system of claim 1 wherein the negligible fault condition detection unit detects the voltage output of the power source.
Claim 15
Dependent Claim
47 words
The alarm system of claim 1 wherein the skid control system includes an actuator unit active for reducing brake pressure, thereby preventing a locked condition of the wheels of said wheeled vehicle, and the negligible fault condition detection unit detects a temporary malfunction of said actuator unit.
Claim 16
Dependent Claim
27 words
The alarm system of claim 1 wherein the dangerous fault condition detection unit is responsive to an abnormal pressure reduction signal generated by the skid control system.
Claim 17
Dependent Claim
14 words
The alarm system of claim 1 wherein the first switching means is an SCR.
Claim 18
Dependent Claim
14 words
The alarm system of claim 1 wherein the second switching means is a transistor.
Claim 19
Dependent Claim
47 words
The alarm system of claim 2 wherein the skid control system includes an actuator unit active for reducing brake pressure, thereby preventing a locked condition of the wheels of said wheeled vehicle, and the negligible fault condition detection unit detects a temporary malfunction of said actuator unit.
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) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |