US3745522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monitoring systems and antiskid devices of vehicles
Assignee: Toyota Motor Corp
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Filing: 1970-10-16
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Granted: 1973-07-10
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Expires: 1990-10-16
Abstract
Abstract An antiskid device for a motor vehicle uses a cut-off valve provided with a switching element which, when the cutoff valve operates to isolate a master cylinder of the vehicle braking system from the wheel cylinders, is closed to supply voltage to a reference diode having a predetermined breakdown voltage. This breakdown voltage is reached only when the switching element is kept closed for a duration longer than a normal time interval at which the cutoff valve means operates. Prolonged operating periods of the cutoff valve means may expediently be exhibited by a pilot lamp. Another embodiment of the invention uses a sensing element and a control circuit and an associated monitoring signal generator capable of producing a monitoring signal of the same characteristics as the signal produced by the sensing element in the event of rapid deceleration of the vehicle wheels. The overall operation of the arrangement and circuit of the antiskid device can be checked while the vehicle is at rest.
Inventors
- 👤 M Inada
- 👤 A Hirai
- 👤 H Arai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:29
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/18; B60T17/22; B60T8/00; B60T8/17; B60T8/176; B60T8/1761; B60T8/17613; B60T8/32; B60T8/34; B60T8/42; B60T8/4208; B60T8/4225; B60T8/4241; B60T8/425; B60T8/88; B60T8/885; B60T8/92; B60T8/94
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
284 words
An antiskid control system for vehciles, comprising: a master cylinder for supplying pressure fluid for brakes of the vehicle; a wheel cylinder means for actuating the brake, said wheel cylinder means being connected to receive said pressure fluid; a passage means for connecting said master cylinder with said wheel cylinder; a sensor for detecting a revolving state of a wheel and for producing a signal of a predetermined shape; a controlled circuit means for detecting and signaling a degree of locking because of braking of said wheel, by an output signal sent from said sensor, and for producing an output indicating signal; a pressure regulating means connected in said passage means and operated by said indicating signal for regulating fluid pressure from the master cylinder to said wheel cylinder, said pressure regulating means including: a solenoid valve means responsive to and operated by said indicating signal, a cut-off valve means operated by said solenoid valve means and provided for controlling fluid communication between said master cylinder and said wheel cylinder means, a pressure reducing means also operated by said solenoid valve means and provided for reducing the braking fluid-pressure by increasing an effective volume of said passage means, said cut-off valve means including a valve member for cutting off fluid communication between said master cylinder and said wheel cylinder means, and a plunger for bringing said valve member to an open state; a switching means working between closed and open positions and operable directly by said cut-off valve means for energizing an indicating circuit; and an alarm means provided in said indicating circuit for forwarning an operation-disorder of said valve of said cut-off valve means in response to the operation of said switching means.
Claim 2
Dependent Claim
284 words
An antiskid control system for vehciles, comprising: a master cylinder for supplying pressure fluid for brakes of the vehicle; a wheel cylinder means for actuating the brake, said wheel cylinder means being connected to receive said pressure fluid; a passage means for connecting said master cylinder with said wheel cylinder; a sensor for detecting a revolving state of a wheel and for producing a signal of a predetermined shape; a controlled circuit means for detecting and signaling a degree of locking because of braking of said wheel, by an output signal sent from said sensor, and for producing an output indicating signal; a pressure regulating means connected in said passage means and operated by said indicating signal for regulating fluid pressure from the master cylinder to said wheel cylinder, said pressure regulating means including: a solenoid valve means responsive to and operated by said indicating signal, a cut-off valve means operated by said solenoid valve means and provided for controlling fluid communication between said master cylinder and said wheel cylinder means, a pressure reducing means also operated by said solenoid valve means and provided for reducing the braking fluid-pressure by increasing an effective volume of said passage means, said cut-off valve means including a valve member for cutting off fluid communication between said master cylinder and said wheel cylinder means, and a plunger for bringing said valve member to an open state; a switching means working between closed and open positions and operable directly by said cut-off valve means for energizing an indicating circuit; and an alarm means provided in said indicating circuit for forwarning an operation-disorder of said valve of said cut-off valve means in response to the operation of said switching means.
Claim 3
Dependent Claim
37 words
The antiskid control system for vehicles, as claimed in claim 1, in which said switching means comprises a pair of spaced stationary contacts and a movable contact disposed therebetween and selectively contacting either of said stationary contacts.
Claim 4
Dependent Claim
54 words
The antiskid control system for vehicles, as claimed in claim 1, in which said cut-off valve means comprises a rod being actuated in association with said plunger, and wherein, said switching means comprises a movable contact provided on said rod and a stationary contact means provided on the body of said cut-off valve means.
Claim 5
Dependent Claim
65 words
The antiskid control system for vehicles, as claimed in claim 1, which further includes a checking meaNs comprising a monitoring signal generator means for supplying a signal having a shape similar to said predetermined shape so as to simulate a substantially locked state of said vehicle wheel so as to test the soundness of operation of the antiskid system when the vehicle is at standstill.
Claim 6
Dependent Claim
68 words
The antiskid control system for vehicles, as claimed in claim 1, in which said alarm means comprises a braking alarm circuit, said braking alarm circuit including an indication lamp means responsive to said switching means for indicating that the braking pressure is produced normally, said switching means being responsive to the operation of said plunger in said cut-off valve means and being electrically connected with said indication lamp.
Claim 7
Dependent Claim
108 words
The antiskid control system for vehicles, as claimed in claim 5, in which said braking alarm circuit further comprises a second normally-open switching means operating in association with a hand braking lever of the vehicle, a third normally-open switching means operating in association with a brake pedal of the vehicle, and a fourth normally-open switching means operating in association with an engine switch of the vehicle, whereby, in said first position of said switching means, by way of lighting of said indication lamp, there is given an indication as to whether or not normal braking pressure is produced before releasing the hand brake and pressing the brake pedal.
Claim 8
Dependent Claim
72 words
The antiskid control system for vehicles, as claimed in claim 1, in which said cut-off valve means comprises two chambers partitioned by a first diaphragm and a rod secured thereto and operated in association with said plunger, and in which said pressure reducing means comprises two chambers partitioned by a second diaphragm and a second plunger attached thereto, for controlling said effective volume in response to the operation of said second diaphragm.
Claim 9
Dependent Claim
100 words
The antiskid control system for vehicles, as claimed in claim 1, in which said alarm means comprises: an electrical supply input point; an alarm device; an RC circuit having a known time-constant characteristic connected to said input point so as to allow electrical potential at said input point to increase at a known rate with time; and a means connected to said input point to establish electrical supply therethrough from said input point to said alarm device when the electrical potential at said input point rises above a predetermined level corresponding to a known time lag on said time-constant characteristic.
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |